ue in idle mode behavior pd

RAN

UE Behaviors in Idle Mode Parameter Description

Issue 01

Date 2009-03-30

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RANUE Behaviors in Idle Mode Parameter Description

About This Document

About This Document

Author

Prepared by Yu Lunfeng Date 2008-10-20

Edited by Sun Jingshu Date 2008-12-09

Reviewed by Date

Translated by Shi Mengting Date 2008-12-09

Tested by Tang Min Date 2009-01-10

Approved by Duan Zhongyi Date 2009-03-30

Issue 01 (2009-03-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,

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Contents

Contents

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

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

3 UE Behaviors in Idle Mode Principles...........................................3-23.1 PLMN Selection.............................................................................................................................................3-2

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

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

3.2 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...............................................................................................................3-2

3.4.3 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.........................................4-24.1 Description.....................................................................................................................................................4-2

4.2 Values and Ranges..........................................................................................................................................4-2

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


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1 Change History

The change history provides information on the changes in different document versions.

Document and Product Versions

Table 1-1 Document and product versions

Document Version RAN Version

01 (2009-03-30) 11.0

Draft (2009-03-10) 11.0

Draft (2009-01-15) 11.0

This document is based on the BSC6810 and 3900 series NodeBs.

The available time of each feature is subject to the RAN product roadmap.

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

Feature change: refers to the change in the UE behaviors in idle mode feature.

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

01 (2009-03-30)

This is the document for the first commercial release of RAN11.0.

Compared with draft (2009-03-10), this issue optimizes the description.

Draft (2009-03-10)

This is the second draft of the document for RAN11.0.

Compared with draft (2009-01-15), draft (2009-03-10) optimizes the description.


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Draft (2009-01-15)

This is the initial draft of the document for RAN11.0.

Compared with issue 02 (2008-07-30) of RAN10.0, draft (2009-01-15) incorporates the following changes:

Change Type Change Description Parameter Change

Feature change None. None.

Editorial change The title of the document is changed from UE Behaviors in Idle Mode Description to UE Behaviors in Idle Mode Parameter Description.

None.


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2 UE Behaviors in Idle Mode

Introduction

The UE enters the idle mode immediately after being switched on. The feature "UE behaviors in idle mode" ensures that the UE is ready to start a service (for example, to make a call or pick a call).

The behaviors are as follows:

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 is of two types: periodical location registration and the location registration necessitated by changes in the location area.

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

Paging reception

The network sends paging messages to the UE in CELL_PCH or URA_PCH state.

The UE detects the paging indicator on the PICH within the predefined time and receives corresponding paging messages on the S_CCPCH. If the cell and the UE in CELL_FACH support the HS-DSCH function, UE in CELL_PCH or URA_PCH state receives paging messages on the HS-PDSCH.

Broadcast information reception

The network broadcasts the network information to the UE that camps on the cell. Upon reception of broadcast information, the UE obtains the network information and takes actions accordingly.

This feature enables the UE for the following:

Receive system information from the PLMN

Prepare to establish the RRC connection

Prepare to respond to paging messages

Receive cell broadcast services


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Report the UE state to the network periodically or in event-triggered mode

Intended Audience

This document is intended for:

System operators who need a general understanding of UE behaviors in idle mode.

Personnel working on Huawei products or systems.

Impact Impact on System Performance

This feature has impacts on the following aspects:

− 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, the UE may fail to access the cell.

Impact on Other Features

None.

Network Elements Involved

Table 2-1 describes the Network Elements (NEs) involved in UE behaviors in idle mode.

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

UE NodeB

RNC MSC Server

MGW SGSN GGSN HLR

√ √ √ – – – – –

NOTE: –: not involved √: involved

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


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Principles

3.1 PLMN SelectionWhen the UE is switched on, or the coverage is restored, or the UE selects a cell that belongs to another PLMN, the UE selects the registered PLMN or its equivalent PLMN. If no registered PLMN or equivalent PLMN is available, 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 a PLMN.

Exceptions: As an option, in automatic network selection mode, the UE selects a PLMN from the HPLMNs. Operators can select this option in SIM card setting.

3.1.1 Automatic PLMN SelectionIn 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, which are in the PLMN identity of the HPLMN, match the MCC and MNC in the IMSI of the UE.

