2-Owo112010 Wcdma Ue Behaviors in Idle Mode Ran10 Issue2.00

8/20/2019 2-Owo112010 Wcdma Ue Behaviors in Idle Mode Ran10 Issue2.00

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Confidential Information of Huawei. No Spreading Without Permission

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www.huawei.com

Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.

WCDMA UE Behaviorsin Idle Mode


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Page3Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.

Contents

1. PLMN Selection

2. System Information Reception

3. Cell Selection and Reselection

4. Location Registration

5. Paging Procedure

6. Access Procedure


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Contents

1. PLMN Selection




5. Paging Procedure

6. Access Procedure


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Cell Search

UE does not have UTRAN carrier information

In order to find a suitable cell to stay, UE will scan all the

frequencies in UTRAN. In each carrier, UE just need to find a cell

with best signal

UE has UTRAN carrier information

UE will try whether the original cell is suitable to stay. If not, UE

still need to scan all the frequencies about UTRAN in order to find

a suitable cell in PLMN

Typical scenario of first occasion is the first time a new UE is put into use.

The second occasion is very common.


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Cell Search

Slot synchronization

Frame synchronization and

code-group identification

Primary Scrambling code

identification

Step 1: Slot synchronization

During the first step of the cell search procedure the UE uses the primary synchronisation code (PSC)

to acquire slot synchronisation to a cell. Step 2: Frame synchronization and code-group identification

During the second step of the cell search procedure, the UE uses the secondary synchronisation

code (SSC) to find frame synchronisation and identify the code group of the cell found in the first

step.

Step 3: Primary Scrambling code identification:

During the last step of the cell search procedure, the UE determines the exact primary scrambling

code used by the found cell. The primary scrambling code is typically identified through symbol-by-

symbol correlation over the CPICH with all codes within the code group identified in the second

step.

If the UE has received information about which scrambling codes to search for, steps 2 and 3 abovecan be simplified.


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PLMN Selection

UE shall maintain a list of allowed PLMN types. In the PLMN list,

the UE arranges available PLMNs by priorities. When selecting a

PLMN, it searches the PLMNs from the high priority to the low.

The UE selects a PLMN from HPLMNs or VPLMNs.

UE can get the system information from PCCPCH, and the PLMN information is transmitted in MIB

of PCCPCH

After getting the MIB, UE can judge weather the current PLMN is the right one. If so, UE will getthe SIB scheduling information from the MIB; if not, UE will search another carrier, do this

procedure again


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PLMN Selection (Cont.)

Automatic PLMN Selection Mode

The UE selects an available and suitable PLMN from the whole

band according to the priority order

If a UE is in a VPLMN, it scans the “user controlled PLMN selector”

field or the “operator controlled PLMN selector” field in the PLMN

list to find the HPLMN or the PLMN with higher priority according

to the requirement of the automatic PLMN selection mode.

Manual PLMN Selection Mode

UE shows all the PLMN, and subscriber can select PLMN manually.

The priority order for automatic PLMN selection mode

A value of T minutes may be stored in the SIM. T is either in the range from 6 minutes to 8 hours in

6-minute steps or it indicates that no periodic attempts shall be made. If no value is stored in the

SIM, a default value of 60 minutes is used.

If the UE is in a VPLMN, after the UE is switched on, a period of at least 2 minutes and at most Tminutes shall elapse before the first attempt is made. The UE shall make an attempt if the UE is on

the VPLMN at time T after the last attempt.

The PLMN selected by the

UE before automatic PLMN

selection

Previously selected PLMN6

The PLMNs are arranged in

descending order of signal

quality.

Other PLMN/access technology combinations

excluding the previously selected PLMN5


random order

Other PLMN/access technology combinations with

the high quality of received signals excluding the

previously selected PLMN

4


priority order

PLMNs contained in the "Operator Controlled

PLMN Selector with Access Technology" data field

in the SIM excluding the previously selected PLMN

3


priority order

PLMNs contained in the "User Controlled PLMN

Selector with Access Technology" data field in the

SIM excluding the previously selected PLMN

2

Home PLMNsHPLMNs1

RemarkPLMN typeOrder


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Contents

1. PLMN Selection




5. Paging Procedure

6. Access Procedure


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Structure of System Information

System information is organized as a tree, including:

MIB (Master Information Block )

SB (Scheduling Block )

SIB (System Information Block )

System information is used for the network to broadcast network information to UEs camping on a

cell so as to control the behavior of UEs.

MIB When selecting a new cell, the UE reads the MIB. The UE may locate the MIB by predefined

scheduling information. The IEs in the MIB includes MIB value tag, PLMN type, PLMN

identity, reference and scheduling information for a number of SIBs in a cell or one or two

SBs in a cell.

SB

Scheduling Block (SB) gives reference and scheduling information to other SIBs. The

scheduling information of a SIB may be included in only one of MIB and SB.

