ue behaviors in idle-mode description_2008-07-30__irm.pdf

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RAN

UE Behaviors in Idle Mode Description

Issue 02

Date 2008-07-30


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Huawei Proprietary and ConfidentialCopyright Huawei Technologies Co., Ltd

Huawei Technologies Co., Ltd. provides customers with comprehensive technical support and service. For

any assistance, please contact our local office or company headquarters.

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

Bantian, Longgang

Shenzhen 518129

People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

Copyright Huawei Technologies Co., Ltd. 2008. All rights reserved.

No part of this document may be reproduced or transmitted in any form or by any means without prior

written consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions

and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.

All other trademarks and trade names mentioned in this document are the property of their respective

holders.

Notice

The information in this document is subject to change without notice. Every effort has been made in the

preparation of this document to ensure accuracy of the contents, but all statements, information, and

recommendations in this document do not constitute the warranty of any kind, express or implied.


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RANUE Behaviors in Idle Mode Description Contents

Issue 02 (2008-07-30) Huawei Proprietary and ConfidentialCopyright Huawei Technologies Co., Ltd

i

Contents

1 Change History......................................................................................................................1-2

2 UE Behaviors in Idle Mode Introduction...........................................................................2-2

3 UE Behaviors in Idle Mode Principles ...............................................................................3-2

3.1 PLMN Selection............................................................................................................................................3-2

3.1.1 Automatic PLMN Selection .................................................................................................................3-2

3.1.2 Manual PLMN Selection .....................................................................................................................3-23.2 Cell Selection ................................................................................................................................................3-2

3.2.1 Cell Selection Procedure......................................................................................................................3-2

3.2.2 Cell Selection Criteria..........................................................................................................................3-2

3.3 Cell Reselection ............................................................................................................................................3-2

3.3.1 Cell Reselection Process ............ .............. .............. ............. ............ .............. ............. .............. ............ 3-2

3.3.2 Measurement Start Criteria .............. ............. ............. ............. .............. ............. ............ .............. ........ 3-2

3.3.3 Cell Reselection Criteria ............ .............. .............. ............. ............ .............. ............. .............. ............ 3-2

3.4 Location Registration....................................................................................................................................3-2

3.4.1 Classification of Location Registration................................................................................................3-2

3.4.2 Normal Location Registration..............................................................................................................3-23.4.3 Periodic Location Registration.............................................................................................................3-2

3.4.4 IMSI Attach/Detach .............................................................................................................................3-2

3.5 Paging Reception ..........................................................................................................................................3-2

3.5.1 Reception Process ................................................................................................................................3-2

3.5.2 Reception Technology..........................................................................................................................3-2

3.6 Broadcast Information Reception..................................................................................................................3-2

3.6.1 System Information Reception.............................................................................................................3-2

3.6.2 Cell Broadcast Service Reception........................................................................................................3-2

3.6.3 MBMS Reception ................................................................................................................................3-2

4 UE Behaviors in Idle Mode Parameters .............................................................................4-2

5 Reference Documents...........................................................................................................5-2


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1-1

1 Change HistoryUE behaviors in idle mode Change History provides information on the changes betweendifferent document versions.

Document and Product Versions

Table 1-1Document and product versions

Document Version RAN Version RNC Version NodeB Version

02 (2008-07-30) 10.0 V200R010C01B061 V100R010C01B050

V200R010C01B041

01 (2008-05-30) 10.0 V200R010C01B051 V100R010C01B049

V200R010C01B040

Draft (2008-03-20) 10.0 V200R010C01B050 V100R010C01B045

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

Feature change: refers to the change in the feature UE behaviors in idle mode of aspecific product version.

Editorial change: refers to the change in the information that was inappropriatelydescribed or the addition of the information that was not described in the earlier version.

02 (2008-07-30)

This is the document for the second commercial release of RAN10.0.

Compared with 01 (2008-05-30) of RAN10.0, issue 02 (2008-07-30) of RAN10.0incorporates the changes described in the following table.

ChangeType

Change Description ParameterChange

Featurechange

More information about PLMN selection is added to section 3.1"PLMN Selection".

None.


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Error! Style not defined.Error! Style not defined.RAN


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

Issue 02 (2008-07-30)

ChangeType


More information about broadcast information reception is addedto section 3.6 "Broadcast Information Reception".

None.