Except the HPLMNs, the PLMNs that the UE camps on are defined as VPLMNs.

Selecting from the HPLMNs

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 a PLMN, the UE searches for the PLMNs from the highest priority to the lowest.


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Roaming in the VPLMN

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

For this purpose, a value of T minutes may be stored in the SIM. Either T is in the range 6 minutes to 8 hours with a step of 6 minutes or T indicates that no periodic attempts shall be made. If no 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 must adhere to the following rules:

After the UE is switched on, a period of at least two minutes and at most T minutes shall elapse 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 the current serving VPLMN) can be compared with the priority level of a selected PLMN.

3.1.2 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 a PLMN, the UE indicates the list to the subscriber who will select a PLMN, and then camps on the 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 that belongs to the selected PLMN to camp on and to resume normal services.

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


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

To select a new PLMN, go back to position 1 in the procedure, as shown in Figure 3-1.

Table 3-1 describes the UE state involved in the cell selection.


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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 idle mode 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 to camp on.

4 Camped on any cell

The UE obtains limited services and selects a cell through cell selection or reselection. In this case, the PLMN identity is not considered.

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. For this procedure, the UE need not know in advance which Radio Frequency (RF) channels are UTRA bearers. The UE scans all RF channels in the UTRA band according to its capabilities to find a suitable cell of the selected PLMN.

On each carrier, The UE has to search for the strongest cell. Once a suitable cell is found, this cell shall be selected.

Stored information of cell selection

For this procedure, The UE has to know the central frequency information and other optional cell parameters that are obtained from the measurement control information received 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 the connected mode

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

When returning to the idle mode after an emergency call on any PLMN, the UE shall select an acceptable cell to camp on. Candidate cells for this selection are the cells used immediately before the UE leaves the connected mode.

If no acceptable cell is found, the UE shall continue to search for an acceptable cell on any PLMN in the state "Any cell selection".

Acceptable cell

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


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3.2.2 Cell Selection CriteriaThe cell selection criterion S is fulfilled when:

Srxlev > 0 and Squal > 0,

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/No (dB) for FDD cells

Applicable only to FDD cells

Qrxlevmeas Measured cell RX level value

CPICH RSCP of received signal for FDD cells (dBm).

P-CCPCH RSCP of received signal for TDD cells (dBm)

Qqualmin Qqualmin, Min quality level

Qrxlevmin Qrxlevmin, Min RX level

Pcompensation Max (UE_TXPWR_MAX_RACH – P_MAX, 0) (dB)

where

UE_TXPWR_MAX_RACH: MaxAllowedUlTxPower, Max allowed UE UL TX power.

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

3.3 Cell ReselectionThe signal strength of both serving cell and neighboring cells varies with the movement of a UE and so the UE needs to select the most suitable cell to camp on. This process is called cell reselection. Cell reselection involves three parts: cell reselection process, measurement start criteria, and cell reselection criteria.

3.3.1 Cell Reselection ProcessThe cell reselection process is as follows:

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


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Squal = Qqualmeas - Qqualmin

Srxlev = Qrxlevmeas - Qrxlevmin - Pcompensation

For detailed description of the formulas, see 3.2 Cell Selection. 3.2.1 I. Step 1Figure 3-1 shows the cell reselection of the UEs in idle mode.

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

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.

----End

3.3.2 Measurement Start CriteriaThe Hierarchical Cell Structure (HCS) may affect the measurement start criteria for cell reselection.

HCS Disabled

Figure 3-1 shows the intra-frequency, inter-frequency, and inter-RAT measurement criteria in the case when the system messages broadcast by the serving cell indicate that the HCS is disabled.

Figure 3-1 Measurement 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 to start the intra-frequency measurement.


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

Sintrasearch is set through IdleSintrasearch on the RNC side.

Inter-frequency measurement

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

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

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

Sintersearch is set through IdleSintersearch on the RNC side.

Inter-RAT measurement

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

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

− If system messages do not contain SsearchRATm, the UE always need to start the inter-RAT measurement.

SsearchRATm is set through SsearchRat on the RNC side.

