Power Control Description(2008!03!20)

RAN

Power Control Description

Issue Draft

Date 2008-03-20

Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd

Huawei Technologies Co., Ltd. provides customers with comprehensive technical support and service. For anyassistance, please contact our local office or company headquarters.

Huawei Technologies Co., Ltd.Address: Huawei Industrial Base

Bantian, LonggangShenzhen 518129People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

Copyright © Huawei Technologies Co., Ltd. 2008. All rights reserved.No part of this document may be reproduced or transmitted in any form or by any means without prior writtenconsent of Huawei Technologies Co., Ltd. Trademarks and Permissions

and other Huawei trademarks are the property of Huawei Technologies Co., Ltd.All other trademarks and trade names mentioned in this document are the property of their respective holders. NoticeThe information in this document is subject to change without notice. Every effort has been made in thepreparation of this document to ensure accuracy of the contents, but the statements, information, andrecommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd

http://www.huawei.com

mailto:[email protected]

Contents

About This Document.....................................................................................................................1

1 Power Control Change History...............................................................................................1-1

2 Power Control Overview..........................................................................................................2-12.1 Power Control Introduction.............................................................................................................................2-22.2 Supported Software Versions for Power Control............................................................................................2-3

3 Power Control Technical Description....................................................................................3-13.1 Power Control on Common Channels, DPCHs and F-DPCHs.......................................................................3-2

3.1.1 Open-Loop Power Control ....................................................................................................................3-23.1.2 Inner-Loop Power Control...................................................................................................................3-373.1.3 Outer-Loop Power Control...................................................................................................................3-583.1.4 Downlink Power Balancing.................................................................................................................3-71

3.2 HSDPA Power Control.................................................................................................................................3-773.2.1 Power Control of HS-DPCCH.............................................................................................................3-773.2.2 Power Control of HS-SCCH................................................................................................................3-87

3.3 HSUPA Power Control.................................................................................................................................3-903.3.1 Power Control on E-DPCCH ..............................................................................................................3-903.3.2 Power Control on E-DPDCH...............................................................................................................3-913.3.3 E-DCH Outer-Loop Power Control.....................................................................................................3-963.3.4 Downlink Power Control on E-AGCH, E-RGCH, and E-HICH ......................................................3-108

3.4 Power Control Parameters...........................................................................................................................3-123

4 Implementing Power Control..................................................................................................4-1

5 Power Control Reference Documents....................................................................................5-1

RANPower Control Description Contents

Issue Draft (2008-03-20) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd

i

Figures

Figure 3-1 Uplink open-loop power control on PRACH.....................................................................................3-4Figure 3-2 Uplink open-loop power control on DPCCH...................................................................................3-15Figure 3-3 Downlink open-loop power control on the DPDCH........................................................................3-29Figure 3-4 Uplink outer-loop power control......................................................................................................3-60Figure 3-5 Downlink power balancing...............................................................................................................3-72Figure 3-6 Power control on HS-DPCCH..........................................................................................................3-78Figure 3-7 Preamble and postamble of HS-DPCCH..........................................................................................3-79Figure 3-8 Power offset between E-DPCCH and uplink DPCCH.....................................................................3-90Figure 3-9 Power offset between E-DPDCH and uplink DPCCH.....................................................................3-92Figure 3-10 General procedure for outer-loop power control on E-DCH for a single service..........................3-97Figure 3-11 Calculate the delta SIR of E-DCH..................................................................................................3-98Figure 3-12 Procedure for HSDPA-based power control on E-AGCH...........................................................3-120

RANPower Control Description Figures


iii

Tables

Table 1-1 Document and product versions...........................................................................................................1-1Table 2-1 NEs involved in power control............................................................................................................2-3Table 3-1 Upper and lower limits of downlink DPDCH power for some typical services................................3-32Table 3-2 Calculating ΔRESUME in different ITP modes....................................................................................3-44

Table 3-3 Uplink parameter configuration in compressed mode.......................................................................3-47Table 3-4 Comparison between uplink inner-loop power control in normal and compressed modes...............3-48Table 3-5 Downlink parameter configuration in compressed mode..................................................................3-57Table 3-6 Comparison between downlink inner-loop power control in normal and compressed modes..........3-58Table 3-7 Parameters of BLER-based outer-loop power control on RAB basis................................................3-66Table 3-8 Parameters of BER-based outer-loop power control on RAB basis..................................................3-70Table 3-9 Quantization for βed,k,j,uq/βc................................................................................................................3-93

Table 3-10 Demodulation requirements for E-HICH.......................................................................................3-108Table 3-11 Demodulation requirements for E-RGCH.....................................................................................3-108Table 3-12 Soft combination on the UE side...................................................................................................3-114Table 3-13 SlotNum values for 2 ms and 10 ms TTI.......................................................................................3-115Table 3-14 Parameters related to power control...............................................................................................3-123

RANPower Control Description Tables


v

About This Document

RANPower Control Description About This Document


1

1 Power Control Change History

Power Control Change History provides information on the changes between different documentversions.

Document and Product Versions

Table 1-1 Document and product versions

DocumentVersion

RAN Version RNC Version NodeB Version

Draft(2008-03-20)

10.0 V200R010C01B050 V100R010C01B045

There are two types of changes, which are defined as follows:

l Feature change: refers to the change in the transmission resource management feature of aspecific product version.

l Editorial change: refers to changes in information that has already been included, or theaddition of information that was not provided in the previous version.

Draft (2008-03-20)

This is the draft of the document for first commercial release of RAN10.0.

Compared with issue 03 (2008-01-20) of RAN6.1, this issue incorporates the changes describedin the following table.

ChangeType

Change Description Parameter Change

Featurechange

The default value of the Max allowed UE ULTX power parameter has changed.

Max allowed UE UL TXpower

Featurechange

The default value of the Constant valueconfigured by default parameter has changed.

Constant value configuredby default

RANPower Control Description 1 Power Control Change History


1-1

ChangeType


Featurechange

The default value of the HHO Proc DPCCHPC preamble length parameter has changed.

HHO Proc DPCCH PCpreamble length

1 Power Control Change HistoryRAN


1-2 Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd

Issue Draft (2008-03-20)

ChangeType


Editorialchange

Information on HSDPA and HSUPA PowerControl has been moved from the featuredescriptions for those features and added to thisfeature description. For detailed information,see 3.2 HSDPA Power Control and 3.3HSUPA Power Control.

The following parametershave been moved to thisfeature description:l ACK poweroffset1

l ACK poweroffset2

l ACK poweroffset3

l ACK poweroffset1multi-RLS



l NACK poweroffset1

l NACK poweroffset2

l NACK poweroffset3

l NACK poweroffset1multi-RLS



l CQI Power Offset

l CQI Power Offset multi-RLS

l ACK-NACK RepetitionFactor 1



l ACK-NACK RepetitionFactor multi-RLS

l CQI Repetition Factor

l CQI Repetition Factormulti-RLS

l CQI Feedback Cycle k

l CQI Feedback Cycle kmulti-RLS

l HS-SCCH PowerControl Method

l HS-SCCH Power



1-3

ChangeType


l HS-SCCH FER (‰)

l E-DPCCH power offset

l Reference E-TFCI Index

l Reference E-TFCIPower Offset

l Switch to selectAlgorithm

l Target of E-DCHresidual BLER

l Maximum E-DCH SIRincrease step

l Maximum E-DCH SIRdecrease step

l E-DCH SIR decreasestep

l Target Number of E-DCH PDU retransfer

l Maximum Number of E-DCH PDU retransfer

l E-DCH Power offsetdecrease step

l Maximum E-DCHPower offset increasestep

l Maximum E-DCHPower offset decreasestep

l E-DCH Power OffsetPeriod

l Maximum E-DCHPower Offset

l Minimum E-DCHPower Offset

l E-AGCH HPC Mode

l E-RGCH HPC Mode forService Radio Link Set

l E-RGCH HPC Mode forNon-service Radio Links

l E-HICH HPC Mode forService Radio Link Set

l E-HICH HPC Mode forNon-service Radio LinkSet

1 Power Control Change HistoryRAN




ChangeType


l E-AGCH Power

l E-RGCH Power forService Radio Link Set

l E-RGCH Power forNon-service Radio Links

l E-HICH Power forSingle Radio Link Set

l E-HICH Power forService Radio Link Set

l E-HICH Power for Non-service Radio Link Set

l E-AGCH Power Offset

l E-RGCH Power Offsetfor Service Radio LinkSet

l E-RGCH Power Offsetfor Non-service RadioLinks

l E-HICH Power Offsetfor Single Radio Link Set

l E-HICH Power Offsetfor Service Radio LinkSet

l E-HICH Power Offsetfor Non-service RadioLink Set

l E-AGCH Max Power

l E-AGCH Min Power

Editorialchange

General documentation change:Implementation information has been moved toa separate document. For information on how toimplement Power Control, see ConfiguringPower Control in RAN FeatureConfiguration Guide.

Editorialchange

Information on counters has been removed.



1-5

2 Power Control Overview

About This Chapter

Power Control Overview introduces the power control feature, and describes the networkelements involved, and software releases.

2.1 Power Control IntroductionThe WCDMA system is a self-interfering system and the most important way to restrain systeminterference is power control. The power control is performed by the UE or UTRAN to adjustand control the power of transmitting signals according to changes of the channel environmentand quality of received signals. The uplink and downlink power is adjusted to a minimum whileensuring Quality of Service (QoS).

2.2 Supported Software Versions for Power ControlSupported Software Releases provides information on the software environments where thisfeature is supported.

RANPower Control Description 2 Power Control Overview


2-1

2.1 Power Control IntroductionThe WCDMA system is a self-interfering system and the most important way to restrain systeminterference is power control. The power control is performed by the UE or UTRAN to adjustand control the power of transmitting signals according to changes of the channel environmentand quality of received signals. The uplink and downlink power is adjusted to a minimum whileensuring Quality of Service (QoS).

Uplink and Downlink Power Control

The main purposes of power control in the uplink are to decrease interference to other UEs andto save UE transmission power. The main purposes of power control in the downlink are todecrease interference to other cells and to save NodeB transmission power. The following listdescribes some scenarios when power control is needed:

l In the uplink, if a UE near the NodeB has too high transmit power, it may cause greatinterference to other UEs on the edge of the cell or even block the whole cell. This is callednear-far effect. In this case, uplink power control is needed.

l In the downlink, the system capacity is determined by the total of code power required foreach connection. Therefore, it is necessary to keep the transmit power at the lowest levelwhile ensuring signal quality at the UE. In this case, downlink power control is needed.

Power control is also used to avoid shadow and fast fading as well as power drift. By usingpower control to avoid power drift, soft handover performance in the downlink is improved.

Power Control Types

Apart from uplink power control and downlink power control, the power control can be dividedinto the following:

l Open-loop power controlIn open-loop power control, the initial transmission power is decided. The UE estimatesthe power loss of signals on the propagation path by measuring the downlink channel signalsand then the UE calculates the initial transmission power of the uplink channel. This methodis rather rough and it is only applied at the beginning of a connection setup. Open-looppower control is applied on physical channels such as PRACH and DPCH.

l Closed-loop power controlClosed-loop power control is used to calculate the transmission power after the initialtransmission power has been decided. During a transmission, the path loss and interferenceestimated by the downlink cannot completely reflect the path loss and interference in theuplink because of the frequency interval between the downlink and uplink. This problemcan be solved by using closed-loop power control; the transmission power is controlleddynamically and quickly according to feedback from the controller.Closed-loop power control is divided into the following:– Inner-loop power control

Inner-loop power control directly adjusts the uplink and downlink transmission powerby using power control commands.

– Outer-loop power controlOuter-loop power control indirectly adjusts the uplink and downlink transmission powerby increasing or decreasing target SIR values.

2 Power Control OverviewRAN




l Downlink power balancingDownlink power balancing is a power control method that is used to reduce the downlinkpower drift of a given UE during soft handover.

For the HSDPA and HSUPA features, the power control types and algorithms are different. Fordetailed information, see 3.2 HSDPA Power Control and 3.3 HSUPA Power Control.

ImpactImpact on System Performance

Power control improves the system capacity and ensures the QoS.

Impact on Other Features

This feature has no impact on other features.

Network Element InvolvedTable 2-1 shows the Network Elements (NEs) involved in Power Control.

Table 2-1 NEs involved in power control

UE NodeB RNC MSCServer

MGW SGSN GGSN HLR

√ √ √ – – – – –

NOTE

l –: not involved

l √: involved

UE = User Equipment, RNC = Radio Network Controller, MSC Server = Mobile Service Switching CenterServer, MGW = Media Gateway, SGSN = Serving GPRS Support Node, GGSN = Gateway GPRS SupportNode, HLR = Home Location Register

2.2 Supported Software Versions for Power ControlSupported Software Releases provides information on the software environments where thisfeature is supported.

Product Version

RNC BSC6800 V100R002 and later releases

BSC6810 V200R009 and later releases

NodeB DBS3800 V100R006 and later releases

BTS3812A V100R002 and later releases

BTS3812E

iDBS3800 V100R008 and later releases

RANPower Control Description 2 Power Control Overview


2-3

Product Version

BTS3812AE

2 Power Control OverviewRAN




3 Power Control Technical Description

About This Chapter

Power Control Technical Description covers the technical aspects of the feature, including theparameters, key principles, and algorithms.

3.1 Power Control on Common Channels, DPCHs and F-DPCHsPower control on common channels, Dedicated Physical Channels (DPCHs), and FractionalDPCHs (F-DPCHs) can be open- or closed-loop power control, or downlink power balancing.Closed-loop power control is divided into inner- and outer-loop power control.

3.2 HSDPA Power ControlHSDPA Power Control describes the power control of HSDPA on physical channels, includingHS-DPCCH, and HS-SCCH.

3.3 HSUPA Power ControlHSUPA Power Control describes the power control of HSUPA physical channels including E-DPCCH, E-DPDCH, E-AGCH, E-RGCH, and E-HICH.

3.4 Power Control ParametersPower Control Parameters provides information on the effective level and configuration of theparameters related to the feature.

RANPower Control Description 3 Power Control Technical Description


3-1

3.1 Power Control on Common Channels, DPCHs and F-DPCHs

Power control on common channels, Dedicated Physical Channels (DPCHs), and FractionalDPCHs (F-DPCHs) can be open- or closed-loop power control, or downlink power balancing.Closed-loop power control is divided into inner- and outer-loop power control.

3.1.1 Open-Loop Power ControlBased on the measurement of received downlink signal power, open-loop power control attemptsto make a rough estimation of the path loss and then to provide coarse initial power settings forthe UE and NodeB.

3.1.2 Inner-Loop Power ControlInner-loop power control is also called fast closed-loop power control. It controls the transmitpower according to the information returned from the peer physical layer. The UE and the NodeBcan adjust the transmit power according to the SIR from the peer end, to compensate for thefading of radio links.

3.1.3 Outer-Loop Power ControlThe outer-loop power control is a part of the closed-loop power control and the aim of outer-loop power control is to maintain the communication quality at the level required by the servicebearer through adjustment of the SIR target. This power control acts on each DCH belonging tothe same RRC connection.

3.1.4 Downlink Power BalancingDownlink power balancing is used to reduce power drift between downlink radio links in softor softer handover.

3.1.1 Open-Loop Power ControlBased on the measurement of received downlink signal power, open-loop power control attemptsto make a rough estimation of the path loss and then to provide coarse initial power settings forthe UE and NodeB.

3.1.1.1 Uplink Open-Loop Power Control on PRACHThe Physical Random Access Channel (PRACH) is the only common channel on which theuplink open-loop power control is applied.

3.1.1.2 Uplink Open-Loop Power Control on DCHThe uplink open-loop power control on Dedicated Channel (DCH) aims to determine the initialpower of the first uplink Dedicated Physical Control Channel (DPCCH).

3.1.1.3 Downlink Open-Loop Power Control on Common ChannelsDownlink open-loop power control is used to determine how much power to allocate to downlinkcommon channels.

3.1.1.4 Downlink Open-Loop Power Control on DCHDownlink open-loop power control on DCH is used to determine the DPDCH transmit powerbased on the measured results of RACH IE from the UE.

3.1.1.5 Downlink Open-Loop Power Control on F-DPCH

3 Power Control Technical DescriptionRAN




Downlink Open-Loop Power Control on F-DPCH describes how to calculate the initial transmitpower of the downlink Fractional Dedicated Physical Channel (F-DPCH) and the limits of theF-DPCH power.

Uplink Open-Loop Power Control on PRACHThe Physical Random Access Channel (PRACH) is the only common channel on which theuplink open-loop power control is applied.

Procedure for Uplink Open-Loop Power Control on PRACHThe information sent by the UE during a PRACH random access procedure is comprised of twoparts: preamble part, and message part. During the procedure, first, the preamble part istransmitted and when the preamble part has been received properly, the message part istransmitted. The procedure for power control of the UE access on the PRACH is the following:

1. The UE acquires the System Information Block (SIB) from the NodeB. The SIB includesthe parameter values "Primary CPICH Tx power", "UL interference", and "Constant value".

2. The UE calculates the initial power for the first preamble.3. The UE transmits the first preamble to the NodeB.4. Depending on the result of the transmission:

l If no acquisition indicator is received, the UE increases the power for the preamble andretransmits the preamble.

l If a negative acquisition indicator is received, the UE exits the random access procedure,waits for a specified time, and then reinitiates the random access procedure.

l If a positive acquisition indicator is received, the UE exits the random access procedure,sets the power for the message part, and transmits the message part.

The power used to send the preamble part and message part can never exceed the maximumallowed uplink transmit power.

The preamble part consists of several preambles, has a length of 4,096 chips, and consists of256 repetitions of a signature that is 16 chips long. There are a maximum of 16 signaturesavailable. The message part is 10 ms or 20 ms long and is comprised of a control part and a datapart. The data and control parts are transmitted in parallel.

Calculating the Initial Power for the First Preamble PartTo determine the initial power of the UE on its first PRACH preamble transmission, both UEand NodeB are involved, as shown in Figure 3-1.



3-3

Figure 3-1 Uplink open-loop power control on PRACH

The UE measures the CPICH_RSCP value and calculates the initial power for the first preamblewith the following formula:

Preamble_Initial_Power = PCPICH transmit power – CPICH_RSCP + UL interference +Constant value for calculating initial TX power

where:

l The PCPICH transmit power parameter defines the P-CPICH transmit power in a cell.It is broadcast in SIB 5.

l CPICH_RSCP is the received signal code power of P-CPICH. It is an average power of thereceived signal on the P-CPICH measured by the UE.

l UL interference is the uplink Received Total Wideband Power (RTWP) measured by theNodeB within the bandwidth defined by the receiver pulse shaping filter. Such influenceincludes the noise generated in the receiver. This value is broadcast in SIB 7.

l The Constant value for calculating initial TX power parameter compensates for theRACH processing gain. It is broadcast in SIB 5.

The parameters used in the formula are described in the following tables:

Parameter Name PCPICH transmit power

Parameter ID PCPICHPOWER

GUI Range –100 to 500

Physical Range & Unit–10 to 50Step: 0.1Unit: dBm

Default Value 330

Optional/Mandatory Optional





MML Command ADD PCPICH/ADD QUICKCELLSETUP/MOD CELL

Description This parameter must be set based on the actual systemenvironment such as cell coverage (radius), and geographicalenvironment.For the cells to be covered, the downlink coverage must beguaranteed as a premise.For cells involved in soft handover, this parameter must be setappropriately to ensure that the soft handover areas aredistributed in the cells as stipulated in the network planning.If the maximum transmit power of the P-CPICH value is toohigh, the cell capacity will decrease because many systemresources will be occupied, and the interference in the downlinktraffic channels will increase.

Recommendation

P-CPICH transmit power is related to the downlink coverage defined during networkplanning. The default setting is 330, that is, 33 dBm.l If the value of this parameter is too small, it will directly influence the downlink pilot

coverage range.l If it is too large, the downlink interference will increase, and the transmit power that can

be distributed to the services will be reduced, which will affect the downlink capacity.In addition, the configuration of this parameter has influence on the distribution of handoverareas.

Parameter Name Constant value for calculating initial TX power

Parameter ID CONSTANTVALUE

GUI Range –35 to –10

Physical Range & Unit dB

Default Value –20


MML Command ADD PRACHBASIC/MOD PRACHUUPARAS

Description This parameter is used to calculate the transmit power of the firstpreamble in the random access procedure.

Increasing the Power and Retransmitting the PreambleAfter transmitting the first preamble, if no acquisition indicator on AICH is received by the UEwithin the period defined by the AICH transmission timing parameter, a ramp procedure starts.



3-5

During the ramp procedure, the UE increases the preamble power by the value defined by thePower increase step parameter and retransmits the preamble.

The related parameters are as follows:

l The AICH transmission timing parameter defines the waiting time between twoconsecutive preambles. To avoid collisions, the 3GPP standard specifies that the UE mustwait at least 3 or 4 access timeslots between the transmissions. The processing capabilityof the NodeB is also taken into consideration when defining the waiting time.

l The Power increase step parameter defines how much the transmit power is increasedeach time the UE retransmits a preamble.

l The Max preamble retransmission and Max preamble loop parameters define themaximum number of transmitted preambles.– The Max preamble retransmission parameter specifies the maximum number of

preambles transmitted in a preamble ramping cycle.Assume that the number of preamble retransmissions is n. Then, a preamble rampingcycle is defined as the length of radio frames on which the n preambles are transmittedover specific access timeslots. Therefore, the preamble retransmission cycle is variable.

– Max preamble loop specifies the maximum number of preamble ramping cycles.

If no acquisition indicator is received by the UE, the ramp procedure will stop when the numberof transmitted preambles reaches the value of Max preamble retransmission within a preambleramping cycle, or when the maximum number of preamble ramping cycles reaches the value ofMax preamble loop.

The parameters used in the ramp procedure are described in the following tables:

Parameter Name AICH transmission timing

Parameter ID AICHTXTIMING

GUI Range 0, 1

Physical Range & Unit None

Default Value 1


MML Command ADD AICH

Description This parameter indicates the transmission timing information ofan AICH.l The value 0 indicates that there are 7,680 chips offset between

the access preamble of the PRACH and AICH.l The value 1 indicates that there are 12,800 chips offset between

them.

CAUTIONTo change the value of the AICH transmission timing parameter, the cell must first bedeactivated through DEA CELL.





Parameter Name Power increase step

Parameter ID POWERRAMPSTEP

GUI Range 1 to 8


Default Value 2



Description This parameter specifies the power increase step of the randomaccess preambles transmitted before the UE receives theacquisition indicator in the random access procedure.

Recommendation

If the value of Power increase step is too large, the access procedure will be shortened, butit is more likely to cause power waste. If it is too small, the access procedure will belengthened, but transmit power will be saved. This parameter must be set carefully.

Parameter Name Max preamble retransmission

Parameter ID PREAMBLERETRANSMAX

GUI Range 1 to 64


Default Value 20



Description This parameter specifies the maximum number of preamblestransmitted in a preamble ramping cycle.

Recommendation

The product of Max preamble retransmission and Power increase step determines themaximum power ramping of the UE within a preamble ramping cycle.If the value of Max preamble retransmission is too small, the preamble power may fail toramp to the required value, this may result in UE access failure. If it is too large, the UE willrepeatedly increase the power and make access attempts, which may result in interference toother UEs.



