UE Behaviors in Idle-Mode Description(2008!03!20)

RAN

UE Behaviors in Idle Mode Description

Issue Draft

Date 2008-03-20

Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd

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Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd

http://www.huawei.com

mailto:[email protected]

Contents

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

1 UE Behaviors in Idle Mode Change History........................................................................1-1

2 UE Behaviors in Idle Mode Overview...................................................................................2-12.1 Introduction to UE Behaviors in Idle Mode....................................................................................................2-22.2 Supported Software Release for UE Behaviors in Idle Mode.........................................................................2-3

3 UE Behaviors in Idle Mode Technical Description.............................................................3-13.1 UE Behaviors in Idle Mode.............................................................................................................................3-2

3.1.1 PLMN Selection ....................................................................................................................................3-23.1.2 Cell Selection.........................................................................................................................................3-33.1.3 Cell Reselection......................................................................................................................................3-63.1.4 Location Registration...........................................................................................................................3-133.1.5 Paging Reception..................................................................................................................................3-153.1.6 System Information Reception.............................................................................................................3-16

3.2 UE Behaviors in Idle Mode Parameters........................................................................................................3-17

4 Implementing UE behaviors in idle mode............................................................................4-1

5 UE Behaviors in Idle Mode Reference Documents.............................................................5-1

RANUE Behaviors in Idle Mode Description Contents

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

i

Figures

Figure 3-1 Cell selection procedure for the UE in idle mode...............................................................................3-4Figure 3-2 Measurement start criteria for cell reselection with HCS disabled....................................................3-7Figure 3-3 Cell reselection procedure................................................................................................................3-12

RANUE Behaviors in Idle Mode Description Figures


iii

Tables

Table 1-1 Document and product versions...........................................................................................................1-1Table 2-1 NEs involved in the feature UE behaviors in idle mode......................................................................2-3Table 2-2 RAN products and related versions......................................................................................................2-3Table 3-1 UE states involved in the cell selection................................................................................................3-5Table 3-2 Intra-frequency and inter-frequency measurement criteria for the UE in slow movement.................3-8Table 3-3 Intra-frequency and inter-frequency measurement criteria for the UE in fast movement...................3-9Table 3-4 Inter-RAT measurement criteria for the UE in slow movement..........................................................3-9Table 3-5 Inter-RAT measurement criteria for the UE in fast movement............................................................3-9Table 3-6 Mapping between the parameters in formulas and the parameters in the LMT.................................3-11Table 3-7 Parameter list of UE behaviors in idle mode.....................................................................................3-17

RANUE Behaviors in Idle Mode Description Tables


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About This Document

RANUE Behaviors in Idle Mode Description About This Document


1

1 UE Behaviors in Idle Mode Change History

This describes the changes in different document versions.

Table 1-1 Document and product versions

DocumentVersion

RAN Version RNC Version NodeB Version

Draft(2008-03-20)

10.0 V200R010C01B050 V100R010C01B045

Document and Product Versions

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

l Feature change: refers to the change in the feature UE behaviors in idle mode of a specificproduct version.

l Editorial change: refers to the change in the information that was inappropriately describedor the addition of the information that was not described in the earlier version.

Draft (2008-03-20)

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

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

ChangeType

Change Description Parameter Change

Featurechange

None. None.

Editorialchange

The parameter lists are moved to 3.2 UEBehaviors in Idle Mode Parameters and thehyperlinks are made to the correspondingparameter tables.

None.

RANUE Behaviors in Idle Mode Description 1 UE Behaviors in Idle Mode Change History


1-1

ChangeType

Change Description Parameter Change

Implementing information has been moved to aseparate document. For information on how toimplementing UE behaviors in idle mode, pleasesee Configuring UE behaviors in idle mode inRAN Feature Configuration Guide.

1 UE Behaviors in Idle Mode Change HistoryRAN


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

Issue Draft (2008-03-20)

2 UE Behaviors in Idle Mode Overview

About This Chapter

UE behaviors in idle mode ensure the UE get ready for start a service at any moment.

2.1 Introduction to UE Behaviors in Idle ModeThis describes the UE behaviors in idle mode in terms of the purposes and Network Elements(NEs) involved.

