Idle mode

Idle Mode and Common Channel BehaviorWCDMA RAN

USER DESCRIPTION

Copyright

© Ericsson AB 2008 – All Rights Reserved

Disclaimer

No part of this document may be reproduced in any form without the writtenpermission of the copyright owner.

The contents of this document are subject to revision without notice due tocontinued progress in methodology, design, and manufacturing.

Ericsson shall have no liability for any error or damage of any kind resultingfrom the use of this document.

71/1553-HSD 101 02/6 Uen B 2008-03-14

Contents

Contents

1 Introduction 1

1.1 Scope 1

1.2 Target Groups 1

1.3 Revision Information 1

2 Overview 3

3 Functional Descriptions 5

3.1 PLMN Selection 53.1.1 Service Types 63.1.2 PLMN Selection at Switch-On 73.1.3 Automatic PLMN Selection Mode 73.1.4 Manual PLMN Selection Mode 83.1.5 Roaming 9

3.2 Cell Selection and Reselection 93.2.1 Cell Search Procedure 113.2.2 Cell Selection Procedure 123.2.3 Cell Reselection Procedure 143.2.4 Hierarchical Cell Structures 17

3.3 Location and Routing Area Updating 193.3.1 LA and RA Structure 193.3.2 Normal LA and RA Updating 203.3.3 Periodic LA and RA Updating 203.3.4 IMSI Attach/Detach 20

3.4 Cell Update 21

3.5 URA Update 21

3.6 Paging 223.6.1 Paging in Idle Mode and in state URA_PCH 223.6.2 Paging in the CELL_FACH or CELL_DCH State 243.6.3 Updated System Information Originating from the WCDMA

RAN 24

3.7 System Information 253.7.1 System Information Structure 253.7.2 System Information Update 263.7.3 Changing of Scheduling Information 30

3.8 Access Restriction 303.8.1 Cell Specific Access Restrictions 303.8.2 RNS Wide Access Restrictions 30

4 Engineering Guideline 33

4.1 Cell Selection 33

71/1553-HSD 101 02/6 Uen B 2008-03-14

Idle Mode and Common Channel Behavior

4.2 Cell Reselection 344.2.1 Measurements 344.2.2 Cell Ranking 37

4.3 HCS deployment example 39

4.4 Deployment of an Additional Carrier 42

4.5 GSM to WCDMA Cell Reselection 434.5.1 Measurements 434.5.2 Cell Ranking 44

4.6 Paging 454.6.1 DRX Cycle Length Coefficient in Idle mode 45

4.7 Alternative SIB Scheduling to be applied when domainspecific access restrictions are included in systeminformation 45

4.8 Scheduling Block Deployment 46

4.9 SIB18 Deployment 47

4.10 Load-triggered Access Class Barring 47

5 Parameters 49

5.1 Descriptions 495.1.1 Cell Selection and Reselection 495.1.2 Location and Routing Area Updating 535.1.3 URA Handling 535.1.4 Paging 535.1.5 System Information 545.1.6 Load-triggered Access Class Barring 55

5.2 Values and Ranges 55

Reference List 63

71/1553-HSD 101 02/6 Uen B 2008-03-14

Introduction

1 Introduction

A User Equipment (UE) that is powered on, but does not have a connection tothe radio network, is defined as being in Idle mode. A UE in Idle mode can bothaccess and be reached by the system.

A UE that has an RRC connection is defined as being in Connected mode.A UE in Connected mode using the common channels RACH and FACH isdefined as being in state CELL_FACH. A UE in Connected mode monitoringthe paging channel is defined as being in state URA_PCH. The location ofa UE in state URA_PCH state is known by the WCDMA RAN on a UTRANRegistration area (URA) level.

A more detailed description of the different RRC states can be found inReference [4].

1.1 Scope

This document provides a high-level description of the Idle mode and theConnected mode behavior in state CELL_FACH and URA_PCH. Thecapabilities and the logic of these states are explained. The document alsocontains parameter information related to the functions performed in Idlemode, state CELL_FACH and URA_PCH. Section 4 on page 33 describes theengineering guidelines, which cover practical aspects of the parameter settings.

Abbreviations and terms used in this document are explained in Glossary ofTerms and Acronyms.

1.2 Target Groups

This document is written for the following group of personnel: operators and, asan important starting point, those who want to understand the Idle mode andCommon Channel behavior in greater detail in order to control the functionsand optimize the parameter settings.

It is assumed that users of this document have a working knowledge of 3Gtelecommunication and are familiar with WCDMA.

Personnel working on Ericsson products or systems must have the training andcompetence required to perform their work correctly.

1.3 Revision Information

Apart from editorial changes, this document has been revised according toTable 1 on page 2:

171/1553-HSD 101 02/6 Uen B 2008-03-14


Table 1 Revision History

Revision Reason for Revision P6.0/P6.1

A This is a new document based on 71/1553–HSD101 02/5.

The Functional Description and the Parametersection is updated with information about thefeatures MBMS, Hierarchical Cell Structures(HCS) and the Scheduling Block (SB1).

Both

B Functional Description and Parameters:

• Clarified in section 3.2.4.1 that the following HCSconfiguration is invalid: hcsUsage.idelMode=FALSE; hcsUsage.connectedMode=TRUE

•

Engineering Guidelines:

• HCS deployment example added in section 4.3.

• Recommendations on SB1 deployment addedin section 4.8

• Section 4.5.2 is updated with information aboutthe GSM feature Combined Cell ReselectionTriggering GSM to WCDMA.

• Section 4.4 is updated to give generalengineering guidelines for deployment ofadditional carriers.

Both

Functional Description, Engineering Guidelinesand Parameter section updated with informationabout the features SIB18 for improved PLMNmobility and Load Triggered Access ClassBarring.

P6.1

2 71/1553-HSD 101 02/6 Uen B 2008-03-14

Overview

2 Overview

In Idle mode, the UE has no connection to the radio network, nor is a RadioResource Control (RRC) connection established.

Keeping UEs in Idle mode minimizes the use of resources both for the UEsand in the network. However, the UEs must still be able to access the systemand be reached by the system with acceptable delays. For this, the followingprocedures need to be performed:

• PLMN selection

• Cell selection and reselection

• Location Area (LA) and Routing Area (RA) updating

• Paging

• System information broadcast

PLMN selection performs registration on a selected Public Land MobileNetwork (PLMN).

Cell selection looks for a suitable cell in the selected PLMN.

Cell reselection ensures that the UE camps on the cell that gives the highestprobability for successful monitoring of system and paging information and forsuccessful establishment of a connection.

LA and RA updating is necessary to inform the CN of the current LA or RA ofthe UE, so that the network can send a paging message to the UE.

Paging makes the UE reachable by one or both of the Core Networks (CNs)supported by the PLMN.

System Information Broadcast is required to provide the UE with parametersthat control cell selection and reselection, paging, location and routing areaupdating, access, and other functions.

The following procedures are performed by Connected mode UEs in stateCELL_FACH and URA_PCH:• Cell selection and reselection• Paging• Reading of system information• Cell Update• URA Update (only in state URA_PCH)• PLMN selection

371/1553-HSD 101 02/6 Uen B 2008-03-14


4 71/1553-HSD 101 02/6 Uen B 2008-03-14

Functional Descriptions

3 Functional Descriptions

The tasks performed by Idle mode UEs and Connected mode UEs using thecommon channels can be divided in the following seven processes:

• PLMN selection

• Cell selection and reselection

• LA and RA registration

• Paging procedure

• Reading system information

• Cell Update

• URA Update

Figure 1 on page 5 illustrates the relationship between PLMN selection, cellselection and reselection, and LA and RA registration.

PLMN Selection

U 00 00073

Automatic and Manual mode selection

PLMN selected

Registration area changes

PLMNsavailable

Indicationto user

Cell Selection and Reselection

LA and RA Registration

LR responses

Figure 1 Relationship between PLMN Selection, Cell Selection andReselection, and LA and RA Registration

3.1 PLMN Selection

The UE will select a PLMN at power-on or upon recovery from lack of coverage.It will first try to select and register on the last registered PLMN if one exists. Ifregistration on a PLMN is successful, the UE shows this PLMN on the display,

571/1553-HSD 101 02/6 Uen B 2008-03-14


and it is now allowed to perform or receive services from an operator. If there isno last registered PLMN, or if it is unavailable, the UE will try to select anotherPLMN either automatically or manually depending on its operating mode. Theautomatic mode utilizes a list of PLMNs in an order of priority, whereas themanual mode leaves the decision to the user and only shows the availablePLMNs.

The UE normally operates on its home PLMN. Another PLMN may be selectedif, for example, the UE loses coverage. The UE will register on a PLMN in orderto find a suitable cell to camp on. Registration has to be successful in order forthe UE to be able to access the network.

Section 3.1.1 on page 6 to Section 3.1.5 on page 9 describe how the UEattempts to select and register on a PLMN.

For a more detailed description of the PLMN selection process, see Reference[2].

3.1.1 Service Types

Camping on a cell is necessary for the UE to get access to some servicesin the network. The following three types of services are defined for the UEin Idle mode:

• Limited service, which allows the UE to make emergency calls only

• Normal service, for public use on a suitable cell

• Operator-related services, which allow the operator to test newly deployedcells without being disturbed by normal traffic.

The operator can establish cell access restrictions using the cellReservedparameter that allows the reservation of a cell for operator use only. It is alsopossible to restrict access for certain Access Classes using the parameteraccessClassNbarred. Both parameters are sent in the system information.

A UE obtains limited service when it camps on an acceptable cell. If the cellselection criteria are fulfilled, the cell is considered acceptable.

A cell that allows normal service is defined as a suitable cell. A cell is suitablewhen the following criteria are fulfilled:

• The cell belongs to the selected PLMN.

• The cell selection criteria are fulfilled.

• The cell is not a part of a forbidden registration area.

6 71/1553-HSD 101 02/6 Uen B 2008-03-14


3.1.2 PLMN Selection at Switch-On

Whenever a UE is switched on or enters an area with acceptable coverage aftercoverage loss, it attempts to camp on the last registered PLMN or equivalentPLMN, if available. To speed up the PLMN selection procedure, the UE usesinformation about the last registered PLMN, such as carrier frequencies orthe list of neighboring cells stored in the USIM before the UE was switchedoff. On each stored carrier frequency, the UE searches first for the strongestsignal cell and reads its system information to verify the PLMN to which the cellbelongs. It also reads the system information for PLMN identity, which consistsof mcc and mnc. Then the UE decides whether the chosen cell is acceptable orwhether at least one acceptable cell belonging to that PLMN exists. Finally,the UE attempts registration if the PLMN is allowed.

If the last registered PLMN is not available, a registration attempt fails. Ifthere is no registered PLMN stored in the USIM, the UE selects and attemptsregistration on other PLMNs using either the Automatic mode or the Manualmode.

3.1.3 Automatic PLMN Selection Mode

The Automatic PLMN selection mode is described in Figure 2 on page 8.

In Automatic mode, if no last registered PLMN exists or is available, the UE willselect a PLMN that is available and allowed, in the following order:

1. Home PLMN (HPLMN), if not previously selected, according to the RadioAccess Technologies (RATs) supported by the UE.

2. Each PLMN in the user-controlled PLMNs list in the USIM, if present, inorder of priority, according to the RATs supported by the UE

3. Each PLMN in the operator-controlled PLMNs list in the USIM, in order ofpriority, according to the RATs supported by the UE

4. Other PLMNs, according to the high-quality criterion, in random order

5. Other PLMNs that do not fulfill high-quality criterion, in order of decreasingsignal strength (SS)

PLMNs are considered high quality if the Received Signal Strength CodePower (RSCP) on the CPICH fulfills the high-quality criterion. The high-qualitycriterion is fulfilled when CPICH RSCP level is greater than or equal to –95(dBm). For GSM cells the high-quality criterion is fulfilled when the signal levelis above –85 (dBm).

A PLMN with at least one acceptable cell is considered available. If that PLMNis allowed, the UE tries to register on it. If registration is successful, the UEdisplays the selected PLMN.

771/1553-HSD 101 02/6 Uen B 2008-03-14


When the UE cannot register on any PLMN in the user and operator lists, itattempts to register on other PLMNs according to the high-quality criterion. Ifthe UE cannot register on any PLMN, it selects an available PLMN and enters alimited service state. If it does not find an available PLMN, the UE enters thenon-service state, and waits until a new PLMN is available and allowed.

UE Switch on

UE tries to register on the selected

PLMN UE selects an available PLMN Id according to the list stored in priority order

U 00 00075

Sucessful Registration

Yes

Yes

UE tries to register on the selected

PLMN?

No

No

NoYes

UE selects the last registered PLMN

UE checks ifthe PLMN is available (that is tries to find an

acceptable cell)

Figure 2 PLMN Selection-Automatic Mode

3.1.4 Manual PLMN Selection Mode

The Manual mode allows the user to select a PLMN among those indicatedby the UE. The UE displays all PLMNs that it finds by scanning all frequencycarriers. The UE displays those PLMNs that are allowed as well as those thatare not allowed. The user makes a manual selection, according to the availableaccess technology for the chosen PLMN, and the UE attempts registration onthis PLMN, ignoring the contents of the forbidden Location Area Identities (LAIs)and PLMN lists. If the user selects an available PLMN in the forbidden PLMN

8 71/1553-HSD 101 02/6 Uen B 2008-03-14


list, the UE attempts to register and may receive a positive acknowledgementfrom the CN. In this case, the PLMN is removed from the forbidden list.