3-7

Parameter Name Max preamble loop

Parameter ID MMAX

GUI Range 1 to 32


Default Value 8


MML Command ADD RACH/MOD RACH

Description This parameter specifies the maximum number of random accesspreamble ramping cycles.

CAUTIONTo change the value of the Max preamble loop parameter, if the current cell is active and thereis only one PRACH in this cell, the cell must be firstly deactivated through DEA CELL.

Reinitiating the Random Access Procedure

If the UE receives a negative acquisition indicator on AICH, the UE waits for a certain period,this period is called the back-off delay, and then reinitiates the random access procedure. Theparameters Random back-off lower limit and Random back-off upper limit define the lowerand upper limits of the back-off delay.

Parameter Name Random back-off lower limit

Parameter ID NB01MIN

GUI Range 0 to 50

Physical Range & Unit Frame

Default Value 0



Description This parameter specifies the lower limit of the random accessback-off delay.

Parameter Name Random back-off upper limit

Parameter ID NB01MAX





GUI Range 0 to 50


Default Value 0



Description This parameter specifies the upper limit of the random accessback-off delay.

Configuration Rule and Restriction

The value of Random back-off lower limit cannot be greater than that of Random back-offupper limit.If the value of Random back-off lower limit is equal to that of Random back-off upperlimit, it means that the retransmission period of the preamble part is fixed.

CAUTIONTo change the value of Random back-off lower limit or Random back-off upper limit, if thecurrent cell is active and there is only one PRACH in this cell, the cell must first be deactivatedthrough the DEA CELL command.

Setting the Power of and Transmitting the Message Part

If the UE receives a positive acquisition indicator on AICH, the UE exits the random accessprocedure, sets the transmit power of the message part, and transmits the message part.

The message part consists of two parts: the control part and the data part. The power of thecontrol part is the same as the power of the last transmitted preamble plus a value defined bythe Power offset parameter.

The Power offset parameter is described in the following table:

Parameter Name Power offset

Parameter ID POWEROFFSETPPM



Default Value Values according to PRACH TFC

Optional/Mandatory Mandatory



3-9

MML Command ADD PRACHTFC

Description This parameter specifies the power offset between the lastaccess preamble and the message control part. The power ofthe message control part can be obtained by adding the offsetto the access preamble power.


Power offset must be set for each instance of PRACH TFC.

Recommendation

It is recommended that the value of Power offset be set to –3 dB corresponding to the TFCfor signaling transmission and be set to –2 dB corresponding to the TFC for servicetransmission.If the value of Power offset is set too small, it is likely that the signaling or the service datacarried over the RACH cannot be correctly received, which affects the uplink coverage. If thevalue is set too large, the uplink interference is increased, and the uplink capacity is affected.

CAUTIONTo change the value of Power offset, if the current cell is active and there is only one PRACHin this cell, the cell must first be deactivated through DEA CELL.

The power of the data part is calculated with the following formula:

Pdata = Pcontrol x (βd/βc)2

where:

l Pcontrol is the power for the control part.

l βd is the power gain factor for the data part. The value is defined by the Gain FactorBetaD parameter.

l βc is the power gain factor for the control part. The value is defined by the Gain FactorBetaC parameter.

The power gain factor parameters are described in the following tables:

Parameter Name Gain Factor BetaC

Parameter ID GAINFACTORBETAC

GUI Range 1 to 15






Default Value None



Description This parameter specifies the power gain factor of the controlpart.

Parameter Name Gain Factor BetaD

Parameter ID GAINFACTORBETAD

GUI Range 0 to 15


Default Value None



Description This parameter specifies the power gain factor of the data part.

PRACH CTFC Power Offset Gain Factor BetaC Gain Factor BetaD

0 –3 13 15

1 –2 10 15


Either the Gain Factor BetaC or the Gain Factor BetaD parameter must be set to 15 foreach instance of power difference between control and data part of PRACH.

CAUTIONTo change the value of Gain Factor BetaC or Gain Factor BetaD, if the current cell is activeand there is only one PRACH in this cell, the cell must first be deactivated through DEACELL.

After the power is set for the message part, the message part is transmitted in the timeslot thatis three or four uplink access timeslots after the uplink access timeslot of the last transmitted



3-11

preamble. The time period to transmit the message part is defined by the AICH transmissiontiming parameter.

Maximum Allowed Uplink Transmit Power

The maximum allowed uplink transmit power defines the total output power allowed for the UEwhen it tries to access a specific cell. That is, the transmit power on the PRACH for the preambleand message parts cannot be greater than this value. This value is different for different servicetypes.

The Max allowed UE UL TX power parameter defines the maximum allowed uplink transmitpower and the parameter is described in the following table:

Parameter Name Max allowed UE UL TX power

Parameter ID MAXALLOWEDULTXPOWER


Physical Range & Unit dBm

Default Value 24


MML Command ADD CELLSELRESEL/MOD CELLSELRESEL

Description This parameter specifies the maximum allowed uplinktransmit power of RACH of a UE in the cell, which is relatedto network planning.


If the value of Max allowed UE UL TX power is greater than the UE capability, the maximumtransmit power is limited by the UE capability.

The following parameters are used to define the maximum uplink transmit power for differentservice types:

l Max UL TX power of conversational service

l Max UL TX power of streaming service

l Max UL TX power of interactive service

l Max UL TX power of background service

The parameters are described in the following tables:

Parameter Name Max UL TX power of conversational service

Parameter ID MAXULTXPOWERFORCONV







Default Value 24


MML Command ADD CELLCAC/MOD CELLCAC

Description This parameter specifies the maximum UL transmit power forconversational services in a specific cell. It is based on the ULcoverage requirement of the conversational services designedby the network planning.

Parameter Name Max UL TX power of streaming service

Parameter ID MAXULTXPOWERFORSTR



Default Value 24



Description This parameter specifies the maximum UL transmit power forstreaming services in a specific cell. It is based on the ULcoverage requirement of the streaming services designed bythe network planning.

Parameter Name Max UL TX power of interactive service

Parameter ID MAXULTXPOWERFORINT



Default Value 24



Description This parameter specifies the maximum UL transmit power forinteractive services in a specific cell. It is based on the ULcoverage requirement of the interactive services designed bythe network planning.



3-13

Parameter Name Max UL TX power of background service

Parameter ID MAXULTXPOWERFORBAC



Default Value 24



Description This parameter specifies the maximum UL transmit power forbackground services in a specific cell. It is based on the ULcoverage requirement of the background services designed bythe network planning.

Recommendation

The larger the values of these parameters are, the wider the coverage of the correspondingservices will be. When the downlink coverage is exceeded, the uplink coverage and downlinkcoverage of the service will become unbalanced. If the values of these parameters are toosmall, the uplink coverage will probably be smaller than the downlink coverage of the service.If there is no special requirement, use the default values.

Uplink Open-Loop Power Control on DCHThe uplink open-loop power control on Dedicated Channel (DCH) aims to determine the initialpower of the first uplink Dedicated Physical Control Channel (DPCCH).

Procedure for Uplink Open-Loop Power Control on DPCCHThe procedure for determining the initial power of the first uplink DPCCH is as follows:

1. The UE acquires the SIB from the NodeB. The SIB includes DPCCH power offset, βd/βc , and rate matching attribute.

2. The UE measures the CPICH_RSCP value and calculates the initial power and power offsetbetween DPDCH and DPCCH.

3. The UE transmits data on the DPCCH and DPDCH with power specified by the initialDPCCH power and power offset.

Figure 3-2 describes the elements involved in the procedure.





Figure 3-2 Uplink open-loop power control on DPCCH

Calculating Initial Power and Power OffsetAfter acquiring the SIB from the NodeB, the UE measures the CPICH_RSCP value andcalculates the initial power with the following formula:

DPCCH_Initial_Power = DPCCH_Power_Offset – CPICH_RSCP

where:

l DPCCH_Initial_Power is the initial power.

l DPCCH_Power_Offset is provided by the RNC, and sent to the UE through the uplinkDPCH power control information element (IE) in Radio Resource Control (RRC) signaling.The IE is included in the RRC messages for the following procedures:– Radio bearer setup

– Radio bearer reconfiguration

– Radio bearer release

– Transport channel reconfiguration

– Physical channel reconfiguration

– RRC connection setup

– RRC connection re-establishment

l CPICH_RSCP is the received signal code power of P-CPICH. The power value is anaverage power value of the received signal on the P-CPICH measured by the UE.

The power offset for the DPCCH is calculated by the RNC with the following formula:

DPCCH_Power_Offset = PCPICH transmit power + Uplink interference + Constant valueconfigured by default

where:



3-15

l DPCCH_Power_Offset is the power offset for the DPCCH.

l The PCPICH transmit power parameter defines the P-CPICH transmit power in a cell.This value is broadcast in SIB 5. For detailed information on the parameter, see 3.1.1.1Uplink Open-Loop Power Control on PRACH.

l Uplink interference is the uplink RTWP measured by the NodeB within the bandwidthdefined by the receiver pulse shaping filter. Such interference includes noise generated inthe receiver. This value is broadcast in SIB 7.

l The Constant value configured by default parameter reflects the target Ec/No of theuplink DPCCH. Ec is the energy of a signal physical chip and No is the noise energy. Theparameter is described in the following table:

Parameter Name Constant value configured by default

Parameter ID DEFAULTCONSTANTVALUE

GUI Range –35 to –10


Default Value –22


MML Command SET FRC

Description This parameter is used by the RNC to calculate theDPCCH power offset, which is used by the UE tocalculate the initial transmit power of uplink DPCCHduring the open-loop power control procedure.

Power Difference Between DPCCH and DPDCH

The uplink DPCCH and DPDCHs are transmitted on different channel codes. To meet a givenQoS requirement on the transport channels, power differences between DPCCH and DPDCHare used for different transport formats. The power differences are obtained by dividing theuplink gain factor for the data part, βd, with the uplink gain factor for the control part, βc.

There are two ways of controlling the uplink gain factors of the DPCCH code and the DPDCHcodes for different Transport Format Combinations (TFCs) in normal (non-compressed) frames:

l βc and βd are signaled for the TFC.

l βc and βd are calculated for the TFC, based on the signal settings for a reference TFC.

According to 3GPP, a combination of these two methods can be used to associate βc and βdvalues with all TFCs in the TFC set (TFCS). These two methods are described in subsectionsTS 25.214. Several reference TFCs can be signaled from higher layers.

The RNC calculates a new power offset for each TFC dynamically and signals the power offsetto the UE. To calculate the power offset, the RNC uses a single set of configurable referencevalues that are defined by the Reference BetaC and Reference BetaD parameters. Theparameter values are stored for each predefined Radio Access Bearer (RAB) or Signaling RadioBearer (SRB). The Reference BetaC and Reference BetaD parameters are described in thefollowing tables:





Parameter Name Reference BetaC

Parameter ID BETAC

GUI Range 1 to 15


Default Value Values according to SRB and RAB


MML Command ADD TYPSRBBASIC/MOD TYPSRB/ADDTYPRABBASIC/MOD TYPRABBASIC

Description This parameter specifies the power occupancy of the controlpart of reference TFC.

Parameter Name Reference BetaD

Parameter ID BETAD

GUI Range 1 to 15


Default Value Values according to SRB and RAB


MML Command ADD TYPSRBBASIC/MOD TYPSRB/ADDTYPRABBASIC/MOD TYPRABBASIC

Description This parameter specifies the power occupancy of the data partof reference TFC.

The uplink reference gain factors, βc,ref and βd,ref, are defined in the following table:

Typical Service βc,ref : βd,ref

CS Domain RAB

12.2 bit/s AMR 12:15

23.85 kbit/s AMR-WB 12:15

64 kbit/s conversational 6:15



28.8 kbit/s conversational 13:15



3-17


57.6 kbit/s streaming 7:15

PS Domain RAB





384 kbit/s streaming 4:15








384 kbit/s background 4:15









384 kbit/s interactive 4:15














SRB

3.4 kbit/s SRB 15:12

13.6 kbit/s SRB 12:15

27.2 kbit/s SRB 11:15


Either Reference BetaC or Reference BetaD must be set to 15 for each instance of uplinkreference power offset.

In a RAB combination, all the radio bearers use the reference values of the bearer whosemaximum bit rate defined in Transport Format (TF) is the highest among the bit rates of all theradio bearers combined. For example, for the combination of 3.4 kbit/s SRB service, 384 kbit/s background service, and 12.2 kbit/s AMR service, the reference power offset values appliedare those belonging to the maximum rate TF (12 x 336) of the 384 kbit/s background radio bearer.

Rate MatchingRate matching is used for power balancing between transport channels, which is equivalent tochanging the bit energy of each transport channel. Rate matching improves the power usage andreduces interference.

The rate matching is also used to:

l Enable a CCTrCH to multiplex data bits from multiple traffic subflows; the system matchestraffic rates to physical channel rates.

l Meet different QoS requirements: the system adjusts the coding redundancy degree of eachchannel.

The higher the QoS requirement is, the higher the Rate Matching Attribute (RMA) value.According to the RMA value for each traffic channel, the rate matching mechanism repeats morebits, or punctures fewer bits of the services with higher QoS requirements. For services withlower QoS, the rate matching mechanism repeats fewer bits, or punctures more bits. That is, therate matching mechanism meets different QoS requirements through adjusting the codingredundancy degree of each transport channel.

The RMA value for uplink is defined by the UL rate matching attribute parameter, which isdescribed in the following table:

Parameter Name UL rate matching attribute

Parameter ID ULRATEMATCHINGATTR



3-19

GUI Range 1 to 256


Default Value 170


MML Command

ADD TYPSRBSEMISTATICTF/MODTYPSRBSEMISTATICTF/ADDTYPRABSEMISTATICTF/MODTYPRABSEMISTATICTF

Description RMA is a semi-static parameter provided by the upper layerfor each traffic channel according to QoS. It represents theweight of processing (repeating or deleting) data bits on thecorresponding transport channel during rate matching.This parameter is valid in the case of multiplexing of transportchannels, that is, when multiple transport channels arecombined into a CCTrCH.

RMA parameters for uplink and downlink are defined for each RAB in the following table:

Typical Service UL Rate MatchingAttribute

DL Rate MatchingAttribute

CS Domain RAB

12.2 bit/s AMR137 (for subflow 0) : 130(for subflow 1) : 161 (forsubflow 2)

137 (for subflow 0) : 130(for subflow 1) : 161 (forsubflow 2)

23.85 kbit/s AMR-WB173 (for subflow 0) : 200(for subflow 1) : 256 (forsubflow 2)

182 (for subflow 0) : 203(for subflow 1) : 256 (forsubflow 2)

64 kbit/s conversational 110 110



28.8 kbit/s conversational 100 100

57.6 kbit/s streaming 100 100

PS Domain RAB











384 kbit/s streaming 101 101








384 kbit/s background 101 101









384 kbit/s interactive 101 101









SRB

3.4 kbit/s SRB 180 180

13.6 kbit/s SRB 180 180



3-21



27.2 kbit/s SRB 180 180

First Radio Link Establishment

Transmit Power Control (TPC) commands that are sent on a downlink radio link from NodeBsthat have not yet achieved uplink synchronization must follow the following rules whenestablishing the first radio link:

If the radio link is part of the first radio link set sent to the UE and if the value "n" obtained fromthe DL power control mode 1 parameter is not 0, then:

l The TPC pattern must consist of n instances of the pair of TPC commands ("0", "1"),followed by one instance of the TPC command "1". The ("0", "1") indicates the TPCcommands to transmit in two consecutive timeslots.

l The TPC pattern continuously repeats but must be forcibly restarted at the beginning ofeach frame where the Connection Frame Number (CFN) mod 4 = 0.

Otherwise,

l The TPC pattern must consist of TPC commands "1" only.

l The TPC pattern must terminate when uplink synchronization is achieved.

The DL power control mode 1 parameter is described in the following table:

Parameter Name DL power control mode 1

Parameter ID DLTPCPATTERN01COUNT

GUI Range 0 to 30


Default Value 10


MML Command ADD CELLSETUP/MOD CELLSETUP

Description This parameter specifies the downlink TPC mode of the firstradio link set before completion of uplink synchronization.

CAUTIONTo change the DL POWER CONTROL MODE 1 value through MOD CELLSETUP, thecell must first be deactivated through DEA CELL.





Transmit Power Control in the Uplink DPCCH Power Control Preamble

An uplink DPCCH Power Control (PC) preamble is a segment of uplink DPCCH transmissionthat is sent before the start of the uplink DPDCH transmission. The PC preamble is used to ensurethat the inner-loop power control has converged when the transmission of the data bits beginsand the PC preamble consists of DPCCH timeslots that are transmitted before the data istransmitted. The RNC transmits the PC preamble parameter (number of DPCCH preambletimeslots) in the uplink DPCH power control IE using RRC signaling.

In addition to the PC preamble delay, the UE will not send any data on SRBs during the numberof frames indicated in the SRB delay IE. The SRB delay IE is also transmitted in the uplinkDPCH power control IE using RRC signaling.

Depending on application scenario, different values for the length of PC Preamble and SRBdelay are configured according to the following:

l In the case of RRC connection establishment, the length of PC preamble and SRB delayare defined by the parameters RRC Proc DPCCH PC preamble length and RRC ProcSRB delay.

l In the case of hard handover, the length of PC Preamble and SRB delay are defined by theparameters HHO Proc DPCCH PC preamble length and HHO Proc SRB delay.

The parameters that define the PC preamble and SRB delay are described in the following tables:

Parameter Name RRC Proc DPCCH PC preamble length

Parameter ID RRCPROCPCPREAMBLE

GUI Range 0 to 7


Default Value 0



Description This parameter specifies the DPDCH power control preamblelength in DCH RRC procedure.

Parameter Name RRC Proc SRB delay

Parameter ID RRCPROCSRBDELAY

GUI Range 0 to 7


Default Value 7





3-23

Description This parameter specifies the delay of SRB in DCH RRCprocedure.

Parameter Name HHO Proc DPCCH PC preamble length

Parameter ID HHOPROCPCPREAMBLE

GUI Range 0 to 7


Default Value 7



Description This parameter specifies the DPDCH power control preamblelength in DCH hard handover procedure.

Parameter Name HHO Proc SRB delay

Parameter ID HHOPROCSRBDELAY

GUI Range 0 to 7


Default Value 7



Description This parameter specifies the delay of SRB in DCH hardhandover procedure.

When the DPCCH PC preamble has been transmitted and the SRB delay passed, data starts tobe transmitted on the DPDCH at an initial transmit power deduced from the current DPCCHtransmit power and the DPDCH and DPCCH power difference (using βc and βd gain factors).

Downlink Open-Loop Power Control on Common Channels

Downlink open-loop power control is used to determine how much power to allocate to downlinkcommon channels.

The common channels are as follows:

l P-CPICH = Primary Common Pilot Channel





l P-SCH = Primary Synchronization Channel

l S-SCH = Secondary Synchronization Channel

l P-CCPCH = Primary Common Control Physical Channel

l S-CCPCH = Secondary Common Control Physical Channel

l AICH = Acquisition Indicator Channel

l PICH = Paging Indicator Channel

The P-CPICH power is set through the PCPICH transmit power parameter as an absolute valuein dBm. The powers of the other common channels are defined in relation to the P-CPICH power.For detailed information on the PCPICH transmit power parameter, see 3.1.1.1 Uplink Open-Loop Power Control on PRACH.

The following tables describe the parameters used to determine the powers of the commonchannels:

Parameter Name PSCH transmit power

Parameter ID PSCHPOWER


Physical Range & Unit–35 to 15Step: 0.1Unit: dB

Default Value –50


MML Command ADD PSCH/MOD CELL

Description This parameter specifies the offset of the P-SCH transmit powerfrom the P-CPICH transmit power in a cell.

Parameter Name SSCH transmit power

Parameter ID SSCHPOWER



Default Value –50


MML Command ADD SSCH/MOD CELL

Description This parameter specifies the offset of the S-SCH transmit powerfrom the P-CPICH transmit power in a cell.



3-25

Recommendation

The values of PSCH transmit power and SSCH transmit power must not be too large. Theparameter values can be adjusted based on the measurement in the actual environment, so thatthe transmit powers of the synchronization channels satisfy the UE receiving demodulationrequirement. The transmit power should be just enough to ensure that a UE can implementfast synchronization in most areas of the cell edge. Neither P-SCH nor S-SCH comes throughchannel code spectrum spreading, so they produce more serious interference than otherchannels, especially for near-end UEs.

Parameter Name BCH transmit power

Parameter ID BCHPOWER



Default Value –20


MML Command ADD BCH/MOD CELL

Description This parameter specifies the offset of the BCH, which is mappedto P-CCPCH transmit power from the P-CPICH transmit powerin a cell.

Recommendation

Be careful when setting the value of the BCH transmit power parameter. This value isadjusted and optimized based on the measurement in the actual environment. If the value ofthis parameter is too small, the UEs at the cell edge will fail to receive the system informationcorrectly, and the downlink common channel coverage will be influenced, which will affectcell coverage. If the value is too large, other channels will be interfered and the cell capacitywill be reduced.

Parameter Name Max transmit power of FACH

Parameter ID MAXFACHPOWER







Default Value 10


MML Command ADD FACH/MOD SCCPCH

Description This parameter specifies the offset between the transmit powerof S-CCPCH carrying FACH and the transmit power of P-CPICH in a cell.

Recommendation

Set the value of the Max transmit power of FACH parameter to a value that is just enoughto ensure the target BLER. If the value of this parameter is too small, the UEs at the cell edgewill fail to receive correctly the services and signaling carried over the FACH, which resultsin influence on the downlink common channel coverage, and the cell coverage. If it is toolarge, other channels will be interfered and the cell capacity will be reduced.

CAUTIONTo change the value of Max transmit power of FACH when the current cell is active and thereis only one S-CCPCH in this cell, or to change the configuration of the S-CCPCH with thesmaller S-CCPCH ID when there are two S-CCPCHs in this cell, the cell must first be deactivatedthrough the DEA CELL command.

Parameter Name PCH power

Parameter ID PCHPOWER



Default Value –20


MML Command ADD PCH/MOD SCCPCH

Description This parameter specifies the offset between the transmit powerof S-CCPCH carrying PCH and the transmit power of P-CPICHin a cell.



3-27

Recommendation

Be careful when setting the value of the PCH power parameter. If the value of this parameteris too small, the UEs at the cell edge will fail to receive paging messages correctly, whichwill influence downlink common channel coverage and cell coverage. If it is too large, otherchannels will be interfered and the cell capacity will be reduced.

Parameter Name AICH power offset

Parameter ID AICHPOWEROFFSET


Physical Range & Unit –22 to 5 dB

Default Value –6


MML Command ADD CHPWROFFSET/MOD AICHPWROFFSET

Description This parameter specifies the offset between the transmit powerof AICH and that of P-CPICH.

Recommendation

An appropriate transmit power value should be set for AICH to ensure that all UEs at celledge can receive the access indication. To avoid waste of power, the value of the transmitpower should not be too large.

Parameter Name PICH power offset

Parameter ID PICHPOWEROFFSET


Physical Range & Unit –10 to 5 dB

Default Value –7


MML Command ADD CHPWROFFSET/MOD PICHPWROFFSET

Description This parameter specifies the offset between the transmit powerof PICH and that of P-CPICH.





