07- OWJ200103 WCDMA Power Control and Relevant Parameters

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WCDMA Power Control and WCDMA Power Control and Relevant ParametersRelevant Parameters

ISSUE 1.1ISSUE 1.1

HUAWEI TECHNOLOGIES CO., LTD. Page 2All rights reserved

Chapter 1 Power Control OverviewChapter 1 Power Control Overview

Chapter 2 Open Loop Power Control Chapter 2 Open Loop Power Control

Chapter 3 Closed Loop Power Control Chapter 3 Closed Loop Power Control


Uplink transmission characterUplink transmission character

Self-interferenceSelf-interference

Capacity is limited by interference levelCapacity is limited by interference level

Near-far effectNear-far effect

Fading Fading

Uplink power controlUplink power control

Ensure uplink quality with minimum transmission powerEnsure uplink quality with minimum transmission power

Decrease interference to other UE, and increase capacityDecrease interference to other UE, and increase capacity

Solve the near-far effectSolve the near-far effect

Save UE transmission powerSave UE transmission power

Purpose of uplink power control


Downlink transmission characterDownlink transmission character

Interference among different subscribers since the orthogonality is Interference among different subscribers since the orthogonality is

influenced by transmission environmentinfluenced by transmission environment

Interference from other adjacent cellsInterference from other adjacent cells

Downlink capacity is limited by NodeB transmission powerDownlink capacity is limited by NodeB transmission power

Fading Fading

Downlink power controlDownlink power control

Ensure downlink quality with minimum transmission powerEnsure downlink quality with minimum transmission power

Decrease interference to other cells, and increase capacityDecrease interference to other cells, and increase capacity

Save NodeB transmission powerSave NodeB transmission power

Purpose of downlink power control


Power control classification

Power control classificationPower control classification ：：

Open loopOpen loop power control power control

− Uplink Uplink open loopopen loop power control power control

− Downlink Downlink open loopopen loop power control power control

Closed loopClosed loop power control power control

− Uplink Uplink inner loopinner loop power control power control

− Downlink Downlink inner loopinner loop power control power control

− Uplink Uplink outer loopouter loop power control power control

− Downlink Downlink outer loopouter loop power control power control


Power control methods adopted for various physical channelsPower control methods adopted for various physical channels

Power control methods adopted for various physical channelsPower control methods adopted for various physical channels

““√√" – can be applied, “X" – not applied" – can be applied, “X" – not applied


Common Physical channels power parameters

MAXTXPOWER MAXTXPOWER

Value Range: 0 to 500Value Range: 0 to 500

Physical Value Range: 0dBm to 50 dBm, step 0.1dBPhysical Value Range: 0dBm to 50 dBm, step 0.1dB

The default setting is 430, namely 43dBmThe default setting is 430, namely 43dBm

Content: The sum of the maximum transmit power of all the downlink channels in a cellContent: The sum of the maximum transmit power of all the downlink channels in a cell

Set this parameter through Set this parameter through ADD CELLSETUPADD CELLSETUP, query it through , query it through LST CELLLST CELL and modify it and modify it

through through MOD CELL

PCPICHPOWER PCPICHPOWER

Value Range: -100 to 500Value Range: -100 to 500

Physical Value Range: -10dBm to 50 dBm, step 0.1dBPhysical Value Range: -10dBm to 50 dBm, step 0.1dB

The default setting is 330, namely 33dBmThe default setting is 330, namely 33dBm

Set this parameter through Set this parameter through ADD PCPICH, query it through , query it through LST PCPICH and modify it and modify it

through through MOD CELL


Common Physical channels power parameters

PSCHPOWER orPSCHPOWER or SSCHPOWER SSCHPOWER

Value RangeValue Range ：： -350 to 150-350 to 150

Physical Value RangePhysical Value Range ：： -35 to 15 dB, step 0.1dB-35 to 15 dB, step 0.1dB

The default value is -50, namely -5dBThe default value is -50, namely -5dB

For PschPower, set it through For PschPower, set it through ADD PSCH, and query it through , and query it through LST PSCH; for ; for

SschPower, set it through SschPower, set it through ADD SSCH, and query it through LST SSCH. After the cell is , and query it through LST SSCH. After the cell is

set up, they can both be modified through MOD CELLset up, they can both be modified through MOD CELL

BCHPOWERBCHPOWER



The default value is -20, namely -2dBThe default value is -20, namely -2dB

Set this parameter through Set this parameter through ADD BCH, query it through , query it through LST BCH, and modify it through , and modify it through

MOD CELL


Common Physical Channels power parameters

PCHPOWERPCHPOWER



The default value of this parameter is -20, namely -2dBThe default value of this parameter is -20, namely -2dB

Set this parameter through Set this parameter through ADD PCH, query it through , query it through LST PCH, and modify it through , and modify it through