If the user does not select a PLMN, the selected PLMN is the one that wasselected before the PLMN selection procedure started. If this PLMN is nolonger available, the UE attempts to camp on an acceptable cell at any PLMNand enters the limited service state. The UE remains in that state until it isswitched off or the user makes a manual PLMN reselection.

3.1.5 Roaming

Roaming is a service through which a UE is able to obtain services fromanother PLMN in the same country (national roaming area) or another country(international roaming area). The behavior that the UE must follow is specifiedby agreements among the network operators. A UE in Automatic mode, havingselected and registered on a Visited PLMN (VPLMN) in its home country,periodically attempts to return to its HPLMN.

The time interval between consecutive attempts is stored in the USIM and ismanaged by the network operator using a timer. The timer may have a value ofbetween 6 minutes and 8 hours, with a step size of 6 minutes. In the absenceof a fixed value, a default value of 30 minutes is used by the UE.

3.2 Cell Selection and Reselection

The Cell Selection and Reselection Process described in this section appliesto WCDMA cells. A more detailed specification of the process can be foundin Reference [3].

The cell selection and reselection process allows the UE to look for a suitablecell in the selected PLMN and to camp on it. When a suitable cell is found,the UE camps on it in a state defined as “camped normally”. In this state,the UE monitors paging and system information, performs periodical radiomeasurements, and evaluates cell reselection criteria. If the UE finds a bettercell, that cell is selected by the cell reselection process. The change of cell mayimply a change of the RAT.

The WCDMA RAN is sensitive to intra frequency interference, which maydepend on the data rate, traffic load, or modified radio link due to multipathfading. Therefore, the measurements that are used in the cell selection andreselection process are not only the signal strength but also the quality value.These measurements are performed on the Common Pilot Channel (CPICH).

Two different strategies, initial cell selection and stored information cellselection, can be used in the cell selection process, as shown in Figure 3 onpage 10.

971/1553-HSD 101 02/6 Uen B 2008-03-14


U 00 00074

InitialCell Selection

Camped normally

CellReselection

Process

no suitable cell found

suitable cell found

Stored Information

Cell Selection

measurementsevaluation suitable

cell selected

Cell Selection when leaving

connected mode

location registration failed

Start

Connectedmode

suitable cell found

no suitablecell found

Camped on anacceptable cell

(Limited service)

no suitablecell found

In Automatic mode, new

PLMN selection

acceptablecell found

Figure 3 Cell Selection and Reselection Procedure

Initial cell selection is used if the UE has no knowledge of the WCDMA radiofrequency channels. Stored information cell selection is used if the UE knowsthe carrier frequencies that have previously been used.

The UE must synchronize with the WCDMA RAN to read system information onthe BCCH to select a PLMN and to find a suitable cell.

The cell search procedure in Section 3.2.1 on page 11 performs thesynchronization between the UE and the WCDMA RAN.

For a more detailed specification of the Cell Selection and Reselection Process,see Reference [3].

10 71/1553-HSD 101 02/6 Uen B 2008-03-14


3.2.1 Cell Search Procedure

The cell search procedure allows the UE to acquire slot and framesynchronization and to get the downlink primaryScramblingCodeassociated with the cell using the Synchronization Channel (SCH).

The physical channels involved in the cell search procedure are the PrimarySynchronization Channel (P-SCH), the Secondary Synchronization Channel(S-SCH), and the CPICH. The procedure is based on the following steps, whichare also shown in Figure 4 on page 11.

Start

Detecting slot synchronization

Detecting frame synchronization and primary

scrambling code group

Detecting primary scrambling code (cell) and

beginning System Information reading

U 00 00076

End

Figure 4 Cell Search Procedure

1. The UE acquires slot synchronization by correlating the information on theP-SCH with primary synchronization code, which is common to all cells,and by detecting peak values at the matched filter output.

2. The UE obtains frame synchronization and determines the scramblingcode group of the cell (made up by eight primary scrambling codes) bycorrelating the information on the S-SCH with all secondary synchronizationcode sequences and by detecting the peak value, since the cyclic shiftsof sequences are unique.

3. The UE determines the primaryScramblingCode by correlating theCPICH with all codes within the scrambling code group identified in Step 2on page 11. When the primary scrambling code has been identified, thePrimary Common Control Physical Channel (P-CCPCH) will be detectedand the UE is able to read the information on the BCCH.

1171/1553-HSD 101 02/6 Uen B 2008-03-14


The need for execution of all or part of the cell search procedure depends onthe information, such as primary scrambling code group, stored in the UE if theUE was previously registered on the PLMN.

3.2.2 Cell Selection Procedure

If the UE does not find a suitable cell of the PLMN on which it was previouslyregistered, and it has already used the stored information cell selectionprocedure, the initial cell selection procedure is started. This procedure doesnot require knowledge of radio frequency channels in the WCDMA band. TheUE scans all WCDMA radio frequency channels to find a suitable cell. On eachcarrier, the UE searches for the cell with the highest signal level, according tothe cell search procedure, and reads the system information on the BCCH.The information on this channel is mapped to one Master Information Block(MIB) and some System Information Blocks (SIBs). The UE reads the PLMNidentity, formed by the mcc and the mnc sent in the MIB, and determines thecell to which PLMN belongs.

The UE verifies that all requirements for a suitable cell are fulfilled. In particular,it checks whether the cell selection criteria are fulfilled. If the UE does notfind a suitable cell, it attempts to camp on the strongest acceptable cell andobtain limited service. In this state, the UE tries regularly to find a suitable cellaccording to the RATs supported by the UE. In automatic PLMN selection,this consists of a new PLMN selection.

On the BCCH, the UE receives information, such as the carrier frequencyuarfcn in the downlink and in the uplink, belonging to the selected PLMN. TheUE also reads the neighboring cell list to make measurements on adjacentcells, to verify whether a better cell exists than the serving cell.

When the UE has information on carrier frequencies of the PLMN previouslystored on the USIM, it may use the stored information cell selection procedure.The UE may have other information, such as the primary scrambling codegroup or the neighboring cells list stored on the USIM before UE switch-off orleaving a coverage area. This information simplifies the cell search procedureand speeds up the search for a suitable cell. After synchronization, the UEreads system information on the BCCH. If all requirements for a suitable cellare fulfilled, the UE selects that cell and tries to register.

A suitable cell must fulfill the cell selection criteria. The UE bases its evaluationon two quantities: Squal and Srxlev. The Squal quantity has been introducedto evaluate the Signal to Interference Ratio (SIR) on the CPICH, expressedin terms of Signal to Noise Ratio in the CPICH (CPICH Ec/No). In order toevaluate whether cell selection criteria (S-criteria) are fulfilled, the UE calculatesthe following:

Squal = Qqualmeas-qQualMin (only for WCDMA cells)

Srxlev = Qrxlevmeas-qRxLevMin - Pcompensation (for all cells)

Where:

12 71/1553-HSD 101 02/6 Uen B 2008-03-14


Qqualmeas is the quality value for the received signal, expressed in CPICHEc/No (dB) and measured by the UE.

Cell parameter qQualMin indicates the minimum required quality value in thecell. It is sent in system information, in SIB3 for the serving cell, and in SIB11for adjacent cells.

Qrxlevmeas is the received signal strength measured by the UE and expressedin CPICH RSCP (dBm).

Cell parameter qRxLevMin indicates the minimum required signal strength inthe cell. It is sent in SIB3 for the serving cell and in SIB11 for adjacent cells.

Pcompensation = max (maxTxPowerUl - P, 0);

P is the maximum RF output power of the UE according to its class.Pcompensation is introduced for UEs that cannot transmit at maximum poweron the RACH in the cell. The cell range decreases for those UEs. The cellparameter maxTxPowerUl indicates the maximum allowed transmission powerwhen the UE accesses the system on RACH. It is broadcast in SIB3.

The S-criteria are fulfilled when:

Squal > 0 and

Srxlev > 0

If all other requirements for a suitable cell are fulfilled, the UE attempts toregister and, if necessary, performs LA or RA updating. If the UE finds asuitable cell, it camps on the cell in the state “camped normally”. In this state,the UE periodically evaluates whether a neighboring cell is better than theserving one by making Intra-frequency, Inter-frequency, and inter-systemradio measurements.

The UE attempts to make a cell selection in order to find a suitable cell onwhich to camp in the following cases:

• When a UE is switched on

• When a UE in Idle mode has had a number of failed RRC connectionrequests

• When a UE returns to Idle mode from the Connected mode on commonchannels (CELL_FACH state) after a number of failed cell update attempts

• When a UE moves from dedicated mode to Idle mode

The candidate cells for cell selection are the ones used immediately beforeleaving Connected mode. If no suitable cell is found, the UE can use storedinformation cell selection procedure to find a suitable cell.

• When a UE returns to Idle mode after an emergency call on any PLMN

1371/1553-HSD 101 02/6 Uen B 2008-03-14


The UE selects an acceptable cell on which to camp. In this case,candidate cells for cell selection are the ones used immediately beforeleaving the Connected mode. If no acceptable cell on that PLMN is found,the UE continues to search for an acceptable cell on any PLMN.

• When a UE moves from dedicated mode to state CELL_FACH orURA_PCH.

3.2.3 Cell Reselection Procedure

3.2.3.1 General

When camping on a cell, the UE shall continuously search for a better cellaccording to the cell reselection criteria. In order to perform cell ranking, the UEmeasures the serving cell and neighbor cells listed in SIB11 according to themeasurement rules described in Section 3.2.3.2 on page 14.

All measured cells fulfilling the S-criteria as defined in Section 3.2.2 on page 12are ranked according to the R-criteria described in Section 3.2.3.3 on page 16.If the UE finds a more suitable cell it reselects onto that cell and camps on it.

Note that separate measurement rules and cell reselection criteria apply forthe UE if HCS is used in the cell. This is further described in Section 3.2.4on page 17.

The high mobility state as specified in Reference [3] is not supported.

3.2.3.2 Measurement rules for cell reselection

The decision about when intra-frequency measurements are performed is madeusing the sIntraSearch parameter in relation to Squal:

• If the Squal value is greater than the value for sIntraSearch, the UEdoes not need to perform intra-frequency measurements.

• If the Squal value is less than or equal to the sIntraSearch value, the UEperforms intra-frequency measurements.

• If the value for sIntraSearch is not sent to the serving cell, the UEperforms intra-frequency measurements.

The decision about when inter-frequency measurements are performed is madeusing the sInterSearch parameter in relation to Squal:

• If the Squal value is greater than the value for sInterSearch, the UEdoes not need to perform inter-frequency measurements.

• If the Squal value is less than or equal to the sInterSearch value, the UEperforms inter-frequency measurements.

14 71/1553-HSD 101 02/6 Uen B 2008-03-14


• If the value for sInterSearch is not sent for the serving cell, the UEperforms inter-frequency measurements.

If a UE has selected a MBMS service that is currently ongoing measurementsshall be performed on inter-frequency cells belonging to the MBMS Preferredlayer even if the Squal value is greater than the value for sInterSearch

The decision about when GSM measurements are performed is made usingthe sRatSearch parameter in relation to Squal and the sHcsRat parameter inrelation to Srxlev:

• If the Squal value is greater than the value for sRatSearch and the Srxlevvalue is greater than the value for sHcsRat, the UE does not need toperform measurements on GSM cells.

• If the Squal value is less than or equal to the sRatSearch value and/or theSrxlev value is less than or equal to the sHcsRat value, the UE performsmeasurements on GSM cells.

Note that only UEs supporting 3GPP Rel- 5 CR 130 on TS 25.304 are ableto base the start of GSM measurements on both CPICH Ec/N0 and CPICHRSCP (using both sRatSearch and sHcsRat). Other UEs will only usethe CPICH Ec/N0 condition (Squal <= sRatSearch) to decide when to startmeasurements of GSM neighbors.

In state CELL_FACH, the parameters fachMeasOccaCycLenCoeff andinterFreqFddMeasIndicator are used to control the UE measurementactivities for inter-frequency and inter-RAT neighbors.

If fachMeasOccaCycLenCoeff is set to a value > 0, the UE performsinter-frequency and inter-RAT measurements during FACH measurementoccasions. FACH measurement occasions are defined as being the frameswhere the following equation is fulfilled:

SFN = C-RNTI mod n * 2^k, n = 0, 1, 2, etc

k is an integer defined by the parameter fachMeasOccaCycLenCoeff

C-RNTI is the cell UE identity (16 bits)

If the UE (according to its measurement capabilities) is able to performinter-frequency and/or inter-RAT measurements simultaneously as receivingthe SCCPCH of the serving cell, it may also perform measurements on otheroccasions than specified above.

If fachMeasOccaCycLenCoeffis set to 0, the parameter is not sent in systeminformation and the UE is not allowed to leave the SCCPCH in order to performmeasurements on other frequencies and RATs.

If the parameter interFreqFddMeasIndicator is set to TRUE, the UE willevaluate cell reselection criteria on inter-frequency cells in state CELL_FACH.

1571/1553-HSD 101 02/6 Uen B 2008-03-14


If the parameter interFreqFddMeasIndicator is set to FALSE, the UEwill neither perform measurements nor evaluate cell reselection criteria oninter-frequency cells in state CELL_FACH.

