OWO115010 WCDMA RAN13 UE Behaviors in Idle Mode ISSUE1.pdf

8/14/2019 OWO115010 WCDMA RAN13 UE Behaviors in Idle Mode ISSUE1.pdf

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WCDMA UE Behaviors in Idle

Mode

Southern Eastern Africa Learning

Services


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Copyright 2010 Huawei Technologies Co., Ltd. All r ights reserved. Page1

Foreword

UE behaviors in idle mode include:

PLMN selection

System information reception

Cell selection and reselection

Location registration

Paging procedure

Access procedure

PLMN selection

Used to ensure that the PLMN selected by the UE provides services properly.

System information reception

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

actions accordingly.

Cell selection and reselection

Used to ensure 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.

Paging procedure

Used for the network to send paging messages to a UE which is in idle mode, CELL_PCHstate, or URA_PCH state.

Access procedure

From the view of access stratum, access is the procedure the UE shift from idle mode to

connected mode.


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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 in UTRAN 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 (Cont.)

Slot synchronization

Frame synchronization andcode-group identification

Primary scrambling codeidentification

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 identifiedthrough 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 above can be simplified.


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PLMN Selection

Equivalent PLMNs : The Mobile Equipment stores a list of "equivalent PLMNs". This list is

replaced at the end of each location update procedure or routing area update procedure.The stored list consists of a list of equivalent PLMNs as downloaded by the network plus

the PLMN code of the registered PLMN that downloaded the list.


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Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page9

PLMN Selection (Cont.)

When the UE is switched on, or the coverage is restored, then

the UE selects the registered PLMN or its equivalent PLMNs

If no registered PLMN or equivalent PLMNs is available, or if

registration fails, the UE performs one of the follow ing two

procedures, depending on its operating mode:

Automatic PLMN selection: the UE automatically selects a PLMN

according to the priority order

Manual PLMN selection: the UE shows all available PLMNs to the

subscriber. The subscriber then selects a PLMN

The UE can get system information from PCCPCH, and the PLMN information is

transmitted in MIB of PCCPCH.

After getting the MIB, the UE can judge whether the current PLMN is right one. If so, the

UE will get SIB scheduling information from the MIB; if not, the UE will search another

carrier, do this procedure again.

The priority order of automatic PLMN selection mode:


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PLMN Selection (Cont.)

Automatic PLMN selection: UE can select a PLMN from the Home

PLMNs (HPLMNs) and roam in the Visited PLMN (VPLMN)

Selecting from the HPLMNs: 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

Roaming in the VPLMN: UE periodically searches for the HPLMN and

higher priority PLMNs for better services

Manual PLMN selection: 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

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.

For the PLMN selection in the VPLMN, 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.


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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.

SIB

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

system information elements (IEs) with the same purpose.

Scheduling information for an SIB may only be included in either the MIB or one of the SB.

UE may use the scheduling information in the MIB and SB to locate each SIB to be

acquired. If UE received an SIB in a position according to the scheduling information and

considers the contents as valid, UE will read and store the SIB.


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System Information

SIB1: contains the system information for NAS and the timer/counter

for 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 t imer

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 typical scenarios when the UE read system include the followings :

Before cell selection

After cell reselection

Before location/route update

When the UE enter idle mode from connected mode


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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".


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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 of 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 its capabilities 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 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.


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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 doesnt 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.


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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

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. Value range: -24~0

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

Physical unit: dB

Set this parameter through ADD UCELLSELRESEL, query it through LST

UCELLSELRESEL, and modify it through MOD UCELLSELRESEL.

Qrelevmin

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.

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

Physical unit: dBm




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Parameters of S Criterion (Cont.)

MaxAllowedUlTxPower

Parameter name: Max allowed UE UL TX power

Recommended value: 24, namely 24dBm

MaxAllowedUlTxPower

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

related to the network planning.

Value range: -50~33


Physical unit: dBm




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Measurement Start Criteria

Intra-frequency measurement:

SqualSintrasearch

Qqualmeas QqualminSintrasearch

QqualmeasQqualmin + Sintrasearch

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

If SqualSintrasearch, the UE need to start the intra-frequency measurement.

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

frequency measurement.

Parameters of the measurement start criteria:


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Measurement Start Criteria (Cont.)