2.2 Supported Software Release for UE Behaviors in Idle ModeSupported Software Releases provides information on the software environments, where thefeature is supported,

RANUE Behaviors in Idle Mode Description 2 UE Behaviors in Idle Mode Overview


2-1

2.1 Introduction to UE Behaviors in Idle ModeThis describes the UE behaviors in idle mode in terms of the purposes and Network Elements(NEs) involved.

IntroductionDefinition

The UE enters the idle mode immediately after the switch-on. The feature "UE behaviors in idlemode" ensures that the UE is ready to start a service (for example, to make a call or pick a call).The behaviors mainly include network selection, location registration, paging reception, andsystem information reception.

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

2. Cell selection and reselectionThis procedure ensures that the UE finds a suitable cell to camp on.

3. Location registrationThis procedure is used by the UE to report its status to the network. This procedure is mainlyof two types: periodical location registration and the location registration caused by locationarea change.

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

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

l System information receptionThe network broadcasts the network information to the UE that camps on the cell. Uponreception of system information, the UE obtains the network information and takes actionsaccordingly.

Purposes

This feature enables the UE to behave as follows:

l Receive system information from the PLMN

l Get ready to establish the RRC connection

l Get ready to respond to paging messages

l Receive cell broadcast services

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

ImpactImpact on System Performance

This feature has impacts on the following aspects:

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

2 UE Behaviors in Idle Mode OverviewRAN




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

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

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

Impact on Other Features

None.

Network Elements InvolvedTable 2-1 describes the NEs involved in the feature UE behaviors in idle mode.

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

UE NodeB RNC MSCServer

MGW SGSN GGSN HLR

√ √ √ – – – – –

NOTE

l –: not involved

l √: involved

2.2 Supported Software Release for UE Behaviors in IdleMode

Supported Software Releases provides information on the software environments, where thefeature is supported,

Table 2-2 describes the versions of RAN products that support the feature.

Table 2-2 RAN products and related versions

Product Version

RNC BSC6800 V100R002 and later releases

BSC6810 V200R009 and later releases

NodeB DBS3800 V100R005 and later releases

BTS3812A

BTS3812E

iDBS3800 V100R008 and later releases

BTS3812AE

RANUE Behaviors in Idle Mode Description 2 UE Behaviors in Idle Mode Overview


2-3

3 UE Behaviors in Idle Mode TechnicalDescription

About This Chapter

This describes the technical aspects of UE behaviors in idle mode and the parameters.

3.1 UE Behaviors in Idle ModeAfter the UE is switched on, it can access the network through automatic PLMN selection, cellselection/reselection, and location registration to obtain network services. In addition, the UEin idle mode can also respond to paging and receive system information.

3.2 UE Behaviors in Idle Mode ParametersThis lists the parameters related to UE behaviors in idle mode and the parameter tables.

RANUE Behaviors in Idle Mode Description 3 UE Behaviors in Idle Mode Technical Description


3-1

3.1 UE Behaviors in Idle ModeAfter the UE is switched on, it can access the network through automatic PLMN selection, cellselection/reselection, and location registration to obtain network services. In addition, the UEin idle mode can also respond to paging and receive system information.

3.1.1 PLMN SelectionAt switch-on, or following recovery from lack of coverage, or selecting a cell that belongs toother PLMNs, the UE will select a PLMN. The PLMN selection procedure is used for findinga suitable PLMN.

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

3.1.3 Cell ReselectionThe signal strength of both serving cell and neighboring cells varies with the movement of a UEand 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, measurement startcriteria, and cell reselection criteria.

3.1.4 Location RegistrationLocation 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 perform anyoperation for a long period.

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

3.1.6 System Information ReceptionUpon reception of system information, the UE obtains the network information and takes actionsaccordingly.

3.1.1 PLMN SelectionAt switch-on, or following recovery from lack of coverage, or selecting a cell that belongs toother PLMNs, the UE will select a PLMN. The PLMN selection procedure is used for findinga suitable PLMN.

There are two modes of PLMN selection:

l Automatic selection

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

l Manual selection

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

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).

3 UE Behaviors in Idle Mode Technical DescriptionRAN




NOTE

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

l 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:

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 6 minutesto 8 hours in 6-minute steps or T indicates that no periodic attempts shall be made. If no valueis 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:

l 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.

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

l 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.