3.2.3.3 Cell reselection criteria

The UE shall perform ranking of all measured cells fulfilling the cell selectioncriteria (S-criteria) as defined in Section 3.2.2 on page 12. Only those cellsthe UE is mandated to measure according to the measurement rules shallbe considered for cell ranking

The cells are ranked according to the R-criteria:

R(serving) = Qmeas(s) + qHyst(s) + Qoffmbms

R(neighbor) = Qmeas(n) - qOffset(s,n) + Qoffmbms - TO(n)

Qmeas is the quality value of the received signal, which is derived from theaverage CPICH Ec/N0 or CPICH RSCP level for WCDMA cells and from theaverage received signal level for GSM cells. (s) and (n) denotes the servingand the neighbor cell values respectively.

qHyst(s) is the hysteresis value that is read in system information of the servingcell. The value is set by the configurable parameters qHyst1 used when theranking is based on CPICH RSCP and qHyst2 used when the ranking isbased on CPICH Ec/N0.

qOffset(s,n) is the offset between the serving cell and the neighbor cell and canbe used to move the border between two cells. The value is defined per cellrelation and is set by the configurable parameters qOffset1sn used when theranking is based on CPICH RSCP and qOffset2sn used when the ranking isbased on CPICH Ec/N0.

Qoffmbms is an offset applied to cells belonging to the MBMS Preferred layer.The value is defined by the parameter qualityOffset and is signalled tothe UE on the MBMS control channel MCCH. The offset is used by the UE toprioritize cells on a frequency layer on which the MBMS service is transmittedand shall be applied to the R-criteria only when this service is ongoing. Theprocess is called Frequency Layer Convergence and is further described inMBMS.

TO(n) is a temporary offset applied to the R criteria only if HCS is used in theserving cell, see Section 3.2.4 on page 17 for more details.

Ranking of GSM neighbors is always made using the measurement quantityCPICH RSCP. For WCDMA neighbors it is possible to control whether theranking is made using CPICH RSCP or CPICH Ec/N0. This is configured usingthe cell parameter qualMeasQuantity.

If both WCDMA and GSM cells fulfill the S criteria, a first ranking is made usingthe measurement quantity CPICH RSCP. If a GSM cell is ranked as the bestcandidate, the UE performs cell reselection to that cell. If a WCDMA cell is

16 71/1553-HSD 101 02/6 Uen B 2008-03-14


ranked as the best candidate and the measurement quantity for cell reselectionis set to CPICH RSCP, the UE performs cell reselection to that cell.

If a WCDMA cell is ranked as the best candidate and the measurement quantityfor cell reselection is set to CPICH Ec/N0, the UE performs a second ranking ofthe WCDMA cells based on CPICH Ec/N0.

The UE reselects the new cell if it is better ranked than the serving cell during atime interval treSelection.

3.2.4 Hierarchical Cell Structures

3.2.4.1 General

The feature Hierarchical Cell Structures (HCS) makes it possible to controlcamping of UEs in Idle mode and in states CELL_FACH and URA_PCH, notonly according to best cell using the measurement quantity CPICH RSCP orCPICH Ec/N0, but also according to cell hierarchy. If the feature is activatedseparate measurement rules and cell reselection criteria as defined in Section3.2.4.2 on page 18 and Section 3.2.4.3 on page 18 are applied by the UE.

The use of HCS is controlled by the cell parameters hcsUsage.idleModeand hcsUsage.connectedMode. The values are signaled to the UE insystem information SIB11 and SIB12. If the parameter hcsUsage.idleModeis set to TRUE, the idle mode UE will apply the HCS measurement rulesand cell reselection criteria as defined in this section. If the parameterhcsUsage.connectedMode is set to TRUE the connected mode UE in stateCELL_FACH and URA_PCH will apply the HCS measurement rules and cellreselection criteria as defined in this section.

Note that the following setting is not a valid HCS configuration:

hcsUsage.idleMode = FALSE

hcsUsage.connectedMode = TRUE

With this setting the HCS neighbor cell information can not be broadcast tothe UE in SIB11 and the UE will not apply HCS rules in state CELL_FACH orURA_PCH.

The HCS priority level is defined by an integer between 0 and 7. HCS prioritylevel 0 is the lowest priority and level 7 is the highest priority.

The HCS priority level for the serving cell is configurable and set bythe parameter hcsSib3Config.hcsPrio. The HCS priority level forinter-frequency neighbor relations is configurable and set by the parameterhcsSib11Config.hcsPrio. For intra-frequency and GSM cell relationsno HCS priority level can be configured and the default value according toReference [4] applies, i.e. HCS priority level = 0.

1771/1553-HSD 101 02/6 Uen B 2008-03-14


If the UE has selected a MBMS service that is currently ongoing the UE addsan offset to the normal HCS priority for all cells (serving and neighbor cells)belonging to the MBMS Preferred layer. The offset is configurable and setby the cell parameter hcsPrioOffset. The value is signaled to the UE onthe MBMS control channel MCCH.

Hierarchal Cell Structures is a license controlled feature, and a software key isnecessary for activation. For more information see Handling of License Control.

3.2.4.2 Measurement rules for cell reselection when HCS is used

The measurement rules for cell reselection when HCS is used is specified inReference [3], section 5.2.6.1.2.

The following parameters controlling the measurement rules are configurable inthe network and sent to the UE in system information SIB3:

Table 2 Parameters controlling the measurement rules for cell reselectionwhen HCS is used

Parameter name in 25.304 Corresponding operator configurableparameter name

SinterSearch sInterSearch

SintraSearch sIntraSearch

SsearchHCS hcsSib3Config.sSearchHcs

Slimit,SearchRAT sRatSearch

SHCS,RAT sHCSRat

For more details regarding value range etc, see Section 5.2 on page 55.

3.2.4.3 Cell reselection criteria when HCS is used

The quality level threshold criterion for HCS (H-criteria) is used to determinewhether prioritized ranking shall apply. The H-criteria is defined by:

H(s) = Qmeas(s) – Qhcs(s)

H(n) = Qmeas(n) – Qhcs(n) – TO(n)

Qhcs specifies the quality threshold level for applying the prioritized ranking.(s) and (n) denotes the serving and neighbor cell values respectively. Theserving cell value is set by the configurable parameter hcsSib3Config.qHcs.Qhcs for Inter-frequency cell relations is set by the configurable parameterhcsSib11Config.qHcs. For intra-frequency and GSM cell relations thedefault value according to Reference [4] applies, i.e. Qhcs(n) = 0.

TO(n) specifies the temporary offset applied to the H-criteria for a duration ofPENALTY_TIME(n) after a timer T(n) has been started. See Reference [3],section 5.2.6.1.4 for more details regarding the start and stop of this timer.

18 71/1553-HSD 101 02/6 Uen B 2008-03-14


The temporary offset is only applied for inter-frequency neighborrelations and the value is set by the configurable parametershcsSib11Config.temporaryOffset1 used if the quality measure is RSCPand hcsSib11Config.temporaryOffset2 used if the quality measure isEc/N0. The timer T(n) is configurable for inter-frequency cell relations and setby the parameter hcsSib11Config.penaltyTime. For intra-frequency andGSM cell relations no temporary offset is applied.

The UE shall perform ranking of all cells with highest HCS_PRIO among themeasured cells fulfilling the S- and H-criteria (S > 0 and H ≥ 0). If no cell fulfilsthe H-criteria, the UE shall not consider the HCS priority when ranking the cells.

The cells shall be ranked according to the R-criteria specified in section Section3.2.3.3 on page 16. When HCS is used a temporary offset, TO(n), is appliedto the R-criteria. The temporary offset is controlled using the same set ofparameters as specified for the H-criteria above. Furthermore, if the Qoffmbmsis applied to the R-criteria the UE shall use the value “infinity” for this parameter(even if another value is signalled on the MBMS control channel MCCH).

3.3 Location and Routing Area Updating

After a UE has found a suitable cell and can access services requiringregistration, it tries to register on the chosen PLMN. If the Location Area Identity(LAI) or Routing Area Identity (RAI), read on system information, is differentfrom the one stored on the USIM before UE switch-off, the UE performs a LAor RA registration update. When a UE in Idle mode moves into a new cell ina new LA or RA or into a new PLMN, it performs a registration area update.The LA or RA update procedure is managed by the CN and is transparentto the WCDMA RAN.

The three types of registration update are normal, periodic, and IMSI attach ordetach.

For a more detailed specification of the Location and Routing Area updating,see Reference [2].

3.3.1 LA and RA Structure

The LA is an area to which the CN sends a paging message for circuit switchedservice and the RA is an area to which the CN sends a paging message forpacket switched services. Each area, LA or RA, may consist of cells of one ormore RNC, which are connected to the same core network. The RA is requiredif the RNC is connected to a packet switched CN. Note that each cell couldbelong to only one LA and one RA.

• The LA is identified by an LAI, formed by a PLMN Identity and a LocationArea Code (lAC)

• The RA is identified by an RAI, formed by an LAI and a Routing AreaCode (rAC)

1971/1553-HSD 101 02/6 Uen B 2008-03-14


These parameters are sent in the system information.

3.3.2 Normal LA and RA Updating

A UE executes a normal registration update when, in a cell belonging to a newLA or RA, it is switched on or leaves the Connected mode. Normal registrationupdate is also performed when the UE, in Idle mode, moves in a cell belongingto a new LA or RA, or when the UE is unknown to the CN. The UE reads theLAI and the RAI in the system information and detects that one or both of thereceived area identities differ from the ones stored on the USIM. If the LAIreceived from the system information is not in the forbidden LAIs list, an LAand/or RA update request is sent by the UE to the WCDMA RAN. If the LAI isforbidden, the UE tries to select another cell belonging to a permitted LAI oranother PLMN.

3.3.3 Periodic LA and RA Updating

Periodic LA and RA updating is used to notify the network of the UEsavailability, and to avoid unnecessary paging attempts for a UE that has lostcoverage and is not able to inform the CN that it is inactive.

The periodic LA update procedure is controlled by a timer, called t3212, whichgives the time interval between two consecutive periodic location updates. Thevalue is sent by the WCDMA RAN to UEs on the BCCH.

The periodic RA update is controlled by a timer, called t3312, which gives thetime interval between two consecutive periodic routing updates. The value ofthe timer is sent by the CN to the UE in the IMSI attach or in the routing areaupdate message accept (this is not a radio parameter).

3.3.4 IMSI Attach/Detach

A location registration request indicating IMSI attach is made when the UEis activated in the same LA in which it was deactivated, and the systeminformation indicates that IMSI attach/detach is used. The IMSI attach/detachprocedure allows the UE to avoid unnecessary paging attempts from the CN.It is managed by the cell parameter att sent on the BCCH. This parameterinforms the UE whether the IMSI attach/detach procedure is to be applied. Ifthe parameter att is set to 1, the UE sends an “attach” or “detach” messageto the CN when it is powered on or off indicating whether the UE is active orinactive in the network.

The CN avoids performing paging attempts when IMSI detach is applied andthe UE is switched off.

When the UE is switched on and the IMSI attach/detach procedure is applied,the UE performs a location registration request, indicating IMSI attach, if it isin the same LA or RA in which it was switched off. If the registration area ischanged, a normal LA update is performed by the UE.

20 71/1553-HSD 101 02/6 Uen B 2008-03-14


3.4 Cell Update

In state CELL_FACH, the procedure Cell Update is used to keep WCDMARAN informed about the UEs location on a cell level. Cell Update is initiatedin the following cases:

• A UE in state CELL_FACH enters a new cell.

• As part of a supervision mechanism, Cell Update is performed periodicallyby UEs in state CELL_FACH. The periodicity is controlled by the timert305, see Connection Handling.

• If a UE in state CELL_FACH re-enters the service area after having beenout of coverage when a periodic Cell Update should have been sent.

The Cell Update procedure is also initiated by the UE in the following cases:

• A UE in state URA_PCH has uplink data to transmit

• A UE in state URA_PCH state is paged by the network. The page canbe either UTRAN or CN initiated.

• A UE in state CELL_FACH detects RLC unrecoverable error in an AMRLC entity.

3.5 URA Update

In state URA_PCH, the procedure URA Update is used to keep WCDMA RANinformed about the UEs location on a URA level. URA Update is initiated in thefollowing cases:

• A UE in state URA_PCH enters a new cell not belonging to the same URAthat the UE is registered in.

• The UE enters a cell that has no URAs defined. This will trigger a releaseof the RRC Connection and the UE enters Idle mode.

• As part of a supervision mechanism, URA Update is performed periodically.The periodicity is controlled by the timer t305, see Connection Handling

In the response to the URA Update, WCDMA RAN selects which URA the UEshall be registered to. Also for periodical URA Updates, where the UE mightnot have moved, the selected URA has to be specified by the network.

System Information Block Type 2 contains the URA identities of the URAsconfigured in the cell. Note that the same cell can belong to maximum 4different URAs.

2171/1553-HSD 101 02/6 Uen B 2008-03-14


3.6 Paging

The purpose of this function is to enable the CN to page a UE for a terminatingservice request or for the WCDMA RAN to inform all UEs that the systeminformation has been modified. The function is also used by the WCDMA RANto initiate a channel switch from state URA_PCH to state CELL_FACH.

A UE may be paged when it is in Idle mode, in CELL_FACH state, URA_PCHand in CELL_DCH state. For UEs in CELL_FACH state and CELL_DCH state,the paging message is sent on the dedicated control channel.

For UEs in Idle mode, the paging message is broadcast in an LA, a RA, or aglobal RNC area. Paging messages are sent in all cells in an LA or RA, so itis necessary to find a trade-off between the number of LA or RA registrationattempts and the paging load. The paging load will increase with larger LA andRA while the registration load will decrease with larger LA and RA.