Recommendation

Be careful when setting the value of the PICH power offset parameter. If the value of thisparameter is too small, the UEs at the cell edge will fail to receive paging indicators correctly,which may result in incorrect reading of the PCH channel, which will affect the downlinkcommon channel and cell coverage. If it is too large, other channels will be interfered and thecell capacity will be reduced.

Downlink Open-Loop Power Control on DCHDownlink open-loop power control on DCH is used to determine the DPDCH transmit powerbased on the measured results of RACH IE from the UE.

Procedure of Downlink Open-Loop Power Control on DPDCHBoth UE and UTRAN take part in downlink open-loop power control on the DPDCH, as shownin Figure 3-3.

Figure 3-3 Downlink open-loop power control on the DPDCH

Calculating Initial Transmit Power of the Downlink DPCHThe initial power of the DPDCH is calculated with the following formula:



3-29

where:

l Pinitial is the initial power of the DPDCH.

l PCPICH is the P-CPICH transmit power in a cell. The value is defined by the PCPICHtransmit power parameter. For detailed information on the parameter, see 3.1.1.1 UplinkOpen-Loop Power Control on PRACH.

l Ri is the requested data bit rate of the ith service by the UE.

l W is the chip rate.

l (Eb/No)DL, I is the Eb/No target used to ensure the service quality of the ith service. Eb isthe energy of a signal information bit and No is the noise energy. In Huawei implementation,the RNC searches for a value of Eb/No target dynamically by using a set of predefinedvalues corresponding to the specific cell environment type, code type, coding rate, andBlock Error Rate (BLER) target.

l (Ec/No)CPICH is the ratio of received energy per chip to noise spectral density of CPICHreceived by the UE.

l α is the orthogonality factor in the downlink. In the WCDMA system, orthogonal codesare employed in the downlink to separate the physical channels, and without any multi-path propagation, the orthogonality remains when the NodeB signal is received by the UE.However, if there is sufficient delay spread in the radio channel, part of the NodeB signalswill be regarded as multiple access interference by the UE. The orthogonality of 1corresponds to perfectly orthogonal users. In the Huawei implementation, α is set to 0.

l Ptotal is the downlink transmitted carrier power measured at the NodeB and reported to theRNC.

Initial Power Setting of DPDCH During Soft Handover

To prevent waste of downlink power while adding a new radio link to the active set, a poweroffset adjustment for the new radio link is used. Based on the calculation used for calculatingthe initial transmit power of the DPDCH, the power of the new radio link is decreased by a poweroffset, which is defined by the Initial power offset for SHO parameter. This parameter is onlyavailable when the branch parameter DOWNLINK_POWER_BALANCE_SWITCH of thePower control algorithm switch parameter is set to ON. The Initial power offset for SHOand Power control algorithm switch parameters are described in the following tables:

Parameter Name Initial power offset for SHO

Parameter ID SHOINITPWRPO

GUI Range 0 to 25


Default Value 15



Description This parameter specifies the initial downlink power offset for anew radio link in the SRNC.





Parameter Name Power control algorithm switch

Parameter ID PcSwitch:INNER_LOOP_DL_LMTED_PWR_INC_SWITCH

GUI Range 1 (ON), 0 (OFF)


Default Value 0


MML Command SET CORRMALGOSWITCH

Description When this switch is set to ON, limited power increasealgorithm is applied to the inner-loop power control.

Upper and Lower Limits of Downlink DPDCH PowerThe power of the downlink DPDCH is limited by the upper and lower limits for each radio link.This limitation is set through the RL Max DL TX power and RL Min DL TX powerparameters. These parameters are described in the following tables:

Parameter Name RL Max DL TX power

Parameter ID RLMAXDLPWR



Default Value Values according to data rates of RABs


MML Command ADD CELLRLPWR/MOD CELLRLPWR

Description This parameter specifies the maximum downlink transmitpower of a radio link. The value of this parameter must fulfillthe coverage requirement of the network planning, and it isrelative to the P-CPICH transmit power.

Parameter Name RL Min DL TX power

Parameter ID RLMINDLPWR




3-31


Default Value Values according to data rates of RABs


MML Command ADD CELLRLPWR/MOD CELLRLPWR

Description This parameter specifies the minimum downlink transmit powerof a radio link. The setting of this parameter must take themaximum downlink transmit power and the dynamic range ofpower control into consideration. The parameter is relative tothe P-CPICH transmit power.

The values of the RL Max DL TX power and RL Min DL TX power parameters are providedfor different data rates of RABs. Therefore, a pair of the two parameters define a set of valuesrather than single values. Table 3-1 provides some examples of the set of values that can be usedfor some typical services.

Table 3-1 Upper and lower limits of downlink DPDCH power for some typical services

Typical Service RL Max DL TX Power RL Min DL TX Power

CS Domain RAB

12.2 bit/s 0 –150

28.8 kbit/s –20 –170

32 kbit/s –20 –170

56 kbit/s 0 –150

57.6 kbit/s –10 –160

64 kbit/s 30 –120

PS Domain RAB

384 kbit/s 40 –110

256 kbit/s 40 –130

144 kbit/s 20 –150

128 kbit/s 20 –150

64 kbit/s 20 –170

32 kbit/s 0 –190

16 kbit/s –20 –210





Typical Service RL Max DL TX Power RL Min DL TX Power

8 kbit/s –40 –230

0 kbit/s –20 –170

Power Offset Between DPCCH and DPDCH

For the downlink DPCH, the transmit power offset between DPCCH and DPDCH is determinedby the network. The downlink power control implements simultaneously on a DPCCH and itscorresponding DPDCHs. The power control adjusts the powers of the DPCCH and DPDCHswith the same step, that is, the power offset between DPCCH and DPDCH is not changed.

Power offsets between DPCCH and DPDCH in downlink are identical for all TFCs in the TFCS,whereas in the uplink the gain factors are TFC-dependent. The power offsets of Transport FormatCombination Indicator (TFCI), TPC, and pilot fields of the DPCCH related to the power ofDPDCHs are defined by the TFCI power offset, TPC power offset, and Pilot power offsetparameters. These parameters are described in the following tables:

Parameter Name TFCI power offset

Parameter ID TFCIPO

GUI Range 0 to 24

Physical Range & Unit0 to 6Step: 0.25Unit: dB

Default Value 0


MML Command SET FRC

Description This parameter specifies the offset of TFCI bit transmit powerfrom data bit transmit power in each timeslot of radio frames ondownlink DPCH.

Parameter Name TPC power offset

Parameter ID TPCPO

GUI Range 0 to 24


Default Value 12



3-33


MML Command SET FRC

Description This parameter specifies the offset of TPC bit transmit powerfrom data bit transmit power in each timeslot of radio frames ondownlink DPCH.

Parameter Name Pilot power offset

Parameter ID PILOTPO

GUI Range 0 to 24


Default Value 12


MML Command SET FRC

Description This parameter specifies the offset of pilot bit transmit powerfrom data bit transmit power in each timeslot of radio frames ondownlink DPCH.

Downlink Open-Loop Power Control on F-DPCHDownlink Open-Loop Power Control on F-DPCH describes how to calculate the initial transmitpower of the downlink Fractional Dedicated Physical Channel (F-DPCH) and the limits of theF-DPCH power.

Calculating Initial Transmit Power of the Downlink F-DPCHThe initial transmit power of the downlink F-DPCH, PF-DPCH,Initial is calculated with thefollowing formula:

where:

l PCPICH is the P-CPICH transmit power in a cell. It is defined by the PCPICH transmitpower parameter. For detailed information on the parameter, see 3.1.1.1 Uplink Open-Loop Power Control on PRACH.

l (Ec/No)CPICH is the ratio of received energy per chip to noise spectral density of CPICHreceived by the UE.





l α is the orthogonality factor in the downlink. Orthogonal codes are employed in thedownlink to separate the physical channels, and without any multi-path propagation, theorthogonality remains when the NodeB signal is received by the UE. If there is sufficientdelay spread in the radio channel, part of the NodeB signals will be regarded as multipleaccess interference by the UE. The orthogonality of 1 corresponds to perfectly orthogonalusers. In the Huawei implementation, α is set to 0.

l Ptotal is the downlink transmitted carrier power measured at the NodeB. This power isreported to the RNC.

l (Ec/N0)F-DPCH is the Ec/NO required for the TPC symbol error rate of the F-DPCHstipulated by the protocol, that is, a symbol error rate of 4%. This Ec/NO is set to -17 dB.

Initial Power Setting of F-DPCH During Soft Handover

To prevent waste of downlink power while adding a new radio link to the active set, a poweradjustment for the new radio link is used. Based on the calculation used for calculating the initialtransmit power of the F-DPCH, the power of the new radio link is decreased by a power offset,which is defined by the Soft handover initial power offset parameter. This parameter is onlyavailable when the branch parameter DOWNLINK_POWER_BALANCE_SWITCH of thePower control algorithm switch parameter is set to ON. For detailed information on the Powercontrol algorithm switch parameter, see 3.1.1.4 Downlink Open-Loop Power Control onDCH. The Soft handover initial power offset parameter is described in the following table:

Parameter Name Soft handover initial power offset

Parameter ID SHOLINKINIPO

GUI Range 0 to 25


Default Value 15


MML Command SET FDPCHRLPWR

Description This parameter specifies the initial downlink power offset for anew F-DPCH in the SRNC.

Upper and Lower Limits of Downlink F-DPCH Power

The maximum and minimum values of the transmit power range of downlink F-DPCH iscalculated with the following formulas:.

Maximum transmit power value = PCPICH + FDPCH maximum reference power + F-DPCHPower Offset

Minimum transmit power value = PCPICH + FDPCH minimum reference power + F-DPCHPower Offset

where:



3-35

l PCPICH is the P-CPICH transmit power in a cell. It is defined by the PCPICH transmitpower parameter. For detailed information on the parameter, see 3.1.1.1 Uplink Open-Loop Power Control on PRACH.

The parameters used in the formulas are described in the following tables:

Parameter Name FDPCH minimum reference power

Parameter ID FDPCHMINREFPWR


Physical Range & Unit–35 to +15Step: 0.1Unit: dB

Default Value –200



Description This parameter specifies the minimum reference power of the F-DPCH. It is relative to the transmit power of the P-CPICH.NOTE

The initial value of the parameter is sent to the NodeB through the InitialDL Transmission Power IE included in an NBAP message.

F-DPCH reference power = PF-DPCH,Initial – F-DPCH Power Offset,where PF-DPCH,Initial is the initial transmit power of the F-DPCH.

Parameter Name F-DPCH Power Offset

Parameter ID FDPCHPO2

GUI Range 0 to 24


Default Value 12


MML Command SET FDPCHPARA

Description This parameter specifies the power offset of TPC command in F-DPCH to the reference power of the F-DPCH.

Parameter Name FDPCH maximum reference power





Parameter ID FDPCHMAXREFPWR


Physical Range & Unit–35 to +15Step: 0.1Unit: dB

Default Value –30



Description This parameter specifies the maximum reference power of the F-DPCH. It is relative to the transmit power of the P-CPICH.

3.1.2 Inner-Loop Power ControlInner-loop power control is also called fast closed-loop power control. It controls the transmitpower according to the information returned from the peer physical layer. The UE and the NodeBcan adjust the transmit power according to the SIR from the peer end, to compensate for thefading of radio links.

Inner-loop power control consists of uplink inner-loop power control and downlink inner-looppower control, which work separately.

3.1.2.1 Uplink Inner-Loop Power ControlUplink inner-loop power control is used on the DPCCH. This power control is done in eithernormal or compressed mode.

3.1.2.2 Uplink Inner-Loop Power Control in Compressed ModeUplink Inner-Loop Power Control is used on the DPCCH. This power control is done in eithernormal or compressed mode.

3.1.2.3 Downlink Inner-Loop Power ControlDownlink Inner-Loop Power Control is used on the DPCCH. This power control is done in eithernormal or compressed mode.

3.1.2.4 Downlink Inner-Loop Power Control in Compressed ModeThis describes the downlink inner-loop power control in compressed mode from the followingtwo aspects: adjustment of the UE to the downlink SIRtarget, and adjustment of the NodeB to thetransmit power.

Uplink Inner-Loop Power Control

Uplink inner-loop power control is used on the DPCCH. This power control is done in eithernormal or compressed mode.

Uplink Inner-Loop Power Control provides information on procedures and algorithms that areused in both normal and compressed mode. 3.1.2.2 Uplink Inner-Loop Power Control inCompressed Mode provides information on procedures and algorithms that are unique for thecompressed mode.



3-37

The relative DPDCH transmit power is calculated according to the DPCCH transmit power, andthe DPDCH and DPCCH power ratio (βd/βc). For detailed information on how to calculate theDPDCH transmit power, see 3.1.1.2 Uplink Open-Loop Power Control on DCH.

Procedure of Uplink Inner-Loop Power ControlThe procedure of uplink inner-loop power control is as follows:

1. The RNC sends a target Signal-to-Interference Ratios (SIRs), denoted as SIRtarget, to thecells in the active set.

2. Each cell in the active set estimates the SIR, denoted as SIRest, at each timeslot andcompares the SIRest with the SIRtarget.

3. The cell in the active set sends a TPC command to the UE based on the comparison resultaccording to the following:l If SIRest is larger than SIRtarget, the cell in the active set sends a TPC command "0" to

the UE. The TPC command is sent on the TPC field of the downlink DPCCH.l If SIRest is the same as, or smaller than, the SIRtarget, the cell in the active set sends a

TPC command "1" to the UE. The TPC command is sent on the TPC field of thedownlink DPCCH.

4. The power control module of the UE uses the inner-loop power control algorithm tocalculate the power offset.

5. If necessary, the transmission module of the UE adjusts the transmit power according tothe power offset.

Calculating Power Offsets for Inner-Loop Power ControlThere are two types of inner-loop power control algorithms (PCAs): PCA1 and PCA2. The RNCconfigures the PCA through the Power control algorithm selection parameter. This parameteris described in the following table:

Parameter Name Power control algorithm selection

Parameter ID PWRCTRLALG

GUI Range ALGORITHM1, ALGORITHM2


Default Value ALGORITHM1


MML Command SET FRC

Description

This parameter is used to inform the UE of the method fortranslating the received TPC commands.The value ALGORITHM1 denotes PCA1, and the valueALGORITHM2 denotes PCA2.

PCA1





When using the PCA1, the UE adjusts the uplink transmit power for every timeslot.

When receiving one or more TPC commands, the UE calculates TPC_cmd by using PCA1, andthen calculates the power offset with the following formula:

ΔDPCCH = ΔTPC x TPC_cmd

where:

l ΔDPCCH is the power offset.

l ΔTPC is the power control step size. The value is defined by the UL closed loop powercontrol step size parameter, which is described in the following table:

Parameter Name UL closed loop power control step size

Parameter ID ULTPCSTEPSIZE

GUI Range 1, 2


Default Value 1


MML Command SET FRC

Description

This parameter is used to set the step size of closed-looppower control performed on the uplink DPCCH. Thisparameter is mandatory when the Power control algorithmselection parameter is set to ALGORITHM1.

PCA2

When using the PCA2, the UE adjusts the uplink transmit power on a 5-timeslot cycle.

After receiving five consecutive TPC commands, the UE calculates TPC_cmd by using PCA2,and then calculates the power offset according to the following formula:

ΔDPCCH = ΔTPC x TPC_cmd


l ΔTPC is the power control step size. For the PCA2 algorithm, this value is fixed and thevalue is 1 dB.

Uplink Inner-Loop Power Control in Compressed ModeUplink Inner-Loop Power Control is used on the DPCCH. This power control is done in eithernormal or compressed mode.

Uplink Inner-Loop Power Control in Compressed Mode only provides information onprocedures and algorithms that are unique for compressed mode. 3.1.2.1 Uplink Inner-LoopPower Control provides information on the process and algorithms that are used in both normaland compressed mode. For detailed information on the compressed mode, refer to the 3GPP TS25.215.



3-39

In compressed mode, one or more transmission gap pattern sequences are active. Therefore,some frames are compressed and contain transmission gaps. The uplink inner-loop power controlin compressed mode is used to recover the SIR close to the SIR target after each transmissiongap as rapidly as possible.

Procedure of Uplink Inner-Loop Power Control in Compressed ModeThe procedure of uplink inner-loop power control in compressed mode is as follows:

1. Calculating Cells in the Active Set on the SIR Target.2. Adjusting the UE Uplink DPCCH Transmit Power in Compressed Mode.

Calculating Cells in the Active Set on the SIR TargetIn uplink inner-loop power control, TPC commands are transmitted, once per timeslot. Duringtransmission gaps, the TPC commands are not transmitted. The first step in the uplink inner-loop process is to decide which TPC command to send, 0 or 1. This decision is based on thefollowing rules:l If SIRest is larger than SIRcm_target, then the TPC command to transmit is 0.

l If SIRest is smaller than SIRcm_target, then the TPC command to transmit is 1.

The SIRcm_target is calculated with the following formula:

SIRcm_target = SIRtarget + ΔSIRPILOT + ΔSIR1_coding + ΔSIR2_coding

where:

l SIRcm_target is the SIR target in compressed mode.

l SIRtarget is the SIR target sent by the RNC.

l ΔSIRPILOT is calculated with the following formula:

ΔSIRPILOT = 10Log10 (Npilot,N/Npilot,curr_frame)

where:– Npilot,curr_frame is the number of pilot bits per timeslot in the current uplink frame.

– Npilot,N is the number of pilot bits per timeslot in a normal uplink frame without atransmission gap.

l ΔSIR1_coding and ΔSIR2_coding are calculated based on uplink parameters according tothe following:– If the start of the first transmission gap in the transmission gap pattern is within the

current uplink frame, then ΔSIR1_coding = NodeB DeltaSIR1.– If the current uplink frame just follows a frame containing the start of the first

transmission gap in the transmission gap pattern, then ΔSIR1_coding = NodeBDeltaSIRafter1.

– If the start of the second transmission gap in the transmission gap pattern is within thecurrent uplink frame, then ΔSIR2_coding = NodeB DeltaSIR2 .

– If the current uplink frame just follows a frame containing the start of the secondtransmission gap in the transmission gap pattern, then ΔSIR2_coding = NodeBDeltaSIRafter2.

– For all other cases, ΔSIR1_coding = 0 dB and ΔSIR2_coding = 0 dB.





The parameters used for calculating ΔSIR1_coding and ΔSIR2_coding are described in thefollowing tables:

Parameter Name NodeB DeltaSIR1

Parameter ID NODEBDELTASIR1A

GUI Range 0 to 30

Physical Range &Unit

0 to 3Step: 0.1Unit: dB

Default Value Refer to Table 3-3.

Optional/Mandatory

Mandatory

MML Command SET TGPSCP

Description This parameter specifies the delta in the uplink SIR target valueto be set in the NodeB within the frame containing the start ofthe first transmission gap in the transmission gap pattern.

Parameter Name NodeB DeltaSIRafter1

Parameter ID NODEBDELTASIRAFTER1A

GUI Range 0 to 30




Optional/Mandatory

Mandatory


Description This parameter specifies the delta in the uplink SIR target valueto be set in the NodeB within the frame that is after the framecontaining the start of the first transmission gap in thetransmission gap pattern.

Parameter Name NodeB DeltaSIR2

Parameter ID NODEBDELTASIR2A

GUI Range 0 to 30



3-41




Optional/Mandatory

Optional


Description This parameter specifies the delta in the uplink SIR target valueto be set in the NodeB within the frame containing the start ofthe second transmission gap in the transmission gap pattern.

Parameter Name NodeB DeltaSIRafter2

Parameter ID NODEBDELTASIRAFTER2A

GUI Range 0 to 30




Optional/Mandatory

Optional


Description This parameter specifies the delta in the uplink SIR target valueto be set in the NodeB within the frame that is after the framecontaining the start of the second transmission gap in thetransmission gap pattern.

If several compressed mode pattern sequences are being used simultaneously,ΔSIR1_coding and ΔSIR2_coding offsets are calculated for each compressed mode patternand all ΔSIR1_coding and ΔSIR2_coding offsets are summarized.

Adjusting the UE Uplink DPCCH Transmit Power in Compressed Mode

Unless otherwise specified, the UE adjusts the transmit power of the uplink DPCCH with thepower offset, ΔDPCCH, in every timeslot in compressed mode. The power offset is calculatedwith the following formula:

ΔDPCCH = ΔTPC x TPC_cmd + ΔPILOT

where:






l ΔTPC is the power control step size. For detailed information, see 3.1.2.1 Uplink Inner-Loop Power Control.

l the value of ΔPILOT is calculated with the following formula:

ΔPILOT = 10Log10 (Npilot,prev/Npilot,curr)

where:– Npilot,prev is the number of pilot bits in the most recently transmitted timeslot.

– Npilot,curr is the number of pilot bits in the current timeslot.

Compressed FramesIn compressed mode, compressed frames can occur in either the uplink or the downlink, or both.When compressed frames occur, the adjustments of the UE uplink DPCCH transmit power varyas follows:

l When the compressed mode is applied to the downlink, no TPC command is transmittedduring the transmission gaps. Therefore, the uplink DPCCH and DPDCH transmit powerof the UE remains unchanged during the transmission gaps. The UE only needs to adjustthe power according to the TPC command after the transmission gaps.

l When the compressed mode is applied to the uplink or to both directions, the transmissionof uplink DPDCH(s) and DPCCH must be stopped during the transmission gaps. The UEneeds to resume the DPCCH and DPDCH transmit power as quickly as possible accordingto the TPC command after the transmission gaps. This period for resumption of the poweris called a recovery period. The adjustment of the UE DPCCH transmit power in thissituation is described in the following sections.

Calculating DPCCH Transmit Power at the Start of the First Timeslot After aTransmission Gap

At the start of the first timeslot after an uplink or downlink transmission gap, the UE changesthe transmit power of the uplink DPCCH with the power offset, ΔDPCCH (in dB). The poweroffset is calculated with the following formula:

ΔDPCCH = ΔRESUME + ΔPILOT

where:


l ΔRESUME is defined by the UE according to the ITP parameter.

l ΔPILOT is calculated with the following formula described in the Adjusting the UE UplinkDPCCH Transmit Power in Compressed Mode section above.

The ITP parameter is described in the following table:

Parameter Name ITP

Parameter ID ITPA

GUI Range MODE0, MODE1


None



3-43


Optional/Mandatory

Mandatory


Description The ITP is related to the convergence of closed-loop power control.Appropriate ITP enables fast convergence. When the cell covershighways, set this parameter to MODE1. Otherwise, set thisparameter to MODE0.

Table 3-2 describes how to calculate ΔRESUME in different ITP modes.

Table 3-2 Calculating ΔRESUME in different ITP modes

ITP Mode Calculation of ΔRESUME

MODE0 ΔRESUME = ΔTPC x TPC_cmdgap

TPC_cmdgap is the value of TPC_cmd derived in the first timeslot of the uplinktransmission gap if a downlink TPC command is transmitted in that timeslot.Otherwise, TPC_cmdgap should be 0.