MOD SCCPCH

MAXFACHPOWER MAXFACHPOWER

Value range : -350 to 150Value range : -350 to 150


The default value of this parameter is 10, namely 1dBThe default value of this parameter is 10, namely 1dB

Set this parameter through Set this parameter through ADD FACHADD FACH, query it through , query it through LST FACHLST FACH, and modify it through , and modify it through

MOD SCCPCHMOD SCCPCH


Common Physical Channels power parameters

AICHPOWEROFFSETAICHPOWEROFFSET

Value RangeValue Range ：： -22 to 5dB-22 to 5dB

Physical Value RangePhysical Value Range ：： -22 to 5 dB-22 to 5 dB


Set this parameter through ADD CHPWROFFSET, query it through LST CHPWROFFSET, Set this parameter through ADD CHPWROFFSET, query it through LST CHPWROFFSET,

and modify it through MOD AICHPWROFFSET and modify it through MOD AICHPWROFFSET

PICHPOWEROFFSET PICHPOWEROFFSET

Value RangeValue Range ：： -10 to 5 dB-10 to 5 dB

Physical Value RangePhysical Value Range ：： -10 to 5 dB , step 1dB-10 to 5 dB , step 1dB


Set this parameter through ADD CHPWROFFSET, query it through LST CHPWROFFSET, Set this parameter through ADD CHPWROFFSET, query it through LST CHPWROFFSET,

and modify it through MOD PICHPWROFFSETand modify it through MOD PICHPWROFFSET



Chapter 2 Open Loop Power ControlChapter 2 Open Loop Power Control



Chapter 2 Open loop Power Control Chapter 2 Open loop Power Control

2.1 Open loop power control overview2.1 Open loop power control overview

2.2 PRACH open loop power control2.2 PRACH open loop power control

2.3 Dedicated channel open loop power control2.3 Dedicated channel open loop power control


Open loop Power Control Overview

PurposePurpose

UE estimates the power loss of signals on the propagation path by measuring the UE estimates the power loss of signals on the propagation path by measuring the

downlink channel signals, then calculates the initial transmission power of the downlink channel signals, then calculates the initial transmission power of the

uplink channeluplink channel

PrinciplePrinciple

Path loss of the uplink channel is related to path loss of the downlink channelPath loss of the uplink channel is related to path loss of the downlink channel

DisadvantageDisadvantage

This power control method is rather roughThis power control method is rather rough

Application scenariosApplication scenarios

Open loop power control is applied only at the beginning of connection setup, Open loop power control is applied only at the beginning of connection setup,

generally in setting the initial power valuegenerally in setting the initial power value


Chapter 2 Open Power Control Chapter 2 Open Power Control





Open Loop Power control of PRACHOpen Loop Power control of PRACH

1. CCCH : RRC Connection Request

open loop power control of PRACH

5. Downlink Synchronization

UE Node BServing RNS

Serving RNC

DCH - FP

Allocate RNTISelect L1 and L2parameters

RRC RRC

NBAP NBAP

3. Radio Link Setup Response

NBAP NBAP

2. Radio Link Setup Request

RRC RRC

7. CCCH : RRC Connection Set up

Start RX description

Start TX description

4. ALCAP Iub Data Transport Bearer Setup

RRC RRC

9. DCCH : RRC Connection Setup Complete

6. Uplink Synchronization

NBAP NBAP

8. Radio Link Restore Indication

DCH - FP

DCH - FP

DCH - FP


Open Loop Power Control of PRACH

AICH accessslots RX at UE

PRACH accessslots TX at UE

One access slot

p-a

p-mp-p

Pre-amble

Pre-amble

Message part

Acq.Ind.



The interval between two preambles should be longer than the minimum value, The interval between two preambles should be longer than the minimum value, p-p p-p p-p,minp-p,min ，，Parameters are defined as followingParameters are defined as following

AICH_Transmission_Timing = 0AICH_Transmission_Timing = 0

− p-p,min = 15360 chips (3 access slots) p-p,min = 15360 chips (3 access slots)

− p-a = 7680 chipsp-a = 7680 chips

− p-m = 15360 chips (3 access slots)p-m = 15360 chips (3 access slots)

AICH_Transmission_Timing = 1AICH_Transmission_Timing = 1

− p-p,min = 20480 chips (4 access slots)p-p,min = 20480 chips (4 access slots)

− p-a = 12800 chipsp-a = 12800 chips

− p-m = 20480 chips (4 access slots)p-m = 20480 chips (4 access slots)

AICHTXTIMING AICHTXTIMING

− Value rangeValue range ：： 0,10,1

− The default value of this parameter is 1The default value of this parameter is 1