Manual PLMN SelectionTo 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.

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

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

Cell Selection ProcedureFigure 3-1 shows the cell selection procedure for the UE in idle mode.



3-3

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

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

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





Table 3-1 UE states involved in the cell selection

SN

State Description

1 Camped normally The UE obtains normal services.

2 Connected mode After RRC connection setup, the UE changes from the idlemode to the connected mode (CELL_DCH, CELL_FACH,CELL_PCH, or URA_PCH state)

3 Any cell selection The UE attempts to find an acceptable cell of any PLMN tocamp on.

4 Camped on any 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:

l 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 need onlysearch for the strongest cell. Once a suitable cell is found, this cell shall be selected.

l Stored information cell selection

For this procedure, the UE need know the central frequency information and other optionalcell parameters that are obtained from the measurement control information receivedbefore, such as scrambling codes.

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

l Suitable cell

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

l 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 before theUE leaves the connected mode.

When returning to the idle mode after an emergency call on any PLMN, the UE shall selectan 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".

l Acceptable cell

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



3-5

Cell Selection Criteria

The cell selection criterion S is fulfilled when:

Srxlev > 0 and Squal > 0

where

l Squal = Qqualmeas – Qqualmin

l 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 valueQuality of the received signal indicated in average CPICH Ec/N0 (dB)for FDD cellsApplicable only to FDD cells

Qrxlevmeas Measured cell RX level valueCPICH RSCP of received signal for FDD cells (dBm) and P-CCPCHRSCP of received signal for TDD cells (dBm)

Qqualmin Refer to Min quality level.

Qrxlevmin Refer to Min RX level.

Pcompensation Max (UE_TXPWR_MAX_RACH – P_MAX, 0) (dBm)wherel UE_TXPWR_MAX_RACH: refers to Max allowed UE UL TX

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

3.1.3 Cell ReselectionThe signal strength of both serving cell and neighboring cells varies with the movement of a UEand 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, measurement startcriteria, and cell reselection criteria.

Cell Reselection ProcessNOTE

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

The cell reselection process is as follows:





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

l Squal = Qqualmeas - Qqualmin

l Srxlev = Qrxlevmeas - Qrxlevmin - Pcompensation

NOTEFor detailed description of the formulas, refer to 3.1.2 Cell Selection.

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

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

l Otherwise, end the cell reselection.

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

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

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

l 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 the intra-frequency measurement.



3-7

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

l 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 the inter-frequency measurement.

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

l Inter-RAT measurement

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

– 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 in Table3-2, Table 3-3, Table 3-4, and Table 3-5.

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

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

Condition Result

Srxlev ≤ SsearchHCS or Squal ≤Sintersearch

All intra-frequency and inter-frequency cells aremeasured.

Squal ≤ Sintrasearch Intra-frequency and inter-frequency cells aremeasured with their HCS level no lower than that ofthe current cell.

Squal > Sintrasearch Intra-frequency and inter-frequency cells aremeasured with their HCS level higher than that of thecurrent cell.

Sintrasearch not delivered All intra-frequency cells are measured.Inter-frequency cells are measured with their HCSlevel higher than that of the current cell.

SsearchHCS or Sintersearch notdelivered


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.

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

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

Condition Result

Srxlev ≤ SsearchHCS or Squal ≤Sintersearch


SsearchHCS or Sintersearch notdelivered


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.

l Inter-RAT measurement criteria for UE in slow movement

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

Condition Result

Srxlev ≤ SHCS,RATm or Squal≤ SSearchRATm

Inter-RAT cells are measured.

Squal ≤ Slimit,SearchRATm Inter-RAT cells are measured when the HCS level ofinter-RAT cells is higher than or equal to that of thecurrent 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.

l Inter-RAT measurement criteria for the UE in fast movement

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

Condition Result

Srxlev ≤ SHCS,RATm or Squal ≤SSearchRATm




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Condition Result

SHCS,RATm or SSearchRATm notdelivered


Others such as Srxlev and Squal aregood.

All inter-RAT cells are measured when the HCSlevel of inter-RAT cells is lower than or equal to thatof the current cell.