ITP Mode Calculation of ΔRESUME

MODE1 ΔRESUME = δlast

δlast is equal to the most recently calculated value of δi. δi needs to be calculatedfor the following timeslots:l All timeslots in which both the uplink DPCCH and a downlink TPC

command are transmitted.l The first timeslot of an uplink transmission gap if a downlink TPC command

is transmitted in that timeslot.The recursive algorithm for calculating δi is

where:l TPC_cmdi is the power control command derived by the UE in that timeslot.

l If additional scaling is applied in the current timeslot and the previoustimeslot, then ksc = 0. Otherwise, ksc = 1

l δi-1 is the value of δi calculated for the previous timeslot.

The starting value of δi-1 should be 0 when:

l The uplink DPCCH is activated.

l At the end of the first timeslot after each uplink transmission gap.

l At the end of the first timeslot after each downlink transmission gap.

The value of δi should be set to 0 at the end of the first timeslot after each uplinktransmission gap.

Recovery Period Power Control Mode

After a transmission gap in either the uplink or the downlink, the period following resumptionof simultaneous uplink and downlink DPCCH or F-DPCH transmission is called a recoveryperiod. The recovery period length (RPL) is expressed as a number of timeslots. RPL is equalto the minimum value out of the transmission gap length and seven timeslots. If a transmissiongap is scheduled to start before the RPL timeslots have elapsed, the recovery period must endat the start of the gap, and the value of RPL is reduced accordingly.

During the recovery period, two modes are possible for the PCA. The PCA is defined by theRPPparameter, which is described in the following table:

Parameter Name RPP

Parameter ID RPPA

GUI Range MODE0, MODE1


None



3-45


Optional/Mandatory

Mandatory


Description This parameter specifies the recovery period power control modeduring the frame after the transmission gap within the compressedframe.l When this parameter is set to MODE0, use the algorithm defined

by the Power control algorithm selection parameter.l When this parameter is set to MODE1, use PCA1 with the step

size ΔRP-TPC during RPL timeslots after each transmission gap.

For RPP mode 0, the algorithm determined by the PCA value is used to process TPC commands.

For RPP mode 1, during RPL timeslots after each transmission gap, PCA1 is applied with a stepsize ΔRP-TPC instead of ΔTPC. This is regardless of the value of PCA. Therefore, the change inthe uplink DPCCH transmit power at the start of each of the RPL+1 timeslots immediatelyfollowing the transmission gap (except for the first timeslot after the transmission gap) iscalculated with the following formula:

ΔDPCCH = ΔRP-TPC x TPC_cmd + ΔPILOT

where:


l ΔRP-TPC is the recovery power control step size and is expressed in dB. If PCA has the value1, ΔRP-TPC is equal to the minimum value of 3 dB and 2ΔTPC. If PCA has the value 2, ΔRP-

TPC is equal to 1 dB.

l ΔPILOT is calculated with the following formula described in the Adjusting the UE UplinkDPCCH Transmit Power in Compressed Mode section above.

After the recovery period, ordinary transmit power control resumes using the algorithm specifiedby the value of PCA and with a step size ΔTPC.

If PCA has the value 2, the sets of timeslots over which the TPC commands are processed shouldremain aligned to the frame boundaries in the compressed frame. For RPP mode 0 and RPPmode 1, if the transmission gap or the recovery period results in any incomplete sets of TPCcommands, TPC_cmd should be zero for those sets of timeslots which are incomplete.

Default Values of Parameters in Compressed Mode

Assume that the following values of the CM cell type parameter are called cell type group 1:l WALKING_SPEED_AND_HOT_SPOT_CELL

l LOW_SPEED_AND_MEDIUM_COVERAGE_CELL

l LOW_SPEED_AND_HIGH_COVERAGE_CELL

l MID_SPEED_AND_HOT_SPOT_CELL





l PICO_NODEB_TYPE_COVERAGE_CELL

l OTHER_CELL

The following values of the CM cell type parameter are called cell type group 2:l HIGH_SPEED_AND_HOT_SPOT_CELL

l HIGH_SPEED_AND_MEDIUM_COVERAGE_CELL

l HIGH_SPEED_AND_HIGH_COVERAGE_CELL

Table 3-3 describes the parameters associated with each cell type group for uplink inner-looppower control in compressed mode.

Table 3-3 Uplink parameter configuration in compressed mode

Parameter Name Parameter ID Parameter Value

Cell Type Group 1 Cell Type Group 2

CM method

CMMETHOD

l SPREADING_FACTOR_REDUCTION

l HIGH_LAYER_SCHEDULING



RPP RPPA Mode 1 Mode 0

ITP ITPA Mode 1 Mode 1

NodeB Delta SIR1 NODEBDELTASIR1A 12 12

NodeB DeltaSIRAfter1

NODEBDELTASIRAFTER1A

6 6

NodeB Delta SIR2 NODEBDELTASIR2A

12 12

NodeB DeltaSIRAfter2

NODEBDELTASIRAFTER2A

6 6

Comparison Between Uplink Inner-Loop Power Control in Normal andCompressed Modes

Table 3-4 provides information on some of the similarities and differences of uplink inner-looppower control in normal and compressed modes.



3-47

Table 3-4 Comparison between uplink inner-loop power control in normal and compressedmodes

Equipment Normal Mode Compressed Mode

Cell in theactive set

SIRest > SIRtarget, TPCcommand = "0"SIRest < SIRtarget, TPCcommand = "1"

SIRest > SIRcm_target, TPC command = 0

SIRest < SIRcm_target, TPC command = 1

SIRcm_target = SIRtarget + ΔSIRPILOT +ΔSIR1_coding + ΔSIR2_coding

UE ΔDPCCH = ΔTPC x TPC_cmd ΔDPCCH = ΔTPC x TPC_cmd + ΔPILOT

ΔPILOT = 10Log10 (Npilot,prev/Npilot,curr)

Downlink Inner-Loop Power ControlDownlink Inner-Loop Power Control is used on the DPCCH. This power control is done in eithernormal or compressed mode.

Downlink Inner-Loop Power Control provides information on the process and algorithms thatare used in both normal and compressed mode. 3.1.2.4 Downlink Inner-Loop Power Controlin Compressed Mode provides information on procedures and algorithms that are unique forthe compressed mode.

For detailed information on downlink inner-loop power control applied to soft handover, see3.1.4 Downlink Power Balancing.

Procedure of Downlink Inner-Loop Power ControlThe procedure of downlink inner-loop power control is as follows:

1. The UE checks the downlink power control mode and transmits a TPC command to theNodeB.

2. The UE obtains the SIR target, which is denoted SIRtarget.

3. The UE estimates the downlink SIR from the pilot symbols of the downlink DPCH,expressed as SIRest, and compares the SIRest with the SIRtarget.

4. Based on the comparison result, the UE transmits a TPC command to the NodeB.l If SIRest is larger than SIRtarget, the UE sends a TPC command 0.

l If SIRest is smaller than SIRtarget, the UE sends a TPC command 1.

5. The UTRAN adjusts its downlink DPCCH/DPDCH power according to the TPCcommand..

Checking the downlink power control mode and transmitting a TPC CommandThe downlink power control mode is defined by the DL power control mode parameter. Thisparameter is described in the following table:

Parameter Name DL power control mode

Parameter ID DPCMODE





GUI Range SINGLE_TPC, TPC_TRIPLET_IN_SOFT,TPC_AUTO_ADJUST


Default Value SINGLE_TPC


MML Command SET FRC

Description l SINGLE_TPC, a fast power control mode, indicates thata unique TPC command is sent in each timeslot on theDPCCH.

l TPC_TRIPLET_IN_SOFT, a slow power control mode,indicates that the same TPC command is sent in threetimeslots. It is applicable to soft handover and it candecrease the power deviation.

l TPC_AUTO_ADJUST, an automatic adjustment mode,indicates that the value of DPC_MODE can be modifiedby sending the ACTIVE SET UPDATE message to theUE.

The TPC command is sent according to the following:

l If the DL power control mode parameter is set to SINGLE_TPC, the UE sends a uniqueTPC command in each timeslot, and the TPC command generated is transmitted in the firstavailable TPC field of the uplink DPCCH.

l If the DL power control mode parameter is set to TPC_TRIPLET_IN_SOFT, the UErepeats the same TPC command over three timeslots, and the new TPC command istransmitted so that there is a new command at the beginning of the frame.

Obtaining the SIRtarget

The SIRtarget is set according to the following:

l The SIRtarget is configured by the upper layer. Typically, the SIRtarget is determined byouter-loop power control.

l For a downlink F-DPCH, the SIRtarget is set automatically by the UE based on the TPCCommand Error Rate Target parameter sent from the UTRAN. This parameter isdescribed in the following table:

Parameter Name TPC Command Error Rate Target

Parameter ID FdpchTpcCommandErrorRateTarget

GUI Range 1 to 10

Physical Range & Unit 0.01 to 0.1

Default Value 4



3-49


MML Command SET FDPCHPARA

Description This parameter specifies the quality target of thedownlink F-DPCH.This quality target is used by the UE to automatically setthe SIR target.

Adjusting the Downlink DPCCH and DPDCH PowerAfter comparing the SIRest with SIRtarget and sending a TPC command to the NodeB, thedownlink DPCCH and DPDCH power is adjusted according to the processes and formulasdescribed in this section.

Adjustment Intervals

The power can be adjusted every timeslot, or every three timeslots according to the following:

l If the DL power control mode parameter is set to SINGLE_TPC, the UTRAN estimatesthe transmitted TPC command TPCest to be 0 or 1 and updates the power every timeslot.

l If the DL power control mode parameter is set to TPC_TRIPLET_IN_SOFT, the UTRANestimates the transmitted TPC command TPCest over three timeslots to be 0 or 1 and updatesthe power every three timeslots.

Adjustment in Softer Handover

In case of softer handover, the NodeB uses the Maximum Ratio Combining (MRC) algorithmto derive a combined TPC command.

Calculating the Power Adjustment

After estimating the kth TPC command, the UTRAN calculates the power adjustment with thefollowing formula:

P(k) = P(k–1) + PTPC(k) + Pbal(k)

where:

l P(k) is the new power.

l P(k–1) is the current downlink power.

l PTPC(k) is the kth power adjustment due to the inner-loop power control.

l Pbal(k) is a correction according to the downlink power control procedure for balancingradio link powers towards a common reference power. In the scenario of single radio link,Pbal is equal to 0.

The PTPC(k) is calculated as follows:

l If the INNER_LOOP_DL_LMTED_PWR_INC_SWITCH under the Power controlalgorithm switch parameter is set to OFF, then the following formula is used:

, [dB]





For detailed information on the Power control algorithm switch parameter, see 3.1.1.4Downlink Open-Loop Power Control on DCH.The power control step size ΔTPC is set through the FDD DL power control step sizeparameter, which is described in the following table:

Parameter Name FDD DL power control step size

Parameter ID FDDTPCDLSTEPSIZE

GUI Range STEPSIZE_0.5DB, STEPSIZE_1DB,STEPSIZE_1.5DB, STEPSIZE_2DB

Physical Range & Unit0.5, 1, 1.5, 2Unit: dB

Default Value STEPSIZE_1DB


MML Command SET FRC

Description This parameter specifies the step size of the closed-loop power control performed on DL DPCH inFrequency Division Duplex (FDD) mode.

l If the INNER_LOOP_DL_LMTED_PWR_INC_SWITCH under the Power control

algorithm switch parameter is set to ON, then the following formula is used:

, [dB]where:

–

Δsum(k) is the temporary sum of the last DL_Power_Averaging_Window_Size inner-loop power adjustments (in dB). DL_Power_Averaging_Window_Size is set throughthe DL power window average size parameter.

Parameter Name DL power window average size

Parameter ID DLPOWERAVERAGEWINDOWSIZE

GUI Range 1 to 60

Physical Range & Unit Slot

Default Value 20





3-51

Description The UTRAN calculates the increase of downlinktransmit power within the period defined by thisparameter to determine whether the increaseexceeds the value defined by Power increaselimit. If the power increase exceeds the limit, theUTRAN will not increase the power even when itreceives the command to raise the power.

CAUTIONTo change the value of the DL power window average size parameter through MODCELLSETUP, deactivate the cell by using the DEA CELL command.

– Power_Raise_Limit is set through the Power increase limit parameter.

Parameter Name Power increase limit

Parameter ID POWERRAISELIMIT

GUI Range 0 to 10


Default Value 10



Description The increase of the downlink transmit powerwithin the period defined by DL power windowaverage size cannot exceed the value defined bythis parameter.

CAUTIONTo change the value of the Power increase limit parameter through MODCELLSETUP, deactivate the cell by using the DEA CELL command.

Downlink Inner-Loop Power Control in Compressed Mode

This describes the downlink inner-loop power control in compressed mode from the followingtwo aspects: adjustment of the UE to the downlink SIRtarget, and adjustment of the NodeB to thetransmit power.

This section only provides information that is unique for compressed mode. 3.1.2.3 DownlinkInner-Loop Power Control provides information on the process and algorithms that are used





in both normal and compressed mode. For detailed information on the compressed mode, referto the 3GPP TS 25.215.

Process of Downlink Inner-Loop Power Control in Compressed Mode

In compressed mode, one or more transmission gap pattern sequences are active. Therefore,some frames are compressed and contain transmission gaps. The downlink inner-loop powercontrol in compressed mode is used to recover the SIR close to the SIR target after eachtransmission gap as rapidly as possible.

Adjustment of the UE to the Downlink SIRtarget

Compared with the normal mode of power control, the compressed mode power control requiresthat the target SIR is changed in several frames.

The UE generates TPC commands and transmits the commands, except during downlinktransmission gaps, according to the following rules:

l If SIRest is larger than SIRcm_target, then the TPC command to transmit is 0.

l If SIRest is smaller than SIRcm_target, then the TPC command to transmit is 1.

SIRcm_target is calculated with the following formula:

SIRcm_target = SIRtarget + ΔSIR

where:

l SIRcm_target is the SIR target in compressed mode.

l SIRtarget is the SIR target sent by the RNC.

l ΔSIR is the target SIR offset for each frame during compressed mode and it is calculatedwith the following formula:

ΔSIR = max(ΔSIRi_compression, ..., ΔSIRn_compression) + ΔSIR1_coding +ΔSIR2_coding

where:

– ΔSIRi_compression is defined as:

– ΔSIRi_compression = 3 dB for downlink frames compressed by reducing thespreading factor by 2.

– ΔSIRi_compression = 0 dB in all other cases.

– n is the number of TTI lengths for all TrCHs of the CCTrCH.

– ΔSIR_coding is defined according to the following:

– ΔSIR1_coding is defined by the UE Delta SIR1 parameter if the start of the firsttransmission gap in the transmission gap pattern is within the current frame. Thisparameter is described in the following table:

Parameter Name UE Delta SIR1

Parameter ID UEDELTASIR1A

GUI Range 0 to 30



3-53



Default Value See Table 3-5.

Optional/Mandatory

Mandatory


Description This parameter specifies the delta in the downlink SIRtarget value to be set in the UE within the frame containingthe start of the first transmission gap in the transmissiongap pattern.

– ΔSIR1_coding is defined by the UE Delta SIRAfter1 parameter if the current frame

just follows a frame containing the start of the first transmission gap in thetransmission gap pattern. This parameter is described in the following table:

Parameter Name UE Delta SIRAfter1

Parameter ID UEDELTASIRAFTER1A

GUI Range 0 to 30




Optional/Mandatory

Mandatory


Description This parameter specifies the delta in the downlink SIRtarget value to be set in the UE after the frame containingthe start of the first transmission gap in the transmissiongap pattern.

– ΔSIR2_coding is defined by the UE Delta SIR2 parameter if the start of the second

transmission gap in the transmission gap pattern is within the current frame. Thisparameter is described in the following table:

Parameter Name UE Delta SIR2

Parameter ID UEDELTASIR2A

GUI Range 0 to 30








Optional/Mandatory

Mandatory


Description This parameter specifies the delta in the downlink SIRtarget value to be set in the UE during the frame containingthe start of the second transmission gap in the transmissiongap pattern.

– ΔSIR2_coding is defined by the UE Delta SIRAfter2 parameter if the current frame

just follows a frame containing the start of the second transmission gap in thetransmission gap pattern. This parameter is described in the following table:

Parameter Name UE Delta SIRAfter2

Parameter ID UEDELTASIRAFTER2A

GUI Range 0 to 30




Optional/Mandatory

Mandatory


Description This parameter specifies the delta in the downlink SIRtarget value to be set in the UE after the frame containingthe start of the second transmission gap in the transmissiongap pattern.

– ΔSIR1_coding = 0 and ΔSIR2_coding = 0 in all other cases.In case several compressed mode patterns are used simultaneously, a ΔSIR offset iscalculated for each compressed mode pattern and the sum of all ΔSIR offsets is appliedto the frame.

NOTE

Several compressed mode patterns applying to the same frames must be avoided.

Adjustment of the NodeB to the Transmit PowerThe power of the DPCCH and DPDCH in the first timeslot after the transmission gap should beset to the same value as in the timeslot just before the transmission gap.



3-55

During compressed mode except during downlink transmission gaps, UTRAN estimates the kthTPC command and adjusts the current downlink power P(k–1) to a new power P(k) with thefollowing formula:

P(k) = P(k–1) + PTPC(k) + PSIR(k) + Pbal(k)

where:

l P(k) is the new power.

l P(k–1) is the current downlink power.

l PTPC(k) is the kth power adjustment due to the inner-loop power control. The derivation ofPTPC(k) is described as follows:

– When the DL power control mode parameter is set to SINGLE_TPC:

– If no uplink TPC command is received, PTPC(k) derived by the NodeB should be setto 0.

– If a uplink TPC command is received, PTPC(k) is calculated the same way as innormal mode but with a power control step size ΔSTEP instead of ΔTPC. For detailedinformation, see 3.1.2.3 Downlink Inner-Loop Power Control. The ΔSTEP isdefined according to the following:

– The ΔSTEP = ΔRP-TPC during RPL (defined in 3.1.2.2 Uplink Inner-Loop PowerControl in Compressed Mode) timeslots after each transmission gap. ΔRP-TPC= min(3dB, 2ΔTPC).

– Otherwise, ΔSTEP = ΔTPC.

– When DL power control mode is set to TPC_TRIPLET_IN_SOFT, the sets oftimeslots over which the TPC commands are processed should remain aligned to theframe boundaries in the compressed frame. If this results in an incomplete set of TPCcommands, the UE should transmit the same TPC commands in all timeslots of theincomplete set.

l PSIR(k) is the kth power adjustment due to the downlink target SIR variation.

– For the DPCH, the power offset is calculated with the following formula:

PSIR(k) = δPcurr – δPprev

where:

– PSIR(k) is the power offset.

– δPcurr is the value of δP in the current timeslot.

– δPprev is the value of δP the most recently transmitted timeslot.

δP is calculated with the following formula:

δP = max(ΔP1_compression, ..., ΔPn_compression) + ΔP1_coding + ΔP2_codingwhere:

– n is the number of different TTI lengths amongst TTIs of all TrCHs of the CCTrCH.

– ΔP1_coding and ΔP2_coding are computed from the uplink parameters UE DeltaSIR1, UE Delta SIR2, UE Delta SIRAfter1, and UE Delta SIRAfter2 signaledby higher layers as:

– ΔP1_coding = UE Delta SIR1 if the start of the first transmission gap in thetransmission gap pattern is within the current frame.





– ΔP1_coding = UE Delta SIRAfter1 if the current frame just follows a framecontaining the start of the first transmission gap in the transmission gap pattern.

– ΔP2_coding = UE Delta SIR2 if the start of the second transmission gap in thetransmission gap pattern is within the current frame.

– ΔP2_coding = UE Delta SIRAfter2 if the current frame just follows a framecontaining the start of the second transmission gap in the transmission gappattern.

– ΔP1_coding = 0 dB and ΔP2_coding = 0 dB in all other cases.

– ΔPi_compression is defined as:– ΔPi_compression = 3 dB for downlink frames compressed by reducing the

spreading factor by 2.– ΔPi_compression = 0 dB in all other cases.

l For the F-DPCH, the power offset PSIR(k) = 0.

l Pbal(k) is a correction according to the downlink power control procedure for balancingradio link powers towards a common reference power.

Default Values of Parameters in Compressed ModeAssume that the following values of CM cell type are called cell type group 1:l WALKING_SPEED_AND_HOT_SPOT_CELL

l LOW_SPEED_AND_MEDIUM_COVERAGE_CELL

l LOW_SPEED_AND_HIGH_COVERAGE_CELL

l MID_SPEED_AND_HOT_SPOT_CELL

l PICO_NODEB_TYPE_COVERAGE_CELL

l OTHER_CELL

The following values of CM cell type are called cell type group 2:l HIGH_SPEED_AND_HOT_SPOT_CELL

l HIGH_SPEED_AND_MEDIUM_COVERAGE_CELL

l HIGH_SPEED_AND_HIGH_COVERAGE_CELL

Table 3-5 describes the parameters associated with each cell type group for downlink inner-looppower control in compressed mode.

Table 3-5 Downlink parameter configuration in compressed mode



CM method

CMMETHOD





RPP RPPA Mode 1 Mode 0



3-57



ITP ITPA Mode 1 Mode 1

UE Delta SIR1 UEDELTASIR1A 12 12

UE DeltaSIRAfter1

UEDELTASIRAFTER1A

6 6

UE Delta SIR2 UEDELTASIR2A 12 12

UE DeltaSIRAfter2

UEDELTASIRAFTER2A

6 6

Comparison Between Downlink Inner-Loop Power Control in Normal andCompressed Modes

Table 3-6 provides information on some of the similarities and differences of uplink inner-looppower control in normal and compressed modes.

Table 3-6 Comparison between downlink inner-loop power control in normal and compressedmodes

Equipment Normal Mode Compressed Mode

UE SIRest > SIRtarget, TPCcommand = "0"SIRest < SIRtarget, TPCcommand = "1"

SIRest > SIRcm_target, TPC command = 0

SIRest < SIRcm_target, TPC command = 1

SIRcm_target = SIRtarget + max(ΔSIR1_compression, ..., ΔSIRn_compression)+ ΔSIR1_coding + ΔSIR2_coding

NodeB P(k) = P(k–1) + PTPC(k) +Pbal(k)

P(k) = P(k–1) + PTPC(k) + PSIR(k) + Pbal(k)

PSIR(k) = δPcurr – δPprev

δP = max(ΔP1_compression, ...,ΔPn_compression) + ΔP1_coding +ΔP2_coding

3.1.3 Outer-Loop Power ControlThe outer-loop power control is a part of the closed-loop power control and the aim of outer-loop power control is to maintain the communication quality at the level required by the servicebearer through adjustment of the SIR target. This power control acts on each DCH belonging tothe same RRC connection.

The SIR target needs to be adjusted when the UE speed or the multi-path propagationenvironment changes, so that the communication quality can remain unaffected. If a fixed SIRtarget is selected, the resulting quality of the communication might be too low or too high, whichmay cause an unnecessary power rise.





The adjustment of the SIR target is based on BLER or Bit Error Rate (BER) according to thefollowing:

l When the power control algorithm switch OLPC_SWITCH is on:

– If there is data transfer in the uplink, the SRNC adjusts the SIR target based on theBLER.

– If there is no data transfer in the uplink, the SRNC adjusts the SIR target based on theBER.

l When the power control algorithm switch OLPC_SWITCH is off, the SIR target does nochange.