Inter-frequency measurement:

Squal Sintersearch

Qqualmeas QqualminSintersearch

QqualmeasQqualmin + Sintersearch

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

If SqualSintersearch, 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.


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Measurement Start Criteria (Cont.)

Inter-RAT measurement:

Squal SsearchRATm

Qqualmeas QqualminSsearchRATm

QqualmeasQqualmin + SsearchRATm

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

If SqualSsearchRATm, 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.


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Parameters of Measurement Start Criteria

IdleSintrasearch

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

Recommended value: 5, namely 5dB

ConnSintrasearch

Parameter name: Intra-freq cell reselection threshold for

connected mode


IdleSintrasearch

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 reselectionprocedure will be started. This parameter is not configured when its value is 127.

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


Physical unit: dB



ConnSintrasearch

Content: A threshold for intra-frequency cell reselection in connect 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 reselectionprocedure will be started. This parameter is not configured when its value is 127.

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


Physical unit: dB




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Parameters of Measurement Start Criteria(Cont.)

IdleSintersearch

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


ConnSintersearch

Parameter name: Inter-freq cell reselection threshold for

connected mode


IdleSintersearch

Content: A 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.

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


Physical unit: dB



ConnSintersearch Content: A threshold for inter-frequency cell reselection in connect 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.

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


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Physical unit: dB




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Parameters of Measurement Start Criteria

(Cont.) SsearchRat

Parameter name: Inter-RAT cell reselection threshold


SearchRat

Content: A threshold for inter-RAT cell reselection. When the quality (CPICH Ec/Nomeasured 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.

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


Physical unit: dB




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Measurement Start Criteria Descript ion

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

the above figure. 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.


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Cell Reselection Criteria

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

RAT cell reselection

The cell-ranking criterion R is defined by:

nsoffsetnmeasn QQR

,, =

hystssmeass QQR += ,

In Rs, smeans serving cell. In Rn, nmeans neighbor cell.

The offset Qoffset1s,nis used for Qoffsets,nto calculate Rn. The hysteresis Qhyst1sis usedfor Qhyststo calculate Rs.

The UE shall rank the cells according to the R criterion, derive Qmeas,nandQmeas,sand

calculate the R values, as described in the following cases:

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/N0 (QualMeas = CPICH_ECNO), the UE shallperform 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,nand Qmeas,sand then calculating the R values of the FDD

cells. The offset Qoffset2s,nis used for Qoffsets,nto calculate Rn, the hysteresis

Qhyst2sis used for Qhyststo calculate Rs.


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Hysteresis and Time Interval

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.


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Parameters of R Criteria

QualMeas

Parameter name: Cell Sel-reselection quality measure

Recommended value: CPICH_ECNO

Treselections

Parameter name: Reselection delay time

Recommended value: 1, namely 1s

QualMeas

Content: Measurement quantity of cell selection and reselection. It can be set toCPICH Ec/N0 or CPICH RSCP.

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

Physical value range: CPICH_ECNO, CPICH_RSCP

Physical unit: None



Treselections

Content: If the signal quality 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. Value range: 0~31

Physical value range: 0~31; step: 1

Physical unit: s




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Parameters of R Criteria (Cont.)

IdleQhyst1s

Parameter name: Hysteresis 1 for idle mode


ConnQhyst1s

Parameter name: Hysteresis 1 for connected mode


IdleQhyst1s

Content: 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.

Value range: 0~20


Physical unit: dB



ConnQhyst1s

Content: The hysteresis value of the serving FDD cells in connected mode in casethe 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 .

Value range: 0~20



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Physical unit: dB




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Parameters of R Criteria (Cont.)

IdleQhyst2s

Parameter name: Hysteresis 2 for idle mode


ConnQhyst2s

Parameter name: Hysteresis 2 for connected mode


IdleQhyst2s

Content: 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 greaterthe slow fading variance is, the greater this parameter.

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


Physical unit: dB



ConnQhyst2s

Content: The hysteresis value of the serving FDD cells in connected 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. Thegreater the slow fading variance is, the greater this parameter.

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


Physical unit: dB




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Parameters of R Criteria (Cont.) IdleQoffset1sn

Parameter name: IdleQoffset1sn


ConnQoffset1sn

Parameter name: ConnQoffset1sn


IdleQoffset1sn

Content: Offset of cell CPICH RSCP measurement value in cell selection or

reselection when the UE is in idle mode.