SIB

System Information Block (SIB) contains actual system information. It consists of system

information elements (IEs) with the same purpose. Scheduling information for a system information block may only be included in either the master

information block or one of the scheduling blocks.


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System Information

SIB1: Contains the system information for NAS and the timer/counterfor UE

SIB2: Contains the URA information

SIB3: Contains the parameters for cell selection and cell re-selection

SIB5: Contains parameters for the common physical channels of the

cell

SIB7: Contains the uplink interference level and the refreshing timer

for SIB7

SIB11: Contains measurement controlling information

SIB4: Contains parameters for cell selection and cell re-selection while UE is in connected mode

SIB6: Contains parameters for the common physical channels of the cell while UE is in connected

mode SIB8: Contains the CPCH static information

SIB9: Contains the CPCH dynamic information

SIB10: Contains information to be used by UEs having their DCH controlled by a DRAC procedure.

Used in FDD mode only. To be used in CELL_DCH state only. Changes so often, its decoding is

controlled by a timer

SIB12: Contains measurement controlling information in connecting mode

SIB13: Contains ANSI-41 system information

SIB14: Contains the information in TDD mode

SIB15: Contains the position service information

SIB16: Contains the needed pre-configuration information for handover from other RAT to UTRAN

SIB17: Contains the configuration information for TDD

SIB18: Contains the PLMN identities of the neighboring cells

To be used in shared networks to help with the cell reselection process


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Reception of System Information

The UE shall read system information broadcast on a BCH

transport channel when the UE is in idle mode or in connected

mode, that is, in CELL_FACH, CELL_PCH, or URA_PCH state.

The UE may use the scheduling information in MIB and SB to locate each SIB to be acquired. If the

UE receives a SIB in a position according to the scheduling information and consider the content

valid, it will read and store it.


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Contents

1. PLMN Selection




5. Paging Procedure

6. Access Procedure


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Cell Selection

When the PLMN is selected and the UE is in idle mode, the UE

starts to select a cell to camp on and to obtain services.

There are four states involved in cell selection:

Camped normally

Any cell selection

Camped on any cell

Connected mode

Camped normally: The cell that UE camps on is called the suitable cell. In this state, the UE obtains

normal service.

Any cell selection: In this state, the UE shall attempt to find an acceptable cell of an any PLMN tocamp on, trying all RATs that are supported by the UE and searching first for a high quality cell

Camped on any cell: The cell that UE camps on is called the acceptable cell. In this state the UE

obtains limited service. The UE shall regularly attempt to find a suitable cell of the selected PLMN,

trying all RATs that are supported by the UE.

Connected mode: When returning to idle mode, the UE shall use the procedure Cell selection when

leaving connected mode in order to find a suitable cell to camp on and enter state Camped

normally. If no suitable cell is found in cell reselection evaluation process, the UE enters the state

Any cell selection.


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Cell Selection (Cont.)

Two types of cell selection:

Initial cell selection

If no cell information is stored for the PLMN, the UE starts this procedure.

Stored information cell selection

If cell information is stored for the PLMN, the UE starts this procedure.

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 itscapabilities to find a suitable cell of the selected PLMN. On each carrier, the UE need only 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 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 it finds one. Otherwise, the "Initial cell selection" procedure is triggered.


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Cell Selection Criteria

minqualqualmeasqual QQS −=

oncompensatirxlevrxlevmeasrxlev PQQS −−= min

Criterion S is used by the UE to judge whether the cell is

suitable to camped on.

Criterion S : Srxlev > 0 & Squal > 0, where:

If the pilot strength and quality of one cell meet S criteria, UE will stay in this cell and get other

system information. Then, UE will initiate a location update registration process.

If the cell doesn’t satisfy S criteria, UE will get adjacent cells information from SIB11. Then, UE will judge weather these cells satisfy S criteria. If the adjacent cell is suitable, UE will stay in the adjacent

cell.

If no cell satisfies S criteria, UE will take the area as dead zone and continue the PLMN selection and

reselection procedure.

Max（UE_TXPWR_MAX_RACH-P_MAX，0）, dBmPcompensation

Maximum TX power level an UE may use when accessing the cell on RACH

(read in system information) (dBm)

UE_TXPWR_M

AX_RACH

Maximum RF output power of the UE (dBm)P_MAX

Minimum required RX level in the cell (dBm)Qrxlevmin

Minimum required quality level in the cell (dB)Qqualmin

Measured cell RX level value. This is received signal, CPICH RSCP for current

cells (dBm)

Qrxlevmeas

Measured cell quality value. The quality of the received signal expressed in

CPICH Ec/N0 (dB) for current cell

Qqualmeas

Cell RX level value (dBm) Srxlev

Cell quality value (dB) Squal

ExplanationParameters


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Parameters of S Criterion

QQUALMIN

Parameter name: Min quality level

Recommended value: -18, namely -18dB

QRXLEVMIN

Parameter name: Min Rx level

Recommended value: -58, namely -115dBm

QQUALMIN

Parameter name: Min quality level

Value range: -24~0 Physical value range: -24~0; step: 1

Physical unit: dB

Content: The minimum required quality level 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.