The OLPC_SWITCH is defined by the Power control algorithm switch parameter. Thisparameter is described in the following table:

Parameter Name Power control algorithm switch

Parameter ID PCSWITCH: OLPC_SWITCH

GUI Range 0, 1

Physical Range & Unit OFF, ON

Default Value 1


MML Command SET CORRMALGOSWITCH

Description When this switch is ON, the RNC updates the uplinkSIR target of RLs on the NodeB side by Iub DCH FPsignals.

3.1.3.1 Uplink Outer-Loop Power Control Based on BLERUplink Outer-Loop Power Control Based on BLER describes how to obtain the BLER targetand how to calculate the SIR target for this kind of power control.

3.1.3.2 Uplink Outer-Loop Power Control Based on BERUplink Outer-Loop Power Control Based on BER describes how to obtain the BER target andhow to calculate the SIR target for this kind of power control.

3.1.3.3 Downlink Outer-Loop Power ControlDownlink outer-loop power control is implemented in the UE. Therefore, this algorithm is UEmanufacturer specific.

Uplink Outer-Loop Power Control Based on BLER

Uplink Outer-Loop Power Control Based on BLER describes how to obtain the BLER targetand how to calculate the SIR target for this kind of power control.

The uplink quality is observed after macro diversity selection combining in the RNC. Therefore,uplink outer-loop power control is performed in the SRNC.



3-59

Procedure of Uplink Outer-Loop Power Control Based on BLERThe procedure of uplink outer-loop power control is as follows:

1. The SRNC compares the received BLER with the BLER target. If the received BLER islarger than the BLER target, the SRNC increases the SIR target; otherwise, the SRNCdecreases the SIR target. The SIR adjustment step parameter is used for increasing ordecreasing the SIR target.

2. After adjusting the SIR target, the SRNC sends the new SIR target through Frame Protocol(FP) frames to all NodeBs under the SRNC for uplink inner-loop power control.

Figure 3-4 describes the elements involved in the procedure.

Figure 3-4 Uplink outer-loop power control

The SIR adjustment step parameter is described in the following table:

Parameter Name SIR adjustment step

Parameter ID SIRADJUSTSTEP

GUI Range 0 to 10000




MML Command ADD TYPSRBOLPC/MOD TYPSRBOLPC/ADDTYPRABOLPC/MOD TYPRABOLPC

Description This parameter specifies the adjustment step of SIR target usedby the outer-loop power control algorithm.






If the value of BLER target value changes, the value of the SIR adjustment step parametermust change synchronously. For the same SRB or TRB, assume that the default values ofBLER target value and SIR adjustment step before change are BLERquality1 andSirAdjustStep1 respectively, and those after the change are BLERquality2 andSirAdjustStep2. Then, BLERquality1, SirAdjustStep1, BLERquality2, and SirAdjustStep2must fulfill the following requirement:(1 – BLERquality1) x SirAdjustStep1 / BLERquality1 = (1 – BLERquality2) xSirAdjustStep2 / BLERquality2

The uplink outer-loop power control for all UEs can be deactivated by setting OLPC_SWITCHof the Power control algorithm switch parameter to OFF.

The uplink outer-loop power control for different services can be deactivated by setting the SIRadjustment step parameter to 0.

Initial SIR Target SettingThe initial SIR target value is provided by the RNC to the NodeB through the SIR init targetvalue parameter which is service-dependent. This value is transmitted to the NodeB by usingNBAP signaling of each RADIO LINK SETUP or RADIO LINK RECONFIGURATIONPREPARE messages. The SIR init target value parameter is described in the following table:

Parameter Name SIR init target value

Parameter ID INITSIRTARGET

GUI Range 0 to 255

Physical Range & Unit–8.2 to 17.3step: 0.1Unit: dB




Description This parameter defines the initial SIR target value ofouter-loop power control algorithm.Value 0 corresponds to –8.2 dB, value 10 to –7.2 dB,and value 255 to 17.3 dB.



3-61


For the same SRB or TRB, the values of SIR init target value, Maximum SIR target, andMinimum SIR target must fulfill the following requirement: Minimum SIR target ≤ SIRinit target value ≤ Maximum SIR target.

The Maximum SIR target and Minimum SIR target parameters are described in the followingtables:

Parameter Name Maximum SIR target

Parameter ID MAXSIRTARGET

GUI Range 0 to 255

Physical Range & Unit–8.2 to 17.3Step: 0.1Unit: dB




Description This parameter defines the maximum SIR target value of outer-loop power control algorithm.Value 0 corresponds to –8.2 dB, value 10 to –7.2 dB, and value255 to 17.3 dB.

Parameter Name Minimum SIR target

Parameter ID MINSIRTARGET

GUI Range 0 to 255

Physical Range & Unit–8.2 to 17.3Step: 0.1Unit: dB








Description This parameter defines the minimum SIR target value of outer-loop power control algorithm.Value 0 corresponds to –8.2 dB, value 10 to –7.2 dB, and value255 to 17.3 dB.

Adjusting the SIR TargetThe outer-loop power control adjusts the SIR target in the period specified by the OLPCadjustment period parameter, which is described in the following table:

Parameter Name OLPC adjustment period

Parameter ID SIRADJUSTPERIOD

GUI Range 1 to 100

Physical Range & Unit10 to 1000Step: 10Unit: ms

Default Value 40



Description Outer-loop power control varies with radio environment. A fasterchanging radio environment needs a shorter outer-loop powercontrol adjustment period, while a slower changing one makesthe period longer.

The SIR target is calculated with the following formula:

where:

l n is the nth adjustment period.

l SIRtar(n) is the SIR target used in the nth adjustment period which can be defined by theOLPC adjustment period parameter.

l i is the ith transport channel.

l BLERmeas(n,i) is the instantaneous BLER measured for the ith transport channel in the nthadjustment period. The BLERmeas(n,i) is calculated with the following formula:



3-63

where:– Tb(n,i) is the number of all blocks received the TBs received from the ith transport

channel in the nth adjustment period.– ErrTb(n,i) is the number of error blocks indicated by the CRCI in the Tb(n,i) that is

received from the ith transport channel.l BLERtar(i) is the BLER target of the ith transport channel, which could be defined by the

Target value of signalling DCH_BLER or Service DCH_BLER target value parameter.l Step(i) is the adjustment step of the ith transport channel, which could be defined by the

SIR adjustment step parameter.l Factor refers to the adjustment factor which could be defined by the SIR adjustment

coefficient parameter.l MAX is the maximum value in the total i transport channels.

The Target value of signalling DCH_BLER, Service DCH_BLER target value, and SIRadjustment coefficient parameters are described in the following tables:

Parameter Namel Target value of signalling DCH_BLER

l Service DCH_BLER target value

Parameter ID BLERQUALITY


Physical Range & Unit 5 x 10^(–7) to 1




Description If signaling is carried over DCH, these parameters indicate thetarget transmission quality of DCH, that is, DCH BLER targetvalue at the radio interface. These parameters are related to QoSand are used by the CRNC to determine the SIR target foradmission and power management. Use the following formula toget the integer value of each parameter: 10 x Log10(BLER).

Parameter Name SIR adjustment coefficient

Parameter ID SIRADJUSTFACTOR

GUI Range 1 to 10

Physical Range & Unit0.1 to 1Step: 0.1

Default Value 10






MML Command SET OLPC/ADD CELLOLPC/MOD CELLOLPC

Description This parameter is used to adjust the best OLPC step when theOLPC algorithm is given.

The principles for adjusting the SIR target in case of multi-services are as follows:

l The maximum value of SIR target among multiple services is used for the SIR targetadjustment.

l If one of the services requires increase in the SIR target, the reconfigured SIR target cannotexceed that maximum value.

l The maximum value can only be decreased when all the services require decrease in theSIR target.

SIR Target Adjustment Limitation

The service-dependent parameters Maximum SIR increase step and Maximum SIR decreasestep limit the changes to the SIR target during any adjustment. The limitation is calculated withthe following formula:

ΔSIRtar = SIRtar(n+1) – SIRtar(n)

l If (ΔSIRtar > 0) and (ΔSIRtar > maximum SIR increase step), then SIRtar(n+1) = SIRtar(n)+ maximum SIR increase step.

l If (ΔSIRtar < 0) and (ABS(ΔSIRtar) > maximum SIR decrease step), then SIRtar(n+1) =SIRtar(n) – maximum SIR decrease step.

The Maximum SIR increase step and Maximum SIR decrease step parameters aredescribed in the following tables:

Parameter Name Maximum SIR increase step

Parameter ID MAXSIRSTEPUP






Description This parameter specifies the maximum allowed SIR step-up within an outer-loop power control adjustment period.



3-65

Parameter Name Maximum SIR decrease step

Parameter ID MAXSIRSTEPDN






Description This parameter specifies the maximum allowed SIR step-down within an outer-loop power control adjustmentperiod.

Table 3-7 describes the BLER-based outer-loop power control parameters on RAB basis.

Table 3-7 Parameters of BLER-based outer-loop power control on RAB basis

Service

Service

DCH_BLERtargetvalue

SIRinit

targetvalue

MaximumSIR

target

MinimumSIR

target

OLPCadjustment

period

SIRadjustmentstep

MaximumSIR

increase step

MaximumSIR

decrease step

SRB3.4kbit/s

–20 102 132 62 4 4 400 200

SRB13.6kbit/s

–20 122 132 62 2 10 500 200

AMR12.2kbit/s

–20 102 132 62 2 5 500 200

CSD 64kbit/s –27 122 152 62 2 2 1000 100

PS I/B8 kbit/s –20 102 132 62 4 4 400 200

PS I/B16 kbit/s

–20 102 132 62 2 4 400 200





Service

Service

DCH_BLERtargetvalue

SIRinit

targetvalue

MaximumSIR

target

MinimumSIR

target

OLPCadjustment

period

SIRadjustmentstep

MaximumSIR

increase step

MaximumSIR

decrease step

PS I/B32 kbit/s

–20 102 132 62 2 4 400 200

PS I/B64 kbit/s

–20 102 132 62 2 4 400 200

PS I/B128kbit/s

–20 102 132 62 2 4 400 200

PS I/B144kbit/s

–20 107 137 62 2 4 400 200

PS I/B256kbit/s

–20 122 152 62 2 4 400 200

PS I/B384kbit/s

–20 142 172 62 2 4 400 200

NOTE

l CSD: CS data services.

l I/B: Interactive and Background.

Uplink Outer-Loop Power Control Based on BER

Uplink Outer-Loop Power Control Based on BER describes how to obtain the BER target andhow to calculate the SIR target for this kind of power control.

Obtaining BER Target

In an optimal condition, the BER target is the BER average value within the adjustment period.The BER target is obtained before the Discontinuous Transmission (DTX) period starts. Thatis, the BER nearest to the DTX period. If it is impossible to obtain the BER target, only thetypical value can be used. The BER target is calculated with the following formula:

where:



3-67

l F(n) is the average BER value after filtering.

l a is the filter coefficient which can be set through the DTX BER target filter coefficientor None DTX BER target filter coefficient parameter.

l F(n–1) is the last average BER value after filtering, that is, the last filtering value.

l M(n) is the current BER value.

The DTX BER target filter coefficient and None DTX BER target filter coefficientparameters are described in the following table:

Parameter Namel DTX BER target filter coefficient

l None DTX BER target filter coefficient

Parameter IDl DTXBERTARFILTERCOEF

l NONDTXBERTARFILTERCOEF

GUI Rangel 0 to 10000

l 0 to 10000

Physical Range & Unitl 0 to 1; step: 0.001

l 0 to 1; step: 0.001

Default Value None



Description

The first parameter is used to filter the BER target on theDPCCH during the DTX period. The second parameter is usedto filter the BER target on the DPCCH during the non-DTXperiod.

The average BER value is obtained during the outer-loop power control period and that the initialvalue is the configured BER target. If n is the value in the non-DTX period and n+1 is the valuein the DTX period, the target value of n+1 is F(n) and the outer-loop power control is based onBER. During soft handover, the system BER target is the minimum value of the link among allthe links. When BLER is a constant, the BER on the DPCCH can vary within a limited range.

Calculating SIR Target

Assume that the BERs reported by the frames are BER1, BER2, ..., and BERN, in such case theaverage value is calculated with the following formula:

BERm = (BER1 + ... + BERN)/N

l When BERm > BER target + BER target 1, the SIR target is increased by Δ1. BER target1 is set through the BER target value upper threshold parameter and Δ1 is set throughthe BER based SIR up step length parameter.





l When BERm < BER target – BER target 2, the SIR target is decreased by Δ2. BER target2 is set through the BER target value lower threshold parameter and Δ2 is set throughthe BER based SIR down step length parameter.

Similar to BER target 1 and BER target 2, Δ1 and Δ2 are algorithm parameters notified to theMAC by the RRC.

The parameters used to calculate the SIR target are described in the following tables:

Parameter Namel BER target value upper threshold

l BER target value lower threshold

Parameter IDl BERTARGET1

l BERTARGET2


l 0 to 10000


l 0 to 10; step: 0.0001

Default Value None


MML Command

ADD TYPSRBOLPCMOD TYPSRBOLPCADD TYPRABOLPCMOD TYPRABOLPC

Description

For outer-loop power control based on the BER on the DPCCH,the SIR target is increased when the measured BER value ishigher than the sum of target value and upper limit (upper limitof BER target). The SIR target is decreased when the measuredBER is lower than the difference between target value andlower limit (lower limit of BER target).

Parameter Namel BER based SIR up step length

l BER based SIR down step length

Parameter IDl SIRSTEPUPONBER

l SIRSTEPDOWNONBER


l 0 to 10000


l 0 to 10; step: 0.001



3-69

Default Value None


MML Command

ADD TYPSRBOLPCMOD TYPSRBOLPCADD TYPRABOLPCMOD TYPRABOLPC

DescriptionThese parameters specify the step up/down on the SIR targetof the outer-loop power control algorithm based on the BERon the DPCCH.

Table 3-8 describes the BER-based outer-loop power control parameters on RAB basis.

Table 3-8 Parameters of BER-based outer-loop power control on RAB basis

Service

Non-DTXBER

TargetFilter

Coefficient

DTX BERTargetFilter

Coefficient

BERTarget

1

BERTarget

2

SIRStep UPon BER(Unit:

dB)

SIR StepDown

on BER(Unit:

dB)

SRB 3.4 kbit/s 800 0 0 0 0 0

SRB 13.6 kbit/s 800 0 0 0 0 0

AMR 12.2 kbit/s 800 0 0 0 0 0

CSD 64 kbit/s 800 0 0 0 0 0

PS I/B 8 kbit/s 800 0 0 0 0 0

PS I/B 16 kbit/s 800 0 0 0 0 0

PS I/B 32 kbit/s 800 0 0 0 0 0

PS I/B 64 kbit/s 800 0 0 0 0 0

PS I/B 128 kbit/s 800 0 0 0 0 0

PS I/B 144 kbit/s 800 0 0 0 0 0

PS I/B 256 kbit/s 800 0 0 0 0 0

PS I/B 384 kbit/s 800 0 0 0 0 0





NOTE

l CSD: CS data services.

l I/B: Interactive and Background.

When there are multiple transport channels, the MAC can obtain the BER on the DPCCH fromseveral frames. Assume that the BER on the DPCCH is obtained from the frames on any channelon which the BLER is measured.

Downlink Outer-Loop Power ControlDownlink outer-loop power control is implemented in the UE. Therefore, this algorithm is UEmanufacturer specific.

The information signaled to the UE by the RNC is a quality target for each radio bearer, expressedas a BLER target. Then, depending on the manufacturer specific outer-loop power controlalgorithm, an initial SIR target value can be deduced from this BLER value.

The BLER target quality is configurable per RAB, as defined by the Target value of signallingDCH_BLER or Service DCH_BLER target value parameter.

3.1.4 Downlink Power BalancingDownlink power balancing is used to reduce power drift between downlink radio links in softor softer handover.

Procedure of Downlink Power BalancingDuring soft handover, the uplink TPC command is demodulated in each radio link set. Due todemodulation errors, the downlink transmit power of each branch drifts separately, which causesloss to the macro-diversity gain.

During softer handover, the power among all branches may drift because of initial powerdifference.

The Downlink Power Balance (DPB) algorithm is introduced to reduce the power drift betweenlinks when the UE is in soft or softer handover.



3-71

Figure 3-5 Downlink power balancing

The implementation of the DPB algorithm is as follows:

1. The NodeB reports the transmitted code power of each radio link in soft or softer handoverto the RNC.

2. For UEs on softer handover, the RNC evaluates the power difference of the radio links andstarts or stops downlink power balancing. For UEs in soft handover, the RNC always startsdownlink power balancing.

3. The RNC calculates the downlink reference power Pref and transmits the Pref to the NodeBthrough the DOWNLINK POWER CONTROL REQUEST message.

4. The NodeB calculates the transmitted code power on each radio link.

5. If necessary, the NodeB adjusts the transmitted code power.

Reporting the Transmitted Code Power

According to measurement control from the RNC, the NodeB periodically reports the transmittedcode power of each radio link in soft or softer handover. The measurement parameters includethe DPB measurement report period parameter, and the DPB measurement filtercoefficient parameter. These parameters are described in the following tables:

Parameter Name DPB measurement report period

Parameter ID RPTPERIOD

GUI Range 1 to 6000

Physical Range & Unit10 to 60000Step: 10Unit: ms





Default Value 70


MML Command SET DPB

Description This parameter specifies the reporting period of downlinkpower measurement.

Parameter Name DPB measurement filter coefficient

Parameter ID DPBMEASFILTERCOEF

GUI Range D0, D1, D2, D3, D4, D5, D6, D7, D8, D9, D11, D13, D15,D17, D19

Physical Range & Unit 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 17, 19

Default Value 0


MML Command SET DPB

Description This parameter specifies the filter coefficient for themeasured values in the NodeB.

Evaluating the Power Difference

For UEs in softer handover, after receiving the transmitted code power, the RNC evaluates thepower difference of the radio links and decides whether to start or stop downlink power balancingaccording to the following:

l If the power difference is greater than the value of the DPB triggering threshold parameter,the RNC starts power balancing.

l If the power difference is smaller than the value of the DPB stop threshold parameter, theRNC stops power balancing.

For UEs in soft handover, downlink power balancing is always triggered.

The parameters used for evaluating the power difference are described in the following tables:

Parameter Name DPB triggering threshold

Parameter ID DPBSTARTTHD

GUI Range 0 to 255

Physical Range & Unit0 to 127.5Step: 0.5Unit: dB



3-73

Default Value 8


MML Command SET DPB

Description This parameter specifies the threshold of triggeringdownlink power balancing in softer handover. When thedifference of the power values of every two radio links insofter handover is greater than, or equal to this threshold,the RNC triggers downlink power balancing; otherwise,the RNC does not.

Parameter Name DPB stop threshold

Parameter ID DPBSTOPTHD

GUI Range 0 to 255

Physical Range & Unit0 to 127.5Step: 0.5Unit: dB

Default Value 4


MML Command SET DPB

Description This parameter specifies the threshold of stoppingdownlink power balancing in softer handover. When thedifference of the power values of every two radio links insofter handover is smaller than, or equal to this threshold,the RNC stops downlink power balancing; otherwise, theRNC does not.

Calculating the UE Downlink Reference Power

The downlink reference power is calculated with the following formula:

Pref = Ratio for max power/100 x (Pmax – Pcpich, max) + (1 – Ratio for max power/100) x(Pmin – Pcpich, min)

where:

l Pref is the downlink reference power.

l Pmax is the maximum value in all the downlink transmitted code power of the UE radiolink.

l Pcpich, max is the P-CPICH power value of the cell that has the highest downlink transmittedcode power among all the UE radio links.





l Pmin is the minimum value in all the downlink transmitted code power of the UE radio link.

l Pcpich, min is the P-CPICH power value of the cell that has the lowest downlink transmittedcode power among all the UE radio links.

l Ratio for max power is a weighting parameter of the maximum power. This parameter isdescribed in the following table:

Parameter Name Ratio for max power

Parameter ID RATIOFORMAXPOWER

GUI Range 0 to 100

Physical Range & Unit0 to 1Step: 0.01

Default Value 50


MML Command SET DPB

Description This parameter specifies the weight of the maximumpower during calculation of the reference power forDPB.

The DOWNLINK POWER CONTROL REQUEST message contains the DPB adjustmentratio, DPB adjustment period, and Max DPB adjustment step parameters. These parametersare described in the following tables:

Parameter Name DPB adjustment ratio

Parameter ID ADJUSTRATIO

GUI Range 0 to 100

Physical Range & Unit0 to 1Step: 0.01

Default Value 0


MML Command SET DPB

Description This parameter specifies the adjustment ratio for DPB.

Parameter Name DPB adjustment period

Parameter ID ADJUSTPERIOD

GUI Range 1 to 256




3-75

Default Value 2


MML Command SET DPB

Description This parameter specifies the DPB adjustment period inframes.

Parameter Name Max DPB adjustment step

Parameter ID MAXADJUSTSTEP

GUI Range 1 to 10

Physical Range & Unit Slot

Default Value 4


MML Command SET DPB

Description During downlink power adjustment, the maximumadjustment step should not exceed 1 dB within thetimeslots specified by this parameter.

Calculating the Transmitted Code Power

The transmitted code power is calculated with the following formula:

P(i) = P(i–1) + PTPC(i) + Pbal(i)

where:

l P(i) is the transmitted code power of timeslot i.

l P(i–1) is the transmitted code power of timeslot (i–1).

l PTPC is the result of inner-loop power control.

l Pbal is a corrective term introduced by downlink power balancing.

In one DPB adjustment period, the total power correction is calculated with the followingformula:

where:

l Pbal is the total power correction.

l r is DPB adjustment ratio





l Pref is the downlink reference power. For detailed information on the Pref, see Calculatingthe UE Downlink Reference Power.

l PP-CPICH is the P-CPICH transmit power in a cell. It is defined by the PCPICH transmitpower parameter. For detailed information on the parameter, see 3.1.1.1 Uplink Open-Loop Power Control on PRACH.

l Pinit is the transmitting power of a radio link before adjustment.

In a certain number of timeslots, the total adjustment must not be greater than 1 dB. The numberof timeslots are defined by the Max DPB adjustment step parameter. The implementation atthe NodeB is as follows:

The adjustment step is a fixed value of 0.25 dB.l If the Max DPB adjustment step parameter is smaller than, or equal to 4 timeslots, then

0.25 dB adjustment in each timeslot will be made. The total adjustment is 1 dB.l Otherwise, for example, if the downlink power balancing adjustment step is equal to 5

timeslots, the NodeB will make 0.25 dB adjustment in each of the former four timeslotsand make no adjustment in the fifth timeslot. The total adjustment is 1 dB.

The total power adjustment value must be a multiple of 0.25. The following rule is used to round-up the value:

Round(ΔP/0.25) x 0.25

3.2 HSDPA Power ControlHSDPA Power Control describes the power control of HSDPA on physical channels, includingHS-DPCCH, and HS-SCCH.

3.2.1 Power Control of HS-DPCCHThe power of HS-DPCCH is set by several power offsets between the HS-DPCCH and theassociated UL DPCCH. When ACK/NACK and CQI are carried on the HS-DPCCH, their poweroffsets, namely ΔACK, ΔNACK, and ΔCQI, are set at each HS-DPCCH TTI.

3.2.2 Power Control of HS-SCCHPower of HS-SCCH can be fixed to a offset relative to the P-CPICH power or can be dynamicallycontrolled based on CQI.