HCS Disabled

Table 3-1, Table 3-2, Table 3-3, and Table 3-4 list the measurement criteria for the UE in movement when the HSC is enabled

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

Table 3-1 Intra-frequency and inter-frequency measurement criteria for the UE in slow movement

Condition Result

Srxlev ≤ SsearchHCS or Squal ≤ Sintersearch

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

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

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

SsearchHCS or Sintersearch not delivered

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

SsearchHCS is set through SsearchHCS on the RNC side.

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

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


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

Condition Result

Srxlev ≤ SsearchHCS or Squal ≤ Sintersearch All intra-frequency and inter-frequency cells are measured.

SsearchHCS or Sintersearch not delivered All intra-frequency and inter-frequency cells are measured.

Others such as Srxlev and Squal are good.

All intra-frequency and inter-frequency cells are measured with their HCS level no higher than that of the current cell.

Inter-RAT measurement criteria for UE in slow movement

Table 3-3 Inter-RAT measurement criteria for 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 of inter-RAT cells is higher than or equal to that of 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 SHCSRat on the RNC side.

Slimit,SearchRATm is set through SlimitSearchRat on the RNC side.

Inter-RAT measurement criteria for the UE in fast movement

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

Condition Result

Srxlev ≤ SHCS,RATm or Squal ≤ SSearchRATm


SHCS,RATm or SSearchRATm not delivered


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 to that of the current cell.


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3.3.3 Cell Reselection CriteriaH criterion and R criterion are used for cell reselection.

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

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

The cell-ranking criterion R is defined by:

where

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

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

The mapping between the parameters in the previous formulas and the parameters in the LMT are described in Table 3-1.

Table 3-1 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 HCS reselection

Qhysts IdleQhyst1s Hysteresis 1 for idle mode

IdleQhyst2s Hysteresis 2 for idle mode

TEMP_OFFSETn TempOffset1 HCS Cell Reselect TempOffset1

TempOffset2 HCS Cell Reselect TempOffset2

PENALTY_TIMEn TpenaltyHcsReselect HCS Cell Reselect Penalty Timer


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Figure 3-2 shows the cell reselection procedure. The procedure describes the measurement start and criteria relations. The actual procedure varies with UE implementation.

Figure 3-2 Cell reselection procedure

Firstly, the UE shall select certain cells that are ranked with reference to the S criterion in the following cases:

When HCS is not used (UseOfHcs is set to NOT_USED), the UE shall rank all cells, without considering HCS priority levels.

When HCS is used (UseOfHcs is set to USED) and UE moves slowly, the UE shall rank the cells with the highest HCSPrio among those cells that fulfill the criterion H ≥ 0.


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When HCS is used and UE moves quickly and if there are cells with a lower HCS priority than the serving cell that fulfill the criterion H ≥ 0, the UE shall rank the cells with the highest HCSPrio among those cells that fulfill the criterion H ≥0 and have a lower HCS priority than the serving cell.

When HCS is used and UE is in high mobility and if there are cells that fulfills the criterion H ≥ 0 with an HCS priority higher or equal to the HCS priority of the serving cell, the UE shall rank the cells with the lowest HCSPrio that fulfill the criterion H ≥ 0 and have an HCS priority higher or equal to the HCS priority of the serving cell.

If HCS is used but no cell fulfills the criterion H ≥ 0, the UE shall rank all cells, without considering HCS priority levels.

Secondly, the UE shall rank the cells according to the R criterion, derive Qmeas,n and Qmeas,s and calculate the R values, as described in the following cases.

The offset IdleQoffset1sn is used for Qoffsets,n to calculate Rn. The hysteresis IdleQhyst1s is 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 cell with the highest R value.

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

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

If an FDD cell is ranked as the best cell and the quality measure for cell selection and reselection is set to CPICH Ec/No(QualMeas = CPICH_ECNO), the UE shall perform a second ranking of the FDD cells according to the R criterion specified above.

In this case, however, the UE uses the measurement quantity CPICH Ec/No for deriving the Qmeas,n and Qmeas,s, and then calculating the R values of the FDD cells. The offset IdleQoffset2sn is used for Qoffsets,n to calculate Rn, and the hysteresis IdleQhyst2s is used for Qhysts to calculate Rs.