Recommended value: -18

Set this parameter through ADD CELLSELRESEL, query it through LST CELLSELRESEL, and

modify it through MOD CELLSELRESEL.

QRXLEVMIN

Parameter name: Min Rx level

Value range: -58~-13.

Physical value range: -115~-25; step: 2 (-58:-115; -57:-113; ..., -13:-25 ).

Physical unit: dBm.

Content: The minimum required RX level 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.

Recommended value: -58.




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Parameters of S Criterion

MAXALLOWEDULTXPOWER

Parameter name: Max allowed UE UL TX power

Recommended value: 24, namely 24dBm

MAXALLOWEDULTXPOWER

Parameter name: Max allowed UE UL TX power

Value range: -50~33 Physical value range: -50~33; step: 1

Physical unit: dBm

Content: The maximum allowed uplink transmit power of a UE in the cell, which is related

to the network planning. Content: Allowed maximum power transmitted on RACH in the

cell. It is related to network planning.

Recommended value: 24




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Cell Reselection

After selecting a cell and camping on it, the UE periodically

searches for a better cell according to the cell reselection

criteria. If finding such a cell, the UE selects this cell to camp on.

QUALMEAS

Parameter name: Cell Se-reselection quality measure

Recommended value: CPICH_ECNO

UE should monitor the quality of current cell and neighbor cells in order to camp on the better cell

to initiate service. The better cell is the most suitable one for the UE to camp on and obtain services.

The QoS of this cell is not necessarily more satisfying.

QUALMEAS

Parameter name: Cell Sel-reselection quality measure

Value range: CPICH_ECNO(CPICH Ec/N0),CPICH_RSCP(CPICH RSCP)

Physical unit: None.

Content: Cell selection and reselection quality measure, may be set to CPICH Ec/N0 or

CPICH RSCP.

Recommended value: CPICH_ECNO.


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Measurement Start Criteria (Cont.)

Intra-frequency measurement

Squal ≤ Sintrasearch

↓

Qqualmeas − Qqualmin ≤ Sintrasearch

↓

Qqualmeas ≤ Qqualmin + Sintrasearch

Parameters of the measurement start criteria

Minimum required quality level in the cell (dB) .Qqualmin

Measurement threshold for UE to trigger inter-RAT cell reselection, comparedwith S

qual

.SsearchRATm

Measurement threshold for UE to trigger inter-frequency cell reselection,compared with Squal.

Sintersearch

Measurement threshold for UE to trigger intra-frequency cell reselection,compared with Squal.

Sintrasearch

Cell quality value (dB)Squal

DescriptionName


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Inter-frequency measurement

Squal ≤ Sintersearch

↓

Qqualmeas − Qqualmin ≤ Sintersearch

↓

Qqualmeas ≤ Qqualmin + Sintersearch




qual

.SsearchRATm


Sintersearch


Sintrasearch


DescriptionName


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Inter-RAT measurement

Squal ≤ SsearchRATm

↓

Qqualmeas − Qqualmin ≤ SsearchRATm

↓

Qqualmeas ≤ Qqualmin + SsearchRATm




qual

.SsearchRATm


Sintersearch


Sintrasearch


DescriptionName


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Parameters of Measurement Start Criteria

IDLESINTRASEARCH

Parameter name: Intra-freq cell reselection threshold for idle mode

Recommended value: None

CONNSINTRASEARCH

Parameter name: Intra-freq cell reselection threshold for

connected mode


IDLESINTRASEARCH

Parameter name: Intra-freq cell reselection threshold for idle mode

Value range: {{-16~10},{127}} . Physical value range: -32~20; step: 2.

Physical unit: dB.

Content: A threshold for intra-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 intra-frequency cell reselection procedure will be started.

Recommended value: None.



CONNSINTRASEARCH

Parameter name: Intra-freq cell reselection threshold for connected mode

Value range: {{-16~10},{127}} .

Physical value range: -32~20; step: 2.

Physical unit: dB

Content: A threshold for intra-frequency cell reselection in connect mode. When the quality


[Qqualmin] of the cell, the intra-frequency cell reselection procedure will be started.





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IDLESINTERSEARCH

Parameter name: Inter-freq cell reselection threshold for idle mode


CONNSINTERSEARCH

Parameter name: Inter-freq cell reselection threshold for

connected mode


IDLESINTERSEARCH

Parameter name: Inter-freq cell reselection threshold for idle mode


Physical unit: dB.