A parameter list is added. See chapter 4 "UE Behaviors in IdleMode Parameters".

None.

Editorialchange

None. None.

01(2008-05-30)

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

Compared with draft (2008-03-20) of RAN10.0, issue 01 (2008-05-30) of RAN10.0incorporates the changes described in the following table.

ChangeType


Featurechange

None. None.

Editorialchange

General documentation change: The UE Behaviors in Idle Mode Parameters is removed

because of the creation of RAN10.0 parameter reference. The structure is optimized.

None.

Draft (2008-03-20)

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

Compared with issue 03 (2008-01-20) of RAN6.1, this issue makes the following changes:

ChangeType


Featurechange

None. None.

The parameter lists are moved to 3.2 UE Behaviors in Idle ModeParameters and the hyperlinks are made to the correspondingparameter tables.

Editorialchange

Implementing information has been moved to a separatedocument.

None.


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2-1

2 UE Behaviors in Idle Mode IntroductionThe UE enters the idle mode immediately after the switch-on. The feature "UE behaviors inidle mode" ensures that the UE is ready to start a service (for example, to make a call or picka call).

The behaviors mainly include: PLMN selection

This procedure ensures that the PLMN selected by the UE provides services properly.

Cell selection and reselection

This procedure ensures that the UE finds a suitable cell to camp on.

Location registration

This procedure is used by the UE to report its status to the network. This procedure ismainly of two types: periodical location registration and the location registration causedby location area change.

In addition, the UE in idle mode takes the following actions:

Paging receptionThe UE detects the paging indicate on the PICH within the predefined time and receivesthe corresponding paging information on the S_CCPCH.

Broadcast information reception

The network broadcasts the network information to the UE that camps on the cell. Uponreception of broadcast information, the UE obtains the network information and takesactions accordingly.

This feature enables the UE to behave as follows:

Receive system information from the PLMN

Get ready to establish the RRC connection

Get ready to respond to paging messages Receive cell broadcast services

Report the UE status to the network periodically or be triggered by events

Impact

Impact on System Performance

This feature has impacts on the following aspects:


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The network parameter affects the success rate of service access and paging.

The network parameter affects the power consumption of the UE in idle mode.

The capability of the UE affects the quality of received signals.

The load of the network affects the UE's access to a cell. When the load is heavy, theUE may fail to access the cell.

Impact on Other Features

None.

Network Elements Involved

Table 2-1 describes the NEs involved in the feature UE behaviors in idle mode.

Table 2-1NEs involved in the feature UE behaviors in idle mode

UE NodeB RNC MSCServer

MGW SGSN GGSN HLR

: not involved

: involved

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


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3-1

3 UE Behaviors in Idle Mode PrinciplesThe following lists the contents of this chapter.

PLMN Selection

Cell Selection

Cell Reselection

Location Registration

Paging Reception

3.1 PLMN Selection

When the UE is switched on, or the coverage is restored, or the UE selects a cell that belongsto another PLMN, the UE selects the registered PLMN or its equivalent PLMN. If noregistered PLMN or equivalent PLMN is available, or if registration is impossible because thePLMN is unavailable, or if registration fails, the UE performs one of the following two

procedures, depending on its operating mode: Automatic selection

The UE automatically selects a PLMN according to the priority order.

Manual selection

The UE shows all available PLMNs to the subscriber. The subscriber then selects aPLMN.

3.1.1 Automatic PLMN Selection

In automatic PLMN selection mode, the UE can select a PLMN from the Home PLMNs(HPLMNs) and roam in the Visited PLMN (VPLMN).

The MCC and MNC in the PLMN identity of the HPLMN match the MCC and MNC in the IMSI ofthe UE.

The PLMNs, except the HPLMNs, which the UE camps on, are defined as VPLMNs.

Selecting from the HPLMN

To select a PLMN from the HPLMNs, the UE does as follows:


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The UE maintains a list of allowed and available PLMNs in priority order. When selecting aPLMN, the UE searches for the PLMNs from the highest priority to the lowest.

Roaming in the VPLMN

If a UE stays in a VPLMN, it regularly searches for the HPLMN and higher-priority PLMNsfor better services.

For this purpose, a value of T minutes may be stored in the SIM. Either T is in the range 6minutes to 8 hours in 6-minute steps or T indicates that no periodic attempts shall be made. Ifno value is stored in the SIM, a default value of 60 minutes is used.