If the system information indicates that the HCS is enabled, TempOffset2 is used to calculate Ton. 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 conditions are 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 RegistrationLocation registration is used for the PLMN to trace the current status of the UE. Location registration ensures that the UE is connected to the network when the UE does not perform any operation for a long period.


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

Normal location registration

Periodic location registration

IMSI attach/detach

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

After being switched 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.

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

3.4.3 Periodic Location RegistrationPeriodic location registration may be used to periodically notify the network of the availability of the UE. It is controlled by a Periodic Location Update timer (T3212, for non-GPRS operation) or a Periodic 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 the messages ATTACH ACCEPT and ROUTING AREA UPDATE ACCEPT. The value of T3312 shall be unique within an RA.

T3212 is set through T3212 on the RNC side. T3312 is set on the CN side.

The description of the timer T3212 is as follows:

When the UE is switched on or the system information indicates that periodic location registration shall be applied, and the timer T3212 is not running. Then, the timer shall be loaded 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 location registration.

The timer T3212 shall be prevented from triggering periodic location update in connected mode. When the UE returns to the idle mode, T3212 shall be initialized 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 be prevented 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 services only.

3.4.4 IMSI Attach/DetachThe IMSI attach/detach process facilitates the fast location registration of the UE in specific conditions.

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


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The system information contains an indicator indicating whether the IMSI attach/detach operation is mandatory in the cell. The UE shall operate in accordance with the received value of 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 perform an LR request indicating IMSI attach. Otherwise, the UE shall perform an LR request indicating normal location update.

You can set the IMSI attach/detach indicator by setting ATT.

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

3.5.1 Reception ProcessWhen a UE stays in idle mode, the paging to the UE is performed within an LA or RA or the whole RNC. The UE receives the paging information from the PICH, and reads the information on the S-CCPCH.

3.5.2 Reception TechnologyTo reduce power consumption, the UE can read the information from the PICH only at a particular time. This is known as the Discontinuous Reception (DRX) technology. The interval between 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 an integer and is determined 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 description of the parameters is as follows:

CN domain specific DRX cycle lengths

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

The value is set through DRXCYCLELENCOEF on the RNC side.

UTRAN DRX cycle length

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

For a UE in idle mode, the DRX cycle length equals the shortest value of the stored DRX cycle length 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 shortest value of the following lengths:

− UTRAN DRX cycle length


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

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

3.6 Broadcast Information ReceptionUpon receipt of broadcast information, the UE obtains the network information and takes actions 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 MIB contains 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 of system information elements (IEs) with the same purpose.

When selecting a new cell, the UE reads the MIB. The UE may locate the MIB through the predefined 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 considers the content as valid, the UE will read and store the SIB.

System Information Reception

The UE shall read system information broadcast on a BCH transport channel when the UE is in idle mode or connected mode (CELL_FACH, CELL_PCH, or URA_PCH state). Then, the UE 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 their value tag. These SIBs are used when the UE returns to the cells.

When the UE selects a new cell in a new PLMN


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

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 store and use a new SIB.

3.6.2 Cell Broadcast Service ReceptionA 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 not conflict with the UE specific paging occasions.

3.6.3 MBMS ReceptionIf 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 Control Channel (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. The FACH refers to the one on which the MBMS point-to-multipoint Traffic Channel (MTCH) is mapped, and the MTCH refers to the one that carries an activated MBMS service without the need of setting up an RRC connection.

Participates in MBMS counting.

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


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Parameters

4.1 Description

Table 4-1 UE behaviors in idle mode parameter description

Parameter ID Description

T3212 Periodical location update is implemented by MS through the location update procedure. 0: The periodical update procedure is not used. This parameter is valid only when [CN domain ID] is set as CS_DOMAIN.

ATT Indicating whether attach/detach is allowed. NOT_ALLOWED indicates that MS cannot apply the IMSI attach/detach procedure. ALLOWED indicates that MS can apply the IMSI attach/detach procedure. It is valid only when [CN domain ID] is set as CS_DOMAIN.

DRXCYCLELENCOEF

CN domain specific DRX cycle length coefficient broadcast on SIB1 and used by UEs in Idle Mode.