3.2.1 Power Control of HS-DPCCHThe power of HS-DPCCH is set by several power offsets between the HS-DPCCH and theassociated UL DPCCH. When ACK/NACK and CQI are carried on the HS-DPCCH, their poweroffsets, namely ΔACK, ΔNACK, and ΔCQI, are set at each HS-DPCCH TTI.



3-77

Figure 3-6 Power control on HS-DPCCH

l The CQI feedback in the uplink is determined by the following parameters: CQI RepetitionFactor, CQI Power Offset, and CQI feedback cycle. Figure 3-6 shows the relationshipbetween them.CQI feedback cycle refers to the cycle of UE providing CQI feedback. In each cycle, theCQI is repeatedly sent within the CQI Repetition Factor consecutive subframes.In each subframe, the CQI transmission power is equal to the associated UL DPCCH powerplus the power offset of CQI.

l The NACK/ACK feedback in the uplink is determined by the following parameters: ACK-NACK Repetition Factor, ACK/NACK poweroffset, and the HS-DPCCH PreambleTransmission Indication.At the end of about 19,200 chips after the UE receives HS-PDSCH subframes in thedownlink, the UE provides HARQ NACK or ACK feedback in the uplink within ACK-NACK Repetition Factor consecutive HS-DPCCH subframes.The transmit power of the UE is equal to the associated UL DPCCH transmit power plusthe ACK Poweroffsetor NACK Poweroffset, for NACK or ACK feedback respectively.

This version of RAN supports HS-DPCCH preamble. That is, a preamble and a postamble aretransmitted before and after the NACK/ACK feedback respectively. Thus, the ACK/NACKdecoding reliability is enhanced, and the transmit power of the first timeslot of the HS-DPCCHsubframe can decrease so as to reduce the interference in the uplink. The following figure showsan example. In this example, the HS-DPCCH supports preamble, and ACK-NACK RepetitionFactor is 1. When preamble is supported, the power offset of ACK or NACK can be changedto a lower level than that when preamble is not supported.





Figure 3-7 Preamble and postamble of HS-DPCCH

Several power offsets are set between the HS-DPCCH and the associated UL DPCCH. WhenACK/NACK and CQI are carried on the HS-DPCCH, their power offsets, that is, ΔACK,ΔNACK, and ΔCQI, are set in one HS-DPCCH TTI.

The transmit power of the HS-DPCCH is calculated with the following formula:

PHS-DPCCH = PUL DPCCH x 10ΔHS-DPCCH/10

wherel PUL DPCCH is the transmit power of the associated UL DPCCH.

l For the first slot of a TTI, ΔHS-DPCCH means ΔACK when the UE responds with ACKor means ΔNACK when the UE responds with NACK.

l For the second and third slots of a TTI, ΔHS-DPCCH means ΔCQI.

During a soft handover (SHO), the UL combining gain reduces the necessary transmit power ofthe UL DPCCH. The HS-DPCCH does not have the UL combining gain to maintain its receivingquality, so that higher power offset is required. When the UE enters or leaves the soft handoverstate, the power offset of ACK/NACK and CQI may change accordingly.

Setting of the HS-DPCCH Power OffsetThe power offset is related to the number of links in a Radio Link Set (RLS), the repetitionfactor, and the power offset of ACK/NACK. The more links a UE in SHO state has, the largerthe power offset should be set. That is because the HS-DPCCH, unlike the UL DPCCH, doesnot have the SHO gain. The greater the repetition factor is, the smaller the power offset shouldbe set. That is because repetitions enhance the receiving reliability. For power offset of ACK/NACK, the transmit power can be lowered if HS-DPCCH preamble is supported. The NACK/ACK power offset parameters on the LMT are designed on the basis that HS-DPCCH preambleis not supported.

The following parameters determine the values of ΔACK, ΔNACK, and ΔCQI in a non-SHO andan SHO state.



3-79

Parameter Name

ACK poweroffset1ACK poweroffset2ACK poweroffset3

Parameter ID

ACKPO1, ACKPO2, ACKPO3l ACKPO1 is for the UEs whose minimum inter-TTI interval

is one, that is, the UEs can respond with one ACK or NACKevery TTI.

l ACKPO2 is for the UEs whose minimum inter-TTI intervalis two, that is, the UEs can respond with one ACK or NACKat least every two TTIs. Therefore, in the two TTIs, the UEscan repeat the same ACK or NACK.

l ACKPO3 is for the UEs whose minimum inter-TTI intervalis three, that is, the UEs can respond with one ACK orNACK at least every three TTIs. Therefore, in the threeTTIs, the UEs can repeat the same ACK or NACK.

GUI RangePO_5/15, PO_6/15, PO_8/15, PO_9/15, PO_12/15,PO_15/15, PO_19/15, PO_24/15, PO_30/15

Physical Range and Unit 5/15, 6/15, 8/15, 9/15, 12/15, 15/15, 19/15, 24/15, 30/15

Default Value

PO_24/15 (24/15) for ACK poweroffset1PO_12/15 (12/15) for ACK poweroffset2PO_9/15 (9/15) for ACK poweroffset3


MML Command ADD CELLHSDPCCH

Description Each parameter specifies the power offset of ACK relative tothe uplink DPCCH power in a non-SHO state.

Parameter Name

ACK poweroffset1 multi-RLSACK poweroffset2 multi-RLSACK poweroffset3 multi-RLS





Parameter ID

ACKPO1FORSHO, ACKPO2FORSHO, ACKPO3FORSHOl ACKPO1FORSHO is for the UEs whose minimum inter-

TTI interval is one, that is, the UEs can respond with oneACK or NACK every TTI.

l ACKPO2FORSHO is for the UEs whose minimum inter-TTI interval is two, that is, the UEs can respond with oneACK or NACK at least every two TTIs. Therefore, in thetwo TTIs, the UEs can repeat the same ACK or NACK.

l ACKPO3FORSHO is for the UEs whose minimum inter-TTI interval is three, that is, the UEs can respond with oneACK or NACK at least every three TTIs. Therefore, in thethree TTIs, the UEs can repeat the same ACK or NACK.



Default Value

PO_24/15 (24/15) for ACK poweroffset1 multi-RLSPO_24/15 (24/15) for ACK poweroffset2 multi-RLSPO_24/15 (24/15) for ACK poweroffset3 multi-RLS



Description Each parameter specifies the power offset of ACK relative tothe uplink DPCCH power in an SHO state.

Parameter Name

NACK poweroffset1NACK poweroffset2NACK poweroffset3

Parameter ID

NACKPO1, NACKPO2, NACKPO3l NACKPO1 is for the UEs whose minimum inter-TTI

interval is one, that is, the UEs can respond with one ACKor NACK every TTI.

l NACKPO2 is for the UEs whose minimum inter-TTIinterval is two, that is, the UEs can respond with one ACKor NACK at least every two TTIs. Therefore, in the twoTTIs, the UEs can repeat the same ACK or NACK.

l NACKPO3 is for the UEs whose minimum inter-TTIinterval is three, that is, the UEs can respond with one ACKor NACK at least every three TTIs. Therefore, in the threeTTIs, the UEs can repeat the same ACK or NACK.




3-81


Default Value

PO_24/15 (24/15) for NACK poweroffset1PO_12/15 (12/15) for NACK poweroffset2PO_9/15 (9/15) for NACK poweroffset3



Description Each parameter specifies the power offset of NACK relativeto the uplink DPCCH power in a non-SHO state.

Parameter Name

NACK poweroffset1 multi-RLSNACK poweroffset2 multi-RLSNACK poweroffset3 multi-RLS

Parameter ID

NACKPO1FORSHO, NACKPO2FORSHO,NACKPO3FORSHOl NACKPO1FORSHO is for the UEs whose minimum inter-


l NACKPO2FORSHO is for the UEs whose minimum inter-TTI interval is two, that is, the UEs can respond with oneACK or NACK at least every two TTIs. Therefore, in thetwo TTIs, the UEs can repeat the same ACK or NACK.

l NACKPO3FORSHO is for the UEs whose minimum inter-TTI interval is three, that is, the UEs can respond with oneACK or NACK at least every three TTIs. Therefore, in thethree TTIs, the UEs can repeat the same ACK or NACK.



Default Value

PO_24/15 (24/15) for NACK poweroffset1 multi-RLSPO_24/15 (24/15) for NACK poweroffset2 multi-RLSPO_24/15 (24/15) for NACK poweroffset3 multi-RLS



Description Each parameter specifies the power offset of NACK relativeto the uplink DPCCH power in an SHO state.





Parameter Name CQI Power Offset

Parameter ID

CQIPONote:CQIPO is for all UEs regardless of the minimum inter-TTIinterval.



Default Value PO_24/15 (24/15)



Description This parameter specifies the power offset of CQI relative tothe uplink DPCCH power in a non-SHO state.

Parameter Name CQI Power Offset multi-RLS

Parameter ID

CQIPOFORSHONote:CQIPOFORSHO is for all UEs regardless of the minimuminter-TTI interval.



Default Value PO_24/15 (24/15)



Description This parameter specifies the power offset of CQI relative tothe uplink DPCCH power in an SHO state.

Parameter Name HARQ Preamble capability indication

Parameter ID HsdpcchPreambleSwitch

GUI Range Mode0, Mode1

Physical Range and Unit None



3-83

Default Value Mode0 (To perform the HS-DPCCH preamble function, theUE must support the function. Because not all UEs supportHS-DPCCH preamble, the switch is off by default.)


MML Command ADD CELLHSDPA

Description This parameter specifies whether the related cell supports HS-DPCCH preamble.

Setting the Repetition FactorsRepetition factors of ACK/NACK and CQI are signaled to the UE and the NodeB from higherlayers.

The UE does not attempt to receive or decode transport blocks from the HS-DSCH subframesduring the UE ACK or NACK retransmission. The setting of the ACK/NACK repetition factorsis related to the minimum inter-TTI interval of the UE.

Although a large CQI repetition factor helps enhance the CQI receiving reliability, CQI feedbackdelay also increases. Therefore, it is recommended that the CQI repetition factor be set to 1 andthe CQI power offset be set to a proper value to guarantee the receiving reliability.

Parameter Name

ACK-NACK Repetition Factor 1ACK-NACK Repetition Factor 2ACK-NACK Repetition Factor 3

Parameter ID

ACKNACKREF1, ACKNACKREF2, ACKNACKREF3,l ACKNACKREF1 is for the UEs whose minimum inter-


l ACKNACKREF2 is for such UEs whose minimum inter-TTI interval is two, that is, the UEs can respond with oneACK or NACK at least every two TTIs. Therefore, in thetwo TTIs, the UEs can repeat the same ACK or NACK.

l ACKNACKREF3 is for the UEs whose minimum inter-TTI interval is three, that is, the UEs can respond with oneACK or NACK at least every three TTIs. Therefore, in thethree TTIs, the UEs can repeat the same ACK or NACK.

GUI Range 1 to 4

Physical Range and Unit1 to 4Unit: times

Default Value

1 for ACK-NACK Repetition Factor 12 for ACK-NACK Repetition Factor 23 for ACK-NACK Repetition Factor 3







Description This parameter specifies the transmission times of the sameACK/NACK when the UE is in non-SHO.

Parameter Name ACK-NACK Repetition Factor multi-RLS

Parameter ID

ACKNACKREFFORSHONote:ACKNACKREFFORSHO is for all UEs regardless of theminimum inter-TTI interval.

GUI Range 1 to 4


Default Value 1



Description This parameter specifies the transmission times of the sameACK/NACK when the UE is in SHO.

Parameter Name CQI Repetition Factor

Parameter ID

CQIREFNote:CQIREF is for all UEs regardless of the minimum inter-TTIinterval.

GUI Range 1 to 4


Default Value 1



Description This parameter specifies the transmission times of the sameCQI when the UE is in non-SHO.



3-85

Parameter Name CQI Repetition Factor multi-RLS

Parameter ID

CQIREFFORSHONote:CQIREFFORSHO is for all UEs regardless of the minimuminter-TTI interval.

GUI Range 1 to 4


Default Value 1



Description This parameter specifies the transmission times of the sameCQI when the UE is in SHO.

Setting the CQI Feedback CycleThe CQI feedback cycle is signaled to the UE and the NodeB from higher layers.

The UE does not support the following cases:l CQI Feedback Cycle k < CQI Repetition Factor x 2

l CQI Feedback Cycle k multi-RLS < CQI Repetition Factor multi-RLS x 2

A long CQI feedback cycle helps reduce the uplink load and interference introduced by the CQIfeedback, but it also leads to the failure of the network to trace the channel quality in time.Therefore, the setting of the CQI feedback cycle should take both the effects into consideration.

Parameter Name CQI Feedback Cycle k

Parameter ID CQIFBCK

GUI Range D0, D2, D4, D8, D10, D20, D40, D80, D160

Physical Range and Unit0, 2, 4, 8, 10, 20, 40, 80, 160Unit: ms

Default Value D2 (2 ms)



Description In each CQI feedback cycle, the UE retransmits the CQI forN times, where N represents the value of CQI repetitionfactor. The value 0 indicates that no CQI information is sentfrom the UE.





Parameter Name CQI Feedback Cycle k multi-RLS

Parameter ID CQIFBCKFORSHO

GUI Range D0, D2, D4, D8, D10, D20, D40, D80, D160

Physical Range and Unit0, 2, 4, 8, 10, 20, 40, 80, 160Unit: ms

Default Value D2 (2 ms)



Description This parameter specifies the CQI feedback cycle duringwhich the UE retransmits the CQI, when the UE is in SHO.If the cycle is set to 0 ms, the UE does not transmit the CQI.

3.2.2 Power Control of HS-SCCHPower of HS-SCCH can be fixed to a offset relative to the P-CPICH power or can be dynamicallycontrolled based on CQI.

l Fixed power control: The transmit power of the HS-SCCH is fixed without considerationof the channel quality but with consideration of the receiving quality of users in the edgeof cells.

l Dynamic power control (based on CQI/ACK/NACK/DTX): The transmit power of the HS-SCCH is dynamic, and the Frame Error Rate (FER) of the HS-SCCH close to the targetvalue. Thus, the downlink resource efficiency is improved.

Dynamic Power Control (Based on CQI)

If the HS-SCCH Power Control Method parameter is set to CQI, the NodeB adjusts thetransmit power of the HS-SCCH based on the following information:

l CQI reported by the UE

l DTX detected by the NodeB

l Target FER of the HS-SCCH

The process of power control adjustment within an adjustment period is as follows:

1. NodeB acquires the PHS-SCCH,init, PHS-SCCH,min and PHS-SCCH,max according to the reportedCQI.

l PHS-SCCH,Init is the initial HS-SCCH transmit power, which is an offset relative to theP-CPICH transmit power.

l PHS-SCCH,min is the minimum HS-SCCH transmit power, which is an offset relative tothe P-CPICH transmit power. PHS-SCCH,min is set to –10 dB.

l PHS-SCCH,max is the maximum HS-SCCH transmit power, which is an offset relative tothe P-CPICH transmit power.



3-87

CQI PHS-SCCH,Init (dB) PHS-SCCH,max (dB)

1 to 8 0 0

9 to 11 –3 –3

12 to 14 –5 –5

15 to 24 –8 –8

25 to 30 –10 –10

2. NodeB calculates the HS-SCCH power for the Nth scheduling period by using the followingformula:

PHS-SCCH(n) = FUNC(PHS-SCCH(n-1), CQI(n-1), CQI(n), NDTX, Cpc, FERT, Sbase, Smax,u)

where:

l Cpc is the HS-SCCH power adjustment period, indicating the number of transmittedHS-SCCH frames. After the period, the power adjustment is performed at once. Cpc isset to 3 TTI.

l Sbase is the step of power adjustment within an HS-SCCH power adjustment period.Sbase is set to 0.02 dB.

l Smax,u is the maximum allowed power step-up within a power adjustment period.Smax,u is set to 0.5 dB.

l NDTX is the number of DTXs.

l FERT represents HS-SCCH FER and can be set on the NodeB LMT.

3. NodeB limits the HS-SCCH power for the Nth schedule time by PHS-SCCH,min and PHS-

SCCH,max. That is, limit the HS-SCCH power in the range [PHS-SCCH,min, PHS-SCCH,max].

Setting the Power Control Method

The power control method is defined by the HS-SCCH Power Control Method parameter ofthe SET MACHSPARA command.

The HS-SCCH Power Control Method parameter can be set on the NodeB LMT. The followingtable describes the parameter.

Parameter Name HS-SCCH Power Control Method

Parameter ID SCCHPWRCM

GUI Range FIXED, CQI

Physical Range and Unit None

Default Value CQI


MML CommandSET MACHSPARA (BTS3812E, BTS3812AE,BBU3806, BBU3806C)





Description This parameter specifies the HS-SCCH powercontrol method.

Setting Fixed Power ControlIf the HS-SCCH Power Control Method parameter is set to FIXED, the power of the HS-SCCH must be set on the NodeB LMT. The HS-SCCH Power parameter specifies an offsetrelative to the P-CPICH power of the cell.

Parameter Name HS-SCCH Power

Parameter ID SCCHPWR

GUI Range 0 to 80

Physical Range and Unit

-10 to +10Step: 0.25Unit: dB

Default Value 28 (-3 dB)



Description This parameter specifies the fixed transmit powerof the HS-SCCH relative to the P-CPICH powerin dB, when HS-SCCH Power ControlMethod is set to FIXED.This parameter is valid only when HS-SCCHPower Control Method is set to FIXED.

Setting Dynamic Power ControlIf the HS-SCCH Power Control Method parameter is set to CQI, the HS-SCCH FER (‰)parameter should be set on the NodeB LMT.

Parameter Name HS-SCCH FER

Parameter ID SCCHFER

GUI Range 1 to 999

Physical Range and Unit 1‰ to 999‰

Default Value 10




3-89


Description This parameter specifies the target FER of the HS-SCCH. If the actual FER of the HS-SCCH is largerthan the value of this parameter, the HS-SCCHpower increases. Otherwise, the HS-SCCH powerdecreases.This parameter is valid only when the HS-SCCHPower Control Method parameter is set to CQI.

3.3 HSUPA Power ControlHSUPA Power Control describes the power control of HSUPA physical channels including E-DPCCH, E-DPDCH, E-AGCH, E-RGCH, and E-HICH.

3.3.1 Power Control on E-DPCCHThe transmit power on E-DPCCH is calculated according to the power offset between E-DPCCHand uplink DPCCH.3.3.2 Power Control on E-DPDCHThe transmit power on E-DPDCH is calculated according to the power offset between E-DPDCHand uplink DPCCH.3.3.3 E-DCH Outer-Loop Power ControlThe outer-loop power control on E-DCH is used to adjust the transmit power on E-DPDCH, andto keep the QoS of E-DCH on the required level. This kind of power control is implemented inthe SRNC.3.3.4 Downlink Power Control on E-AGCH, E-RGCH, and E-HICHIn the downlink, HSUPA has three additional control channels, and the power of each channelvaries according to the demodulation requirements for each channel.

3.3.1 Power Control on E-DPCCHThe transmit power on E-DPCCH is calculated according to the power offset between E-DPCCHand uplink DPCCH.

Figure 3-8 shows the power offset between E-DPCCH, and uplink DPCCH.

Figure 3-8 Power offset between E-DPCCH and uplink DPCCH





The E-DPCCH transmit power is calculated with the following formula:

PE-DPCCH = PUL DPCCH x A2ec

where:

l PUL DPCCH is the transmit power for the uplink DPCCH.

l Aec is the E-DPCCH power offset parameter configured by RNC through RRC signaling.This parameter is described in the following table:

Parameter Name E-DPCCH power offset

Parameter ID EDpcchPo

GUI Range PO_5/15, PO_6/15, PO_8/15, PO_9/15, PO_12/15,PO_15/15, PO_19/15, PO_24/15, PO_30/15


Default Value PO_15/15


MML Command SET FRC

Description This parameter specifies the quantized amplitude ratioof E-DPCCH to uplink DPCCH.

Recommendation

Recommendation

Be careful when setting the value of the E-DPCCH power offset parameter. If the value istoo small, the error probability of demodulating the E-TFCI will be high and the MAC-e PDUwill be lost, which will lead to a decrease in the throughput. If the value is too large, the E-DPCCH will consume too much uplink load.

3.3.2 Power Control on E-DPDCHThe transmit power on E-DPDCH is calculated according to the power offset between E-DPDCHand uplink DPCCH.

Figure 3-9 shows the power offset between E-DPDCH and uplink DPCCH.



3-91

Figure 3-9 Power offset between E-DPDCH and uplink DPCCH

The E-DPDCH transmit power is calculated with the following formula:

PE-DPDCH = PUL DPCCH x A2ed

where:

l PUL DPCCH is the transmit power for the uplink DPCCH.

l Aed is the quantized value of βed,k,j,uq/βc. For detailed information on how to calculate thisvalue, see Calculation of Gain Factors.

Calculation of Gain Factors

A temporary gain factor βed,j,harq for the jth E-TFC is then calculated as follows:

βed,j,harq = βed,ref x (Le,ref / Le,j)1/2 x (Ke,j / Ke,ref)1/2 x 10(Δharq/20)

where:

l βed,ref denotes the reference gain factor of the reference E-TFC. This gain factor is describedin Calculation of Reference Gain Factors.

l Le,ref denotes the number of E-DPDCHs used for the reference E-TFC and Le, j denotes thenumber of E-DPDCHs used for the jth E-TFC. If Spreading Factor (SF) 2 is used, Le,ref andLe,j are the equivalent number of physical channels with SF4.

l Ke,ref denotes the transport block size of the reference E-TFC.

l Ke,j denotes the transport block size of the jth E-TFC.

l Δharq is HARQ power offset in dB, which is sent from a higher layer. The HARQ poweroffset can be dynamically adjusted in the RNC.

βed,k,j,uq is the unquantized gain factor for the kth E-DPDCH and jth E-TFC. βed,j,harq is scaled bya factor of 21/2 for SF2 codes. βed,k,j,uq is set as follows:

l If the SF for the kth E-DPDCH is 2, βed,k,j,uq = 21/2 x βed,j,harq.

l Otherwise, βed,k,j,uq = βed,j,harq.

Aed is the quantized value of βed,k,j,uq/βc. βed,k,j,uq/βc is quantized according to Table 3-9.





l If βed,k,j,uq/βc is smaller than the smallest quantized value (βed,k/βc) listed in Table 3-9,Aed is the smallest quantized value listed in Table 3-9.

l Otherwise, Aed is the largest quantized value (βed,k/βc) listed in Table 3-9, provided thatthe condition βed,k ≤ βed,k,j,uq is met.

The values to use for quantization are listed in the following table:

Table 3-9 Quantization for βed,k,j,uq/βc

Quantized Amplitude Ratio βed,k/βc

168/15

150/15

134/15

119/15

106/15

95/15

84/15

75/15

67/15

60/15

53/15

47/15

42/15

38/15

34/15

30/15

27/15

24/15

21/15

19/15

17/15

15/15

13/15

12/15



3-93

Quantized Amplitude Ratio βed,k/βc

11/15

9/15

8/15

7/15

6/15

5/15

Calculation of Reference Gain FactorsThe reference E-TFC for the i:th E-TFC is selected as follows

The E-TFCIref,m denotes the E-TFCI of the m:th reference E-TFC which is set by the ReferenceE-TFCI Indexm parameter

where

l m = 1,2,…,M and M is the number of signaled reference E-TFCs which is dependent onthe The Number of Reference E-TFCI parameter.

l E-TFCIref,1 < E-TFCIref,2 < … < E-TFCIref,M

The E-TFCIi denotes the E-TFCI of the i:th E-TFC. The following apply for the i:th E-TFC:

l If E-TFCIi ≥ E-TFCIref,M, the reference E-TFC is the M:th reference E-TFC.

l If E-TFCIi < E-TFCIref,1, the reference E-TFC is the first reference E-TFC.