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 the prioritizedranking based on the hierarchical cell reselection rules shall apply. The criterion is defined by:

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

The cell-ranking criterion R is defined by:

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 3-6 Mapping 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

Qhysts IdleQhyst1s Hysteresis 1 for idle mode

IdleQhyst2s Hysteresis 2 for idle mode

TEMP_OFFSETn TempOffset1 HCS Cell ReselectTempOffset1

TempOffset2 HCS Cell ReselectTempOffset2

PENALTY_TIMEn TpenaltyHcsReselect HCS Cell Reselect PenaltyTimer

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



3-11

Figure 3-3 Cell reselection procedure

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

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

l 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.

l When HCS is used and UE is in high mobility and if there are cells with a lower HCSpriority than the serving cell that fulfil the criterion H >= 0, the UE shall rank all cells thathave the highest HCSPrio among those cells that fulfil the criterion H >=0 and have alower HCS priority than the serving cell.

l When HCS is used and UE is in high mobility and if there are cells that fulfil the criterionH >= 0 with an HCS priority higher or equal to the HCS priority of the serving cell, the UE





shall rank all cells that have the lowest HCSPrio that fulfil the criterion H >= 0 and havean HCS priority higher or equal to the HCS priority of the serving cell.

l 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 and Qmeas,sand calculating the R values, as described in the cases below.

The offset IdleQoffset1sn is used for Qoffsets,n to calculate Rn. The hysteresis IdleQhyst1s isused for Qhysts to calculate Rs.

l 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 cell with thehighest R value.

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

l 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 reselect thatFDD cell.

l 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 asecond 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 derivingthe Qmeas,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 isused for Qhysts to calculate Rs.If the system information indicates that the HCS is enabled, TempOffset2 is used tocalculate TOn. Otherwise, TEMP_OFFSETn is not used to calculate Rn. Following thesecond 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 conditions aremet:

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

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

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

3.1.4 Location RegistrationLocation 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 perform anyoperation for a long period.

Classification of Location Registration

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

l Normal location registration

l Periodic location registration



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l IMSI attach/detach

NOTEFor the procedure of location registration, refer to Location Update Procedure.

Normal Location RegistrationThe UE performs normal location registration in the following conditions:

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

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

Periodic Location RegistrationPeriodic location registration may be used to periodically notify the network of the availabilityof 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 sentby 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:

l 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.

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

l The timer T3212 shall be prevented from triggering periodic location update in connectedmode. When the UE returns to the idle mode, T3212 shall be initiated with respect to thebroadcast timeout value and then be started.

l 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-GPRS servicesonly.

IMSI Attach/DetachThe 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 the UPDATEDstate. 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.





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 request indicatingnormal location update.

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

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

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 the S-CCPCHcarries specific paging messages.

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. The intervalbetween two consecutive periods of time is called DRX cycle.

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

l CN domain specific DRX cycle length for CS

l CN domain specific DRX cycle length for PS

l 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 specific DRX cyclelengths. The UE shall store these lengths for all CN domains where the UE is attached and shalluse 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 SETUP messagewithout distinguishing specific CN domain types.

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

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

l UTRAN DRX cycle length

l Any of the stored DRX cycle length for the CN domains where the UE is attached, with nosignaling connection established



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

3.1.6 System Information ReceptionUpon reception of system information, the UE obtains the network information and takes actionsaccordingly.

Structure of System Information

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

l MIB

Master Information Block (MIB) provides reference and scheduling information for anumber of SIBs in a cell or one or two Scheduling Blocks (SBs) in a cell. The MIB containsonly the PLMN types supported and the corresponding PLMN identities.

l SB

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

l SIB

System Information Block (SIB) contains actual system information. It consists of systeminformation 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 be acquired.If the UE receives an SIB in a position according to the scheduling information and considersthe 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 is inidle mode or connected mode (CELL_FACH, CELL_PCH, or URA_PCH state). Then, the UEtakes actions on the following occasions:

l When the UE is switched off

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

l 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.

l 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 the identityof the previously selected PLMN, the UE shall consider all SIBs with an area scope(equivalent PLMN) as invalid.

l When the UE selects a new cell in the current PLMN





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

3.2 UE Behaviors in Idle Mode ParametersThis lists the parameters related to UE behaviors in idle mode and the parameter tables.

Parameter list of UE behaviors in idle mode

Table 3-7 lists the parameters related to UE behaviors in idle mode, in terms of parameter ID,effective level, and configuration entity.