Content: A threshold for inter-frequency cell reselection in idle mode. When the quality


[Qqualmin] of the cell, the inter-frequency cell reselection procedure will be started.




CONNSINTERSEARCH

Parameter name: Inter-freq cell reselection threshold for connected mode

Value range: {{-16~10},{127}} .

Physical value range: -32~20; step: 2.

Physical unit: dB

Content: A threshold for inter-frequency cell reselection in connect mode. When the quality


[Qqualmin] of the cell, the inter-frequency cell reselection procedure will be started.





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SSEARCHRAT

Parameter name: Inter-RAT cell reselection threshold


SSEARCHRAT

Parameter name: Inter-RAT cell reselection threshold


Physical unit: dB.

Content: A 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.





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Measurement Start Criteria Description

The intra-frequency, inter-frequency, and inter-RAT measurement criteria are as shown in the figure.

Usually, Sintrasearch > Sintersearch > SsearchRATm


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Cell Reselection Criteria

Criterion R is used for intra-frequency, inter-frequency cells and

inter-RAT cell reselection.

The cell-ranking criterion R is defined by :

nsoffset nmeasn QQ R

,, −=

hystssmeass QQ R += ,

The cells are ranked according to R criteria specified above ,deriving QQmeas,nmeas,n and QQmeas,smeas,s and

calculating R value.

In Rs, s means serving cell. In Rn, n means neighbor cell. The offset Qoffset1s,n is used for Qoffsets,n to calculate Rn. The hysteresis Qhyst1s is used for

Qhysts to calculate Rs.

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, 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/N0, 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 the Qmeas,n

and Qmeas,s and then calculating the R values of the FDD cells. The offset Qoffset2s,n is used forQoffsets,n to calculate Rn, the hysteresis Qhyst2s is used for Qhysts to calculate Rs.


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Hysteresis and Time Interval

TimeTreselection

Quality

Rn

Rs

Qmeas,n

Qmeas,s

Qhyst,s

Qoffsets,n

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 Treselection.

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


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Parameters of R Criteria (Cont.)

IDLEQHYST2S

Parameter name: Hysteresis 2 for idle mode

Recommended value: Qhyst1s for idle mode

CONNQHYST2S

Parameter name: Hysteresis 2 for connected mode

Recommended value: Qhyst1s for connected mode.

IDLEQHYST2S

Parameter name: Hysteresis 2 for idle mode

Value range: {{0~20},{255}} .

Physical value range: 0~40; step: 2.

Physical unit: dB.

Content: The hysteresis value in idle mode for serving FDD cells 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.

Recommended value: Qhyst1s for idle mode .

Set this parameter through ADD CELLSELRESEL, query it through LST CELLSELRESEL, and modify it

through MOD CELLSELRESEL.

CONNQHYST2S

Parameter name: Hysteresis 2 for connected mode

Value range: {{0~20},{255}} .

Physical value range: 0~40; step: 2.

Physical unit: dB.

Content: The hysteresis value in connect mode for serving FDD cells 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.

Recommended value: Qhyst1s for connected mode. .

Set this parameter through ADD CELLSELRESEL, query it through LST CELLSELRESEL, and modify it

through MOD CELLSELRESEL.


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TRESELECTIONS

Parameter name: Reselection delay time

Recommended value: 1, namely 1s.

TRESELECTIONS

Parameter name: Reselection delay time

Value range: 0~31 . Physical value range: 0~31; step: 1.

Physical unit: s.

Content: If the signal quality of a neighboring cell is better than the serving cell during the

specified time of this parameter, the UE will reselect the neighboring cell. It is used to avoid

ping-pong reselection between different cells. Note: The value 0 corresponds to the default

value defined in the protocol.

Recommended value: 1.




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IDLEQOFFSET1SN

Parameter name: IdleQoffset1sn

Recommended value: 0, namely 0dB.

CONNQOFFSET1SN

Parameter name: ConnQoffset1sn


IDLEQOFFSET1SN


Offset of cell CPICH RSCP measurement value in cell selection or reselection when the UE is in idle

mode

Value range: -50 to +50 .

Physical value range: -50 to +50; step: 1.

Physical unit: dB.

Content: This parameter is used for moving the border of a cell. The larger the value of this

parameter, the lower the probability of neighboring cell selection.


Set this parameter through ADD INTRAFREQNCELL / ADD INTERFREQNCELL, query it through LST

INTRAFREQNCELL / LST INTERFREQNCELL, and modify it through MOD INTRAFREQNCELL / MOD

INTERFREQNCELL.

CONNQOFFSET1SN


Offset of cell CPICH RSCP measurement value in cell selection or reselection when the UE is in

connected mode


Physical value range: -50 to +50 ; step: 1.

Physical unit: dB.






INTERFREQNCELL.