− Set this parameter through Set this parameter through ADD AICHADD AICH, query it through , query it through LST AICHLST AICH, and modify it needs , and modify it needs

de-activated the cell through de-activated the cell through DEA CELL DEA CELL . After the old configuration of AICH is deleted . After the old configuration of AICH is deleted

through through RMV AICHRMV AICH , a new AICH can be established through , a new AICH can be established through ADD AICHADD AICH



The initial value of PRACH power is set through open loop power controlThe initial value of PRACH power is set through open loop power control ：：

Power Ramp StepPp-m

10ms/20ms

Preamble_Initial_power

Preamble_Initial_Power = Primary CPICH DL TX power - CPICH_RSCP + UL Preamble_Initial_Power = Primary CPICH DL TX power - CPICH_RSCP + UL interference + Constant Valueinterference + Constant Value



CONSTANTVALUE CONSTANTVALUE

Value range : -35 to -10dBValue range : -35 to -10dB

Physical Value RangePhysical Value Range ：： -35 to -10 dB-35 to -10 dB

The default value of this parameter is -20dBThe default value of this parameter is -20dB

Set this parameter through Set this parameter through ADD PRACHBASICADD PRACHBASIC, query it through , query it through LST PRACHLST PRACH, and , and

modify it through modify it through MOD PRACHUUPARASMOD PRACHUUPARAS

POWERRAMPSTEPPOWERRAMPSTEP

Value range : 1 to 8dBValue range : 1 to 8dB

Physical Value RangePhysical Value Range ：： 1 to 8 dB1 to 8 dB

The default value of this parameter is 2dBThe default value of this parameter is 2dB

Set this parameter through Set this parameter through ADD PRACHBASICADD PRACHBASIC, query it through , query it through LST PRACHLST PRACH, and , and

modify it through modify it through MOD PRACHUUPARASMOD PRACHUUPARAS



POWEROFFSETPPMPOWEROFFSETPPM

Value range : -5 to 10dBValue range : -5 to 10dB

The power offset between the last access preamble and the message control part. The The power offset between the last access preamble and the message control part. The

power of the message control part can be obtained by adding the offset to the access power of the message control part can be obtained by adding the offset to the access

preamble powerpreamble power.. The default value of this parameter is -2dB for service transmissionThe default value of this parameter is -2dB for service transmission

Set this parameter through Set this parameter through ADD PRACHTFCADD PRACHTFC, query it through , query it through LST PRACHLST PRACH, and modify it , and modify it

de-activated the cell through de-activated the cell through DEA CELL DEA CELL . After the old configuration of PRACH is deleted . After the old configuration of PRACH is deleted

through through RMV PRACHTFCRMV PRACHTFC , a new parameters can be established through , a new parameters can be established through ADD PRACHTFCADD PRACHTFC

PREAMBLERETRANSMAXPREAMBLERETRANSMAX

Value range : 1 to 64Value range : 1 to 64

The default value of this parameter is 20The default value of this parameter is 20

Set this parameter through Set this parameter through ADD PRACHBASICADD PRACHBASIC, query it through , query it through LST PRACHLST PRACH, and modify it , and modify it

through through MOD PRACHUUPARASMOD PRACHUUPARAS


Chapter 2 Open loop Power Control Chapter 2 Open loop Power Control





Open Loop Power Control of DL DPDCH Open Loop Power Control of DL DPDCH


open loop power control of DPDCH



Serving RNC

DCH - FP

Allocate RNTISelect L1 and L2 parameters

RRC RRC

NBAP NBAP


NBAP NBAP


RRC RRC





RRC RRC



NBAP NBAP


DCH - FP

DCH - FP

DCH - FP


Open Loop Power Control of DL DPDCH

The DL DPDCH open loop power control can be calculated by theThe DL DPDCH open loop power control can be calculated by the following formula: following formula:

Parameters explanationParameters explanation

(Eb/N0)dl is the Eb/N0 target to ensure the service quality, RNC (Eb/N0)dl is the Eb/N0 target to ensure the service quality, RNC searches for the (Eb/N0)dl target dynamically using a set of pre-searches for the (Eb/N0)dl target dynamically using a set of pre-defined values corresponding to specific cell environment type defined values corresponding to specific cell environment type coding type, rate ,BLER target coding type, rate ,BLER target

(Ec/Io)cpich is measured by UE, then it is sent to UTRAN by RACH(Ec/Io)cpich is measured by UE, then it is sent to UTRAN by RACH

R is the requested data bit rate by the userR is the requested data bit rate by the user

W is the chip rateW is the chip rate

CPICH

CPICHDLInitial NEc

PNEb

W

RP

)0/()0/(



TFCIPOTFCIPO


Physical value range: 0~6 dB; step: 0.25Physical value range: 0~6 dB; step: 0.25

Content: The offset of TFCI bit transmit power from data bit transmit power in each time slot Content: The offset of TFCI bit transmit power from data bit transmit power in each time slot

of radio frames on DL DPCHof radio frames on DL DPCH

The default value of this parameter is 0 ,namely 0dBThe default value of this parameter is 0 ,namely 0dB