Table 3-7 Parameter list of UE behaviors in idle mode

Parameter Name Parameter ID EffectiveLevel

Configuration on ...

Periodical location updatetimer

T3212 Global RNC

Attach/detach indication ATT Global RNC

DRX cycle lengthcoefficient

DRXCYCLELENCOEF Global RNC

Min quality level Qqualmin Cell RNC

Min RX level Qrxlevmin Cell RNC

Max allowed UE UL TXpower

MaxAllowedUlTxPower Cell RNC

Intra-freq cell reselectionthreshold for idle mode

IdleSintrasearch Cell RNC

Inter-freq cell reselectionthreshold for idle mode

IdleSintersearch Cell RNC

Inter-RAT cell reselectionthreshold

SsearchRat Cell RNC

HCS cell reselectionthreshold

SsearchHCS Cell RNC

Use of HCS UseOfHcs Cell RNC

HCS inter-rat reselectionthreshold

SHCSRat Cell RNC

HCS search inter-rat limitthreshold

SlimitSearchRat Cell RNC

IdleQoffset1sn IdleQoffset1sn Cell RNC

IdleQoffset2sn IdleQoffset2sn Cell RNC



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Parameter Name Parameter ID EffectiveLevel

Configuration on ...

Hysteresis 1 for idle mode IdleQhyst1s Cell RNC

Hysteresis 2 for idle mode IdleQhyst2s Cell RNC

Reselection delay time Treselections Cell RNC

HCS priority level HCSPrio Cell RNC

Quality threshold for HCSreselection

Qhcs Cell RNC

Time for evaluating maxcell reselection

TCRmax Cell RNC

Max number of cellreselection

CRMaxNum Cell RNC

Time before revert to low-mobility meas

TCrmaxHyst Cell RNC

HCS Cell Reselect PenaltyTimer

TpenaltyHcsReselect Cell RNC

HCS Cell ReselectTempOffset1

TempOffset1 Cell RNC

HCS Cell ReselectTempOffset2

TempOffset2 Cell RNC

Non-HCS max TCR Tcrmaxnonhcs Cell RNC

Non-HCS NCR Ncrnonhcs Cell RNC

Time before revert to low-mobility meas

Tcrmaxhystnonhcs Cell RNC

Speed dependent scalingfactor for reselection

SpeedDependentScaling-Factor

Cell RNC

Inter-freqency scalingfactor for reselection

InterFreqTreselScalingFac-tor

Cell RNC

Inter-RAT scaling factorfor reselection

InterRatTreselScalingFac-tor

Cell RNC

The following tables describe the detailed information about the parameters related to UEbehaviors in idle mode.

Parameter TablesParameter Name Intra-freq cell reselection threshold for idle mode





Parameter ID IdleSintrasearch

GUI Range –16 to 10, 127

Physical Range and Unit –32 to 20Step: 2Unit: dB

Default Value None

Optional/Mandatory Optional

Effective Level Cell

Configuration Entity RNC

MML Command ADD CELLSELRESEL/MOD CELLSELRESEL

Description This parameter is the threshold for intra-frequency cellreselection of the UE in idle mode. When the quality (CPICHEc/No measured by the UE) of the serving cell is lower thanthis threshold plus Min quality level of the cell, the intra-frequency cell reselection procedure will be started.

Parameter Name Inter-RAT cell reselection threshold

Parameter ID SsearchRat



Default Value 2





Description This parameter is the threshold for inter-RAT cellreselection. When the quality (CPICH Ec/Nomeasured by UE) of the serving cell is lower than thisthreshold plus Min quality level of the cell, the inter-RAT cell reselection procedure will be started. Thisparameter is not configured when its value is 127.



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Parameter Name HCS inter-rat reselection threshold

Parameter ID SHCSRat

GUI Range –53 to 45

Physical Range and Unit –105 to 91Step: 2 (–53:–105; –52:–103; ..., 45:91)Unit: dB

Default Value 0




MML Command ADD CELLHCS/MOD CELLHCS

Description This parameter is the threshold for HCS cell reselectionbetween different systems.