Qqualmin The minimum required quality threshold corresponding to CPICH Ec/No. The UE can camp on the cell only when the measured CPICH Ec/No is greater than the value of this parameter. The higher the parameter value is, the more difficult it is for the UE to reside in the cell. The lower parameter value is, the easier it is for the UE to reside in the cell, but it is possible that the UE cannot receive the system messages that are sent through the PCCPCH. For detailed information, refer to the 3GPP TS 25.304.

Qrxlevmin The minimum required RX threshold corresponding to CPICH RSCP. The UE can camp on the cell only when the measured CPICH RSCP is greater than the value of this parameter. The setting of Qrxlevmin should be related to Qqualmin. The higher the parameter is, the more difficult it is for the UE to reside in the cell. The lower parameter is, the easier it is for the UE to reside in the cell, but it is possible that the UE cannot receive the system messages that are sent through the PCCPCH. For detailed information, refer to 3GPP TS 25.304.

MaxAllowedUlTxPower

The maximum allowed uplink transmits power of a UE in the cell, which is related to the network planning. For detailed information, refer to 3GPP TS 25.304.

IdleSintrasearch Threshold for intra-frequency cell reselection in idle mode. When the quality (CPICH


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Ec/No measured by the UE) of the serving cell is lower than this threshold plus the [Qqualmin] of the cell, the intra-frequency cell reselection procedure will be started. This parameter is not configured when its value is 127. The intra-frequency cell reselection has a priority higher than the inter-frequency cell reselection and inter-RAT cell reselection, the intra-frequency cell reselection start threshold should be higher than the inter-frequency cell reselection start threshold and inter-RAT cell reselection start threshold. If the cell reselection threshold is set to a comparatively high value, the UE may frequently start cell reselections, and the battery of the UE may be largely consumed. If the cell reselection threshold is set to a comparatively low value, it is difficult for cell reselections to be started, and the UE may not timely reside in the cells with good quality, affecting the quality of communication between the UTRAN and the UE. For detailed information, refer to 3GPP TS 25.304.

IdleSintersearch Threshold for inter-frequency cell reselection in idle mode. When the quality (CPICH Ec/No measured by UE) of the serving cell is lower than this threshold plus the [Qqualmin] of the cell, the inter-frequency cell reselection procedure will be started. This parameter is not configured when its value is 127. The intra-frequency cell reselection has a priority higher than the inter-frequency cell reselection and inter-RAT cell reselection, the intra-frequency cell reselection start threshold should be higher than the inter-frequency cell reselection start threshold and inter-RAT cell reselection start threshold. If the cell reselection threshold is set to a comparatively high value, the UE may frequently start cell reselections, and the battery of the UE may be largely consumed. If the cell reselection threshold is set to a comparatively low value, it is difficult for cell reselections to be started, and the UE may not timely reside in the cells with good quality, affecting the quality of communication between the UTRAN and the UE. For detailed information, refer to 3GPP TS 25.304.

SsearchRat Threshold for inter-RAT cell reselection. When the quality (CPICH Ec/No measured by UE) of the serving cell is lower than this threshold plus the [Qqualmin] of the cell, the inter-RAT cell reselection procedure will be started. This parameter is not configured when its value is 127. This parameter is not configured when its value is 127. The intra-frequency cell reselection has a priority higher than the inter-frequency cell reselection and inter-RAT cell reselection, the intra-frequency cell reselection start threshold should be higher than the inter-frequency cell reselection start threshold and inter-RAT cell reselection start threshold. If the cell reselection threshold is set to a comparatively high value, the UE may frequently start cell reselections, and the battery of the UE may be largely consumed. If the cell reselection threshold is set to a comparatively low value, it is difficult for cell reselections to be started, and the UE may not timely reside in the cells with good quality, affecting the quality of communication between the UTRAN and the UE. For detailed information, refer to 3GPP TS 25.304.

SsearchHCS Intra-system HCS cell reselection start threshold. When Srxlev of the serving cell is less than this parameter, the UE starts the intra-frequency and inter-frequency measurements so that better cells can be selected. For details, refer to 3GPP TS 25.304.

UseOfHcs Indicating whether HCS is used. For details, refer to 3GPP TS 25.304.