For UEs in state URA_PCH, the paging message is sent in all cells belongingto the URA where the UE is currently registered.

3.6.1 Paging in Idle Mode and in state URA_PCH

When the UE is in Idle mode or in state URA_PCH, two different physicalchannels are used in order to exchange proper information between theWCDMA RAN and the UE: the PICH and the S-CCPCH (carries the PCH).There is a fixed timing relation between a PICH frame and the associatedS-CCPCH frame. Figure 5 on page 22 illustrates this timing relation.

PICH frame containing paging indicators

Associated S-CCPCH frame

U 00 00068

TPICH

Figure 5 Timing between Paging Indicator and Paging Message

The PICH is used to indicate to the UE when it should read the S-CCPCH.PCH is used to carry the RRC message “Paging type 1”, which contains theactual paging information. The number of times the WCDMA RAN will transmitthe paging information to a UE is determined by the configurable parameternoOfPagingRecordTransm.

22 71/1553-HSD 101 02/6 Uen B 2008-03-14


Discontinuous Reception

The UE listens to the PICH only at certain predefined times, reducing powerconsumption. The periodicity of these searches is set by the system and thetime interval is called Discontinuous Reception (DRX) cycle. Different DRXcycles are used for circuit switched and packet switched services in Idle mode.A separate DRX cycle is also used to page Connected mode UEs in stateURA_PCH.

Each PICH frame consists of a number of paging indicators. The UEs aredivided in a number of groups and each group reads a specific paging indicatorthat tells whether the associated UE should read the S-CCPCH. If a pageindicator is set to 1, there can be a paging message on the S-CCPCH for thecorresponding UE.

If a certain paging indicator indicates that there is a page, all UEs in that groupgo to read the Paging type 1 message that may contain one or more pagingrecords. Each paging record contains IMSI (or TMSI or P-TMSI) to identifywhich UE is paged. See Reference [3] for more details.

The paging occasion specifies times when a UE should monitor its pagingindicator. The paging occasion is calculated using IMSI and DRX Cycle Length.Figure 6 on page 24 shows the paging occasions for four different UE whereeach has its own specific IMSI and different DRX cycle lengths. The time periodbetween two consecutive paging occasions is calculated as follows:

DRX cycle length = 2k*10 (ms)

Where:

k Integer defined by the cnDrxCycleLengthCsparameter for circuit-switched services and bythe cnDrxCycleLengthPs for packet-switchedservices. For paging of Connected mode UEs in stateURA_PCH, k is an integer defined by the parameterutranDrxCycleLength.

10 ms Period equal to the system frame number (SFN)duration, which is the time interval between twoconsecutive SFNs

2371/1553-HSD 101 02/6 Uen B 2008-03-14


SFN: 64... 96 128 160 192 224 256 288 320 ...

a) k=6, IMSI1

b) k=6, IMSI2

c) k=9, IMSI3

d) k=9, IMSI4

U 00 00067

DRX cycle length (=640ms)




Figure 6 Paging Occasions

The RNC may be connected to two different CN domains that may use differentDRX cycle lengths to page UEs in Idle mode. These are broadcast in thesystem information. A UE that is attached to both CN domains uses theshortest of those DRX cycle lengths.

A UE may also choose an individual packet switched DRX cycle and issue arequest to the CN to be paged with that DRX cycle length when it is in Idlemode. This procedure is transparent to the WCDMA RAN.

The DRX cycle to be used in Connected mode (state URA_PCH) is sent to theUE using dedicated messages. The same value applies for both CN initiatedand UTRAN initiated paging in state URA_PCH.

3.6.2 Paging in the CELL_FACH or CELL_DCH State

When a connection exists between the WCDMA RAN and the UE, the SRNCdetermines that a RRC connection has already been established by this UEand the RRC message “Paging type 2” is used to carry paging information.Since it is sent on a dedicated control channel, this message is intended onlyfor one particular UE.

3.6.3 Updated System Information Originating from the WCDMA RAN

The RRC paging procedure sends consecutive “Paging type 1” messages for aperiod of time sufficient for the UE, using maximum possible DRX cycle length,to get this information at least once. The number of times a UE (that usesmaximum possible DRX cycle length) hears the updated system informationis defined by the parameter noOfMaxDrxCycles.

24 71/1553-HSD 101 02/6 Uen B 2008-03-14


3.7 System Information

The purpose of system information distribution is to broadcast systeminformation to the UEs in the cells of the WCDMA RAN so the UEs can read anduse this information for proper access to the system. The system information isregularly broadcast to the UE on the BCCH. It contains parameters related tofunctions such as Cell Selection and Reselection, Measurement Management,Location and Routing Registration, Handover, and Power Control. When aparameter in the system information is changed, all UE in a cell are notified bya paging message or by a system information change indication message.

System information is read and used by UEs in Idle mode and UEs inCELL_FACH and URA_PCH state.

3.7.1 System Information Structure

The system Information elements are broadcast in System Information Blocks(SIBs). An SIB groups system information elements related to the same kind ofactivity control. Different types of SIB exist, and each type contains a specificcollection of information. The Master Information Block (MIB), which is alsobroadcast over the air interface, gives references and scheduling information toa number of SIBs in a cell, as shown in Figure 7 on page 25.

U 00 00072

Master Information

Block

System Information

Block 2

System Information

Block 1

System Information

Block n

...

Figure 7 Organization of System Information Blocks

SIB scheduling information can also be contained in a separate SchedulingBlock (SB1). The Scheduling Block is always referenced from the MIB. Theconfigurable parameter schedulingBlockEnabled controls whether theScheduling Block is used or not. If the parameter is set to TRUE the SchedulingBlock is sent on the broadcast channel and SIB scheduling information isdivided between the MIB and SB1. If the parameter is set to FALSE theScheduling Block is not sent on the broadcast channel and all SIB schedulinginformation is contained in the MIB. If the Scheduling block is activated ordeactivated (i.e. the value of parameter schedulingBlockEnabled ischanged) an update of system information is initiated.

2571/1553-HSD 101 02/6 Uen B 2008-03-14


The MIB is transmitted according to standardized scheduling parameters. AUE is always able to find the MIB on the BCCH and to get the schedulinginformation for the other SIBs. The MIB is sent regularly on the BCCH. It alsocontains information elements for handling and scheduling SIBs and SBs, suchas the appropriate repetition period and the value tag. The SIBs contain allinformation necessary for UEs to work properly in both Idle and Connectedmode. Each SIB contains different kinds of information. Table 3 on page 26contains a description of the information that is carried by the MIB and the SIBs.

Table 3 Contents of System Information Messages

System InformationBlocks

Contents

MIB PLMN identity for serving cell, SIB SchedulingInformation

SB1 SIB Scheduling Information

SIB1 Paging parameters, Timers and counters in Idle andConnected mode, LA and RA updating

SIB2 URA identity list

SIB3 Cell selection and reselection parameters

SIB5 and SIB5bis Paging parameters, Cell and common channelconfiguration

SIB7 Power control on common channel

SIB11 Measurement management, Cell selection andreselection parameters

SIB12 Measurement management

SIB18 PLMN identity for GSM neighbors listed in SIB11.

The BCCH is mapped to the BCH. The RBS continuously transmits the SIBsin system information messages on the BCH, in accordance with schedulingparameters received from the RNC.

In case there are no URAs associated to the cell, SIB2 is not broadcast.

Broadcast of SIB18 is introduced with the optional feature “SIB18, EnhancedInter PLMN Mobility”. This is a license controlled feature, and a software key isnecessary for activation. For more information see Handling of License Control.

The parameter sib5bisEnabled controls whether SIB5 or SIB5bis isbroadcasted on BCH, see Multiband operation for more details.

3.7.2 System Information Update

A system information update can be triggered by, for example, measurementreports that affect the value of a broadcast system parameter. In addition,

26 71/1553-HSD 101 02/6 Uen B 2008-03-14


reconfiguration of system parameters, change of repetition rate for a SIB, andchange of start position will trigger an update procedure.

When the system information is modified, the RNC sends the modified SIBsto the RBS. Subsequently, the RBS broadcasts these SIBs on the BCH. Inorder to reduce power consumption, the UE does not always read the systeminformation.

System information update may fail and the RNC may attempt a new systeminformation update request to the RBS for the cell. The RNC repeats theprocedure until there is a positive response or until the maximum number ofreattempts has been reached. The maximum number of update reattemptsdepends on the configuration of the parameter updateCellReattsNo. If themaximum number of reattempts is reached, the cell is blocked.

SIBs are sent regularly on the BCH, and each SIB has its own repetition period,see Section 3.7.3 on page 30 for more details in Scheduling Information ofthese SIBs. The MIB has a fixed, predefined repetition rate equal to 80 ms,corresponding to an 8–SFN period. The MIB contains the PLMN identity tobe used during the PLMN selection.

Different rules are applied for rereading of different SIB types, depending onwhether they contain static or dynamic information elements.

For SIBs containing static parameters, the MIB contains a value tag as part ofthe scheduling information. When any of the information elements in systeminformation is modified, the WCDMA RAN changes the value tag in the MIBthat is related to the SIB containing the modified information element.

If an information element changes in a SIB, the WCDMA RAN alerts all UEsin Idle mode and state URA_PCH in the cell to read system information bysending a “Paging type 1” message containing the information element “BCCHmodification info”. The “BCCH modification info” information element containsthe value tag for the MIB; by reading this information element, a UE knowswhether it has to read the updated MIB.

If the UE is in state CELL_FACH, it receives a System Information ChangeIndication message containing the information element “BCCH modificationinfo” information element.

The MIB value tag is not sent regularly on the FACH; its presence indicateschanges in the system information on the BCH.

The UE reads the updated MIB and compares the new value tag to thelatest value tag for that SIB. If the value tag has changed, the UE reads thecorresponding SIB again. Even if the value tag does not change, the UEconsiders the SIB invalid after a fixed, predefined period after reception andreads the SIB again.

Some SIBs contain information elements that change so often that they needto be read at frequent periods. This type of SIB is not linked to a value tagin the MIB. This is the case of SIB7, which uses expiration time as a reread

2771/1553-HSD 101 02/6 Uen B 2008-03-14


mechanism. When the UE has acquired SIB7, a timer is started. When thetimer expires, the information carried in the SIB is considered to be invalid.For SIB7, the expiration time is the value of the sib7RepPeriod parametermultiplied by the value of the sib7expirationTimeFactor parameter.

The UE reads the system information on the BCCH when the following eventsoccur:

• The UE is powered up.

• The UE changes cell in Idle mode, state CELL_FACH or state URA_PCH.

• The UE is informed of a change of System Information, when in Idle mode,state CELL_FACH or state URA_PCH.

• The UE moves from dedicated mode to common mode.

• The UE moves from dedicated mode to Idle mode.

• The UE is in state CELL_FACH and the timer expires for SIBs withan expiration timer as reread mechanism (UEs in Idle mode and stateURA_PCH may postpone reading the SIB until the content is needed).

The Area Scope column in Table 4 on page 28 specifies the area in which aSIB is valid.

Table 4 SIB Characteristics

System Information Block

Area Scope UE Mode whenthe Block is Read

Modificationof SystemInformation

MIB cell Idle mode

CELL_FACH

URA_PCH

Value Tag

SB1 cell Idle mode

CELL_FACH

URA_PCH

Value Tag

SIB1 PLMN Idle Mode

CELL_FACH

URA_PCH

Value Tag

SIB2 cell URA_PCH Value Tag

SIB3 cell Idle Mode

CELL_FACH

URA_PCH

Value Tag

28 71/1553-HSD 101 02/6 Uen B 2008-03-14


System Information Block

Area Scope UE Mode whenthe Block is Read

Modificationof SystemInformation

SIB5 and SIB5bis cell Idle mode

CELL_FACH

URA_PCH

Value Tag

SIB7 cell Idle mode

CELL_FACH

URA_PCH

Expiration time

SIB11 cell Idle mode

CELL_FACH

URA_PCH

Value Tag

SIB12 cell CELL_FACH

URA_PCH

Value Tag

SIB18 cell Idle mode

CELL_FACH

URA_PCH

Value Tag

If the area scope is a cell, the UE reads the SIB every time a new cell is selected.

If the area scope is PLMN, the UE checks the value tag for the SIB when a newcell is selected. If the value tag for the SIB in the new cell is different from thevalue tag for the SIB in the old cell, the UE reads the SIB again. If the valuetags are the same, the UE can use the information read in the old cell.

For SIB1, which has area scope PLMN, the value tag contains two parts, anupdate part and an area part. The update part is incremented internally by theRNC whenever the content of SIB1 is updated. The area part of the SIB1 valuetag is configured using the sib1PLMNScopeValueTag cell parameter.

SIB1 contains LA and RA information valid for the cell. For mobility reasons theUE needs to update this information whenever a LA or RA border is passed.To make this happen the setting of the parameter sib1PLMNScopeValueTagmust be planned to make sure that neighboring LAs and RAs have differentvalues. However, within one LA or RA the same setting can be used in all cells.PLMN scope really means LA or RA scope and the area part of the SIB1 valuetag is associated with LA and RA, not associated with any other type of area.