When the UE attempts to access the HPLMN or the PLMN with higher priority, the UE mustadhere to the following rules:

After the UE is switched on, a period of at least two minutes and at most T minutes shallelapse before the first attempt is made.

Periodic attempts shall be performed only by the UE in idle mode.

Only the priority levels of equivalent PLMNs of the same country (which serve as thecurrent serving VPLMN) can be compared with the priority level of a selected PLMN.

3.1.2 Manual PLMN Selection

To manually select a PLMN, the UE does as follows:

The UE maintains a list of allowed and available PLMNs in priority order. When selecting aPLMN, the UE indicates the list to the subscriber who will select a PLMN, and then camps onthe selected PLMN.

For more details of the PLMN selection, refer to 3GPP TS 25.304 and 3GPP TS 23.122.

3.2 Cell SelectionWhen the PLMN is selected and the UE is in idle mode, the UE starts to select a cell thatbelongs to the selected PLMN to camp on and to obtain normal services.

3.2.1 Cell Selection Procedure

Figure 3-1 shows the cell selection procedure for the UE in idle mode.


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3-3

Figure 3-1Cell selection procedure for the UE in idle mode

To select a new PLMN, go back to position 1 of the procedure.

Table 3-1 describes the states involved in the cell selection.


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Table 3-1UE states involved in the cell selection

SN State Description

1 Campednormally

The UE obtains normal services.

2 Connectedmode

After RRC connection setup, the UE changes from the idle mode tothe connected mode (CELL_DCH, CELL_FACH, CELL_PCH, orURA_PCH state)

3 Any cellselection

The UE attempts to find an acceptable cell of any PLMN to camp on.

4 Camped onany cell

The UE obtains limited services and selects a cell through cellselection or reselection. In this case, the PLMN identity is notconsidered.

Figure 3-1 also shows the following items:

Initial cell selection

If no cell information is stored for the PLMN, the UE starts the initial cell selection. Forthis procedure, the UE need not know in advance which Radio Frequency (RF) channelsare UTRA bearers. The UE scans all RF channels in the UTRA band according to itscapabilities to find a suitable cell of the selected PLMN. On each carrier, the UE needonly search for the strongest cell. Once a suitable cell is found, this cell shall be selected.

Stored information cell selection

For this procedure, the UE need know the central frequency information and otheroptional cell parameters that are obtained from the measurement control informationreceived before, such as scrambling codes.

After this procedure is started, the UE selects a suitable cell if any. Otherwise, the initial

cell selection procedure is triggered. Suitable cell

A suitable cell is the cell that the UE may camp on to obtain normal services.

Cell selection of the UE leaving connected mode

When returning to the idle mode from the connected mode, the UE shall select a suitablecell to camp on. Candidate cells for this selection are the cells used immediately beforethe UE leaves the connected mode.

When returning to the idle mode after an emergency call on any PLMN, the UE shallselect an acceptable cell to camp on. Candidate cells for this selection are the cells usedimmediately before the UE leaves the connected mode. If no acceptable cell is found, theUE shall continue to search for an acceptable cell of any PLMN in the state "Any cellselection".

Acceptable cellAn acceptable cell is the cell that the UE may camp on to obtain limited services. Forexample, the UE may originate emergency calls.

3.2.2 Cell Selection Criteria

The cell selection criterion S is fulfilled when:

Srxlev > 0 and Squal > 0


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where

Squal = Qqualmeas Qqualmin

Srxlev = Qrxlevmeas - Qrxlevmin - Pcompensation

Parameter Description

Squal Cell selection quality value (dB)

Applicable only to FDD cells

Srxlev Cell selection RX level value (dBm)

Qqualmeas Measured cell quality value

Quality of the received signal indicated in average CPICH Ec/N0 (dB) forFDD cells

Applicable only to FDD cells

Qrxlevmeas Measured cell RX level value

CPICH RSCP of received signal for FDD cells (dBm) and P-CCPCH RSCP

of received signal for TDD cells (dBm)Qqualmin Min quality level

Qrxlevmin Min RX level

Pcompensation Max (UE_TXPWR_MAX_RACH P_MAX, 0) (dB)

where

UE_TXPWR_MAX_RACH:Max allowed UE UL TX power.