SHCSRat Inter-system HCS cell reselection start threshold. When Srxlev of the serving cell is less than this parameter, the UE starts the inter-system measurement so that better cells can be selected. For details, refer to 3GPP TS 25.304.

SlimitSearchRat The UE does not start the inter-RAT measurement if it detects that the quality of the serving cell is higher than this threshold. For detailed information of this parameter,


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refer to 3GPP TS 25.304.

IdleQoffset1sn Offset of cell CPICH RSCP measurement value in cell selection or reselection when the UE is in idle mode.Offset of neighboring cell CPICH measurement value. This parameter is used for RSSI measurement. The offset is subtracted from the neighboring cell measurement value before cell reselection.This parameter defines the offset of cell CPICH RSCP measurement value in cell selection or reselection when the UE is in idle mode. In cell reselection algorithm, this parameter is used for moving the border of a cell. This parameter can be configured by the network planner according to reality. NOTE: In FDD mode, this parameter is valid only when SIB11 Indicator is set as TRUE.For details, refer to 3GPP TS 25.331.As for the impact on network performance:The larger the value of the parameter, the lower the probability of selecting neighboring cells. The smaller the value the parameter, the higher the probability of doing so.

IdleQoffset2sn Offset of cell CPICH Ec/No measurement value in cell selection or reselection when the UE is in idle mode.Offset of neighboring cell CPICH measurement value This parameter is used for Ec/No measurement. The offset is subtracted from the neighboring cell measurement value before cell reselection.In cell reselection algorithm, this parameter is used for moving the border of a cell. This parameter can be configured by the network planner according to reality. NOTE: In FDD mode this parameter is valid only when SIB11 Indicator is set as TRUE.For details, refer to 3GPP TS 25.331.As for the impact on network performance:The larger the value of the parameter, the lower the probability of selecting neighboring cells. The smaller the value the parameter, the higher the probability of doing so.

QUALMEAS Measurement quantity of cell selection and reselection. It can be set to CPICH Ec/N0 or CPICH RSCP. For detailed information of this parameter, refer to 3GPP TS 25.304.

IdleQhyst1s The hysteresis value of the serving FDD cells in idle mode in case the quality measurement for cell selection and reselection is set to CPICH RSCP. It is related to the slow fading feature of the area where the cell is located. The greater the slow fading variance is, the greater this parameter. According to the R regulation, the current serving cell involves in cell selection after the measurement value is added with the hysteresis value. The measurement hysteresis aims to prevent the ping-pong effect of the cell reselection, which is caused by the slow fading when the UE is on the edge of the cell. The ping-pong effect may trigger frequent location updates (idle mode), URA updates (URA_PCH), or cell updates (CELL_FACH, CELL_PCH), and thus increase the load of network signaling and the consumption of UE batteries. Set a proper measurement hysteresis to reduce as much as possible effect of the slow fading as well as ensuring timely cell updates of the UE. According to the CPICH RSCP emulation report of inter-frequency hard handovers, the measurement hysteresis ranges 4 dBm to 5 dBm and is set to 4 dBm by default when the slow fading variance is 8 dB and the relative distance is 20 m. In the cells where the slow fading variance is low and the average moving speed of UEs is high, for example the suburbs and countryside, reduce the measurement hysteresis to guarantee timely location updates of UEs. The higher the measurement hysteresis is, the less likely it is


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for various types of cell reselections to occur, and the better the slow fading resistance capability is, but the slower the system reacts to the environment changes. For detailed information of this parameter, refer to 3GPP TS 25.304.