Set this parameter through Set this parameter through SET FRCSET FRC, query it through , query it through LST FRCLST FRC, and modify it through , and modify it through SET SET

FRCFRC

TPCPOTPCPO



Content: The offset of TPC bit transmit power from data bit transmit power in each time slot Content: The offset of TPC bit transmit power from data bit transmit power in each time slot

of radio frames on DL DPCHof radio frames on DL DPCH


Set this parameter through Set this parameter through SET FRCSET FRC, query it through , query it through LST FRCLST FRC, and modify it through , and modify it through SET SET

FRCFRC



PILOTPOPILOTPO



The offset of pilot bit transmit power from data bit transmit power in each time slot of radio The offset of pilot bit transmit power from data bit transmit power in each time slot of radio

frames on DL DPCHframes on DL DPCH


Set this parameter through Set this parameter through SET FRCSET FRC, query it through , query it through LST FRCLST FRC, and modify it through , and modify it through

SET FRCSET FRC


Open Loop Power Control of UL DPCCH Open Loop Power Control of UL DPCCH


open loop power control of DPCCH



Serving RNC

DCH - FP

Allocate RNTISelect L1 and L2parameters

RRC RRC

NBAP NBAP


NBAP NBAP


RRC RRC





RRC RRC



NBAP NBAP


DCH - FP

DCH - FP

DCH - FP


Open Loop Power Control of UL DPCCH

The UL DPCCH open loop power control can be calculated by the The UL DPCCH open loop power control can be calculated by the

following formulafollowing formula ：：

pcpichRSCPoffsetpowerDPCCHpowerinitialDPCCH ____

tValuesDefaultConerferenceulDLTXpoweroffsetpowerDPCCH pcpich tanint__

Parameters explanationParameters explanation

RSCPpcpich is the received signal code power , the received power on one code RSCPpcpich is the received signal code power , the received power on one code

measured on the PCPICH . It is a measurement performed by the UEmeasured on the PCPICH . It is a measurement performed by the UE

DPCCH-power-offset is provided by RNC to the UE via RRC signalingDPCCH-power-offset is provided by RNC to the UE via RRC signaling


Open Loop Power Control of UL DPCCH

DEFAULTCONSTANTVALUEDEFAULTCONSTANTVALUE

Value range : -35 to -10 , unit :dBValue range : -35 to -10 , unit :dB

The default value of this parameter is -27 dBThe default value of this parameter is -27 dB

Set this parameter through Set this parameter through SET FRCSET FRC, query it through , query it through LST FRCLST FRC, and modify it through , and modify it through

SET FRCSET FRC



Chapter 2 Open Loop Power Control Chapter 2 Open Loop Power Control




3.1 Closed loop power control overview3.1 Closed loop power control overview

3.2 Uplink inner loop power control3.2 Uplink inner loop power control

3.3 Downlink inner loop power control3.3 Downlink inner loop power control

3.4 Outer loop power control3.4 Outer loop power control


Closed Loop Power Control Overview

The characteristics of open loop power controlThe characteristics of open loop power control

The results from open loop power control are not accurate enoughThe results from open loop power control are not accurate enough

open loop power control can only decide the initial poweropen loop power control can only decide the initial power

The advantages of closed loop power controlThe advantages of closed loop power control

Guarantee the QoSGuarantee the QoS

Decrease the interferenceDecrease the interference

Increase the system capacityIncrease the system capacity

Inner loopOuter loop

BLERmea>BLERtar→SIRtar

BLERmea<BLERtar→SIRtar

Until BLERmea=BLERtar

SIRtar

SIRmea>SIRtar→TPC=0

SIRmea<SIRtar→ TPC=1

UntilSIRmea=SIRtar

TPC

TPC=0 Power

TPC=1 Power

BLERtar

Ensure the QoS with minimum

power


Chapter 3 Closed loop Power ControlChapter 3 Closed loop Power Control






Uplink Inner Loop Power Control

NodeB compares the measured SIR to the target SIRNodeB compares the measured SIR to the target SIR

NodeB

UE

Transmit TPC

Inner-loop

set SIRtar

1500Hz1500Hz

Each UE has its own loop

Each UE has its own loop

TPC Decision(0 ， 1)

TPC_CMD（ -1, 0, 1）

Adjust DPCCH Tx△ DPCCH= tpc×TPC_cmd△

PCA1 PCA2

Adjust DPDCH Tx(βc,βd)