2971/1553-HSD 101 02/6 Uen B 2008-03-14


3.7.3 Changing of Scheduling Information

Two important parameters used in the creation of a Schedule for SystemInformation are the Repetition Rate for a SIB sibxRepPeriod (where x =1, 2, 3, 5, 7, 11, 12 or 18) and the Start Position for a SIB sibxStartPos(where x = 1, 2, 3, 5, 7, 11, 12 or 18). These parameters are configurable,see Section 5.2 on page 55 for details. Note that the repetition rate and thestart position for SIB5 and SIB5bis are configured using the same parameters(sib5RepPeriod and sib5StartPos).

The default values for the SIB scheduling parameters are carefully chosento allow network expansion, that is, the default values cater for the situationwhere the amount of information to be broadcast increases, without creatinga need to adjust these parameters (for example, new neighboring cellrelationships can be added, without having to adjust the sib11RepPeriodand sib11StartPos). However, there are potential risks in adjusting theseparameters. If adjustments cause a scheduling failure in the RNC, that is,the RNC is not able to create a working schedule based on newly configuredsibxRepPeriod or sibxStartPos, then all cells controlled by that RNC willbe locked and an alarm raise for each cell. For example, extreme care must betaken to ensure that a complete segment from one SIB does not try to occupythe same position as a segment from another SIB.

3.8 Access Restriction

Access restrictions can be applied in a specific cell, cell group or all cells in theRNS in order to prevent users from making access attempts. Access classrestrictions should not be used under normal operating conditions but can beapplied when e.g. new cells are put into service or to avoid signalling or CNoverload during extreme load conditions.

Access class restrictions are broadcast in SIB3 for Access Classes 0 - 15. Anoverview of the different access classes can be found in Reference [5].

3.8.1 Cell Specific Access Restrictions

Cell specific access class restrictions could be defined per UTRAN cellindependent of CN domain for pre rel-6 UE’s using the operator parameteraccessClassNBarred. CS and PS specific access class restrictions aresupported for rel-6 and later UE’s and are controlled by the parametersaccessClassesBarredCs and accessClassesBarredPs.

3.8.2 RNS Wide Access Restrictions

3.8.2.1 Load-triggered Access Class Barring

Load-triggered Access Class Barring is a license controlled feature and asoftware key is necessary for activation. If activated, the feature provides load

30 71/1553-HSD 101 02/6 Uen B 2008-03-14


dependent RNS-wide access class barring of Access Classes [0; 9] whenthe aggregated Iu-signalling connection setup rate exceeds the operatorconfigured threshold iuSccpConRateThresh. The Iu-signalling connectionsetup rate is averaged over an operator configured measurement periodiuSccpConRateMeasPeriod. When the load threshold is exceeded, 8 out of10 access classes are barred in every operational cell in the RNS. Note thatdifferent access classes may be barred in different cells.

The access class restrictions are removed in the following measurementperiods, in step of 2 Access Classes at the time, if the Iu connection setup ratein that period has been reduced below the load threshold (adjusted with aninternal hysteresis margin of 20%).

Note that Load-triggered Access Class Barring does not removecell specific access class restrictions configured by the operatorparameters accessClassNBarred, accessClassesBarredCs andaccessClassesBarredPs.

3171/1553-HSD 101 02/6 Uen B 2008-03-14


32 71/1553-HSD 101 02/6 Uen B 2008-03-14

Engineering Guideline

4 Engineering Guideline

This section gives complementary information about practical engineeringaspects of the radio functionality. It covers issues such as using theoperator-definable radio parameters in different radio network scenarios,describing the reasoning behind the parameter settings, as well as addingexamples of common settings when appropriate.

The engineering guidelines have been preliminary updated for the latestchanges in functionality.

The choice of system for Idle mode camping is important. The multi-RATUE camps on the system where it is expected to set up its services, andwhere it will be paged. In order for the multi-RAT UE to be able to accessWCDMA-specific services, it needs to camp on WCDMA. The recommendedstrategy is, therefore, to camp on WCDMA whenever there is coverage.Outside WCDMA coverage, the UE camps on GSM to get access to standardGSM services. Once a WCDMA cell is selected, the parameter setting tries tokeep the UE in this access technology as long as the quality and the receivedsignal strength are good enough.

Unless stated in this section, all discussions and parameters for Idle mode arealso valid for Connected mode in state CELL_FACH and URA_PCH. Microcells and pico cells have not been considered, but deployment of a secondcarrier is described.

The parameter settings recommended in Section 4 on page 33 enable thecamping strategy described above.

Note that differences in behavior using the same parameter setting withdifferent UE types have been observed. This indicates that when tuning Idlemode parameters, it is important to use the most common UEs in the system inorder to achieve the desired behavior from the tuning.

4.1 Cell Selection

Parameters qQualMin and qRxLevMin set the minimum levels for Idle modecamping. The recommended settings are the following:

• qQualMin= -18 dB• qRxLevMin= -115 dBm

It is recommended to keep these values constant. If there is a need to modifyIdle mode cell size, the cell reselection parameters can be used for that purpose.

The recommended setting for qRxLevMin is the lowest possible value thatcan be used without having a license key for the optional feature Increased

3371/1553-HSD 101 02/6 Uen B 2008-03-14


Downlink Coverage. In order for the UE to be able to read system information,the power levels on BCH must be set correctly, see Power Control.

The setting of qRxLevMin is related to the power level on the PrimaryCPICH (primaryCpichPower), see Power Control. If the value ofprimaryCpichPower is increased, a UE at the cell border might haveproblems to access the system if the cell is loaded. To keep the cell sizeconstant and compensate for the increase of primaryCpichPower, it isrecommended to increase the setting of qRxLevMin accordingly.

The parameter maxTxPowerUl is used to limit the maximum UE transmitpower in a cell. It is also used to give UEs with lower power capability, and thussmaller UL coverage, a matching cell area in Idle mode. The value to configuredepends on what UE type the network is planned for. Since most existingUEs have a power capability of 21 dBm or 24 dBm, it is recommended to setmaxTxPowerUl to24 dBm.

A comparison between cell sizes in Idle mode and Connected mode CELL_DCHstate shows that the cell size is generally larger in Connected mode. Onereason is that soft handover is used, which improves the radio link quality.

The cell selection parameters work in the same way for a combinedWCDMA-GSM network, for example, parameter qRxLevMin is set also forGSM neighbors.

The initial process of PLMN selection decides which PLMN will be initiallychosen. This process depends on UE type, as well as both operator-controllableand user-controllable data stored on the SIM card, such as preferred PLMNand RAT, see Reference [2]. That type of data cannot be managed by WCDMARAN parameters. It is only when the UE has found a suitable cell, of theselected PLMN, that it is solely controlled by the cell reselection parameters, asset by the network in system information.

4.2 Cell Reselection

This section explains the measurements and cell ranking done by UE.

4.2.1 Measurements

The UE measures and evaluates the neighboring cells listed in systeminformation (SIB 11).There are three different types of neighboring cells:• Intra-frequency neighbors• Inter-frequency neighbors• GSM neighbors

4.2.1.1 Measurements on Intra-Frequency Neighbors

The decision on when to start measurements on intra-frequency neighborsfor cell reselection is made using the parameter sIntraSearch. The

34 71/1553-HSD 101 02/6 Uen B 2008-03-14


recommendation not to send this parameter in system information is achievedwith the following setting:• sIntraSearch = 0

When this parameter is not sent, the UEs are configured to performmeasurements on intra-frequency neighbors continuously.

4.2.1.2 Measurements on Inter-Frequency Neighbors

If inter-frequency neighbors are defined in the cell, the parametersInterSearch decides when the UE will start measure them. Therecommendation not to send this parameter in system information is carriedout with the following setting:• sInterSearch = 0

When this parameter is not sent, the UEs are configured to performmeasurements on inter-frequency neighbors continuously. This setting willresult in load balancing among the different frequencies as the UE will alwaysperform cell reselection to the frequency on which the received quality is thebest.

If no inter-frequency neighbors are defined in the cell, the parametersInterSearch can be set to any value, because it will not be used.

4.2.1.3 Measurements on GSM Neighbors

If GSM neighbors are defined in the cell, the parameter sRatSearch andsHcsRat decide when the UE will start to measure them. The parametersRatSearch is used to calculate a CPICH Ec/N0 threshold in relation toqQualMin whereas the parameter sHcsRat gives the corresponding CPICHRSCP threshold in relation to qRxLevMin. The recommended parametervalues for sRatSearch and sHcsRat are 4 dB and 3dB, respectively. Withthis setting a UE in Idle mode or in CELL_FACH will start to measure GSMneighbors when either measured quality or signal strenght in the serving cell isless than or equal to the thresholds given below:

Qqualmeas = qQualMin + sRatSearch = -18 + 4 = -14 dB

OR

Qrxlevmeas = qRxLevMin + sHcsRat + Pcompensation = -112 +Pcompensation dBm

Note that the thresholds are set relatively low to avoid ping-pong behaviorbetween WCDMA and GSM.

Note also that with current default setting of sHcsRat (-105 dB) the CPICHRSCP threshold is not activated and the UE will only trigger start of GSMmeasurements based on the received quality in the serving cell. To activatethe CPICH RSCP threshold the parameter sHcsRat should be set to a value >

3571/1553-HSD 101 02/6 Uen B 2008-03-14


0. All negative values of sHcsRat are interpreted as 0 by the UE accordingto Reference [4].

The use of the parameter sHcsRat in a non-HCS network was introducedlate in 3GPP Rel-5 with CR 130 on TS 25.304. Therefore there will be oldterminals that do not support this parameter. These terminals will behave inthe same way as if the parameter is not activated, that is, they will only basethe start of GSM measurements on the CPICH Ec/N0 threshold set by thesRatSearch parameter.

From field testing it has been observed that the measured CPICH Ec/N0 andCPICH RSCP levels in the cell are not always correlated. For example whenthe UE moves out of WCDMA coverage, the CPICH Ec/N0 level measuredin the UE might still be OK while the received signal level is decreasing.Therefore it is important to be able to start GSM measurements based on bothmeasurement quantities.

Figure 8 on page 36 illustrates when GSM measurements are performed bythe UE based on the CPICH Ec/N0 threshold. A similar graph would also beapplicable for the corresponding CPICH RSCP threshold.

CPICH Ec/No [dB]

-14 dB

qQualMin = -18 dB

sRatSearch=4 dB

t [s]

WC

DM

Am

easurements

WC

DM

Am

easurements

WC

DM

A and G

SM

measurem

ents

U 00 00388

Figure 8 Measurements on GSM Neighbors

If no GSM neighbors are defined, the parameters sRatSearch and sHcsRatcan be set to any value, because they will not be used.

36 71/1553-HSD 101 02/6 Uen B 2008-03-14


4.2.1.4 Inter-Frequency and GSM Measurements in state CELL_FACH

When inter-frequency and/or GSM neighbors are defined in the cell, thefollowing settings are recommended:

• fachMeasOccaCycLenCoeff = 4

This setting should be used when either inter-frequency or GSM neighbors aredefined in the cell. With this setting the UE will leave the FACH channel every16th frame to perform measurements on other frequencies or RATs.

• fachMeasOccaCycLenCoeff = 3

This setting should be used when both inter-frequency and GSM neighbors aredefined in the cell. With this setting the UE will leave the FACH channel every8th frame to perform measurements on other frequencies and RATs.

If inter-frequency neighbors are defined in the cell the parameterinterFreqFddMeasIndicator should be set to TRUE. With this setting theUE will evaluate the cell reselection criteria on inter-frequency cells in stateCELL_FACH.

4.2.2 Cell Ranking

Only measured neighbor cells that fulfill the cell selection criteria are ranked.The parameter qualMeasQuantity defines what ranking quantity is used.The recommended setting is qualMeasQuantity = 2 which correspondsto CPICH Ec/N0.

With this setting the UE first makes a CPICH RSCP ranking. If a GSM cell ishighest ranked, no more ranking is done. If a WCDMA neighbor is highestranked, a second ranking takes place, this time according to CPICH Ec/No, andexcluding all GSM neighbors.

It is possible to control the cell size in Idle mode using the qHyst and qOffsetparameters. The parameter qHyst (presented by qHyst1 and qHyst2) isadded to the measured values of the serving cell. These parameters expandthe cell borders of the serving cell in order to avoid ping-pong effects. Theparameters qOffset1 or qOffset2 add an offset value for a cell-to-cellrelation that are used to move the borders between the cells. A positive valueof the parameter qOffset will make the neighbor decrease in size and anegative value will make the neighbor increase in size.

The UE reselects the cell first on the ranked list when the reselection criteriahave been fulfilled during a time interval of treSelection. The combinationof settings for the parameters treSelection and qHyst below has in testsproven to give stable cell reselection behavior:

• qHyst1 = 4 dB

• qHyst2 = 4 dB

• treSelection = 2 seconds

3771/1553-HSD 101 02/6 Uen B 2008-03-14


The setting for the parameter treSelection is a compromise between a toolow value, triggering too many reselections in the fading radio environment, anda too high value, that slows down the process.

The value for the parameter qOffset1sn is the offset between serving celland target cell based on received signal strength. The parameter Qoffset2snis the offset based on Ec/No.

Note that the parameter qOffset1sn works identically for WCDMA-GSMand WCDMA-WCDMA neighbor relations. But the values of GSM RSSI andWCDMA CPICH RSCP are not of the same nature and, therefore, not directlycomparable. Based on measurements of BLER on broadcast channels for thedifferent radio access technologies, a rule of thumb that can be used for initialparameter settings is the following:

[CPICH RSCP] + 7 dB is comparable to [GSM RSSI]

For example, a measured RSCP on a WCDMA CPICH of –100 dBm would becomparable to a GSM broadcast channel RSSI of –93 dBm.