IdleQhyst2s The hysteresis value of the serving FDD cells in idle mode in case the quality measurement for cell selection and reselection is set to CPICH Ec/No. It is related to the slow fading feature of the area where the cell is located. The greater the slow fading variance is, the greater this parameter. It is optional. If it is not configured, [Hysteresis 1] will be adopted as the value. This parameter is not configured when its value is 255. According to the R regulation, the current serving cell involves in cell selection after the measurement value is added with the hysteresis value. The measurement hysteresis aims to prevent the ping-pong effect of the cell reselection, which is caused by the slow fading when the UE is on the edge of the cell. The ping-pong effect may trigger frequent location updates (idle mode), URA updates (URA_PCH), or cell updates (CELL_FACH, CELL_PCH), and thus increase the load of network signaling and the consumption of UE batteries. Set a proper measurement hysteresis to reduce as much as possible effect of the slow fading as well as ensuring timely cell updates of the UE. According to the CPICH RSCP emulation report of inter-frequency hard handovers, the measurement hysteresis ranges 4 dBm to 5 dBm and is set to 4 dBm by default when the slow fading variance is 8 dB and the relative distance is 20 m. In the cells where the slow fading variance is low and the average moving speed of UEs is high, for example the suburbs and countryside, reduce the measurement hysteresis to guarantee timely location updates of UEs. The higher the measurement hysteresis is, the less likely it is for various types of cell reselections to occur, and the better the slow fading resistance capability is, but the slower the system reacts to the environment changes. For detailed information of this parameter, refer to 3GPP TS 25.304.

Treselections If the signal quality (CPICH Ec/No measured by the UE) of a neighboring cell is better than that of the serving cell during the specified time of this parameter, the UE reselects the neighboring cell. It is used to avoid ping-pong reselection between different cells. Note that the value 0 corresponds to the default value defined in the protocol. Set the parameter as follows:1. Ensure that the UE can reselect a cell when crossing the non-soft-switch area of the cell and that the UE timely performs location updates, cell updates, or URA updates when necessary.2. Ensure that the UE does not reselect a cell when it is in the soft-switch area of the cell. In this way, the unnecessary location updates, cell updates, and URA updates are avoided.3. Consider the difference between cells that cover different areas, for example the cells covering highways and cells covering densely populated areas. TIf the parameter is set to a comparatively low value, the ping-pong reselections may be caused. The parameter can be increased in populated area and reduced in high-speed movement. If the parameter is set to a comparatively high value, the cell reselection delay may become excessively high, and thus cell reselections may be affected. For detailed information, refer to 3GPP TS 25.304.

HCSPrio HCS priority of the cell belongs to. The parameter depends on HCS rules. For details, refer to 3GPP TS 25.304.

Qhcs Quality threshold of HCS cell reselection. It can be used to calculate the quality level of the specified cell in HCS reselection H rules.

TpenaltyHcsResele HCS cell reselection penalty timer.


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ct The larger the value of the parameter, the longer the HCS penalty time. The smaller the value of the parameter, the shorter the HCS penalty time.

TempOffset1 Offset of HCS cell CPICH RSCP measurement value in cell selection or reselection.The larger the value of the parameter, the lower the probability of selecting neighboring cells. The smaller the value of the parameter, the higher the probability of doing so.

TempOffset2 Offset of cell CPICH Ec/No measurement value in cell selection or reselection.The larger the value of the parameter, the lower the probability of selecting neighboring cells. The smaller the value the parameter, the higher the probability of doing so.

MCC Mobile country code of the RNC.

MNC Mobile network code of the RNC.

4.2 Values and Ranges

Table 4-1 UE behaviors in idle mode parameter values and parameter ranges

Parameter ID

Default Value

GUI Value Range

Actual Value Range

Unit MML Command NE

T3212 10 0~255 0~1530 step:6 min ADD CNDOMAIN(Optional)

RNC

ATT ALLOWED NOT_ALLOWED, ALLOWED

NOT_ALLOWED, ALLOWED

None ADD CNDOMAIN(Optional)

RNC

DRXCYCLELENCOEF

6 6~9 6~9 None ADD CNDOMAIN(Optional)

RNC

Qqualmin -18(ADD CELLSELRESEL)-(ADD NRNCCELL)

-24~0 -24~0 dB ADD CELLSELRESEL(Optional)ADD NRNCCELL(Mandatory)

RNC

Qrxlevmin -58(ADD CELLSELRESEL)-(ADD NRNCCELL)

-58~-13 -115~-25, step:2

dBm ADD CELLSELRESEL(Optional)ADD NRNCCELL(Mandatory)

RNC

MaxAllowedUlTxPower

24(ADD CELLSELRESEL)-(ADD

-50~33 -50~33 dBm ADD CELLSELRESEL(Optional)ADD

RNC


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Parameter ID

Default Value

GUI Value Range

Actual Value Range

Unit MML Command NE

NRNCCELL)