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IDLEQOFFSET2SN



CONNQOFFSET2SN



IDLEQOFFSET2SN


Offset of cell CPICH Ec/No measurement value in cell selection or reselection when the UE is in idle

mode


Physical value range: -50 to +50; step: 1.

Physical unit: dB.






INTERFREQNCELL.

CONNQOFFSET2SN


Offset of cell CPICH RSCP measurement value in cell selection or reselection when the UE is in

connected mode


Physical value range: -50 to +50 ; step: 1.

Physical unit: dB.






INTERFREQNCELL.


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Contents

1. PLMN Selection




5. Paging Procedure

6. Access Procedure


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Location Registration

The location registration includes:

Location update (for non-GPRS)

Route update (for GPRS)

The location registration is used for the PLMN to trace the current status of the UE and to ensure

that the UE is connected with the network when the UE does not perform any operation for a long

period.


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Periodic Location Registration

Periodic location registration is controlled by a Periodic

Location Update timer (T3212) or a Periodic Routing Area

Update timer (T3312)

Periodic location registration may be used to periodically notify the network of the availability of the

UE.

T3212 is for non-GPRS operation T3312 is for GPRS operation


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Parameters of Location Registration

T3212

Parameter name: Periodical location update timer [6min]

Recommended value: 10, namely 60min

ATT

Parameter name: Attach/detach indication

Recommended value: ALLOWED

T3212

Parameter name: Periodical location update timer [6min]

Value range: 0~255. Physical unit: 6 min.

Content: This parameter indicates the time length of the periodical location update.

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.


Set this parameter through ADD CNDOMAIN, query it through LST CNDOMAIN, modify it

through MOD CNDOMAIN.

ATT

Parameter name: Attach/detach indication Value range: NOT_ALLOWED, ALLOWED .

Content: NOT_ALLOWED indicates that MS cannot apply the IMSI attach/detach procedure.

ALLOWED indicates that MS can apply the IMSI attach/detach procedure. This parameter is

valid only when [CN domain ID] is set as CS_DOMAIN.

Recommended value: ALLOWED.

Set this parameter through ADD CNDOMAIN, query it through LST CNDOMAIN, modify it

through MOD CNDOMAIN.


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Contents

1. PLMN Selection




5. Paging Procedure

6. Access Procedure


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Paging Initiation

CN initiated paging

Establish a signaling connection

UTRAN initiated paging

Trigger the cell update procedure

Trigger reading of updated system information

For CN originated paging:

In order to request UTRAN connect to UE, CN initiates the paging procedure, transmits

paging message to the UTRAN through Iu interface, and UTRAN transmits the pagingmessage from CN to UE through the paging procedure on Uu interface, which will make

the UE initiate a signaling connection setup process with the CN.

For UTRAN originated paging:

When the cell system message is updated: When system messages change, the UTRAN will

trigger paging process in order to inform UE in the idle, CELL_PCH or URA_PCH state to

carry out the system message update, so that the UE can read the updated system message.

UE state transition: In order to trigger UE in the CELL_PCH or URA_PCH state to carry out

state transition (for example, transition to the CELL_FACH state), the UTRAN will perform a

paging process. Meanwhile, the UE will initiate a cell update or URA update process, as a

reply to the paging.


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Paging Type 1

If UE is in CELL_PCH,URA_PCH or IDLE state，the paging

message will be transmitted on PCCH with paging type 1

CN RNC1 RNC2 NODEB1.1 NODEB2.1 UE

RANAPRANAP

RANAP RANAP

PCCH: PAGING TYPE 1

PAGING

PAGING

PCCH: PAGING TYPE 1

Paging type 1:

The message is transmitted in one LA or RA according to LAI or RAI.

After calculating the paging time, the paging message will be transmitted at that time If UE is in CELL_PCH or URA_PCH state, the UTRAN transmits the paging information in

PAGING TYPE 1 message to UE. After received paging message, UE performs a cell update

procedure to transit state to CELL_FACH.

As shown in the above figure, the CN initiates paging in a location area (LA), which is covered by

two RNCs. After receiving a paging message, the RNC searches all the cells corresponding to the LAI,

and then calculates the paging time, at which it will send the PAGING TYPE 1 message to these cells

through the PCCH.


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Paging Type 2

If UE is in CELL_DCH or CELL_FACH state，the paging message

will be transmitted on DCCH with paging type 2

CN SRNC UE

RANAPRANAP

PAGING

RRCRRC

DCCH: PAGING TYPE 2

Paging type 2:

If UE is in CELL_DCH or CELL_FACH state，the paging message will be transmitted on

DCCH with paging type 2 The message will be only transmitted in a cell

As shown in the above figure, if the UE is in the CELL_-DCH or CELL_FACH state, the UTRAN will

immediately transmit PAGING TYPE 2 message to the paged UE on DCCH channel.