A parameter setting of a GSM neighbor to qOffset1sn = +7 will thus makethe received signal strength in the WCDMA and the GSM cell comparable. Ifthe value is > 7 dB, the WCDMA cell is prioritized, that is, made larger, seeFigure 9 on page 39.

The recommended default values for the offset parameters are the following:

• qOffset1sn = 0 dB for WCDMA neighbors

• qOffset1sn = 7dB for GSM neighbors

• qOffset2sn = 0 dB

38 71/1553-HSD 101 02/6 Uen B 2008-03-14


qOffset1=+7 dB

SS [dBm]

qRxLevMin = -115 dB

WCDMA cell [CPICH RSCP] + qHyst1

Inter RAT cell reselection ifqOffset1=0 and qHyst1=4

t [s]

GSM cell [RSSI]

U 00 00387

WCDMA cell [CPICH RSCP]

GSM cell [RSSI] - qOffset1

Inter RAT cell reselection ifqOffset1=7 and qHyst1=4

qHyst1=+4 dB

Figure 9 Inter-RAT Cell Reselection from a WCDMA Serving Cell to a GSM Neighbor

The default setting described above attempts to make the WCDMA and theGSM cells comparable in the ranking procedure. With this setting it is importantthat the UE will not start measuring on GSM cells too early, that is, the GSMcells should not be part of the ranking procedure until the quality of the servingWCDMA cell is bad enough. This is achieved with sRatSearch set to 4 dB(see Section 4.2.1.3 on page 35).

4.3 HCS deployment example

As an example of how to configure HCS parameters, a two carrier network isassumed where HS is deployed on one of them, see Figure 10 on page 40.The non-HS carrier is the mainland carrier assumed having the most completecoverage of the two. The feature Hierarchical Cell Structure is used to moveUEs in Idle mode to the non-HS carrier. Hence the expected starting point forthe majority of connection establishments from Idle Mode will be the non-HScarrier. At connection establishment the HS users will follow the HS CellSelection procedure and select a cell on the HS carrier, while non-HS userswill establish their connections on the non-HS carrier. In case of high load in

3971/1553-HSD 101 02/6 Uen B 2008-03-14


the non-HS carrier, Inter Frequency Load Sharing will re-direct also non-HSusers to the HS carrier.

f1

f2 Cell f2A (HS)

FAC

H/U

RA

Cell f2A (HS)

Idle

FAC

H/U

RA

Idle

Cell f1A (Non-HS) Cell f1B (Non-HS)

U0000713

Figure 10 The scenario used to demonstrate HCS: Two carriers with HSDPAdeployed on one

When in state CELL_FACH or URA_PCH, typically reached due to low activityon the packet switched connection, it is desireable to remain on the HS carrierto avoid unnecessary transitions between carriers and keep the HS access timeto a minimum. By setting qOffset2sn to a high value for all inter frequencyneighbor relations of the HS cells, the reselection procedure to the non-HScarrier is practically disabled.

To activate HCS for idle mode, parameter hcsUsage.idleMode is set to TRUEboth in the HS and non-HS carrier cells. The non-HS carrier cells are assignedpriority over the HS carrier cells by configuring hcsSib3Config.hcsPrioto 0 for all HS carrier cells and hcsSib11Config.hcsPrio to 1 for all cellrelations to cells in the non-HS carrier. In the reverse direction the parametersare configured the opposite, i.e. hcsSib3Config.hcsPrio equals 1 fornon-HS carrier cells and hcsSib11Config.hcsPrio equals 0 for cellrelations to HS carrier.

Parameter hcsSib3Config.sSearchHcs can be used to limit the areaof the cell where HCS should be applied. For the part of the cell where thequality is better than (qRxLevMin + hcsSib3Config.sSearchHcs), HCS isapplied and normal cell reselection criterias apply elsewhere. This is useful inthe scenario where a large and smaller cell is co-located and it is preferred toprimarily fill up to the smaller cell with traffic. The area, in which HCS shall beapplied, is then configured to co-incide with the coverage area of the smallercell.

In the scenario described here it is assumed the co-located cells in the twocarrier have similar coverage and by setting hcsSib3Config.sSearchHcsto 0 (or any negative value) HCS will be applied throughout the cell. IfGSM neighbors are defined and used in the target carrier cells the settingof hcsSib3Config.sSearchHcs needs to be alligned with sHcsRat. Toavoid a situation where UEs are redirected to a prioritized cell and immediatelyafter start measuring GSM cells, hcsSib3Config.sSearchHcs should beconfigured with at least the same value as target cell sHcsRat. A few dBs

40 71/1553-HSD 101 02/6 Uen B 2008-03-14


margin could be necessary to really ensure the redirection will not become anIRAT cell reselection via the non-HS carrier.

As mentioned in Section 3.2.4.3 on page 18, must cells that are to bepart of the HCS cell ranking qualify a certain quality threshold Qhcs(hcsSib3Config.qHcs for serving cells and hcsSib11Config.qHcsfor neighbors). Setting a minimum acceptable quality level on qHcsmakes it possible to avoid that cells with insufficient quality are reselectedjust because they have higher priority, hence it is recommended to sethcsSib11Config.qHcs equal or higher than target cell qQualMin. In thepresence of GSM neighbors in the HCS target cell, it must be ensured that HCSis not redirecting UEs to cells with a signal level low enough to trigger GSMmeasurements. This is avoided by setting hcsSib11Config.qHcs equal to ora few dB higher than sRatSearch. For the serving cell on the non-HS carrierit is recommended to use a value of hcsSib3Config.qHcs that is a few dBhigher than qQualMin. If GSM neighbors are defined in the cell, the value ofhcsSib3Config.qHcs can be set a few dB higher than sRatSearch.

There is also a temporary offset that can be used to avoid inter frequencytransitions to occur too easily with ping pong reselection as a possible result.This means the inter frequency target cell need to prove an extra quality offsetin order to qualify for the ranking during a certain penalty time. Both theadditional quality offset and the penalty time are configurable. At the expiry ofthe penalty time the offset does not apply and the qualification level is qHcs.

Table 5 summarizes the setting of the HCS parameters and qOffset2snthat creates good conditions for high performance packet switch data servicesby separating the HS services from R99 in a two carrier scenario. Furtheroptimization is recommended to adapt to specific characteristics in differentnetworks.

Table 5 Setting of HCS parameters for improving HSDPA performance in atwo carrier scenario.

Parameter non-HScarrier

HS carrier

hcsUsage.idleMode TRUE TRUE

hcsUsage.connectedMode FALSE FALSE

hcsSib3Config.hcsPrio 1 0

hcsSib3Config.qHcs > qQualMin ifno GSM, or> sRatSearch if GSMneighborsdefined fromnon-HS carrier

default, i.e allneighbor cellsincluded inHCS ranking

4171/1553-HSD 101 02/6 Uen B 2008-03-14


hcsSib3Config.sSearchHcs default, or≥ sHcsRatif GSMneighborsdefined fromnon-HS carrier

default,correspondsto 0 offset fromqRxLevMin

hcsSib11Config.hcsPrio 0 (for cellrelations to HScarrier)

1 (for cellrelations tonon-HS carrier)

hcsSib11Config.penaltyTime not used not used

hcsSib11Config.qHcs default, i.e allneighbor cellsincluded inHCS ranking

≥ qQualMin ifno GSM, or≥ sRatSearchfor targetcell, if GSMneighborsdefined fromnon-HS carrier

hcsSib11Config.temporaryOffset1 0 [infinity] 0 [infinity]

hcsSib11Config.temporaryOffset2 0 [infinity] 0 [infinity]

qOffset2sn 50 dB (for allcell relationsto HS carriercells)

50 dB (for allcell relations tonon-HS carriercells)

4.4 Deployment of an Additional Carrier

When an additional carrier is deployed cluster-wise or as a co-located hot spotcell there are two different camping strategies that can be implemented. Thecamping can be either equally distributed or biased towards a certain carrier.

The policy of equal camping, not favoring any cell on any carrier, is implementedby setting qOffset2sn = 0 between cells on different carriers.

Biased camping towards any cell on any carrier in any direction is implementedby tuning qOffset2sn. The parameter could be changed to -3 dB in thedirection from the additional carrier cells down to the other carrier cells. Inthe opposite direction, qOffset2sn could be changed to +3 dB. A variant ofbiased camping is off-loading a carrier, that is, using the maximum (+50 dB)and minimum (-50 dB) values for qOffset2sn on the cell relations in orderto steer all UEs to camp on a certain carrier. All the changes of qOffset2snshould be performed while monitoring the performance in the additional carriercells to see that the intended traffic load on each carrier is achieved.

For hot spot- and border cells on the additional carrier a higher qRxLevMin(or qQualMin) value can be applied in order to prevent UEs from setting up

42 71/1553-HSD 101 02/6 Uen B 2008-03-14


connections close to the cell borders, and thereby directly start compressedmode measurements once a successful access is made. A threshold levelslightly higher than the compressed mode start level (see Handover) isrecommended initially, but lower values are also possible. The wanted behavioris that the additional carrier hot-spot cell is only loaded through the underlyingco-located cell, and not the adjacent underlying cells. That is managed byeither tuning qOffset2sn values on neighbor relations or by not definingunderlying adjacent cells as neighbors in the direction from underlying cells tothe additional hot-spot cell.

According to 3GPP the UE is only required to measure on two non-usedfrequencies in addition to the currently used one. In a network with four carriers,it is therefore recommended to only configure inter-frequency cell relations tomaximum two (of the three) non-used frequencies. Idle mode access across allthe three different non-used frequencies can still be achieved by making surethat at least one of the two configured non-used frequencies has inter-frequencyneighbors defined to the third non-used frequency.

Note that the encoded message length of System Information Block type11 (SIB11), carrying all neighbor cell information, will increase when theparameters qOffset2sn and qRxLevMin (or qQualMin) are changed asdescribed above. In order to secure that the cell is not deactivated due to SIBscheduling errors it is recommended to limit the total number of neighborrelations defined in the cell (i.e. sum of Utran and Gsm relations) to 75if qOffset2sn is changed (i.e. the parameter is set to a value <> 0 forinter-frequency cell relations). In hot spot and border cells the total number ofneighbor relations defined in the cell shall not exceed 65 if other setting thandefault is used for parameters qOffset2sn and qRxLevMin (or qQualMin).

4.5 GSM to WCDMA Cell Reselection

It is important to correlate the parameters in WCDMA and GSM to achieve therequired Inter-RAT cell reselection behavior and thus a smooth coexistence.The following sections give a brief overview of GSM to WCDMA reselection.For extensive information on GSM parameters (written in capital letters in thisdocument), ranges, and default values, see Reference [1].

4.5.1 Measurements

When the multi-RAT UE enters an area without WCDMA coverage, it will campon a GSM cell. In the GSM network, the parameter QSI controls when the UEperforms measurements on WCDMA neighboring cells. This parameter is setper cell. The parameter QSI can be set in the four following alternative ways,so that WCDMA neighbors are measured:• Always• Never• When signal strength of the GSM cell is above a certain value• When signal strength of GSM cell is below a certain value

4371/1553-HSD 101 02/6 Uen B 2008-03-14


To enable cell reselection to WCDMA in areas with good GSM coverage, it isnecessary to measure on WCDMA also when GSM coverage is good. Therecommendation is that GSM cells that have WCDMA neighbors should havethe QSI value set to Always.

4.5.2 Cell Ranking

The algorithm for cell reselection from GSM back to WCDMA is controlled withthe parameters FDDQMIN and FDDQOFF. The parameter FDDQMIN defines theminimum quality of a WCDMA cell for cell reselection, measured in CPICHEc/No. This parameter is used to assure a sufficient quality of the candidateWCDMA cell. The parameter FDDQOFF sets an offset, positive or negative,between signal quality of GSM cells and the defined WCDMA neighbors. Thetwo cell reselection criteria are the following:

CPICH Ec/No > FDDQMIN

and

CPICH RSCP > RLA + FDDQOFF

RLA is the received signal level average [dBm] for the serving GSM cell andits strongest GSM neighbors.

For a multi-RAT UE just having entered GSM a ping-pong back to WCDMA isprohibited by a timer. The UE must fulfill the two cell reselection criteria abovefor 5 seconds in order to reselect the WCDMA cell. Furthermore, during aperiod of 15 seconds after the cell reselection to GSM, an additional offset of 5dB will be added to the parameter FDDQOFF.

With the GSM feature Combined Cell Reselection Triggering GSM to WCDMA,the mobile will reselect a suitable WCDMA cell if the following cell reselectioncritera are fulfilled:

CPICH Ec/No > FDDQMIN - FDDQMINOFF

and

CPICH RSCP > FDDRSCPMIN - min((P - 21 dBm), 3 dB)

and

CPICH RSCP > RLA + FDDQOFF

The parameter FDDQMINOFF can be used to make the requirement of signalquality less attractive for mobiles that support the signal strength criterion. P isthe maximum RF output power of the UE in WCDMA.

To achieve the preferred camping behavior, the multi-RAT UE should camp onWCDMA when there is coverage. This means that a negative value must beset for the parameter FDDQOFF if cell reselection is to be possible when GSM

44 71/1553-HSD 101 02/6 Uen B 2008-03-14


coverage is good. A drawback would be that cell reselection to a weak WCDMAcell could be made when GSM coverage is moderate. Such an effect couldbe prevented using a higher setting of the the parameter FDDQMIN. A settingof FDDQMIN>qQualMin + sRatSearch can prevent the UE for making cellreselection to a weak quality WCDMA cell, and furthermore prevent too earlycell reselection measurements on GSM.