If E-TFCIref,1 ≤ E-TFCIi < E-TFCIref,M, the reference E-TFC is the m:th reference E-TFC suchthat E TFCIref,m ≤ E-TFCIi < E-TFCIref,m+1.

If the selected reference E-TFC is the k:th reference E-TFC, then the reference gain factor iscalculated with the following formula:

βed,ref = βc x Aed

where

l βed,ref is the reference gain factor.

l Aed is a quantized amplitude ratio equal to the Reference E-TFCI Power Offsetk (k isthe selected reference E-TFC number) parameter.

The mapping between the E-TFC index and the E-DCH transport block size is defined in 3GPPTS 25.321.

The parameters used in the procedure are described in the following tables:

Parameter Name The Number of Reference E-TFCI

Parameter ID RefEtfciNum





GUI Range D1, D2, D3, D4, D5, D6, D7, D8

Physical Range and Unit 1 to 8

Default Value None


MML Command ADD TYPRABOLPC

Description This parameter specifies the number of reference E-TFCIs.

Parameter Name

Reference E-TFCI Index1 / Reference E-TFCIIndex2 / Reference E-TFCI Index3 / Reference E-TFCI Index4 / Reference E-TFCI Index5 / ReferenceE-TFCI Index6 / Reference E-TFCI Index7 /Reference E-TFCI Index8

Parameter IDRefEtfciIdx1 / RefEtfciIdx2 / RefEtfciIdx3 /RefEtfciIdx4 / RefEtfciIdx5 / RefEtfciIdx6 /RefEtfciIdx7 / RefEtfciIdx8

GUI Range 0 to 120

Physical Range and Unit 0 to 120

Default Value None



Description This parameter specifies the index of the PDU size usedby the reference E-TFCI in the E-TFCI table.

Parameter Name

Reference E-TFCI Power Offset1 / Reference E-TFCI Power Offset2 / Reference E-TFCI PowerOffset3 / Reference E-TFCI Power Offset4 /Reference E-TFCI Power Offset5 / Reference E-TFCI Power Offset6 / Reference E-TFCI PowerOffset7 / Reference E-TFCI Power Offset8

Parameter IDRefEtfciPO1 / RefEtfciPO2 / RefEtfciPO3 /RefEtfciPO4 / RefEtfciPO5 / RefEtfciPO6 /RefEtfciPO7 / RefEtfciPO8



3-95

GUI Range

PO_5/15, PO_6/15, PO_7/15, PO_8/15, PO_9/15,PO_11/15, PO_12/15, PO_13/15, PO_15/15,PO_17/15, PO_19/15, PO_21/15, PO_24/15,PO_27/15, PO_30/15, PO_34/15, PO_38/15,PO_42/15, PO_47/15, PO_53/15, PO_60/15,PO_67/15, PO_75/15, PO_84/15, PO_95/15,PO_106/15, PO_119/15, PO_134/15, PO_150/15,PO_168/15


5/15, 6/15, 7/15, 8/15, 9/15, 11/15, 12/15, 13/15, 15/15,17/15, 19/15, 21/15, 24/15, 27/15, 30/15, 34/15, 38/15,42/15, 47/15, 53/15, 60/15, 67/15, 75/15, 84/15, 95/15,106/15, 119/15, 134/15, 150/15, 168/15

Default Value None



DescriptionThis parameter specifies the power offset between theE-DPDCH and the uplink DPCCH used by the referenceE-TFCI.

Recommendation

This parameter must be configured according to the QoS of the service, and the cell throughputmust be considered. Provided that the uplink DPCCH SIR keeps unchanged, if the value ofthis parameter is too small, the time delay of the services on E-DCH may be too high becauseof more retransmission attempts; if the value of this parameter is too large, the user mayconsume too much uplink load. The parameter can be adjusted dynamically by the outer-looppower control algorithm.

3.3.3 E-DCH Outer-Loop Power ControlThe outer-loop power control on E-DCH is used to adjust the transmit power on E-DPDCH, andto keep the QoS of E-DCH on the required level. This kind of power control is implemented inthe SRNC.

Procedure for Outer-Loop Power Control on E-DCHThe QoS on E-DCH is obtained after the RNC performs a macro diversity combination. Sinceonly the correct packets are sent to the RNC from the NodeB, only the number of HARQretransmissions is used as the measurement for the E-DCH QoS.

The outer-loop power control algorithm can adjust the SIR target according to the QoS of servicesnot only on DCH but also on E-DCH. In addition, it can adjust the reference power offset andHARQ power offset according to the QoS of the services on E-DCH.

Figure 3-10 shows the general procedure for outer-loop power control on E-DCH for a singleservice.





Figure 3-10 General procedure for outer-loop power control on E-DCH for a single service

Adjusting the SIR Target PeriodicallyThe SIR Target adjustment is defined by the OLPC adjustment period parameter. For detailedinformation on the parameter, see 3.1.3.1 Uplink Outer-Loop Power Control Based onBLER.

The process of adjusting the SIR target periodically is as follows:

1. The RNC calculates the SIR target in the jth adjustment period obtained by DCH and useit as DSIRtar(j). For detailed information on how to calculate the DSIRtar(j), see the SIRtarformula. The SIRtar value from the formula should be used as the DSIRtar(j) value.The service will not be involved in the OLPC algorithm if its SIR adjustment stepparameter is set to 0. For detailed information on the parameter, see 3.1.3.1 Uplink Outer-Loop Power Control Based on BLER.

2. The RNC calculates the delta SIR of E-DCH.The control target of OLPC can be the number of retransmissions or the residual BLER.l If the Switch to select Algorithm parameter is set to BASEDONMEANNHT, then

NHRtar(i) is the control target of OLPC.

l If the Switch to select Algorithm parameter is set to BASEDONRESIDUALBLER,then BLERres,tar(i) is the control target of OLPC.

Figure 3-11 shows how to select and calculate the control target.



3-97

Figure 3-11 Calculate the delta SIR of E-DCH

where:l DeltaSIR(i) is the adjustment amount of SIR.

l AdjFactor is the coefficient that can be set through the SIR adjustment coefficientparameter. For detailed information on the parameter, see 3.1.3.1 Uplink Outer-LoopPower Control Based on BLER.

l i is the MAC-d flow i, and j is the jth SIR adjustment period.

l NrOfPdus(i,j) is the number of PDUs actually received from MAC-d flow i in the jthadjustment period.

l AvgNrOfPdus(i,j) is the estimated number of PDUs received from MAC-d flow i in thejth adjustment period. The value of AvgNrOfPdus(i,j) is calculated with differentformulas depending on which scheme is used. The formulas used are as follows:– For BASEDONMEANNHT scheme:

AvgNrOfPdus(i,j) = SIRAdjustPeriod / (TTI x (NHRtar(i) + 1))

– For BASEDONRESIDUALBLER scheme:AvgNrOfPdus(i,j) = SIRAdjustPeriod / (TTI x (NHRmax(i) + 1))

where:– SIRAdjustPeriod is the length of the SIR adjustment period.

– TTI is the transmission timing interval.

– NHR is the Number of HARQ Retransmissions.NHRtar(i) is the target number of retransmissions of MAC-es PDUs in E-DCH MAC-d flow i. NHRtar(i) is set through the Target Number of E-DCH PDU retransferparameter.NHRmax(i) is the maximum number of retransmissions of MAC-es PDUs in E-DCHMAC-d flow i. NHRmax(i) is set through the Maximum Number of E-DCH PDUretransfer parameter.

l ESIRStepDn(i) is the E-DCH SIR adjustment step. It is set through the E-DCH SIRdecrease step parameter.

l NHRavg(i,j) is the measured average number of retransmissions of MAC-es PDUs in E-DCH MAC-d flow i.

l BLERres,meas(i,j) is the proportion of the received MAC-es PDUs that fulfills either ofthe following criteria within jth adjustment period:





– The number of retransmissions of the PDUs is larger than NHRmax(i), which is theconfigurable maximum number of retransmissions.

– The PDUs whose number of retransmissions reached the maximum still fail to becorrectly received.

l BLERres,tar(i) is set through the Target of E-DCH residual BLER parameter of E-DCHMAC-d flow i.

NOTE

Typically, the algorithm based on residual BLER is used for VoIP services, while NHRtar is selectedas the control target for BE and streaming services.

3. The RNC updates the SIR target of E-DCH in the jth OLPC period. This SIR target, ESIRtar(j), is calculated with the following formula:ESIRtar(j) = max [ min(ESIRtar(j - 1) + MaxDeltaSIR, MAXSIRTARGET),MINSIRTARGET ]where:l ESIRtar(j–1) is the SIR target of E-DCH in the (j–1)th OLPC period.

l MaxDeltaSIR = max({DeltaSIR(i), i = 1, 2, ...})– If MaxDeltaSIR > 0, MaxDeltaSIR = min(MaxDeltaSIR, EdchSirMaxUpStep).

EdchSirMaxUpStep is set through the Maximum E-DCH SIR increase stepparameter.

– Otherwise, MaxDeltaSIR = max(MaxDeltaSIR, –EdchSirMaxDownStep).EdchSirMaxDownStep is set through the Maximum E-DCH SIR decrease stepparameter.

l MINSIRTARGET is the maximum among the values of the Minimum SIR targetparameter for each service.

l MAXSIRTARGET is the maximum among the values of the Maximum SIR targetparameter for each service.

For detailed information on the Maximum SIR target and Minimum SIR targetparameters, see 3.1.3.1 Uplink Outer-Loop Power Control Based on BLER.

4. The RNC updates the SIR target of NodeB with SIRtar(j). The SIRtar(j) is calculated withthe following formula:SIRtar(j) = max(ESIRtar(j), DSIRtar(j))

5. The RNC updates ESIRtar(j) and DSIRtar(j). The values are the same as the SIRtar(j).

The parameters used in the above procedure are described in the following tables:

Parameter Name Switch to select Algorithm

Parameter ID OlpcAlgSwitch

GUI Range Enum{BASEDONRESIDUALBLER, BASEDONMEANNHT}

Physical Range andUnit

BASEDONRESIDUALBLER, BASEDONMEANNHT

Default Value None

Optional/Mandatory

Optional



3-99


Description This parameter defines which algorithm is used.

Recommendation l For BE and streaming services, set this parameter toBASEDONMEANNHT.

l For conversational services, set this parameter toBASEDONRESIDUALBLER.

Parameter Name Target of E-DCH residual BLER

Parameter ID ResBLER

GUI Range 0 to 1000


0% to 100%Step: 0.1%

Default Value None

Optional/Mandatory

Optional


Description This parameter specifies the target proportion of the MAC-es PDUsin a MAC-d flow that fulfill either of the following criteria within anadjustment period:l The number of retransmissions of the PDUs exceeds the

maximum.l The PDUs whose number of retransmissions reached the

maximum still fail to be correctly received.

Recommendation

Be careful when setting this parameter. If this parameter is set too large, the packet discardingwill be too large and the QoS will deteriorate. If this parameter is set too small, the convergenceof OLPC will be slow and difficult.

Parameter Name Maximum E-DCH SIR increase step

Parameter ID EdchSirMaxUpStep

GUI Range 0 to 5000






Range: 0 to 5Step: 0.001Unit: dB

Default Value None

Optional/Mandatory

Optional


Description This parameter specifies the maximum increase step of the SIRtarwithin an SIR adjustment period.

Recommendation If this parameter is set too large, the effect of OLPC may fail toachieve the expectation. If this parameter is set too small, theconvergence of OLPC may fail. Therefore, the setting of thisparameter should be associated with the actual adjustment step ofSIRtar.

Parameter Name Maximum E-DCH SIR decrease step

Parameter ID EdchSirMaxDownStep

GUI Range 0 to 5000



Default Value None

Optional/Mandatory

Optional


Description This parameter specifies the maximum decrease step of the SIRtarwithin an SIR adjustment period.

Recommendation If this parameter is too large, the UL transmit power will fluctuategreatly, which may lead to large fluctuations of the RTWP. If thisparameter is too small, the convergence of OLPC is too slow.Therefore, the setting of this parameter should be associated with theactual adjustment step of SIRtar.

Parameter Name E-DCH SIR decrease step

Parameter ID EdchSirStepDn



3-101

GUI Range 0 to 5000



Default Value None

Optional/Mandatory

Optional


Description This parameter specifies the decrease step of the SIR target valuewithin an SIR adjustment period.

Recommendation If this parameter is too large, the SIR target will fluctuate greatly,which may lead to large fluctuations of RTWP. If this parameter istoo small, the convergence of OLPC is too slow. Therefore, thesetting of this parameter should be associated with the actualadjustment step of SIRtar.

Parameter Name Target Number of E-DCH PDU retransfer

Parameter ID EdchTargetRetransNum

GUI Range 0 to 150


Range: 0 to 15Step: 0.1Unit: times

Default Value None



Description This parameter specifies the target number of retransmissions of E-DCH MAC-es PDUs used to carry the service.

Recommendation

The parameter should be set according to the QoS of the service, andthe cell throughput should also be considered. If the value of thisparameter is too large, the delay will be high. If the value of thisparameter is too small, the UE may consume too much uplink load.

Parameter Name Maximum Number of E-DCH PDU retransfer

Parameter ID MaxEdchRetransNum





GUI Range 0 to 15


Range: 0 to 15Unit: times

Default Value None



DescriptionThis parameter specifies the maximum number of retransmissionattempts of the MAC-es PDUs in the E-DCH MAC-d flow used tocarry the service.

Recommendation This parameter should be set according to the QoS of the service.For BE services, a large value is recommended.

Updating the Target Power Offset PeriodicallyWhen the outer-loop power offset adjustment period E-DCH Power Offset Period times out,the target power offset is adjusted according to the following:

1. The RNC obtains the delta power offset for outer-loop power control.l If the Maximum E-DCH Power offset increase step parameter of the service is set to

0, the service will not be involved in the adjustment and no power offset is obtained.l If the Maximum E-DCH Power offset increase step parameter of the service is set to

another value than 0, the power offset is set according to the following:– If the Switch to select Algorithm parameter is set to BASEDONRESIDUALBLER,

the power offset adjustment is calculated with the following formula:DeltaPO(i) = AdjFactor x EPOStepDn(i) x (BLERres,meas(i,j) - BLERres,tar(i)) /BLERres,tar(i)

– If the Switch to select Algorithm parameter is set to BASEDONMEANNHT, thepower offset adjustment is calculated with the following formula:DeltaPO(i) = AdjFactor x EPOStepDn(i) x (NHRavg(i,j) - NHRtar(i)) / NHRtar(i)

where:– AdjFactor is the coefficient that can be set through the SIR adjustment coefficient

parameter. For setailed information on the parameter, see Uplink Outer-Loop PowerControl Based on BLER.

– EPOStepDn(i) is set through the E-DCH Power offset decrease step parameter.

– BLERres,meas(i,j) is the proportion of the received MAC-es PDUs that fulfills eitherof the criteria described in BLER criteria.

– BLERres,tar(i) is set through the Target of E-DCH residual BLER parameter of E-DCH MAC-d flow i.

2. The RNC limits the DeltaPO(i) by the Maximum E-DCH Power offset increase step andMaximum E-DCH Power offset decrease step parameters according to the following:l If DeltaPO(i) > 0, the power offset adjustment is calculated with the following formula:



3-103

DeltaPO(i) = min(DeltaPO(i), MaxEPOStepUp)where:– MaxEPOStepUp is defined by the Maximum E-DCH Power offset increase step

parameter.

l Otherwise, the power offset adjustment is calculated with the following formula:DeltaPO(i) = max(DeltaPO(i), –MaxEPOStepDn)where:– MaxEPOStepDn is defined by the Maximum E-DCH Power offset decrease

step parameter.3. The RNC calculates the new target power offset with the following formula:

POtar(i) = POtarOld(i) + DeltaPO(i)where:l POtar(i) is the new target power offset.

l POtarOld(i) is the POtar value for service i in the former E-DCH Power OffsetPeriod.

l DeltaPO(i) is the power offset adjustment.

If POtar(i) is outside the range of [MINPOTARGET, MAXPOTARGET], it will be set toMINPOTARGET or MAXPOTARGET.where:l MINPOTARGET is the maximum among the values of the Minimum Reference

Power Offset For Maximum Reference E-TFCI parameter for each service.l MAXPOTARGET is the maximum among the values of the Maximum Reference

Power Offset For Maximum Reference E-TFCI parameter for each service.4. If POtar(i) changes, then:

(1) The RNC uses the maximum value of POtar(i) of all services as POtarMax.(2) The RNC uses the minimum POtar(i) that meets the condition of POtarMax – POtar

(i) ≤ 6 dB as POref.(3) The RNC sets all the POtar(i) parameters that do not meet the condition of POtarMax

– POtar(i) ≤ 6 dB to POref. .After the step, the offset between all services does not exceed 6 dB, the same as theHARQ power offset in signaling.

(4) The RNC sets the HARQ power offset of each MAC-d flow to meet the condition ofHARQPO(i) = POtar(i) – POref, and quantize the HARQ power offset as integers inthe range 0 dB to 6 dB.

5. Based on POref and HARQPO(i), the RNC updates the Reference E-TFCI Power Offsetk(k=1,...,M, M is indicated by the parameter The Number of Reference E-TFCI )parameter and HARQ power offset of the UE and the NodeB through Uu and Iub signaling.The new Reference E-TFCI Power Offsetk is calculated with the following formula:Reference E-TFCI Power Offsetk = Reference E-TFCI Power Offsetk,old + POref -POref,oldwhere:l Reference E-TFCI Power Offsetk,old is the old parameter value.

l POref if the reference power offset according to 4.





l POref,old is the last reference power offset for the maximum reference E-TFCI.

The parameters used in the above procedure are as follows:

Parameter Name E-DCH Power offset decrease step

Parameter ID EdchPOStepDn

GUI Range 0 to 5000

Physical Range and UnitRange: 0 to 5Step: 0.001Unit: dB

Default Value 25



Description This parameter specifies the decrease step for the E-DCH power offset within a PO adjustment period.

Recommendation

If the value of this parameter is small, the power offsetadjustment is slow. If the value of this parameter islarge, the power offset adjustment is fast. Therefore,set this parameter as required.

Parameter Name Maximum E-DCH Power offset increase step

Parameter ID EdchPOMaxUpStep

GUI Range 0 to 5000


Default Value None



DescriptionThis parameter specifies the maximum adjustmentstep for increasing the E-DCH power offset within aPO adjustment period.

RecommendationIf the value of this parameter is too small or too large,it cannot control the adjustment. Therefore, set thisparameter to a proper value, for example, 2 dB.



3-105

Parameter Name Maximum E-DCH Power offset decrease step

Parameter ID EdchPOMaxDownStep

GUI Range 0 to 5000


Default Value None



DescriptionThis parameter specifies the maximum adjustmentstep for decreasing the E-DCH power offset within aPO adjustment period.

RecommendationIf the value of this parameter is too small or too large,it cannot control the adjustment. Therefore, set thisparameter to a proper value, for example, 2 dB.

Parameter Name E-DCH Power Offset Period

Parameter ID EdchPoPeriod

GUI Range 1 to 255

Physical Range and UnitRange: 100 to 25500Step: 100Unit: ms

Default Value None



Description

This parameter specifies the shortest period ofupdating the reference E-TFCI power offset andHARQ power offset by the outer-loop power controlalgorithm of HSUPA.

Recommendation

The RNC updates the power offset parameter throughUu and Iub interface signaling. If the value of thisparameter is too large, the signaling load may be tooheavy. If the value of this parameter is too small, theadjustment may be too slow to follow the channelchange.





Parameter Name Maximum Reference Power Offset For MaximumReference E-TFCI

Parameter ID MaxEdchPOForMaxRefEtfci

GUI Range



5/15, 6/15, 7/15, 8/15, 9/15, 11/15, 12/15, 13/15,15/15, 17/15, 19/15, 21/15, 24/15, 27/15, 30/15, 34/15,38/15, 42/15, 47/15, 53/15, 60/15, 67/15, 75/15, 84/15,95/15, 106/15, 119/15, 134/15, 150/15, 168/15

Default Value None



DescriptionThis parameter specifies the maximum power offsetbetween the E-DPDCH and the DPCCH used by thereference E-TFCI.

Parameter Name Minimum Reference Power Offset For MaximumReference E-TFCI

Parameter ID MinEdchPOForMaxRefEtfci

GUI Range



5/15, 6/15, 7/15, 8/15, 9/15, 11/15, 12/15, 13/15,15/15, 17/15, 19/15, 21/15, 24/15, 27/15, 30/15, 34/15,38/15, 42/15, 47/15, 53/15, 60/15, 67/15, 75/15, 84/15,95/15, 106/15, 119/15, 134/15, 150/15, 168/15

Default Value None





3-107

DescriptionThis parameter specifies the minimum power offsetbetween the E-DPDCH and the DPCCH used by thereference E-TFCI.

3.3.4 Downlink Power Control on E-AGCH, E-RGCH, and E-HICHIn the downlink, HSUPA has three additional control channels, and the power of each channelvaries according to the demodulation requirements for each channel.

The HSUPA control channels are as follows:

l E-AGCH = E-DCH Absolute Grant Channel

l E-RGCH = E-DCH Relative Grant Channel

l E-HICH = E-DCH HARQ Acknowledgement Indicator Channel

Demodulation Requirements

The demodulation requirements are different in different radio link conditions, Table 3-10 andTable 3-11 show the demodulation requirements for E-HICH and E-RGCH respectively. Forthe E-AGCH, the demodulation error rate must be lower than 0.01. For detailed information ondemodulation requirements, refer to 3GPP TS 25.101.

Table 3-10 Demodulation requirements for E-HICH

Item False ACK Probability Missed ACKProbability

Single link 0.5 0.01

RLS containing the serving E-DCHcell 0.1 0.05

RLS not containing the serving E-DCH cell 2.00E-04 0.05

Table 3-11 Demodulation requirements for E-RGCH

Item Missed HOLDProbability

Missed UP/DOWNProbability

Single link or serving E-DCH RLS 0.1 0.05/0.05

Non-serving E-DCH radio links 0.005 0.05

Power Control Method

The following power control methods are used:





l Fixed transmit power control, used on E-RGCH, E-HICH, and E-AGCH.

l Dynamic transmit power control based on downlink DPCH, used on E-RGCH, E-HICH,and E-AGCH. This method consists of the RNC Config and NodeB Dynamic methods.

l HSDPA-based power control, used only on E-AGCH. This method consists of the BaseCQI, and Base HS-SCCH methods and the method is used when HSUPA and HSDPA areapplied at the same time.

