ue behaviors in idle-mode description_2008-07-30__irm.pdf
TRANSCRIPT
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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
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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 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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ChangeType
Change Description ParameterChange
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
Change Description ParameterChange
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
Change Description ParameterChange
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 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 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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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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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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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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Parameter Name Parameter ID EffectiveLevel
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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Parameter Name Parameter ID EffectiveLevel
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"