Parameter Name HCS search inter-rat limit threshold

Parameter ID SlimitSearchRat

0GUI Range –16 to 10


Default Value 0




MML Command ADD CELLHCS/MOD CELLHCS

Description This parameter is the limit threshold for HCS cell reselectionbetween different systems. The UE need not start the inter-RAT measurement if it detects that the quality of the servingcell is higher than this threshold.

Parameter Name SIB11 Indicator

Parameter ID SIB11Ind





GUI Range FALSE, TRUE

Physical Range and Unit None.

Default Value TRUE




MML Command ADD INTRAFREQNCELLMOD INTRAFREQNCELLADD INTERFREQNCELLMOD INTERFREQNCELL

Description Flag of whether to include this neighboringrelationship in the System Information Block 11(SIB11)

Parameter Name IdleQoffset1sn

Parameter ID IdleQoffset1sn


Physical Range and Unit –50 to 50Unit: dB

Default Value 0




MML Command ADD INTRAFREQNCELLMOD INTRAFREQNCELLADD INTERFREQNCELLMOD INTERFREQNCELLADD GSMNCELLMOD GSMNCELL



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Description This parameter defines the offset of cell CPICH RSCPmeasurement value in cell selection or reselectionwhen the UE is in idle mode. This parameter is usedfor moving the border of a cell. The larger the value ofthis parameter is, the lower the probability ofneighboring cell selection is.NOTE

In FDD mode, this parameter is valid only when SIB11Indicator is set as TRUE.

Parameter Name IdleQoffset2sn

Parameter ID IdleQoffset2sn



Default Value 0




MML Command ADD INTRAFREQNCELLMOD INTRAFREQNCELLADD INTERFREQNCELLMOD INTERFREQNCELL

Description This parameter defines the offset of cell CPICH Ec/Nomeasurement value in cell selection or reselectionwhen the UE is in idle mode. This parameter is usedfor moving the border of a cell. The larger the value ofthis parameter is, the lower the probability ofneighboring cell selection is.NOTE

In FDD mode this parameter is valid only when SIB11Indicator is set as TRUE.

Parameter Name Hysteresis 1 for idle mode

Parameter ID IdleQhyst1s

GUI Range 0 to 20





Physical Range and Unit 0 dB to 40 dBStep: 2Unit: dB

Default Value 2




MML Command ADD CELLSELRESELMOD CELLSELRESEL

Description The hysteresis value in idle mode for serving FDDcells in case the quality measurement for cell selectionand reselection is set to CPICH RSCP. It is related tothe slow fading feature of the area where the cell islocated. The greater the slow fading variance is, thegreater the value of this parameter is.

Parameter Name Hysteresis 2 for idle mode

Parameter ID IdleQhyst2s

GUI Range 0 to 20, 255

Physical Range and Unit 0dB to 40dBStep: 2Unit: dB

Default Value IdleQhyst1s





Description The hysteresis value in idle mode for serving FDDcells in case the quality measurement for cell selectionand reselection is set to CPICH Ec/No. It is related tothe slow fading feature of the area where the cell islocated. The greater the slow fading variance is, thegreater the value of this parameter is. It is optional. Ifit is not configured, [Hysteresis 1] will be adopted asthe value. This parameter is not configured when itsvalue is 255.



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Parameter Name Cell Sel-reselection quality measure

Parameter ID QUALMEAS

GUI Range CPICH_ECNO(CPICH Ec/N0), CPICH_RSCP(CPICHRSCP)

Physical Range and Unit None

Default Value CPICH_ECNO





Description This parameter indicates which method (based on ECNO orRSCP) will be used for cell selection and reselection qualitymeasurement.

Parameter Name Min quality level

Parameter ID Qqualmin



Default Value –18





Description This parameter is the minimum required quality levelthat corresponds to CPICH Ec/No. The UE can campon the cell only when the measured CPICH Ec/No isgreater than the value of this parameter.

Parameter Name Min RX level

Parameter ID Qrxlevmin

GUI Range –58 to –13





Physical Range and Unit –115 to –25Step: 2 (–58:–115; –57:–113; ..., –13:25)Unit: dBm

Default Value –58





Description This parameter is the minimum required RX level thatcorresponds to CPICH RSCP. The UE can camp onthe cell only when the measured CPICH RSCP isgreater than the value of this parameter.