P_MAX: maximum RF output power of the UE (dBm)

3.3 Cell Reselection

The signal strength of both serving cell and neighboring cells varies with the movement of aUE and so the UE needs to select the most suitable cell to camp on. This process is called cellreselection. The cell reselection involves three parts: cell reselection process, measurementstart criteria, and cell reselection criteria.

3.3.1 Cell Reselection Process

The cell reselection process is as follows:

Step 1 The UE calculates the cell SX according to the following formulas:

Squal = Qqualmeas - Qqualmin Srxlev = Qrxlevmeas - Qrxlevmin - Pcompensation

For detailed description of the formulas, see 3.2 Cell Selection.

Figure 3-1 in Cell Selection shows the cell reselection of the UEs in idle mode.

Step 2 The UE decides whether to start the intra-frequency or inter-frequency measurementaccording to the measurement start criteria.


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To start the intra-frequency, inter-frequency, or inter-RAT measurement, go to Step 3.

Otherwise, end the cell reselection.

Step 3 The cells are queued according to the measurement results.

Step 4 The UE selects a suitable cell to camp on according to the cell reselection criteria.

3.3.2 Measurement Start Criteria

The Hierarchical Cell Structure (HCS) may affect the measurement start criteria for cellreselection.

HCS Disabled

Figure 3-2 shows the intra-frequency, inter-frequency, and inter-RAT measurement criteria inthe case when the system messages broadcast by the serving cell indicate that the HCS isdisabled.

Figure 3-2Measurement start criteria for cell reselection with HCS disabled

Intra-frequency measurement

If Squal > Sintrasearch, the UE need not start the intra-frequency measurement.

If Squal Sintrasearch, the UE need start the intra-frequency measurement.

If system messages do not contain Sintrasearch, the UE always need start theintra-frequency measurement.

Sintrasearch is set through Intra-freq cell reselection threshold for idle mode on the RNCside.

Inter-frequency measurement

If Squal > Sintersearch, the UE need not start the inter-frequency measurement.

If Squal Sintersearch, the UE need start the inter-frequency measurement.

If system messages do not contain Sintersearch, the UE always need start theinter-frequency measurement.

Sintersearch is set through Inter-freq cell reselection threshold for idle mode on the RNCside.

Inter-RAT measurement

If Squal > SsearchRATm, the UE need not start the inter-RAT measurement.


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If Squal SsearchRATm, the UE need start the inter-RAT measurement.

If system messages do not contain SsearchRATm, the UE always need start the inter-RATmeasurement.

SsearchRATm is set through Inter-RAT cell reselection threshold on the RNC side.

HCS Enabled

When the HCS is enabled, the measurement criteria for the UE in movement are listed inTable 3-2, Table 3-3, Table 3-4, and Table 3-5.

Intra-frequency and inter-frequency measurement criteria for the UE in slow movement

Table 3-2Intra-frequency and inter-frequency measurement criteria for the UE in slowmovement

Condition Result

Srxlev SsearchHCS orSqual Sintersearch

All intra-frequency and inter-frequency cells are measured.

Squal Sintrasearch Intra-frequency and inter-frequency cells are measured withtheir HCS level no lower than that of the current cell.

Squal > Sintrasearch Intra-frequency and inter-frequency cells are measured withtheir HCS level higher than that of the current cell.

Sintrasearch not delivered All intra-frequency cells are measured.

Inter-frequency cells are measured with their HCS levelhigher than that of the current cell.

SsearchHCS or Sintersearchnot delivered

All intra-frequency and inter-frequency cells are measured.

SsearchHCS is set through HCS cell reselection threshold on the RNC side.

The HCS of intra-frequency neighboring cells of a cell is usually consistent with that ofthe cell. If the Squal of the current cell is good enough, that is, Squal > Sintrasearch, the UEonly needs to compare the Squal in these cells with different HCSs.

Intra-frequency and inter-frequency measurement criteria for the UE in fast movement

Table 3-3Intra-frequency and inter-frequency measurement criteria for the UE in fastmovement

Condition Result

Srxlev SsearchHCS or Squal

Sintersearch

All intra-frequency and inter-frequency cells are

measured.SsearchHCS or Sintersearch notdelivered

All intra-frequency and inter-frequency cells aremeasured.

Others such as Srxlev and Squal aregood.

All intra-frequency and inter-frequency cells aremeasured with their HCS level no higher than thatof the current cell.