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Typical Call Flow of UE UE NAS UE AS NS S MS C

paging

AU TH EN TIC AT IO N RE QU ES T

AU TH EN TIC AT IO N RE SP ON SE

RR_SECURITY_CONTROL_REQ

(IK CK)

Security mode control

SETUP

CALL CONFIRM

AL ER T

CONNECT

CONNECT ACKNOWLEDGE

RAB setup process

paging

RR_EST_REQ (PAGING RESPONSE)

RR_PAING_IND

INITIAL_DIRECT_TRANSFER

(PAGING RESPONSE)

RANAPRANAP

RRC setup process

Many problems will cause the target UE cannot receive the paging message properly

Power setting of paging channel is unreasonable.

Unreasonable paging strategies will result in paging channel congestion, which can causepaging message loss.

Paging parameter is unreasonable

Equipment fault


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DRX Procedure

UE receives the paging indicator on PICH periodically, that is

the Discontinuous Reception (DRX)

The value for the DRX paging cycle length is determined as

follows: :

DRX Cycle Length＝ MAX (2k, PBP) frames

In idle mode, the UE can monitor the paging in two modes: one is to decode SCCPCH directly every

10ms, the other is to decode the PICH periodically. The second one is the DRX, which is

Discontinuous Reception Mechanism. The paging period formula:

DRX Cycle Length＝ MAX(2k, PBP) frames

K is the “CN domain specific DRX cycle length coefficient”, which is broadcasted in SIB1.

The typical value is 6.

PBP is Paging Block Periodicity , which is 1 for FDD mode

The paging period should be 640ms if K is 6


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DRX Procedure (Cont.)

Through DRX, UE only listens to PICH at certain predefined time.

And UE will read the paging information on SCCPCH if the

paging indicator is 1.

The value of the Paging Occasion is determined as follows:

Paging Occasion (CELL SFN) =

{(IMSI div K) mod (DRX cycle length div PBP)} * PBP

+ n * DRX cycle length + Frame Offset

Paging SFN formula:

Paging Occasion (CELL SFN) = {(IMSI mod K) mod (DRX cycle length div PBP)} *PBP + n

*DRX cycle length + Frame Offset n =0, 1, 2……and the requirement is the calculated CELL SFN must be below its maximum

value 4096

Frame Offset is 0 for FDD mode

K is the number of SCCPCH which carries PCH, and the typical value is 1

The formula cloud be simplified as: SFN = IMSI mod (2^K) + n * (2^K)


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In FDD the UE shall monitor its paging indicator in the PICH

frame with SFN given by the Paging Occasion

The Page Indicator to use is calculated by using the following

formula:

PI = (IMSI div 8192) mod NP

SFN is the paging occasion of the UE

As shown in the followed figure, the UE needs to monitor the frames (paging occasions) indicated

by the red dots, and then decodes the qth PI of this frame. (The qth PI is obtained based on theabove formula).

If the UE has no IMSI, for instance when making an emergency call without USIM, the UE shall use

as default numbers, IMSI = 0 and DRX cycle length = 256 (2.56 s), in the formulas above.

。。。

0

2^K-1

04095

。。。

P I P I P I P I。。。。。。

0 1 q NP-1

One DRX cycle


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τPICH

Associated S-CCPCH frame

PICH frame containing paging indicator

Time offset between PICH and S-CCPCH

The timing relationship between PICH and S-CCPCH is defined by the above figure, and the

interval is 3 slots duration (2ms, 7680 chips).


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Parameters of DRX

DRXCYCLELENCOEF

Parameter name: DRX cycle length coefficient


PICHMODE

Parameter name: PICH mode

Recommended value: V36.

DRXCYCLELENCOEF

Parameter name: DRX cycle length coefficient

Value range: 6~9 . Content: This parameter is broadcasted on SIB1. This parameter is used when a UE is in idle

mode.


Set this parameter through ADD CNDOMAIN, query it through LST CNDOMAIN, and

modify it through MOD CNDOMAIN.

PICHMODE

Parameter name: PICH mode

Value range: V18, V36, V72, V144 .

Physical value range: 18, 36, 72, 144 .

Content: Indicating the number of PIs contained in each frame on the PICH.

Recommended value: V36 .

Set this parameter through ADD PICH, query it through LST PICH.


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Parameters of DRX

MACCPAGEREPEAT

Parameter name: Number of page re-TX


MACCPAGEREPEAT

Parameter name: Number of page re-TX

Number of retransmissions of paging message Value range: 0~2 .

Content: If the number of retransmissions of paging message exceeds this parameter value,

retransmissions stop.


Set this parameter through SET DPUCFGDATA, query it through LST DPUCFGDATA.