NRNCCELL(Mandatory)

IdleSintrasearch

127 -16~10, 127 {-32~20}, {127}, step:2

dB ADD CELLSELRESEL(Optional)

RNC

IdleSintersearch

127 -16~10, 127 {-32~20}, {127}, step:2


RNC

SsearchRat 127 -16~10, 127 {-32~20}, {127}, step:2


RNC

SsearchHCS 0 -53~45 -105~91, step:2 dB ADD CELLHCS(Optional)

RNC

UseOfHcs NOT_USED

USED, NOT_USED

USED, NOT_USED

None ADD CELLHCS(Optional)ADD GSMCELL(Optional)ADD NRNCCELL(Optional)

RNC

SHCSRat 0 -53~45 -105~91, step:2 dB ADD CELLHCS(Optional)

RNC

SlimitSearchRat

0 -16~10 -32~20, step:2 dB ADD CELLHCS(Optional)

RNC

IdleQoffset1sn

0 -50~50 -50~50 dB ADD INTERFREQNCELL(Optional)ADD INTRAFREQNCELL(Optional)

RNC

IdleQoffset2sn

0 -50~50 -50~50 dB ADD INTERFREQNCELL(Optional)ADD INTRAFREQNCELL(Optional)

RNC

QUALMEAS

CPICH_ECNO

CPICH_ECNO(CPICH Ec/N0), CPICH_RSCP(CPICH RSCP)

CPICH_ECNO, CPICH_RSCP

None ADD CELLSELRESEL(Optional)

RNC

IdleQhyst1s 2 0~20 0~40, step:2 dB ADD CELLSELRESEL(Option

RNC


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Parameter ID

Default Value

GUI Value Range

Actual Value Range

Unit MML Command NE

al)

IdleQhyst2s - 0~20,255 {0~40}, {255}, step:2


RNC

Treselections 1 0~31 0~31 s ADD CELLSELRESEL(Optional)

RNC

HCSPrio 0 0~7 0~7 None ADD CELLHCS(Optional)ADD GSMCELL(Optional)ADD NRNCCELL(Optional)

RNC

Qhcs 20 0~99 0~99 None ADD CELLHCS(Optional)ADD GSMCELL(Optional)ADD NRNCCELL(Optional)

RNC

TpenaltyHcsReselect

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

0, 10, 20, 30, 40, 50, 60

s ADD INTRAFREQNCELL(Optional)ADD INTERFREQNCELL(Optional)ADD GSMNCELL(Optional)

RNC

TempOffset1 D3 D3, D6, D9, D12, D15, D18, D21, INFINITY

3, 6, 9, 12, 15, 18, 21, INFINITY

dB ADD INTRAFREQNCELL(Optional) ADD INTERFREQNCELL(Optional) ADD GSMNCELL(Optional)

RNC

TempOffset2 D2 D2, D3, D4, D6, D8, D10, D12, INFINITY

2, 3, 4, 6, 8, 10, 12, INFINITY

dB ADD INTRAFREQNCELL(Optional)ADD INTERFREQNCELL(Optional)

RNC

MCC - - 000~999 None SET MBMSPERF(Mandatory)

RNC

MNC - - 00~99, None SET RNC


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Parameter ID

Default Value

GUI Value Range

Actual Value Range

Unit MML Command NE

000~999 MBMSPERF(Mandatory)

The Default Value column is valid for only the optional parameters.

The "-" symbol indicates no default value.


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5 Reference Documents

The following lists the reference documents related to the feature:

1. 3GPP, TS 22.011 "Service accessibility"

2. 3GPP, TS 23.122 "NAS Functions related to Mobile Station (MS) in idle mode"

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

4. 3GPP, TS 25.304 "UE Procedures in Idle Mode and Procedures for Cell Reselection in Connected Mode"

5. 3GPP, TS 25.331 "Radio Resource Control (RRC)"

6. 3GPP, TS 31.102 "Characteristics of the USIM Application"

7. Basic Feature Description of Huawei UMTS RAN11.0 V1.5

8. Optional Feature Description of Huawei UMTS RAN11.0 V1.5


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ue in idle mode behavior pd

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