Parameter Name Max allowed UE UL TX power

Parameter ID MaxAllowedUlTxPower


Physical Range and Unit Unit: dBm

Default Value None





Description This parameter is the maximum allowed uplinktransmit power of a UE on the RACH (read in systeminformation) when the UE accesses the cell.

Parameter Name Inter-freq cell reselection threshold for idle mode

Parameter ID IdleSintersearch


Physical Range and Unit –32dB to 20dBStep: 2dB

Default Value None



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Description A threshold for inter-frequency cell reselection in idlemode. When the quality (CPICH Ec/No measured byUE) of the serving cell is lower than this threshold plusthe Qqualmin of the cell, the inter-frequency cellreselection procedure will be started. This parameteris not configured when its value is 127.

Parameter Name Reselection delay time

Parameter ID Treselections

GUI Range 0 to 31

Physical Range and Unit 0 to 31Step: 1 second

Default Value 1





Description If the signal quality of a neighboring cell is better thanthe serving cell during the specified time of thisparameter, the UE will reselect the neighboring cell. Itis used to avoid ping-pong reselection betweendifferent cells. Note that the value 0 corresponds to thedefault value defined in the protocol.

Parameter Name Use of HCS

Parameter ID UseOfHcs

GUI Range USED, NOT_USED


Default Value NOT_USED








MML Command ADD CELLHCSMOD CELLHCS

Description None.

Parameter Name HCS priority level

Parameter ID HCSPrio

GUI Range 0 to 7


Default Value 0





Description None.

Parameter Name Quality threshold for HCS reselection

Parameter ID Qhcs

GUI Range 0 to 99

Physical Range and Unit l When CPICH Ec/No (FDD) is used, the unit of Qhcsis dB. The mapping relationship is as follows: 0: -241: -23.5 2: -23 3: -22.5 ... 45: -1.5 46: -1 47: -0.5 48:0 49: (spare) ... 98: (spare) 99: (spare)

l When CPICH RSCP (FDD) is used, the unit of Qhcsis dBm. The mapping relationship is as follows: 0:-115 1: -114 2: -113 : 88: -27 89: -26 90: -(spare)91: -(spare) : 98: -(spare) 99: -(spare)

Default Value 20






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Description None.

Parameter Name Time for evaluating max cell reselection

Parameter ID TCRmax

GUI Range NOT_USED, D30, D60, D120, D180, D240

Physical Range and Unit 0, 1, 2, 3, 4, 5Unit: s

Default Value D60





Description None.

Parameter Name Max number of cell reselection

Parameter ID CRMaxNum

GUI Range 0 to 16


Default Value 8





Description None.

Parameter Name Time before revert to low-mobility meas





Parameter ID TCrmaxHyst

GUI Range NOT_USED, D10, D20, D30, D40, D50, D60, D70

Physical Range and Unit 0, 1, 2, 3, 4, 5, 6, 7Unit: s

Default Value D20





Description This parameter specifies the time before reverting tolow-mobility measurement.

Parameter Name HCS Cell Reselect Penalty Timer

Parameter ID TpenaltyHcsReselect

GUI Range D0, D10, D20, D30, D40, D50, D60

Physical Range and Unit 0, 10, 20, 30, 40, 50, 60Unit: s

Default Value D0





Description The larger the value of this parameter is, the longer thepenalty time for HCS cell reselection is.

Parameter Name HCS Cell Reselect TempOffset1



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Parameter ID TempOffset1

GUI Range D3, D6, D9, D12, D15, D18, D21, Infinity

Physical Range and Unit 3, 6, 9, 12, 15, 18, 21, 255Unit: dB

Default Value D3





Description This is the offset of cell CPICH RSCP measurementvalue in HCS cell selection or reselection. The largerthe value of the parameter is, the lower the probabilityfor neighboring cell selection is.

Parameter Name HCS Cell Reselect TempOffset2

Parameter ID TempOffset2

GUI Range D2, D3, D4, D6, D8, D10, D12, Infinity

Physical Range and Unit 2, 3, 4, 6, 8, 10, 12, 255Unit: dB

Default Value D2









Description This parameter defines the offset of cell CPICH Ec/Nomeasurement value in cell selection or reselection. Thelarger the value of the parameter is, the lower theprobability for neighboring cell selection is.