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Inter-RAT measurement criteria for UE in slow movement

Table 3-4Inter-RAT measurement criteria for the UE in slow movement

Condition Result

Srxlev SHCS,RATm or Squal SSearchRATmInter-RAT cells are measured.

Squal Slimit,SearchRATm Inter-RAT cells are measured when the HCS levelof inter-RAT cells is higher than or equal to thatof the current cell.

Squal > Slimit,SearchRATm The UE need not measure inter-RAT cells.

SHCS,RATm not delivered Inter-RAT cells are measured.

SHCS,RATm is set through HCS inter-rat reselection threshold on the RNC side.

Slimit,SearchRATm is set through HCS search inter-rat limit threshold on the RNC side. Inter-RAT measurement criteria for the UE in fast movement

Table 3-5Inter-RAT measurement criteria for the UE in fast movement

Condition Result

Srxlev SHCS,RATm or Squal SSearchRATm

Inter-RAT cells are measured.

SHCS,RATm or SSearchRATm notdelivered

Inter-RAT cells are measured.

Others such as Srxlev and Squal are

good.

All inter-RAT cells are measured when the HCS

level of inter-RAT cells is lower than or equal tothat of the current cell.

3.3.3 Cell Reselection Criteria

H criteria and R criteria are used for cell reselection.

The quality level threshold criterion H for the HCS is used to determine whether theprioritized ranking based on the hierarchical cell reselection rules shall apply. The criterion isdefined by:

If the system information indicates that the HCS is not used, the quality level thresholdcriterion H does not apply.

The cell-ranking criterion R is defined by:


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3-9

where

TEMP_OFFSETn is used as an offset to the R criteria for the duration of PENALTY_TIMEnafter a timer Tn is started for that neighboring cell.

TEMP_OFFSETn and PENALTY_TIMEn are only applicable when the system informationindicates that the HCS is enabled.

The mapping between the parameters in the previous formulas and the parameters in the LMTare described in Table 3-6.

Table 3-6Mapping between the parameters in formulas and the parameters in the LMT

Parameters in Criteria Parameter ID Parameter Name

Qhcss

Qhcsn

Qhcs Quality threshold for HCSreselection

IdleQhyst1s Hysteresis 1 for idle modeQhysts

IdleQhyst2s Hysteresis 2 for idle mode

TempOffset1 HCS Cell Reselect TempOffset1TEMP_OFFSETnTempOffset2 HCS Cell Reselect TempOffset2

PENALTY_TIMEn TpenaltyHcsReselect

HCS Cell Reselect Penalty Timer

Figure 3-3 shows the cell reselection procedure, which describes the measurement start andcriteria relations. The actual procedure varies with UE implementation.


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Figure 3-3Cell reselection procedure

Firstly, the UE shall select certain cells that fulfill the S criterion to rank in the followingcases:

When HCS is not used (UseOfHcs is set to NOT_USED), the UE shall rank all cells, notconsidering HCS priority levels.

When HCS is used (UseOfHcs is set to USED) and UE is in low mobility, the UE shallrank all cells that have the highest HCSPrio among those cells that fulfill the criterion H

0. When HCS is used and UE is in high mobility and if there are cells with a lower HCS

priority than the serving cell that fulfil the criterion H >= 0, the UE shall rank all cellsthat have the highest HCSPrio among those cells that fulfil the criterion H >=0 and havea lower HCS priority than the serving cell.

When HCS is used and UE is in high mobility and if there are cells that fulfil thecriterion H >= 0 with an HCS priority higher or equal to the HCS priority of the servingcell, the UE shall rank all cells that have the lowest HCSPrio that fulfil the criterion H>= 0 and have an HCS priority higher or equal to the HCS priority of the serving cell.


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3-11

When HCS is used and if no cell fulfills the criterion H 0, the UE shall rank all cells,not considering HCS priority levels.

Secondly, the UE shall rank the cells according to the R criteria, deriving Qmeas,n andQmeas,s and calculating the R values, as described in the cases below.

The offset IdleQoffset1sn is used for Qoffsets,n to calculate Rn. The hysteresis IdleQhyst1sis used for Qhysts to calculate Rs.

If HCS is enabled, TempOffset1 is used for TEMP_OFFSETn to calculate TOn.Otherwise, TEMP_OFFSETn is not used to calculate Rn. The best ranked cell is the cellwith the highest R value.

If a TDD or GSM cell is ranked as the best cell, the UE shall reselect that TDD or GSMcell.