The power control methods can be selected on the NodeB LMT for each channel through theparameters described in the following tables. The following applies for the parameter settings:

l If the parameter value is FIXED, the power will be set according to the power on P-CPICH.For detailed information on the PCPICH transmit power parameter, see 3.1.1.1 UplinkOpen-Loop Power Control on PRACH.

l If the parameter value is NODEB DYNAMIC, the power will be set according to the poweron DPCH or F-DPCH of the same UE. For detailed information on DPCH, see 3.1.1.2Uplink Open-Loop Power Control on DCH. For detailed information on F-DPCH, see3.1.1.5 Downlink Open-Loop Power Control on F-DPCH.

l If the parameter value is BASE CQI or BASE HSSCCH, the power on AGCH will be setaccording to the CQI or the power on HS-SCCH. For detailed information on HS-SCCH,see Power Control on HS-SCCH and HS-PDSCH.

The parameters on the NodeB side are described in the following tables:

Parameter Name E-AGCH HPC Mode

Parameter ID EAGCHPCMOD

GUI Range FIXED, RNC CONFIG, NODEB DYNAMIC, BASECQI, BASE HSSCCH

Physical Range and Unit fixed, RNC config, NodeB dynamic, base CQI, baseHSSCCH

Default Value None


MML Command SET MACEPARA (BTS3812E, BTS3812AE,BBU3806, BBU3806C)

Description This parameter is used to select a power control algorithmon the E-AGCH.

Parameter Name E-RGCH HPC Mode for Service Radio Link Set

Parameter ID SERGCHPCMOD

GUI Range FIXED, RNC CONFIG, NODEB DYNAMIC

Physical Range and Unit fixed, RNC config, NodeB dynamic

Default Value FIXED



3-109



Description This parameter is used to select a power control algorithmon the E-RGCH that belongs to the serving E-DCH RLS.

Parameter Name E-RGCH HPC Mode for Non-service Radio Links

Parameter ID NSEHICHPCMOD



Default Value FIXED



DescriptionThis parameter is used to select a power control algorithmon the E-RGCH that does not belong to the serving E-DCH RLS.

Parameter Name E-HICH HPC Mode for Service Radio Link Set

Parameter ID SEHICHPCMOD



Default Value FIXED



Description This parameter is used to select a power control algorithmon the E-HICH when the RLS contains the serving RL.

Parameter Name E-HICH HPC Mode for Non-service Radio Link Set

Parameter ID NSEHICHPCMOD







Default Value FIXED



DescriptionThis parameter is used to select a power control algorithmon the E-HICH when the RLS does not contain theserving RL.

Fixed Transmit Power ControlIf the fixed transmit power control is used, the transmit power on E-AGCH, E-RGCH, and E-HICH is calculated with the following formula:

P = PP-CPICH + PO

where:

l P is the transmit power on these channels.

l PP-CPICH is the transmit power on P-CPICH.

l PO is the power offset, used for setting the power on E-AGCH, E-HICH, or E-RGCH indifferent situations.– If the values of the parameters are too small, the demodulation performance of the

channels may not meet the requirement.– If they are too large, the channels will consume too much NodeB transmit power.

The power offset is set on the NodeB LMT through the parameters described in the followingtables.

Parameter Name E-AGCH Power

Parameter ID EAGCHPOWER

GUI Range –350 to +150

Physical Range and UnitRange: –35 to +15Step: 0.1Unit: dB

Default Value –92



Description This parameter specifies the power offset between the E-AGCH and the P-CPICH.



3-111

Parameter Name E-RGCH Power for Service Radio Link Set

Parameter ID SERGCHPOWER






DescriptionThis parameter specifies the power offset between the E-RGCH that belongs to the serving E-DCH RLS and theP-CPICH.

Parameter Name E-RGCH Power for Non-service Radio Links

Parameter ID NSERGCHPOWER






DescriptionThis parameter specifies the power offset between the E-RGCH that does not belong to the serving E-DCH RLSand the P-CPICH.

Parameter Name E-HICH Power for Single Radio Link Set

Parameter ID EHICHPOWER










DescriptionThis parameter specifies the power offset between the E-HICH and the P-CPICH when Multi RLS Ind configuredby the RNC indicates single radio link set.

Parameter Name E-HICH Power for Service Radio Link Set

Parameter ID SEHICHPOWER






Description This parameter specifies the power offset between the E-HICH in RLS with serving RL and the P-CPICH.

Parameter Name E-HICH Power for Non-service Radio Link Set

Parameter ID NSEHICHPOWER







3-113


Description This parameter specifies the power offset between the E-HICH in RLS without serving RL and the P-CPICH.

Dynamic Transmit Power Control Based on Downlink DPCH PowerAmong the three additional HSUPA channels, E-RGCH and E-HICH are exclusive for UEs. E-AGCH is a common channel on which UEs are multiplexed on a time basis. The information ata given time, channel code, and signature is intended only for a specific UE. This enables thesetting of transmit power on a user basis to increase the usage of NodeB transmit power.

The dynamic control of the transmit power on E-AGCH, E-RGCH, and E-HICH is based onDPCH. Demodulation conditions in different scenarios and demodulation differences must betaken into account for dynamic transmit power control. Table 3-12 describes the demodulationdifferences between different information fields of the same type of channel on the UE side.

Table 3-12 Soft combination on the UE side

Channel/Information Field Soft Combination Range

DPDCH Soft combination of all radio links.

DPCCH Pilot Soft combination of all radio links.

DPCCH TPC Soft combination of RLSs with the same TPCcombination indication

E-AGCH No soft combination; sent on only one RL

E-RGCH in serving E-DCH RLS Soft combination of E-DCH RLSs with the same RGcombination indication

E-RGCH not in serving E-DCHRLS No soft combination

E-HICH Soft combination of RLSs with the same TPCcombination indication

F-DPCHNo soft combination. The UE estimates only the F-DPCH performance in the serving cell for powercontrol.

In different conditions, the number of radio links joining soft combination is different, whichleads to different gain values. The inner-loop and outer-loop power control on DCH is used toensure that the power for each data field on DPCH meets service requirements.

The RNC can adjust the power offset of the TPC field according to the conditions of the activeset to meet the demodulation quality requirement. As described in Table 3-12, the softcombination range of any of the three HSUPA downlink control channels is quite similar to thatof the TPC field, which can be obtained by the NodeB. Therefore, the power offset of the TPCfield is used in the dynamic transmit power control algorithm.





When dynamic transmit power control is implemented, the transmit power is calculated in eachtimeslot with the DPCH-based fast power control algorithm:

P = PTPC + FUN(PowOffset, SF, SlotNum, SFDPCH, BitTPC) + ΔSHO

where:

l P is the transmit power on E-AGCH, E-RGCH, or E-HICH.

l PTPC is the transmit power in the TPC field on DL DPCH or F-DPCH.

l PowOffset is the power offset on the specific channel.– If the value is too small, the demodulation performance of the channels may not meet

the requirement.– If the value is too large, the channels will consume too much NodeB transmit power.

PowOffset is set through the following parameters:– E-AGCH Power Offset

– E-RGCH Power Offset for Service Radio Link Set

– E-RGCH Power Offset for Non-service Radio Links

– E-HICH Power for Single Radio Link Set

– E-HICH Power Offset for Service Radio Link Set

– E-HICH Power Offset for Non-service Radio Link Set

These parameters are not directly the ratio of the transmit power on E-AGCH, E-RGCH orE-HICH to that of DPCCH. The transmit power on E-AGCH, E-RGCH, and E-HICHshould be calculated by using the method mentioned in this document.

l SF is the spreading factor on an HSUPA downlink control channel. The SF is 256 on E-AGCH and 128 on E-RGCH or E-HICH.

l SlotNum is the duration of the information on the control channel. Table 3-13 describesthe values of SlotNum.

Table 3-13 SlotNum values for 2 ms and 10 ms TTI

Item SlotNum for 2 ms TTI SlotNum for 10 ms TTI

E-AGCH 3 15

E-RGCH ofServing RLS 3 12

E-RGCH of Non-serving RLS 15 15

E-HICH 3 12

l SFDPCH is the spreading factor used by the current timeslot on DPCH.

l BitTPC is the number of bits used by the TPC on DPCH.

l ΔSHO is used to correct the transmit power and obtained from soft combination.

– For E-AGCH, ΔSHO is proportional to the number of radio links in DCH RLS with theserving RL.



3-115

When the UE is configured with only the F-DPCH, the power of the F-DPCH iscontrolled on the basis of the channel quality in the serving cell, as described in Table3-12, instead of increasing for soft handover. In this case, ΔSHO is 0 dB.

– For E-RGCH that is not in the serving E-DCH RLS, ΔSHO is the same as that of E-AGCH.

– For E-RGCH in the serving E-DCH RLS, ΔSHO is proportional to the ratio of the numberof radio links in DCH RLS to the number of radio links in serving E-DCH RLS.When the UE is configured with only F-DPCH, the power of the F-DPCH is controlledon the basis of the channel quality in the serving cell, as described in Table 3-12, insteadof increasing for soft handover. In this case, ΔSHO is inversely proportional to the numberof radio links in serving E-DCH RLS.

– For E-HICH, ΔSHO is proportional to the ratio of the number of radio links in DCH RLSto the number of E-DCH radio links in DCH RLS.When the UE is configured with only the F-DPCH, ΔSHO is inversely proportional tothe number of E-DCH radio links in DCH RLS.

– The number of radio links in DCH RLS is used as above. This number is set to a fixedvalue of 3, which is usually the maximum value of the RLS size. Then, an additionalpower margin is reserved to guarantee the demodulation performance.

The parameters on the NodeB side are described in the following tables:

Parameter Name E-AGCH Power Offset

Parameter ID EAGCHPWROFFSET

GUI Range 0 to 255

Physical Range and UnitRange: –32 to +31.75Step: 0.25Unit: dB

Default Value 142



Description This parameter is used to calculate the power offsetbetween the E-AGCH and the DPCH.

Parameter Name E-RGCH Power Offset for Service Radio Link Set

Parameter ID SERGCHPWROFFSET

GUI Range 0 to 255






Default Value 100



DescriptionThis parameter is used to calculate the power offsetbetween the E-RGCH in serving E-DCH RLS and theDPCH.

Parameter Name E-RGCH Power Offset for Non-service RadioLinks

Parameter ID NSERGCHPWROFFSET

GUI Range 0 to 255


Default Value 105



DescriptionThis parameter is used to calculate the power offsetbetween the E-RGCH in non-serving E-DCH radiolinks and the DPCH.

Parameter Name E-HICH Power Offset for Single Radio Link Set

Parameter ID EHICHPWROFFSET

GUI Range 0 to 255


Default Value 88




3-117


Description

This parameter is used to calculate the power offsetbetween the E-HICH and the DPCH when Multi RLSInd configured by the RNC indicates single radio linkset.

Parameter Name E-HICH Power Offset for Service Radio Link Set

Parameter ID SEHICHPWROFFSET

GUI Range 0 to 255


Default Value 96



DescriptionThis parameter is used to calculate the power offsetbetween the E-HICH in RLS with serving RL and theDPCH.

Parameter Name E-HICH Power Offset for Non-service Radio LinkSet

Parameter ID NSEHICHPWROFFSET

GUI Range 0 to 255


Default Value 116



DescriptionThis parameter is used to calculate the power offsetbetween the E-HICH in RLS without serving E-DCHcell and the DPCH.





HSDPA-Based Power Control on E-AGCHHSDPA does not support soft handover. The HSDPA power control is based on the serving cell.As stated in the protocols, the serving HSUPA cell must be consistent with the serving HSDPAcell. Therefore, the HSDPA information can be used for E-AGCH power control.

The available HSDPA information of CQI and HS-SCCH is discontinuous. The CQI reportingperiod is configured by the network, and HS-SCCH carries data only when the HS-DSCHtransmits data. To reduce coupling and keep consistency between algorithms, the DPCH-basedfast power control algorithm is still applicable to E-AGCH power control. When the relevantHSDPA information is available, the power control parameter PowOffset of E-AGCH iscorrected.

Process of HSDPA-Based Power Control for E-AGCH

Figure 3-12 shows the process of HSDPA-based power control for E-AGCH.



3-119

Figure 3-12 Procedure for HSDPA-based power control on E-AGCH

The transmit power of the E-AGCH calculated by the HSDPA-based power control algorithmmust also match the range from (P-CPICH power + E-AGCH Max Power) to (P-CPICH power+ E-AGCH Min Power). The E-AGCH Max Power and E-AGCH Min Power parametersare set on the NodeB LMT, and are described in the following tables:





Parameter Name E-AGCH Max Power

Parameter ID MAXAGCHPOWER



Default Value –60



Description

This parameter specifies the maximum power offsetbetween the E-AGCH and the P-CPICH when theHSDPA-based E-AGCH power control algorithm isapplied.

Parameter Name E-AGCH Min Power

Parameter ID MINAGCHPOWER






Description

This parameter specifies the minimum power offsetbetween the E-AGCH and the P-CPICH when theHSDPA-based E-AGCH power control algorithm isapplied.

CQI-Based Power Offset Correction for E-AGCH

E-AGCH transmits data only in the serving cell, whereas CQI indicates the channel quality inthe serving cell. The power of the E-AGCH can be associated with the CQI. The CQI reportingperiod depends on the setting of HSDPA parameters. Therefore, to reduce coupling betweenalgorithms, the CQI is not directly used to calculate the transmit power on the E-AGCH. Instead,CQI is used to correct the power offset parameter, PowOffset, which is calculated with thefollowing formula:



3-121

PowOffset = PowOffsetCfgAg + FUNC(PCPICH, CQI, MPO, CO, SF, BitTPC) - PTPC - ΔSHO

where:

l PowOffset is the power offset parameter.

l PowOffsetCfgAg is the power offset of the E-AGCH calculated on the basis of the DCHpower offset.

l PCPICH is the transmit power of the CPICH.

l CQI is the channel quality indication. The UE reports the downlink channel quality to thecell.

l MPO is a parameter configured by the network.

l CO is the offset between CQI and CPICH Ec/No. It indicates the difference between theHS-DSCH quality and the CPICH Ec/No. This parameter is defined by the UE. Its defaultvalue is 4.5 dB.

l SF is the spreading factor used by the current timeslot on DPCH.

l BitTPC is the number of bits used by the TPC.

l PTPC is the transmit power in the TPC field of the DL DPCH or F-DPCH.

l ΔSHO is the corrected value of soft combination.

NOTETo minimize the effect of CQI reporting error, the CQI in this formula must be a value filtered by theassociated HSDPA algorithm.

HS-SCCH-Based Power Offset Correction for E-AGCH

In this algorithm, the NodeB determines the demodulation error rate of HS-SCCH based on theHSDPA feedback in the uplink. Then based on the demodulation error rate, the NodeB correctsthe transmit power of the HS-SCCH by steps.

HS-SCCH and E-AGCH have the same requirement for the demodulation error rate, that is, <1%. The two types of channel use the same coding scheme, similar length of code blocks, andsimilar puncturing ratio. Therefore, the Signal-to-Noise Ratios (SNRs) required fordemodulation of the two types of channel are regarded as the same.

The power offset parameter PowOffset of the E-AGCH can be corrected according to thefollowing formula:

PowOffset = PHSSCCH + FUNC(SF, BitTPC, Gcode) + PTPC - ΔSHO

where:

l PowOffset is the power offset parameter of the E-AGCH.

l PHSSCCH is the transmit power of the HS-SCCH.

l SF is the spreading factor used by the current timeslot on DPCH.

l BitTPC is the number of bits used by the TPC.

l Gcode is the coding gain of the E-AGCH. It is 0 dB by default.

l PTPC is the transmit power in the TPC field of the DL DPCH or F-DPCH.

l ΔSHO is the corrected value of soft combination.





NOTE

The downlink HS-SCCH exists only when HSDPA data is transmitted. Therefore a timer is required. Afterthe timer expires, CQI is used again to update the power offset.

The HS-SCCH-based power offset correction for E-AGCH can only be used when the HS-SCCH uses thedynamic power control algorithm.

3.4 Power Control ParametersPower Control Parameters provides information on the effective level and configuration of theparameters related to the feature.

Table 3-14 lists the parameters related to power control.

Table 3-14 Parameters related to power control

Parameter Name Effective Level Configurationon ...

PCPICH transmit power Cell RNC

Constant value for calculating initial TXpower

Cell RNC

AICH transmission timing Cell RNC

Power increase step Cell RNC

Max preamble retransmission Cell RNC

Max preamble loop Cell RNC

Random back-off lower limit Cell RNC

Random back-off upper limit Cell RNC

Power offset Cell RNC

Gain Factor BetaC Cell RNC

Gain Factor BetaD Cell RNC

Constant value configured by default Global RNC

Max allowed UE UL TX power Cell RNC

Max UL TX power of conversationalservice

Cell RNC

Max UL TX power of streaming service Cell RNC

Max UL TX power of interactive service Cell RNC

Max UL TX power of backgroundservice

Cell RNC

UL rate matching attribute RAB and SRB RNC

DL rate matching attribute RAB and SRB RNC



3-123


Reference BetaC RAB and SRB RNC

Reference BetaD RAB and SRB RNC

DL power control mode 1 Cell RNC

RRC Proc DPCCH PC preamble length Cell RNC

RRC Proc SRB delay Cell RNC

HHO Proc DPCCH PC preamble length Cell RNC

HHO Proc SRB delay Cell RNC

PSCH transmit power Cell RNC

SSCH transmit power Cell RNC

BCH transmit power Cell RNC

Max transmit power of FACH Cell RNC

PCH power Cell RNC

AICH power offset Cell RNC

PICH power offset Cell RNC

Initial power offset for SHO Cell RNC

RL Max DL TX power Cell RNC

RL Min DL TX power Cell RNC

TFCI power offset Global RNC

TPC power offset Global RNC

Pilot power offset Global RNC

FDPCH minimum reference power Global RNC

F-DPCH Power Offset Global RNC

FDPCH maximum reference power Global RNC

Power control algorithm selection Global RNC

UL closed loop power control step size Global RNC

NodeB DeltaSIR1 Global RNC

NodeB DeltaSIRafter1 Global RNC

NodeB DeltaSIR2 Global RNC

NodeB DeltaSIRafter2 Global RNC






ITP Global RNC

RPP Global RNC

DL power control mode Global RNC

Power control algorithm switch Global RNC

DL power window average size Cell RNC

FDD DL power control step size Global RNC

Power increase limit Cell RNC

UE Delta SIR1 Global RNC

UE Delta SIRAfter1 Global RNC

UE Delta SIR2 Global RNC

UE Delta SIRAfter2 Global RNC

SIR init target value RAB and SRB RNC

OLPC adjustment period RAB and SRB RNC

SIR measurement filter coefficient Global RNC

SIR adjustment coefficient Global/Cell RNC

Signalling DCH_BLER target value SRB RNC

Service DCH_BLER target value RAB RNC

SIR adjustment step RAB and SRB RNC

Maximum SIR increase step RAB and SRB RNC

Maximum SIR decrease step RAB and SRB RNC

Maximum SIR target RAB and SRB RNC

Minimum SIR target RAB and SRB RNC

DTX BER target filter coefficient RAB and SRB RNC

None DTX BER target filter coefficient RAB and SRB RNC

BER target value upper threshold RAB and SRB RNC

BER target value lower threshold RAB and SRB RNC

BER based SIR up step length RAB and SRB RNC

BER based SIR down step length RAB and SRB RNC

DPB measurement report period Global RNC



3-125


DPB measurement filter coefficient Global RNC

DPB triggering threshold Global RNC

Ratio for max power Global RNC

DPB adjustment ratio Global RNC

DPB adjustment period Global RNC

Max DPB adjustment step Global RNC

ACK poweroffset1 Cell RNC



ACK poweroffset1 multi-RLS Cell RNC



NACK poweroffset1 Cell RNC



NACK poweroffset1 multi-RLS Cell RNC



CQI Power Offset Cell RNC

CQI Power Offset multi-RLS Cell RNC

ACK-NACK Repetition Factor 1 Cell RNC



ACK-NACK Repetition Factor multi-RLS

Cell RNC

CQI Repetition Factor Cell RNC

CQI Repetition Factor multi-RLS Cell RNC

CQI Feedback Cycle k Cell RNC

CQI Feedback Cycle k multi-RLS Cell RNC

HS-SCCH Power Control Method Cell NodeB






HS-SCCH Power Cell NodeB

HS-SCCH FER (‰) Cell NodeB

E-DPCCH power offset Global RNC

Reference E-TFCI Index RAB and SRB RNC

Reference E-TFCI Power Offset RAB and SRB RNC

Switch to select Algorithm RAB and SRB RNC

Target of E-DCH residual BLER RAB and SRB RNC

Maximum E-DCH SIR increase step RAB and SRB RNC

Maximum E-DCH SIR decrease step RAB and SRB RNC

E-DCH SIR decrease step RAB and SRB RNC

Target Number of E-DCH PDUretransfer

RAB and SRB RNC

Maximum Number of E-DCH PDUretransfer

RAB and SRB RNC

E-DCH Power offset decrease step RAB and SRB RNC

Maximum E-DCH Power offset increasestep

RAB and SRB RNC

Maximum E-DCH Power offsetdecrease step

RAB and SRB RNC

E-DCH Power Offset Period RAB and SRB RNC

Maximum E-DCH Power Offset RAB and SRB RNC

Minimum E-DCH Power Offset RAB and SRB RNC

E-AGCH HPC Mode Cell NodeB

E-RGCH HPC Mode for Service RadioLink Set

Cell NodeB

E-RGCH HPC Mode for Non-serviceRadio Links

Cell NodeB

E-HICH HPC Mode for Service RadioLink Set

Cell NodeB

E-HICH HPC Mode for Non-serviceRadio Link Set

Cell NodeB

E-AGCH Power Cell NodeB



3-127


E-RGCH Power for Service Radio LinkSet

Cell NodeB

E-RGCH Power for Non-service RadioLinks

Cell NodeB

E-HICH Power for Single Radio LinkSet

Cell NodeB

E-HICH Power for Service Radio LinkSet

Cell NodeB

E-HICH Power for Non-service RadioLink Set

Cell NodeB

E-AGCH Power Offset Cell NodeB

E-RGCH Power Offset for ServiceRadio Link Set

Cell NodeB

E-RGCH Power Offset for Non-serviceRadio Links

Cell NodeB

E-HICH Power Offset for Single RadioLink Set

Cell NodeB

E-HICH Power Offset for Service RadioLink Set

Cell NodeB

E-HICH Power Offset for Non-serviceRadio Link Set

Cell NodeB

E-AGCH Max Power Cell NodeB

E-AGCH Min Power Cell NodeB





4 Implementing Power Control

Implementing Power Control provides information on and examples of how to enable,reconfigure, and disable the feature.

For detailed information on how to implement Power Control, see Configuring PowerControl in RAN Feature Configuration Guide.

RANPower Control Description 4 Implementing Power Control


4-1

5 Power Control Reference Documents

Power Control Reference Documents lists the reference documents related to the feature.

l 3GPP TS 25.211: Physical channels and mapping of transport channels onto physicalchannels (FDD)

l 3GPP TS 25.214: Physical layer procedures (FDD)

l 3GPP TS 25.331: RRC Protocol Specification

l 3GPP TS 25.433: UTRAN Iub interface NodeB Application Part (NBAP) signaling

RANPower Control Description 5 Power Control Reference Documents


5-1

Date post:	13-Oct-2014
Category:	Documents
Upload:	hasangn
View:	269 times
Download:	24 times