Examples of other vital GSM parameters are parameter COEXUMTS, whichdetermines if cell reselection to WCDMA is allowed at all, and the parameterACCMIN, which is the UE minimum received signal level for permission toaccess the system on a control channel.

4.6 Paging

4.6.1 DRX Cycle Length Coefficient in Idle mode

The setting of the DRX cycle length coefficient for paging in Idle mode is atrade off between call setup time and UE battery usage. A longer DRX cyclecan significantly increase the UE standby time but it will also impact the callsetup time for terminating calls. If the DRX cycle length is increased theaverage call setup time is delayed with (DRX_cycle_new - DRX_cycle_old)/2ms. For example, if the DRX cycle length is changed from 640 ms to 1280 msthe terminating call setup time is increased with 320 ms on average. The DRXcycle length coefficient used in Idle mode is configured by the parameterscnDrxCycleLengthCs and cnDrxCycleLengthPs.

4.7 Alternative SIB Scheduling to be applied when domainspecific access restrictions are included in systeminformation

When domain specific access restrictions are included in system information,either by setting the parameters accessClassesBarredCs and/oraccessClassesBarredPs to TRUE for any of the Access Classes 0-15 orby activating the feature Load-triggered Access Class Barring, the encodedmessage length of SIB3 will increase. If the size of SIB3 is too large it mightnot be possible to schedule all SIBs on the broadcast channel using the defaultsetting of the SIB parameters sibStartPos and sibRepPeriod specified inSection 5.2 on page 55.

In order to secure that the cell is not deactivated due to SIB scheduling errorsit is recommended to use an alternative setting of the SIB parameters whendomain specific access restrictions are signalled to the UE in SIB3. Thealternative setting is specified below:

sib1RepPeriod = 32

sib2RepPeriod = 128

4571/1553-HSD 101 02/6 Uen B 2008-03-14


sib3RepPeriod = 32

sib5RepPeriod = 32

sib7RepPeriod = 16

sib11RepPeriod = 128

sib12RepPeriod = 32

sib18RepPeriod = 128

sb1RepPeriod = 128

sib1StartPos = 4

sib2StartPos = 118

sib3StartPos = 14

sib5StartPos = 6

sib7StartPos = 2

sib11StartPos = 20

sib12StartPos = 18

sib18StartPos = 122

sb1StartPos = 126

4.8 Scheduling Block Deployment

When additional System Information Blocks are introduced on the broadcastchannel the amount of SIB scheduling information will increase. In orderto off-load the Master Information block (MIB) it’s possible to enable theusage of a separate Scheduling Block (SB1) by setting the parameterschedulingBlockEnabled to TRUE, see Section 3.7.1 on page 25 for moredetails. If the Scheduling Block is enabled it will contain scheduling informationfor SIB2 (if there are URA’s associated to the cell), SIB12 and SIB18 (if thefeature SIB18 is installed and activated). All other SIB’s are still referencedfrom the MIB.

The recommendation is to enable the Scheduling Block SB1 if at least one ofthe optional system information blocks SIB2 and/or SIB18 are scheduled onthe broadcast channel.

46 71/1553-HSD 101 02/6 Uen B 2008-03-14


4.9 SIB18 Deployment

Broadcast of SIB18 is a license controlled feature and a software key isnecessary for activation. When activated, SIB18 will contain the PLMN id foreach GSM relation listed in SIB11. Based on this information the UE can avoidto measure and evaluate GSM neighbors belonging to not allowed PLMN’s andthereby speed up the cell reselection procedure.

The recommendation is to deploy SIB18 in areas with many GSM neighborsof not applicable networks.

4.10 Load-triggered Access Class Barring

The Iu-signalling connection setup rate recorded by the PDF counterpmIuSccpConRate can be used as a guide to set the value of the parameteriuSccpConRateThresh controlling the threshold for applying Load-triggeredAccess Class Barring, see Section 3.8.2 RNS Wide Access Restrictions onpage 30 for more details. The counter will use the same averaging periodas defined for iuSccpConRateThresh and can be observed also when thefeature Load-triggered Access Class Barring is deactivated.

It is strongly recommended that the Iu-signalling network and core network aredimensioned to handle Iu-signalling load significantly above the normal busyhour load even if the Load-triggered Access Class Barring is applied. Loadtriggered access class barring shall only be used to protect the Iu-signallingnetwork or core network in case of exceptionally high signalling load that couldthreaten the stability of the network. Also, if the Load-triggered Access ClassBarring is used, the iuSccpConRateThresh shall be updated according tochanges (e.g. capacity increase) in the Iu-signalling network and/or the corenetwork.

Every time the Load-triggered Access Class Barring is applied, FM-eventRncFunction_loadTriggeredAccessClassBarring is thrown. TheFM-event is visible in the RNC FM-event log.

If the operator wishes to remove the access class restrictions applied by theLoad-triggered Access Class Barring it can be done by deactivating the featurein the RncFeature = “Load-triggered access class barring” MO.

When Load-triggered Access Class Barring is activated it is recommended touse the alternative setting of the SIB scheduling parameters as specified inSection 4.8 Scheduling Block Deployment on page 46.

4771/1553-HSD 101 02/6 Uen B 2008-03-14


48 71/1553-HSD 101 02/6 Uen B 2008-03-14

Parameters

5 Parameters

This section describes all setable parameters that the operator can configure tocontrol the UE behavior in Idle mode and in state CELL_FACH and URA_PCH.

5.1 Descriptions

5.1.1 Cell Selection and Reselection

accessClassNbarred

Indicates whether or not access restrictions apply forAccess Classes 0 to 15. If access restriction is indicatedfor a certain Access Class, the UEs assigned to thisAccess Class are allowed to camp in the cell but are notpermitted to enter Connected mode by sending an RRCConnection Request message.

accessClassesBarredCs[n]

Indicates if CS domain specific access restrictions applyfor Access Classes 0 to 15. If access restriction isindicated for a certain Access Class, the UEs assignedto this Access Class are allowed to camp in the cell butare not permitted to enter Connected mode by sendingan RRC Connection Request message with purpose tosetup a CS Signalling Connection. A connected modeUE shall also check this parameter before sending anINITIAL DIRECT TRANSFER towards the CS domain.

accessClassesBarredPs[n]

Indicates if PS domain specific access restrictions applyfor Access Classes 0 to 15. If access restriction isindicated for a certain Access Class, the UEs assignedto this Access Class are allowed to camp in the cell butare not permitted to enter Connected mode by sendingan RRC Connection Request message with purpose tosetup a PS Signalling Connection. A connected modeUE shall also check this parameter before sending anINITIAL DIRECT TRANSFER towards the PS domain.

bandIndicator Indicates for which GSM band, DCS 1800 or PCS 1900,the ARFCN for the GSM cell is valid. The parameter isdefined per GSM neighbor.

bcchFrequency BCCH frequency code in the GSM cell. The parameteris defined per GSM neighbor.

cellReserved Indicates whether this cell will be reserved for operatoruse. If it is reserved, only UEs assigned to AccessClasses 11 or 15 can treat the cell as candidate for

4971/1553-HSD 101 02/6 Uen B 2008-03-14


cell selection and cell reselection if the cell belongs tothe home PLMN. For other UEs the cell is barred. Theparameter is defined per cell.

fachMeasOccaCycLenCoeff

Used by the UE to calculate the FACH measurementoccasions (see Page 15). The parameter is definedper cell.

hcsPrioOffset Priority offset added, if HCS is used, by UE to thenormal HCS priority level of cells on the MBMSpreferred frequency in order to keep/move the UE to thatfrequency. The parameter is set per cell and signalledto the UE on the MBMS control channel MCCH.

hcsSib3Config.hcsPrio

HCS priority level for the serving cell. The value is sentin system information SIB3.

hcsSib3Config.qHcs

Quality threshold level for applying prioritizedhierarchical cell reselection. The parameter is definedper serving cell and the value is sent in systeminformation SIB3. Separate mapping tables are used formeasurement quantity Ec/N0 and RSCP.

hcsSib3Config.sSearchHcs

This threshold is used for measurement rules for cellreselection. When HCS is used, it specifies the limitfor Srxlev in the serving cell below which the UE shallinitiate measurements of all neighboring cells of theserving cell. When HCS is not used, it specifies the limitSrxlev in the serving cell below which the UE ranksinter-frequency neighboring cells of the serving cell.The parameter is sent in system information SIB3.

hcsSib11Config.hcsPrio

HCS priority level for the neighbor cell. The parameteris configurable per inter-frequency cell relation and thevalue is sent in system information SIB11.

hcsSib11Config.penaltyTime

Specifies the time duration for which the Temporaryoffset(n) is applied for a neighbor cell. The parameteris configurable per inter-frequency cell relation and thevalue is sent in system information SIB11.

hcsSib11Config.qHcs

Specifies the quality threshold level for applyingprioritized hierarchical cell reselection. The parameteris defined per inter-frequency cell relation and the valueis sent in system information SIB11. Separate mappingtables are used for measurement quantity Ec/N0 andRSCP.

hcsSib11Config.temporaryOffset1

Specifies the temporary offset applied to the H andR criteria when HCS is used. The parameter is usedfor GSM cells and for WCDMA cells when the qualitymeasure for cell reselection is set to RSCP. The

50 71/1553-HSD 101 02/6 Uen B 2008-03-14

Parameters

parameter is configurable per inter-frequency cellrelation and the value is sent in system informationSIB11.


Specifies the temporary offset applied to the H andR criteria when HCS is used. The parameter isused for WCDMA cells when the quality measure forcell reselection is set to Ec/N0. The parameter isconfigurable per inter-frequency cell relation and thevalue is sent in system information SIB11.

hcsUsage.connectedMode

Controls whether HCS shall be used in statesCELL_FACH and URA_PCH. The parameter isconfigurable per cell and the value is sent in systeminformation SIB12.

Note: In order for the UE to apply HCS rules inconnected mode the corresponding parameter for idlemode (hcsUsage.idleMode ) must also be set toTRUE.

hcsUsage.idleMode

Controls whether HCS shall be used in Idle mode. Theparameter is configurable per cell and the value is sentin system information SIB11.

interFreqFddMeasIndicator

Indicates if the UE is required to perform measurementsand evaluate the cell reselection criteria forInterfrequency neighbors in state CELL_FACH. Theparameter is defined per cell.

maxTxPowerUl UE maximum transmission power on the RACH whenaccessing the system. The parameter is also used tocalculate the cell selection criteria Srxlev. It is definedper serving cell and per WCDMA neighbor and GSMneighbor.

mcc Mobile Country Code part of the PLMN identity usedin the radio network.

mnc Mobile Network Code of the PLMN identity used in theradio network.

nmo Network operation mode that indicates whether the Gsinterface between the SGSN and MSC/VLR is installed.The parameter is defined per Routing Area.

primaryScramblingCode

Primary downlink scrambling code to be used in the cell.

qHyst1 Hysteresis value of the serving cell to be used for cellranking based on CPICH RSCP.

5171/1553-HSD 101 02/6 Uen B 2008-03-14


qHyst2 Hysteresis value of the serving cell to be used for cellranking based on CPICH Ec/No.

qOffset1sn Signal strength offset between source and target cell tobe used for cell ranking based on CPICH RSCP. Theparameter is defined per WCDMA neighbor relation andper GSM neighbor relation.

qOffset2sn Signal strength offset between source and target cell tobe used for cell ranking based on CPICH Ec/No. Theparameter is defined per WCDMA neighbor relation.

qQualMin Minimum required quality level in the cell measured inthe UE. The parameter is defined per serving cell andper WCDMA neighbor.

qRxLevMin Minimum signal strength level received in the UE. Theparameter is defined per serving cell and per WCDMAneighbor and GSM neighbor.

qualityOffset An additional offset applied to cells belonging to theMBMS Preferred Layer. The parameter is definedper cell and signalled to the UE on the MBMS controlchannel MCCH.

qualMeasQuantity Quality measure (CPICH RSCP or CPICH Ec/No) usedin UE functions for cell selection and reselection in Idleand Connected modes. The parameter is defined percell.

sHcsRat Decision on when measurements on GSM neighborsare performed which is made using this parameter inrelation with Srxlev. The parameter is defined per cell.

sInterSearch Decision on when measurements on Interfrequencyneighbors are performed. The parameter is definedper cell.

sIntraSearch Decision on when measurements on Intrafrequencyneighbors are performed. The parameter is definedper cell.

sRatSearch Decision on when measurements on GSM neighborsare performed which is made using this parameter inrelation with Squal. The parameter is defined per cell.

treSelection Reselection time control of cell selection andreselection. The time-to-trigger for cell reselectionoccurs in seconds. The parameter is defined per cell.

uarfcnDl Downlink UTRAN Absolute Radio Frequency Channelnumber. Specifies the channel number for the central

52 71/1553-HSD 101 02/6 Uen B 2008-03-14

Parameters

DL frequency. The mapping from channel number tophysical frequency is described in 3GPP specificationTS 25.104.

uarfcnUl Uplink UTRAN Absolute Radio Frequency Channelnumber. Specifies the channel number for the centralUL frequency. The mapping from channel number tophysical frequency is described in 3GPP specificationTS 25.104.