Compare SIRmeas with SIRtar

SIRmea>SIRtar→TPC=0SIRmea<SIRtar→ TPC=1


UE gets one TPC in each time slotUE gets one TPC in each time slot

If TPC=0, TPC_cmd= -1If TPC=0, TPC_cmd= -1

If TPC=1, TPC_cmd= 1If TPC=1, TPC_cmd= 1

This control is done in each time slot

Power control frequency is 1500HZ

0 1 1 0 1 1 0 1 1 0…… ……

…… ……TPC_CMD

TPC

-1 1 1 -1 1 1 -1 1 1 -1

Uplink Inner Loop PCA1 without soft handover


0 1 1 0 1 1 0 1 1 0…… ……

RLS1-TPC (W1)

…… ……RLS2-TPC (W2) 1 0 1 1 0 1 0 1 0 1

…… ……

…… ……TPC_CMD

0 0 1 0 0 1 1 0 1 1

-1 -1 1 -1 -1 1 -1 -1 -1 -1

Each time slot, combine TPC from different RLS ， then get Wi

CELL1 CELL2

CELL4CELL3

RL11 RL12

RLS1

RLS2 RLS3

RLS3-TPC (W3)

Get TPC_cmd based on

TPC_cmd = γ (W1, W2, … WN)

Uplink Inner Loop PCA1 with soft handover


TS0 TS1 TS2 TS3 TS4 TS5 TS6 TS7 TS8 TS9 TS10 TS11 TS12 TS13 TS14

0 0 0 0 0 1 1 1 1 1 1 1 0 1 1

10ms/frame

Group 2Group 1 Group 3

…… ……

0 0 0 0 -1 0 0 0 0 1 0 0 0 0 0

TPC

TPC_CMD

Transmission power will be controlled in each 5 time slots

The frequency is 300HZ

…… ……

Uplink Inner Loop PCA2 without soft handover


Combine TPC from same RLS in each time slot

Calculate TPC_cmd

TPC_CMD=1

TPC_CMD is set to -1 if any of TPC_temp1 to TPC_tempN are equal to -1

Otherwise TPC_CMD=0

Calculate TPC_tempi for each RLSIf 5 TPC are all 1, TPC_tempi=1

If 5 TPC are all 0, TPC_tempi=-1Otherwise, TPC_tempi =0

5.0_1

1

N

iitempTPC

N

CELL1 CELL2

CELL4CELL3

RL11 RL12

RLS1

RLS2 RLS3




RLS1 0 0 1 0 0 0 0 0 0 0 0 1 0 0 1

RLS2 1 1 1 1 1 0 0 0 0 0 1 1 0 0 1

RLS3 1 1 1 1 1 0 0 0 0 0 1 1 1 1 1

…… ……

10ms/frameGroup 1 Group 2 Group 3


RLS1 0 0 0 0 0 0 0 0 0 -1 0 0 0 0 0

RLS2 0 0 0 0 1 0 0 0 0 -1 0 0 0 0 0

RLS3 0 0 0 0 1 0 0 0 0 -1 0 0 0 0 1

…… ……

TPC

TPC_tempi


0 0 0 0 1 0 0 0 0 -1 0 0 0 0 0…… ……

TPC_CMD

Power is controlled in each 5 time slots

The power control frequency is 300HZ



Uplink Inner Loop Power Control

PWRCTRLALGPWRCTRLALG

Value range : ALGORITHM1, ALGORITHM2Value range : ALGORITHM1, ALGORITHM2

The default value of this parameter is ALGORITHM1 The default value of this parameter is ALGORITHM1

Set this parameter through Set this parameter through SET FRCSET FRC, query it through , query it through LST FRCLST FRC, and modify it through, and modify it through

SET FRCSET FRC

ULTPCSTEPSIZEULTPCSTEPSIZE

Value range :1dBValue range :1dB ，， 2dB2dB

The default value of this parameter is 1dB The default value of this parameter is 1dB

Set this parameter through Set this parameter through SET FRCSET FRC, query it through , query it through LST FRCLST FRC, and modify it through, and modify it through

SET FRCSET FRC


Chapter 3 Closed loop Power Control Chapter 3 Closed loop Power Control






Downlink Closed Loop Power Control

NodeB

Set SIRtar

Transmit TPC in each TS

Measure SIR and compare

it with SIRtar

Adjust Tx power

with 0.5, 1, 1.5 or 2dB

1500HzL3



When UE is not in soft handoverWhen UE is not in soft handover

The TPC which is generated by UE is transmitted in TPC domain of UL The TPC which is generated by UE is transmitted in TPC domain of UL

channelchannel

When UE is in soft handover, two power control modes can be used, When UE is in soft handover, two power control modes can be used,

which is decided by DPC_mode:which is decided by DPC_mode:

DPC_MODEDPC_MODE ＝＝ 00 ，， UE will transmit TPC in every slotUE will transmit TPC in every slot

DPC_MODEDPC_MODE ＝＝ 11 ，， UE will transmit the same TPC in every three time UE will transmit the same TPC in every three time

slotsslots

When the downlink channel is in out of synchronization, UE will When the downlink channel is in out of synchronization, UE will

transmit TPC 1 because UE can not measure the downlink SIRtransmit TPC 1 because UE can not measure the downlink SIR



DPCMODEDPCMODE

Value range: SINGLE_TPC(DPC_MODE=0), Value range: SINGLE_TPC(DPC_MODE=0), TPC_TRIPLET_IN_SOFT(DPC_MODE=1), TPC_AUTO_ADJUSTTPC_TRIPLET_IN_SOFT(DPC_MODE=1), TPC_AUTO_ADJUST

Content: SIGNLE_TPC, a fast power control mode, indicates that a unique TPC Content: SIGNLE_TPC, a fast power control mode, indicates that a unique TPC command is sent in each time slot on DPCCH. TPC_TRIPLET_IN_SOFT, a slow command is sent in each time slot on DPCCH. TPC_TRIPLET_IN_SOFT, a slow power control mode, indicates that the same TPC command is sent in three time slots, power control mode, indicates that the same TPC command is sent in three time slots, it is applicable to soft handover and it can decrease the power deviation. it is applicable to soft handover and it can decrease the power deviation. TPC_AUTO_ADJUST, an automatically adjusted mode, indicates that the value of TPC_AUTO_ADJUST, an automatically adjusted mode, indicates that the value of DPC_MODE can be modified by sending the message "ACTIVE SET UPDATE" to UEDPC_MODE can be modified by sending the message "ACTIVE SET UPDATE" to UE

The default value of this parameter is SINGLE_TPC The default value of this parameter is SINGLE_TPC

Set this parameter through Set this parameter through SET FRCSET FRC, query it through , query it through LST FRCLST FRC, and modify it through, and modify it through SET FRCSET FRC

FDDTPCDLSTEPSIZEFDDTPCDLSTEPSIZE

Value range: STEPSIZE_0.5DB, STEPSIZE_1DB, STEPSIZE_1.5DB, STEPSIZE_2DBValue range: STEPSIZE_0.5DB, STEPSIZE_1DB, STEPSIZE_1.5DB, STEPSIZE_2DB

Physical value range: 0.5, 1, 1.5, 2 dBPhysical value range: 0.5, 1, 1.5, 2 dB

The default value of this parameter is STEPSIZE_1DB, namely 1dB The default value of this parameter is STEPSIZE_1DB, namely 1dB

Set this parameter through Set this parameter through SET FRCSET FRC, query it through , query it through LST FRCLST FRC, and modify it through, and modify it through SET FRCSET FRC


The transmission power can not higher than The transmission power can not higher than Maximum_DL_PowerMaximum_DL_Power, and , and

not less than not less than Minimum_DL_PowerMinimum_DL_Power neither neither

Downlink power adjustment:Downlink power adjustment:

Pk Pk 1PTPCkPbalk

WhereWhere

P(k-1) is power of previous P(k-1) is power of previous

PPTPCTPC(k) is the adjustment(k) is the adjustment

PPbalbal(k) is correction value(k) is correction value




RLMAXDLPWRRLMAXDLPWR



The maximum downlink transmit power of radio link. This parameter should fulfill the The maximum downlink transmit power of radio link. This parameter should fulfill the

coverage requirement of the network planning, and the value is relative to [PCPICH coverage requirement of the network planning, and the value is relative to [PCPICH

transmit power]transmit power]

Set this parameter through Set this parameter through ADD CELLRLPWR ADD CELLRLPWR , query it through , query it through LST CELLRLPWRLST CELLRLPWR, and , and

modify it through modify it through MOD CELLRLPWRMOD CELLRLPWR

RLMINDLPWRRLMINDLPWR



Set this parameter through Set this parameter through ADD CELLRLPWR ADD CELLRLPWR , query it through , query it through LST CELLRLPWRLST CELLRLPWR, and , and

modify it through modify it through MOD CELLRLPWRMOD CELLRLPWR



Referential configurations of typical services:Referential configurations of typical services:


PTPC(k)

Without “Limited Power Raise Used”Without “Limited Power Raise Used”

WhereWhere

PPTPCTPC(k) is the adjustment value (k) is the adjustment value

TPCTPCestest(k) is uplink TPC value(k) is uplink TPC value

△△ TPC is downlink power adjustment step(TPC is downlink power adjustment step(0.5, 1, 1.5 or 2dB0.5, 1, 1.5 or 2dB))


0)(TPCifΔ

1)(TPCifΔ)(P

estTPC

estTPCTPC k

kk


Where

PTPC(k)