If an FDD cell is ranked as the best cell and the quality measure for cell selection andreselection is set to CPICH RSCP(QualMeas = CPICH_RSCP), the UE shall reselectthat FDD cell.

If an FDD cell is ranked as the best cell and the quality measure for cell selection andreselection is set to CPICH Ec/N0(QualMeas = CPICH_ECNO), the UE shall perform

a second ranking of the FDD cells according to the R criteria specified above.In this case, however, the UE uses the measurement quantity CPICH Ec/N0 for deriving theQmeas,n and Qmeas,s, and then calculating the R values of the FDD cells. The offsetIdleQoffset2sn is used for Qoffsets,n to calculate Rn, and the hysteresis IdleQhyst2s is usedfor Qhysts to calculate Rs.

If the system information indicates that the HCS is enabled, TempOffset2 is used to calculateTOn. Otherwise, TEMP_OFFSETn is not used to calculate Rn. Following the second ranking,the UE shall reselect the best ranked FDD cell.

In all the previous cases, the UE can reselect a new cell only when the following conditionsare met:

The new cell is better ranked than the serving cell during a time interval Treselections .

More than one second has elapsed since the UE camped on the current serving cell.

For details of the cell reselection criteria, refer to 3GPP TS 25.304.

3.4 Location Registration

Location registration is used for the PLMN to trace the current status of the UE. Locationregistration ensures that the UE is connected to the network when the UE does not performany operation for a long period.

3.4.1 Classification of Location Registration

Location registration refers to the location update for non-GPRS and the route update forGPRS. Location registration is of the following three types:

Normal location registration

Periodic location registration

IMSI attach/detach


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For the procedure of location registration, refer toLocation Update Procedure.

3.4.2 Normal Location Registration

The UE performs normal location registration in the following conditions:

After the switch-on, the UE selects a suitable cell that belongs to a new LA or RA. Thatis, the LA or RA is different from that recorded in the USIM before the switch-off of theUE.

The UE in idle mode enters the cell of a new LA or RA.

3.4.3 Periodic Location Registration

Periodic location registration may be used to periodically notify the network of theavailability of the UE.

It is controlled by a Periodic Location Update timer (T3212, for non-GPRS operation) or aPeriodic Routing Area Update timer (T3312, for GPRS operation). The value of T3212 is sent

by the network to the UE in SIB 1. The value of T3312 is sent by the network to the UE in themessages ATTACH ACCEPT and ROUTING AREA UPDATE ACCEPT. The value of T3312shall be unique within an RA.

T3212 is set through Periodical location update timer on the RNC side. T3312 is set on theCN side.

The timer T3212 is described as follows:

When the UE is switched on or the system information indicates that periodic locationregistration shall be applied, and the timer T3212 is not running. Then, the timer shall beloaded with a random value between 0 and the value of T3212, and shall be started.

When the timer T3212 reaches its expiry value, the UE shall initiate the periodic locationregistration.

The timer T3212 shall be prevented from triggering periodic location update inconnected mode. When the UE returns to the idle mode, T3212 shall be initiated with

respect to the broadcast timeout value and then be started.

If the UE performs a successful combined routing area update, the timer T3212 shall beprevented from triggering the periodic location update until the UE starts location update,for example, because a network operation mode changes or the UE uses non-GPRSservices only.

3.4.4 IMSI Attach/Detach

The IMSI attach/detach process facilitates the fast location registration of the UE in specificconditions.

When the IMSI attach/detach operation applies, the UE shall send the IMSI detach message tothe network when the UE is switched off or the SIM is removed while being in theUPDATED state. This IMSI detach message will not be acknowledged by the network.

The system information will contain an indicator indicating whether the IMSI attach/detachoperation is mandatory in the cell. The UE shall operate in accordance with the received valueof the indicator. This indicator, however, shall not be considered in GRPS attach/detach.


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If the UE still stays in the same LA or RA after being switched on again, the UE shall performan LR request indicating IMSI attach. Otherwise, the UE shall perform an LR requestindicating normal location update.

You can set IMSI attach/detach indicator by set Attach/detach indication.

3.5 Paging Reception

By receiving paging messages, the UE is notified of the service requests made by the CN andthe changes in system information.