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Contents

1. PLMN Selection




5. Paging Procedure

6. Access Procedure


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Two Working Mode of UE

Idle mode

After turning on, UE will stay in idle mode

Connected mode

UE will switch to connected mode which could be CELL_FACH

state or CELL_DCH state from the idle mode

After releasing RRC connection, UE will switch to the idle mode

from the connected mode

The most important difference between idle mode and connected mode is whether UE has RRC

connection with UTRAN or not.

In idle mode, UE will be identified by IMSI, TMSI or PTMSI and so on. In connected mode, UE will be identified by URNTI (UTRAN Radio Network Temporary Identity),

which is the ID of one RRC connection.


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Random Access Procedure

Definition

Random access procedure is initiated by UE in order to get service

from the system. Meanwhile, the access channels are allocated to

the UE by system

This process may happen in the following scenarios:

Attach and detach

LA update and RA update Signaling connection for services


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Random Access Channel

AICH accessslots

10 ms

#0 #1 #2 #3 #14#13#12#11#10#9#8#7#6#5#4τp-a

#0 #1 #2 #3 #14#13#12#11#10#9#8#7#6#5#4

PRACHaccess slots

SFN mod 2 = 0 SFN mod 2 = 1

10 ms

Access slot set 1 Access slot set 2

Definition

UE will transmit the preamble at the access time slot

Each 20ms access frame is composed of two 10ms radio frames, which is divided into 15 access

time slot, and 5120 chips for each slot The PRACH access slots, AICH access slots and their time offset are showed in the above figure


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RACH Sub-Channels

1413121110987

210765436

1413121110985

543210764

8141312111093

765432102

1110981413121

765432100

11109876543210

Random access sub-channels numberSFN mod8

The access slots of different RACH sub-channels are illustrated by thefollowing table

A RACH sub-channel defines a sub-set of the total set of uplink access slots. There are a total of 12

RACH sub-channels.


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Access Service Class

The PRACH resources can be classified into several ASCs, so as

to provide RACH applications with different priorities.

For Frequency Division Duplex (FDD) mode, the PRACH resources include access timeslots and

preamble signatures, which can be classified into several ASCs, so as to provide RACH applications

with different priorities. The ASCs range from 0 to 7, and the quantity of ASCs is 8. "0" indicates the highest priority and "7"

indicates the lowest priority.

The system will assign random access sub-channels and signatures according to the ASC (Access

Service Class ) of UE.

Set ASC of PRACH through ADD PRACHASC, modify it through MOD PRACHASC, and remove it

through RMV PRACHASC.


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Access Control

“Access Control” is used by network operators to prevent

overload of radio access channels under critical conditions.

Access class 0~Access Class 9

Access class 11~Access Class 15

Access class 10

The access class number is stored in the SIM/USIM.

Access class 0~9 are allocated to all the users. And the 10 classes show the same priority.

Access class 11~15 are allocated to specific high priority users as follows. (The enumeration is notmeant as a priority sequence):

Access class 15: PLMN staff

Access class 14: users subscribing to emergency services

Access class 13: public organizations

Access class 12: users subscribing to security services

Access class 11: users responsible for PLMN management

Access Class 10 indicates whether or not network access for Emergency Calls is allowed for UEs

with access classes 0 to 9 or without an IMSI. For UEs with access classes 11 to 15, Emergency Calls

are not allowed if both "Access class 10" and the relevant Access Class (11 to 15) are barred.

Otherwise, Emergency Calls are allowed.


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START

Choose a RACH sub channel from

available ones

Get available signatures

Set Preamble Retrans Max

Set Preamble_Initial_Power

Send a preamble

Check the corresponding AI

Increase message part power by

p-m based on preamble power

Set phys ical status to be RACH

message transmitted Set phys ical status to be Nackon AICH received

Choose a access slot again

Counter> 0 & Preamble

power-maximum allowed power


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Physical random access procedure

1. Derive the available uplink access slots, in the next full access slot set, for the set of

available RACH sub-channels within the given ASC. Randomly select one access slot among

the ones previously determined. If there is no access slot available in the selected set,

randomly select one uplink access slot corresponding to the set of available RACH sub-channels within the given ASC from the next access slot set. The random function shall be

such that each of the allowed selections is chosen with equal probability

2. Randomly select a signature from the set of available signatures within the given ASC

3. Set the Preamble Retransmission Counter to Preamble_ Retrans_ Max

4. Set the parameter Commanded Preamble Power to Preamble_Initial_Power

5. Transmit a preamble using the selected uplink access slot, signature, and preamble

transmission power

6. If no positive or negative acquisition indicator (AI ≠ +1 nor –1) corresponding to the

selected signature is detected in the downlink access slot corresponding to the selected

uplink access slot: A: Select the next available access slot in the set of available RACH sub-channels

within the given ASC

B: select a signature

C: Increase the Commanded Preamble Power

D: Decrease the Preamble Retransmission Counter by one. If the Preamble

Retransmission Counter > 0 then repeat from step 6. Otherwise exit the physical

random access procedure

7. If a negative acquisition indicator corresponding to the selected signature is detected in

the downlink access slot corresponding to the selected uplink access slot, exit the physical

random access procedure Signature 8. If a positive acquisition indicator corresponding to the selected signature is detected ,