5.1.2 Location and Routing Area Updating

att Parameter that facilitates the avoidance of unnecessarypaging attempts. The parameter is sent on BCCH andinforms the UE if IMSI attach and detach is applied. It isdefined per Location Area.

lAC LA Code that identifies a Location Area.

rAC RA Code that identifies a Routing area.

t3212 Periodic Update Timer for LA update. The parameter isdefined per Location Area.

5.1.3 URA Handling

uraIdentity The parameter identifies a UTRAN Registration Area(URA) in the network.

5.1.4 Paging

cnDrxCycleLengthCs

CN DRX cycle length coefficient (k) for UEs in Idlemode, circuit-switched. The parameter is defined perRNC.

cnDrxCycleLengthPs

CN DRX cycle length coefficient (k) for UEs in Idlemode, packet-switched. The parameter is defined perRNC.

utranDrxCycleLength

DRX cycle length coefficient (k) for paging of Connectedmode UEs in state URA_PCH, applicable for bothUTRAN and CN initiated paging. The parameter isdefined per RNC.

noOfMaxDrxCycles Paging notification duration. For notifying UEs in Idlemode about a system information update, the RNCsends a paging message on the PCH at every pageoccasion of a number of maximum DRX cycles. Theparameter is defined per RNC.

5371/1553-HSD 101 02/6 Uen B 2008-03-14


noOfPagingRecordTransm

Number of preconfigured subsequent transmissions ofthe same paging record. The parameter is defined perRNC.

5.1.5 System Information

noOfMibValueTagRetrans

Number of MIB value tag retransmissions on the FACH.The parameter is defined per RNC.

sb1RepPeriod Repetition period for Scheduling Block 1. The parameteris defined per RNC.

sb1StartPos Start position of Scheduling Block 1. The parameteris defined per RNC.

schedulingBlockEnabled

Controls whether the Scheduling Block (SB1) is beingbroadcasted or not.

sib1PLMNScope-ValueTag

Area part of PLMN scope value tags for SIB1. Theparameter is defined per cell.

sib1RepPeriod Repetition period for SIB Type 1. The parameter isdefined per RNC.



sib5RepPeriod Repetition period for SIB Type 5 and SIB Type 5bis.The parameter is defined per RNC.





sib1StartPos Start position of SIB Type 1. The parameter is definedper RNC.


54 71/1553-HSD 101 02/6 Uen B 2008-03-14

Parameters


sib5StartPos Start position of SIB Type 5 and SIB Type 5bis. Theparameter is defined per RNC.





sib7expirationTimeFactor

SIB7 use expiration time as reread mechanism. Theexpiration time is parameter sib7RepPeriod timesthe sib7expirationTimeFactor. The parameteris defined per RNC.

updateCellReattsNo

Number of update reattempts when an update of systeminformation parameters in a cell failed. The parameteris defined per RNC.

5.1.6 Load-triggered Access Class Barring

iuSccpConRateMeasPeriod

Averaging period for Iu-signalling connection setup ratemeasurement used for Load-triggered Access ClassBarring and PDF counter pmIuSccpConRate.

iuSccpConRateThresh

Connection setup rate threshold for Load-triggeredAccess Class Barring. Iu-signalling connection setuprate is averaged over period of iuSccpConRateMeasPeriod. If the average exceeds this threshold, theLoad-triggered Access Class Barring is triggered and80% of the Access Classes in range [0; 9] are randomlybarred in the entire RNS. The access restrictions areremoved in the following measurement periods, instep of 2 Access Classes at the time, if the connectionsetup rate in that period has been reduced below thisthreshold (adjusted by an internal hysteresis margin of20%).

5.2 Values and Ranges

Table 6 on page 56 specifies the parameters described in this document.

5571/1553-HSD 101 02/6 Uen B 2008-03-14


Table 6 WCDMA RAN Idle Mode Parameters

Parameter Name DefaultValue

Value Range Resolution

Unit

Cell Selection and Reselection

FALSE FALSE; TRUE - -accessClassNBarred[n]

[No accessrestrictionsapply forAccess

Classes 0 to15 (n= 0..15)]

[Each boolean in thevector representsone Access Class:

FALSE = No accessrestrictions apply forthis Access Class;TRUE = access

restrictions apply forthis Access Class]

[-] [-]

accessClassesBarredCs[n] FALSE

[No CSdomainspecific

access restriction applyfor Access

Classes 0 to15 (n= 0..15)]

FALSE; TRUE

[Each boolean in thevector representsone Access Class:FALSE = No CSdomain specific

access restrictionsapply for this AccessClass; TRUE = CS

domain specificaccess restrictions

apply for this AccessClass]

-

[-]

-

[-]

accessClassesBarredPs[n] FALSE

[No PSdomainspecific

access restriction applyfor Access

Classes 0 to15 (n= 0..15)]

FALSE; TRUE

[Each boolean in thevector representsone Access Class:FALSE = No PSdomain specific

access restrictionsapply for this AccessClass; TRUE = PS

domain specificaccess restrictions

apply for this AccessClass]

-

[-]

-

[-]

bandIndicator DCS 1800 DCS 1800;PCS 1900;

OTHER_BANDS

- -

bcchFrequency - 0..1023 1 -

56 71/1553-HSD 101 02/6 Uen B 2008-03-14

Parameters




Unit

cellReserved NOT_RESERVED

RESERVED;NOT_RESERVED

- -

0 0..12 1 -fachMeasOccaCycLenCoeff

[0] [0: not broadcastedin SIB 11 (UE is

not allowed to leaveSCCPCH to performmeasurements onother frequencies

or RATs)

1: not used

2: not used

3: used wheninter-frequency andGSM neighbors areconfigured in the cell

4: used wheninter-frequency or

GSM neighbors areconfigured in the cell

5-12: not used]

[-] [-]

hcsSib3Config.hcsPrio 0 0..7 1 -

0 0..99 1 -

[CPICHEc/N0

mapping:-24]

[CPICH Ec/N0mapping: 0..48= -24..0; 49..99

= spare]

[0.5] [dB]

hcsSib3Config.qHcs

[CPICHRSCP

mapping:-115]

[CPICH RSCPmapping: 0..89 =-115..-26; 89..99

= spare]

[1] [dB]

hcsSib3Config.sSearchHcs -105 -105 .. 91 2 dB

hcsSib11Config.hcsPrio 0 0..7 1 -

hcsSib11Config.penaltyTime 0

[not used]

0..60

[not used, 10, 20,30, 40, 50, 60]

10

[-]

-

[s]

5771/1553-HSD 101 02/6 Uen B 2008-03-14





Unit

0 0..99 1 -

[CPICHEc/N0

mapping:-24]

[CPICH Ec/N0mapping: 0..48= -24..0; 49..99

= spare]

[0.5] [dB]

hcsSib11Config.qHcs

[CPICHRSCP

mapping:-115]

[CPICH RSCPmapping: 0..89 =-115..-26; 89..99

= spare]

[1] [dB]


[infinity]

0..21

[infinity; 3; 6; 9; 6;12; 15; 18; 21]

3

[-]

dB

[dB]


[infinity]

0; 2; 3; 4; 6; 8; 10; 12

[infinity; 2; 3; 4; 6;8; 10; 12]

-

[-]

dB

[dB]

hcsUsage.connectedMode FALSE FALSE; TRUE

Note 2

- -

hcsUsage.idleMode FALSE FALSE; TRUE - -

hcsPrioOffset 7 0..7 1 -

interFreqFddMeasIndicator FALSE FALSE; TRUE - -

maxTxPowerUl (serving cell, WCDMA neighbor within same RNC)24 -50..+33 1 dBm

maxTxPowerUl (WCDMA neighbor belonging to another RNC)100 -50..+33; 100 (100:The parameter is notsent in SIB11 and theUE will use the same

value as specifiedfor maxTxPowerUl

in serving cell)

1 dBm

maxTxPowerUl (GSM neighbor) 100 -50..+33; 100 (100:The parameter isnot sent in SIB11

and the UE will usethe maximum outputpower for this GSMcell, according toits radio access

capability)

1 dBm

mcc 1 0..999 1 -

58 71/1553-HSD 101 02/6 Uen B 2008-03-14

Parameters




Unit

mnc 1 0..999 1 -

nmo MODE_II MODE_I; MODE_II - -

primaryScramblingCode - 0..511 1 -

qHyst1 4 0..40 2 dB

qHyst2 4 0..40 2 dB

qOffset1sn (WCDMA neighbor relation)0 -50..50 1 dB

qOffset1sn (GSM neighbor relation)7 -50..50 1 dB

qOffset2sn (WCDMA neighbor relation)0 -50..50 1 dB

qQualMin (serving cell, WCDMA neighbor within same RNC)-18 -24..0 1 dB

qQualMin (WCDMA neighbor belonging to another RNC)100 -24..0; 100 (100: Theparameter is not sentin SIB11 and the UE

will use the samevalue as specifiedfor qQualMin in

serving cell)

1 dB

qRxLevMin (serving cell, WCDMA neighbor belonging to same RNC)-115 -119..-25

Note 1

2 dBm

qRxLevMin (WCDMA neighbor belonging to another RNC)100 -119..-25; 100 (100:The parameter is notsent in SIB11 and theUE will use the same

value as specifiedfor qRxLevMin in

serving cell)

Note 1

2 dBm

qRxLevMin (GSM neighbor) 100 -115..-25; 100 (100:The parameter is not

sent in SIB11 andthe UE will use same

value as specifiedfor qRxlevMin in

serving cell)

2 dBm

-1 - 1; 4; 8; 12; 16;20; 30; 40

- dBqualityOffset

[infinity] [infinity; 4; 8; 12;16; 20; 30; 40]

[-] [dB]

5971/1553-HSD 101 02/6 Uen B 2008-03-14





Unit

qualMeasQuantity CPICH_EC_N0

CPICH_RSCP;CPICH_EC_N0

- -

sHcsRat - 105 -105..91 (A negativevalue is interpreted

as 0 by the UE)

2 dB

0 0; 1..27 1 2 dBsInterSearch

[0] [not sent; -32..20] [2] [dB]

0 0; 1..27 1 2 dBsIntraSearch

[0] [not sent; -32..20] [2] [dB]

sRatSearch 4 -32..20 (A negativevalue is interpreted

as 0 by the UE)

2 dB

treSelection 2 0..31 1 s

uarfcnDl - 0..16383 - -

uarfcnUl - 0..16383 - -

Location and Routing Area Updating

att TRUE FALSE; TRUE - -

lAC - 1..65533; 65535 1 -

rAC - 0..255 1 -

10 0; 1..255 1 6 mint3212

[60] [infinite; 6..1530] [6] [min]

URA Handling

uraIdentity - 0..65535 1 -

Paging

6 6..9 1 10(2^k)ms

cnDrxCycleLengthCs

[640] [640; 1280; 2560;5120]

[-] [ms]

7 6..9 1 10(2^k)ms

cnDrxCycleLengthPs

[1280] [640; 1280; 2560;5120]

[-] [ms]

60 71/1553-HSD 101 02/6 Uen B 2008-03-14

Parameters




Unit

utranDrxCycleLength 5

[320]

3..9

[80; 160; 320; 640;1280; 2560; 5120]

1

[-]

10(2^k)ms

[ms]

noOfMaxDrxCycles 1 1..10 1 -

noOfPagingRecordTransm 2 1..5 1 -

System Information

noOfMibValueTagRetrans 0 0..10 1 -

sb1RepPeriod 128 4, 8, 16, 32, ..., 4096 - SFN

sb1StartPos 126 0..4094 2 SFN

schedulingBlockEnabled FALSE FALSE; TRUE - -

sib1PlmnScopeValueTag - 0..31 1 -

sib1RepPeriod 32 4, 8, 16, 32, ..., 4096 - SFN








sib1StartPos 4 0..4094 2 SFN








sib7ExpirationTimeFactor 1 1, 2, 4, 8, ..., 256 - times

updateCellReattsNo 5 0..10 1 -

Load-triggered Access Class Barring

6171/1553-HSD 101 02/6 Uen B 2008-03-14





Unit

iuSccpConRateMeasPeriod 120 10..120 10 s

iuSccpConRateThresh 10000 10..10000 10 connections/s

Note 1: Support for values below -115 dB is introduced with the optional featureIncreased Downlink Coverage. This is a license controlled feature, and asoftware key is necessary for activation. For more information see Handling ofLicense Control.

Note 2: In order for the UE to apply HCS rules in connected mode thecorresponding parameter for idle mode (hcsUsage.idleMode ) must alsobe set to TRUE.

Recommended setting of the parameters listed in the table above can be foundin Radio Network Parameters, 86/1553 - HSD 101 02/6.

62 71/1553-HSD 101 02/6 Uen B 2008-03-14

Reference List

Reference List

[1] GSM-UMTS Cell Reselection and Handover, User Description,208/1553-HSC 103 12/11

[2] Technical Specification, NAS Functions related to Mobile Station (MS) inidle mode, 3GPP TS 23.122

[3] UE Procedures in Idle Mode and Procedures for Cell Reselection inConnected Mode, 3GPP TS 25.304

[4] Radio Resource Control (RRC) Protocol Specification, 3GPP TS 25.331

[5] Service Accessibility, 3GPP TS 22.011

6371/1553-HSD 101 02/6 Uen B 2008-03-14

Date post:	06-Mar-2016
Category:	Documents
Upload:	raghunandan-phanibhatla
View:	214 times
Download:	0 times

Idle mode

Documents