3.5.1 Reception Process

When a UE stays in idle mode, the paging to the UE is performed within an LA or RA or thewhole RNC. The UE reads the paging information from the PICH and S-CCPCH. The PICHindicates when the UE reads the paging information from the S-CCPCH, whereas theS-CCPCH carries specific paging messages.

3.5.2 Reception Technology

To reduce power consumption, the UE can read the information from the PICH only at aparticular time. This is known as the Discontinuous Reception (DRX) technology. Theinterval between two consecutive periods of time is called DRX cycle.

For Frequency Division Duplex (FDD), the DRX cycle length shall be 2kframes, where k isan integer and is decided by the following three parameters:

CN domain specific DRX cycle length for CS

CN domain specific DRX cycle length for PS

UTRAN DRX cycle length coefficient

The parameters are described as follows: CN domain specific DRX cycle lengths

The UE may be attached to different CN domains with different CN domain specificDRX cycle lengths. The UE shall store these lengths for all CN domains where the UE isattached and shall use the shortest one.

The value is set through DRX cycle length coefficient on the RNC side.

UTRAN DRX cycle length

This parameter value is sent to the UE through the RRC CONNECTION SETUPmessage without distinguishing specific CN domain types.

For a UE in idle mode, the DRX cycle length equals the shortest value of the stored DRXcycle length for the CN domains where the UE is attached, with no signaling connectionestablished.

For a UE in CELL_PCH state or URA_PCH state, the DRX cycle length equals theshortest value of the following lengths:

UTRAN DRX cycle length

Any of the stored DRX cycle length for the CN domains where the UE is attached,with no signaling connection established


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If you set a big DRX cycle length coefficient, the period for UE detect paging info will be long;therefore, the UE can reduce the power consumption. However, the delay for responding to a paging will

be long.

3.6 Broadcast Information Reception

Upon reception of broadcast information, the UE obtains the network information and takesactions accordingly.

3.6.1 System Information Reception

Structure of System Information

The structure of system information is like a tree, which includes the following items:

MIB

Master Information Block (MIB) provides reference and scheduling information for a

number of SIBs in a cell or one or two Scheduling Blocks (SBs) in a cell. The MIBcontains only the PLMN types supported and the corresponding PLMN identities.

SB

Scheduling Block (SB) provides reference and scheduling information for other SIBs.The scheduling information of an SIB may be included in the MIB or SB.

SIB

System Information Block (SIB) contains actual system information. It consists ofsystem information elements (IEs) with the same purpose.

When selecting a new cell, the UE reads the MIB. The UE may locate the MIB through thepredefined scheduling information.

The UE may use the scheduling information in the MIB and SB to locate each SIB to beacquired. If the UE receives an SIB in a position according to the scheduling information andconsiders the content as valid, the UE will read and store the SIB.

Reception of System Information

The UE shall read system information broadcast on a BCH transport channel when the UE isin idle mode or connected mode (CELL_FACH, CELL_PCH, or URA_PCH state). Then, theUE takes actions on the following occasions:

When the UE is switched off

Except the SIBs stored in the USIM and used for the stored information cell selection,the UE shall consider other stored SIBs as invalid.

When the UE is switched on

The UE shall store SIBs with an area scope (cell, PLMN, or equivalent PLMN) and theirvalue tag. These SIBs are used when the UE returns to the cells.

When the UE selects a new cell in a new PLMN

The UE shall consider all current SIBs with an area scope (cell or PLMN) as invalid, andshall store and use a new SIB. If the identity of this PLMN is not equivalent to theidentity of the previously selected PLMN, the UE shall consider all SIBs with an areascope (equivalent PLMN) as invalid.

When the UE selects a new cell in the current PLMN


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The UE shall consider all current SIBs with an area scope (cell) as invalid, and shall store anduse a new SIB.

3.6.2 Cell Broadcast Service Reception

A UE supporting Cell Broadcast Service (CBS) can receive Broadcast/Multicast Control (BMC)

messages in idle mode. The UE receives BMC messages during time intervals that do notconflict with the UE specific paging occasions.

3.6.3 MBMS Reception

If all of the following conditions are met:

The UE has activated MBMS services.

The MBMS is available in the cell. That is the MBMS point-to-multipoint ControlChannel (MCCH) information is provided on the Broadcast Control Channel (BCCH).

The UE is permitted to receive MBMS in the cell.