Transmit the random access message three or four uplink access slots after the uplink

access slot of the last transmitted preamble

9. Exit the physical random access procedure


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UE Timers and Constants in Idle Mode

T300

Parameter name: Timer 300 [ms]

Recommended value: D2000, namely 2000ms

N300

Parameter name: Constant 300


T300

Parameter name: Timer 300[ms]

Value range: D100, D200, D400, D600, D800, D1000, D1200, D1400, D1600, D1800,D2000, D3000, D4000, D6000, D8000 .

Physical value range: 100, 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000, 3000,

4000, 6000, 8000

Physical unit: ms

Content: T300 is started after the UE transmits the RRC CONNECTION REQUEST message

and stopped after the UE receives the RRC CONNECTION SETUP message. RRC

CONNECTION REQUEST resents upon the expiry of the timer if V300 less than or equal to

N300. Otherwise, the UE enters idle mode.

Recommended value: D2000.

Set this parameter through SET IDLEMODETIMER, query it through LST IDLEMODETIMER. N300


Value range: 0~7 .

Content: Maximum number of retransmission of RRC CONNECTION REQUEST .


Set this parameter through SET IDLEMODETIMER, query it through LST IDLEMODETIMER.


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UE Timers and Constants in Idle Mode

T312

Parameter name: Timer 312 [s]

Recommended value: 6, namely 6s

N312


Recommended value: D1, namely 1

T312

Parameter name: Timer 312[s]

Value range: 1~15 . Physical value range: 1~15s

Physical unit: s

Content: T312 is started after the UE starts to establish a DCH and stopped when the UE

detects N312 consecutive "in sync" indications from L1. It indicates physical channel setup

failure upon the expiry of the timer.



N312


Value range: D1, D2, D4, D10, D20, D50, D100, D200, D400, D600, D800, D1000 .

Physical value range: 1, 2, 4, 10, 20, 50, 100, 200, 400, 600, 800, 1000

Content: Maximum number of consecutive "in sync" indications received from L1. .

Recommended value: D1.



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RRC Connection Establish Channel Typeand Bit Rate

RRCCAUSE

Parameter name: Cause of RRC connection establishment

Recommended value: none

SIGCHTYPE

Parameter name: Channel type for RRC establishment

Recommended value: none

RRCCAUSE

Parameter name: Cause of RRC connection establishment

Value range: ORIGCONVCALLEST, ORIGSTREAMCALLEST, ORIGINTERCALLEST,ORIGBKGCALLEST, ORIGSUBSTRAFFCALLEST, TERMCONVCALLEST, TERMSTREAMCALLEST,

TERMINTERCALLEST, TERMBKGCALLEST, EMERGCALLEST, INTERRATCELLRESELEST,

INTERRATCELLCHGORDEREST, REGISTEST, DETACHEST, ORIGHIGHPRIORSIGEST,

ORIGLOWPRIORSIGEST, CALLREEST, TERMHIGHPRIORSIGEST, TERMLOWPRIORSIGEST,

TERMCAUSEUNKNOWN, DEFAULTEST.

Content: The cause of Rrc connection establishment. .

Recommended value: none.

Set this parameter through SET RRCESTCAUSE, query it through LST RRCESTCAUSE.

SIGCHTYPE

Parameter name: Channel type for RRC establishment Value range: FACH, DCH_3.4K_SIGNALLING, DCH_13.6K_SIGNALLING.

Content: FACH indicates that the RRC is established on the common channel.

DCH_3.4K_SIGNALLING indicates that the RRC is established on the dedicated channel of

3.4 kbit/s. DCH_13.6K_SIGNALLING indicates that the RRC is established on the dedicated

channel of 13.6 kbit/s. .

Recommended value: none.



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RRC Connection Establish Channel Typeand Bit Rate

INTRAMEASCTRL

Parameter name: IntraMeas Ctrl Ind for RRC establishment

Recommended value: SUPPORT

INTRAMEASCTRL

Parameter name: IntraMeas Ctrl Ind for RRC establishment

Value range: NOT_SUPPORT, SUPPORT. Content: NOT_SUPPORT indicates that the Intrafreq measurement control message will be

send in RRC Connection Establishment. SUPPORT indicates that the Intrafreq measurement

control will not be send in RRC Connection Establishment.

Recommended value: SUPPORT .



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2-Owo112010 Wcdma Ue Behaviors in Idle Mode Ran10 Issue2.00

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