With “Limited Power Raise Used”With “Limited Power Raise Used”

PPTPCTPC(k) is the adjustment value (k) is the adjustment value

TPCTPCestest(k) is uplink TPC value(k) is uplink TPC value

△△ TPC is downlink power adjustment step(TPC is downlink power adjustment step(0.5, 1, 1.5 or 2dB0.5, 1, 1.5 or 2dB))

Power_Raise_Limit: the limited value for Power ramping in a timerPower_Raise_Limit: the limited value for Power ramping in a timer

DL_power_averaging_window_sizeDL_power_averaging_window_size ：： timer for power ramping ,unit :time slottimer for power ramping ,unit :time slot


0)(TPC if

e_LimitPower_Rais)( and 1)(TPC if

e_LimitPower_Rais)( and 1)(TPC if

0)(

est

est

est

k

kk

kk

kP TPCsum

TPCsum

TPC

TPC

TPC

1

1____

)()(k

SizeWindowAveragingPowerDLkiTPCsum iPk



INNER_LOOP_DL_LMTED_PWR_INC_SWITCHINNER_LOOP_DL_LMTED_PWR_INC_SWITCH

Value rangeValue range ：： 1 (ON) , 0 (OFF)1 (ON) , 0 (OFF)

The default value of this parameter is 0 ,namely OFFThe default value of this parameter is 0 ,namely OFF

Set this parameter through Set this parameter through SET CORRMALGOSWITCHSET CORRMALGOSWITCH, query it through , query it through LST LST

CORRMALGOSWITCHCORRMALGOSWITCH, and modify it through, and modify it through SET CORRMALGOSWITCHSET CORRMALGOSWITCH

POWERRAISELIMITPOWERRAISELIMIT

Value range: 0 to 10 dBValue range: 0 to 10 dB

The default value of this parameter is 10dBThe default value of this parameter is 10dB

CommentComment ：： The increase of DL transmit power within The increase of DL transmit power within DlPowerAverageWindowSizeDlPowerAverageWindowSize

cannot exceed this parameter valuecannot exceed this parameter value

Set this parameter through Set this parameter through ADD CELLSETUPADD CELLSETUP, query it through , query it through LST CELLLST CELL, and and modify , and and modify

it through it through MOD CELLSETUPMOD CELLSETUP



DLPOWERAVERAGEWINDOWSIZEDLPOWERAVERAGEWINDOWSIZE

Value range: 1 to 60 time slotsValue range: 1 to 60 time slots

Content: UTRAN calculates the increase of DL transmit power within the period defined via Content: UTRAN calculates the increase of DL transmit power within the period defined via

this parameter to determine whether the increase exceeds PowerRaiseLimit. If so, UTRAN this parameter to determine whether the increase exceeds PowerRaiseLimit. If so, UTRAN

will not increase the power even when it receives the command to raise the powerwill not increase the power even when it receives the command to raise the power

The default value of this parameter is 20 time slotsThe default value of this parameter is 20 time slots

Set this parameter through Set this parameter through ADD CELLSETUPADD CELLSETUP, query it through , query it through LST CELLLST CELL ,and modify it ,and modify it

through through MOD CELLSETUPMOD CELLSETUP




Downlink Power Balance

Downlink power balance processDownlink power balance process

SRNC can monitor every single SRNC can monitor every single

NodeB’s transmission. If SRNC found NodeB’s transmission. If SRNC found

the power offset in soft handover is the power offset in soft handover is

excessive, it will initiate the DPB excessive, it will initiate the DPB

processprocess

The initiation and stop of DPBThe initiation and stop of DPB

The power offset of two RLs is greater The power offset of two RLs is greater

than the DPB initial threshold, the than the DPB initial threshold, the

DPB process is initiated DPB process is initiated

The power offset of two RLs is less The power offset of two RLs is less

than the DPB stop threshold, the DPB than the DPB stop threshold, the DPB

process is stoppedprocess is stopped

NodeB

NodeB

Initiate the DPB process

DPB process


Downlink Power Balance

DPBSTARTTHD DPBSTARTTHD

Value range: 0 to 255Value range: 0 to 255

Physical value range: 0~127.5dB ; step: 0.5Physical value range: 0~127.5dB ; step: 0.5


Set this parameter through Set this parameter through SET DPBSET DPB, query it through , query it through LST DPBLST DPB and modify it through and modify it through SET SET

DPBDPB

DPBSTOPTHDDPBSTOPTHD

Value range: 0~255Value range: 0~255

Physical value range: 0~127.5dB ; step: 0.5Physical value range: 0~127.5dB ; step: 0.5


Set this parameter through Set this parameter through SET DPBSET DPB, query it through , query it through LST DPBLST DPB and modify it through and modify it through SET SET