Then, the UE performs the following operations:

Receives the MCCH. Receives each FACH. Here, the FACH refers to the one on which the MBMS

point-to-multipoint Traffic Channel (MTCH) is mapped, and the MTCH refers to the onethat carries an activated MBMS service without the need of setting up an RRCconnection.

Participates in MBMS counting.

The UE may monitor the MBMS notification Indicator Channel (MICH) and receive theMBMS point-to-multipoint Scheduling Channel (MSCH).


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4 UE Behaviors in Idle Mode ParametersThis chapter provides information on the effective level and configuration of the parametersrelated to UE behaviors in idle mode.

Table 4-1 lists the parameters related to UE behaviors in idle mode.

Table 4-1Parameters related to UE behaviors in idle mode

Parameter Name Parameter ID EffectiveLevel

Configurationon...

Periodical location update timer T3212 RNC(ADDCNDOMAIN)

RNC

Attach/detach indication ATT RNC(ADDCNDOMAIN)

RNC

DRX cycle length coefficient DRXCYCLELENCOEF

RNC(ADDCNDOMAIN)

RNC

Min quality level Qqualmin Cell(ADDCELLSELRES

EL)RNC(ADDNRNCCELL)

RNC

Min RX level Qrxlevmin Cell(ADDCELLSELRESEL)

RNC

Max allowed UE UL TX power MaxAllowedUlTxPower

Cell(ADDCELLSELRESEL)RNC(ADDNRNCCELL)

RNC

Intra-freq cell reselection

threshold for idle mode

IdleSintrasearch Cell(ADDCELLSELRESEL)

RNC

Inter-freq cell reselection

threshold for idle mode

IdleSintersearch Cell(ADDCELLSELRESEL)

RNC


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Configurationon...

Inter-RAT cell reselection

threshold

SsearchRat Cell(ADDCELLSELRESEL)

RNC

HCS cell reselection threshold SsearchHCS Cell(ADDCELLHCS)

RNC

Use of HCS UseOfHcs Cell(ADDCELLHCS)Cell(ADDGSMCELL)RNC(ADDNRNCCELL)

RNC

HCS inter-rat reselection

threshold

SHCSRat Cell(ADDCELLHCS)

RNC

HCS search inter-rat limitthreshold SlimitSearchRat Cell(ADDCELLHCS) RNC

IdleQoffset1sn IdleQoffset1sn Cell(ADDINTERFREQNCELL)Cell(ADDINTRAFREQNCELL)

RNC

IdleQoffset2sn IdleQoffset2sn Cell(ADDINTERFREQNCELL)Cell(ADD

INTRAFREQNCELL)

RNC

Cell Sel-reselection quality

measure

QUALMEAS Cell(ADDCELLSELRESEL)

RNC

Hysteresis 1 for idle mode IdleQhyst1s Cell(ADDCELLSELRESEL)

RNC

Hysteresis 2 for idle mode IdleQhyst2s Cell(ADDCELLSELRESEL)

RNC

Reselection delay time Treselections Cell(ADDCELLSELRESEL)

RNC


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4-3


Configurationon...

HCS priority level HCSPrio Cell(ADDCELLHCS)Cell(ADDGSMCELL)RNC(ADDNRNCCELL)

RNC

Quality threshold for HCS

reselection

Qhcs Cell(ADDCELLHCS)Cell(ADDGSMCELL)RNC(ADDNRNCCELL)

RNC

HCS Cell Reselect Penalty

Timer

TpenaltyHcsReselect

Cell(ADDINTRAFREQNCELL)

Cell(ADDINTERFREQNCELL)Cell(ADDGSMNCELL)

RNC

HCS Cell Reselect TempOffset1 TempOffset1 Cell(ADDINTRAFREQNCELL)Cell(ADDINTERFREQNCELL)Cell(ADD

GSMNCELL)

RNC

HCS Cell Reselect TempOffset2 TempOffset2 Cell(ADDINTRAFREQNCELL)Cell(ADDINTERFREQNCELL)

RNC


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5 Reference DocumentsThis describes the reference documents related to UE behaviors in idle mode.

3GPP, TS 22.011 "Service accessibility"

3GPP, TS 23.122 "NAS Functions related to Mobile Station (MS) in idle mode"

3GPP, TS 24.008 "Mobile radio interface layer 3 specification; Core Network Protocols -Stage 3"

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

3GPP, TS 25.331 "Radio Resource Control (RRC)"

3GPP, TS 31.102 "Characteristics of the USIM Application"