Parameter Name Non-HCS max TCR

Parameter ID Tcrmaxnonhcs

GUI Range not used,D30,D60,D120,D180,D240

Physical Range and Unit not used,30,60,120,180,240Unit: s

Default Value not used





Description This parameter specifies the maximum duration ofnon-HCS cell reselection.

Parameter Name Non-HCS NCR

Parameter ID Ncrnonhcs

GUI Range 1 to 16

Physical Range and Unit 1 to 16Unit: times

Default Value 8





Description This parameter specifies the maximum number of non-HCS cell reselection.



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Parameter Name Non-HCS TCR max hysteresis

Parameter ID Tcrmaxhystnonhcs

GUI Range not used,D10, D20, D30, D40, D50, D60, D70

Physical Range and Unit not used,10, 20, 30, 40, 50, 60, 70Unit: s

Default Value None.





Description This parameter specifies the extra time before non-HCS resume slow movement.

Parameter Name Speed dependent scaling factor for reselection

Parameter ID SpeedDependentScalingFactor


Physical Range and Unit 0 to 1Step: 0.1Unit: None

Default Value None.





Description This parameter specifies the multiple reselection delaytime for the high-speed UE to decrease the reselectiondelay time. This parameter can be set as 10 for themiddle-speed UE, which means that there is noinfluence on reselection delay time. This parameter isnot configured when its value is 255.





Parameter Name Inter-freqency scaling factor for reselection

Parameter ID InterFreqTreselScalingFactor


Physical Range and Unit 1 to 4.75Step: 0.25Unit: None

Default Value None.





Description This parameter is used to increase the time of inter-frequency reselection. This parameter is notconfigured when its value is 255.

Parameter Name Inter-RAT scaling factor for reselection

Parameter ID InterRatTreselScalingFactor


Physical Range and Unit 1 to 4.75Step: 0.25Unit: None

Default Value None.





Description This parameter is used to increase the inter-RATreselection delay. This parameter is not configuredwhen its value is 255.

Parameter Name HCS cell reselection threshold



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Parameter ID SsearchHCS



Default Value 0





Description The GUI value and physical value are mapped as: (-53:-105; -52: -103; ..., 45: 91)

Parameter Name Periodical location update timer

Parameter ID T3212

GUI Range 0 to 255

Physical Range and Unit 1*6, 2*6, 3*6,…, 255*6Unit: minuteThe value 0 means that the periodic location updateprocedure is not performed.

Default Value 10


Effective Level Global


MML Command MOD CNDOMAIN / ADD CNDOMAIN

Description This parameter defines the time interval of the periodiclocation update of the UE. The value 0 means that theperiodic update procedure is not performed. This parameteris valid only when CN domain ID is set as CS_DOMAIN.

Parameter Name DRX cycle length coefficient

Parameter ID DRXCYCLELENCOEF





GUI Range 6 to 9

Physical Range and Unit 26to 29

Unit: 10 ms

Default Value 6





Description This parameter specifies the coefficient of CN domainspecific DRX cycle lengths broadcast in SIB 1 and used bythe UEs in idle mode.

Parameter Name Attach/detach indication

Parameter ID ATT

GUI Range NOT_ALLOWED, ALLOWED


Default Value ALLOWED





Description This parameter indicates whether attach/detach is allowed.NOT_ALLOWED indicates that MS cannot apply theIMSI attach/detach procedure. ALLOWED indicates thatMS can apply the IMSI attach/detach procedure. Thisparameter is valid only when CN domain ID is set asCS_DOMAIN.



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4 Implementing UE behaviors in idle mode

Implementing UE behaviors in idle mode provides information on and examples of how toenable, reconfigure, and disable the feature.

For detail information, see Configuring UE behaviors in idle mode in RAN FeatureConfiguration Guide.

RANUE Behaviors in Idle Mode Description 4 Implementing UE behaviors in idle mode


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5 UE Behaviors in Idle Mode ReferenceDocuments

This describes the reference documents related to UE behaviors in idle mode.

l 3GPP, TS 22.011 "Service accessibility"

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

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

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

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

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

RANUE Behaviors in Idle Mode Description 5 UE Behaviors in Idle Mode Reference Documents


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UE Behaviors in Idle-Mode Description(2008!03!20)

Documents

Transcript of UE Behaviors in Idle-Mode Description(2008!03!20)