DPBDPB


Chapter 3 Closed loop Power Control Chapter 3 Closed loop Power Control






Outer Loop Power Control

The character of outer loop power controlThe character of outer loop power control

The QoS which UTRAN provides to CN is BLER, not SIRThe QoS which UTRAN provides to CN is BLER, not SIR

The relationship between inner loop power control and outer loop The relationship between inner loop power control and outer loop

power controlpower control

SIRtar should be satisfied with the requirement of decoding SIRtar should be satisfied with the requirement of decoding

correctly. But different multi-path radio environments request correctly. But different multi-path radio environments request

different SIRdifferent SIR

Therefore, the outer loop power control can adjust the SIR to get a Therefore, the outer loop power control can adjust the SIR to get a

stable BLER in the changeable radio environmentstable BLER in the changeable radio environment


BLER--SIR

•BL

ER

SIR

BLER


Uplink Outer Loop Power Control

NodeB UE

Transmit TPC

Measure and compare SIR

Inner-loop

Set SIRtar

Out loop

RNC

Measure received data and compare BLER in the TrCH

Set BLERtar

10-100Hz


NodeB

set SIRtar

Transmit TPC

Measure and compare SIR

Measure and compare BLER

Outer loop

Inner loop L1

L3

10-100Hz1500Hz

Downlink Outer Loop Power Control



etBLERt

etBLERtBLERmeastepSIRAdjustSoefficientSIRAdjustcSIRtar

arg

arg**

Where Where

SirAdjustStep: Outer loop power control adjustment stepSirAdjustStep: Outer loop power control adjustment step

SirAdjustFactor: Coefficient for outer loop power controlSirAdjustFactor: Coefficient for outer loop power control

BLERBLERestest: Estimated BLER: Estimated BLER

BLERBLERtartar: Target BLER: Target BLER



OPLC_SWITCHOPLC_SWITCH

Value range: 0 , 1Value range: 0 , 1

Physical value range: 0 (OFF) , 1 (ON)Physical value range: 0 (OFF) , 1 (ON)

The default value of this parameter is 1, namely ONThe default value of this parameter is 1, namely ON

Comments: When it is checked, RNC updates the uplink SIR TARGET of RLs on the Comments: When it is checked, RNC updates the uplink SIR TARGET of RLs on the

NodeB side by Iub DCH FP signals NodeB side by Iub DCH FP signals

Set this parameter through Set this parameter through SET CORRMALGOSWITCHSET CORRMALGOSWITCH, query it through , query it through LST LST

CORRMALGOSWITCHCORRMALGOSWITCH, and modify it through, and modify it through SET CORRMALGOSWITCHSET CORRMALGOSWITCH

SIRADJUSTFACTORSIRADJUSTFACTOR


Physical value range: 0.1 to 1 , step: 0.1 Physical value range: 0.1 to 1 , step: 0.1

The default value of this parameter is 10, namely 1The default value of this parameter is 10, namely 1

Set this parameter through Set this parameter through SET OPLC / ADD CELLOLPCSET OPLC / ADD CELLOLPC, query it through , query it through LST OPLCLST OPLC, ,

and modify it through and modify it through SET OPLC / SET OPLC / MOD CELLOLPCMOD CELLOLPC



SIRADJUSTSTEPSIRADJUSTSTEP


Physical value range: 0 to 10 , step: 0.001dBPhysical value range: 0 to 10 , step: 0.001dB

Set this parameter through Set this parameter through ADD TYPSRBOLPC / ADD TYPRABOLPCADD TYPSRBOLPC / ADD TYPRABOLPC, query it through , query it through LST LST

TYPSRB / LST TYPRABTYPSRB / LST TYPRAB ,,and modify it through and modify it through MOD TYPSRBOLPC / MOD TYPRABOLPCMOD TYPSRBOLPC / MOD TYPRABOLPC

BLERQUALITYBLERQUALITY

Value range: -63 to 0 Value range: -63 to 0

Physical value range: 5×10^(-7) to 1 Physical value range: 5×10^(-7) to 1

Used the following formula get the parameter integer value : 10×log (BLER)= the value Used the following formula get the parameter integer value : 10×log (BLER)= the value

in tablein table

Set this parameter through Set this parameter through ADD TYPSRBOLPC / ADD TYPRABOLPCADD TYPSRBOLPC / ADD TYPRABOLPC, query it through , query it through LSTLST

TYPSRB / LST TYPRABTYPSRB / LST TYPRAB, , and modify it through and modify it through MOD TYPSRBOLPC / MOD TYPRABOLPCMOD TYPSRBOLPC / MOD TYPRABOLPC

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Date post:	04-Apr-2015
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07- OWJ200103 WCDMA Power Control and Relevant Parameters

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