Value range: -50~50

Physical value range: -50~+50; step: 1

Physical unit: dB

Set this parameter through ADD UINTRAFREQNCELL / ADD UINTERFREQNCELL,

query it through LST UINTRAFREQNCELL / LST UINTERFREQNCELL, and modify it

through MOD UINTRAFREQNCELL / MOD UINTERFREQNCELL.

ConnQoffset1sn

Content: Offset of cell CPICH RSCP measurement value in cell selection orreselection when the UE is in connected mode.

Value range: -50~50

Physical value range: -50~+50; step: 1

Physical unit: dB


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Set this parameter through ADD UINTRAFREQNCELL / ADD UINTERFREQNCELL,

query it through LST UINTRAFREQNCELL / LST UINTERFREQNCELL, and modify it

through MOD UINTRAFREQNCELL / MOD UINTERFREQNCELL.


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Location Registration

The location registration includes:

Location update (for non-GPRS)

Route update (for GPRS)

The types of location registration:

Normal location registration

Periodic location registration

IMSI attach/detach(for non-GPRS)

Location 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.

The 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.

CS domain location registration signaling is shown as following :


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Periodic Location Registration

Periodic location registration is controlled by a Periodic

Location Update timer (T3212, for non-GPRS operation) or aPeriodic Rout ing Area Update timer (T3312, for GPRS operation)

T3212 is set through T3212 on the RNC side

T3312 is set on the CN side

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

availability of the UE.

The value of T3212 is sent by the network to the UE in SIB1. The value of T3312 is sent by

the network to the UE in the NAS messages ATTACH ACCEPT and ROUTING AREA

UPDATE ACCEPT. The value of T3312 shall be unique within an RA.

T3312 signaling procedure is shown as following :

T3312 is sent to UE in the two following scenarios.


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IMSI At tach/Detach

The IMSI attach/detach process facilitates the fast location

registration of the UE in specific conditions

IMSI attach/detach is set through ATT on the RNC side

If the UE still stays in the same LA 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.

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 inthe UPDATED state. This IMSI detach message will not be acknowledged by the network.

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.


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Paging Initiation

CN init iated 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 paging message 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:

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.

When the cell system message is updated: When system messages change, theUTRAN 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.


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Paging Type 1

If UE is in the idle mode or CELL/URA_PCH 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 for idle mode, or in one cell forCELL_PCH state, or in one URA for URA_PCH state.

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 or URA 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

RRCRRCDCCH: PAGING TYPE 2

Paging type 2:

If UE is in CELL_DCH or CELL_FACH statethe 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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DRX Procedure

To 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

The value for the DRX paging cycle length is determined as

follows:

DRX Cycle LengthMAX (2k, PBP) frames

Paging Reception Process : When UE stays in idle mode, CELL_PCH or URA_PCH state, the

UE receives paging indicator from the PICH firstly, then reads the paging information onthe S-CCPCH.

The DRX 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.)

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 Occasion(CELL SFN) Case:

Paging SFN formula:

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

n =0, 1, 2and the requirement is the calculated CELL SFN must be below its

maximum value 4095.

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 (DRX cycle length) + n * (DRX

cycle length).

Paging Occasion(CELL SFN) Case :

One UEs IMSI = 460010912121001, DRX cycle length = 64 frames, the value of the

paging occasion for the UE is shown as the red point in the above figure, in thesepaging occasion(CELL SFN), the UE will read paging indicator from PICH


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DRX Procedure (Cont.)

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

with SFN given by the Paging Occasion

The Page Indicator in the frame to use is calculated by using the

following formula:

Where, PI = (IMSI div 8192) mod NP

NPis the number of paging indicators in one PICH frame

( )( )( ) NpNp

SFNSFNSFNSFNPIq mod144

144mod512/64/8/18

++++=

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.


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Parameters of DRX

DRXCyclelenCoef

Parameter name: DRX cycle length coefficient

Recommended value: 6

PICHMode

Parameter name: PICH mode

Recommend value: V36

DRXCyclelenCoef

Content: This parameter is broadcasted on SIB1. This parameter is used when a UEis in idle mode.

Value range: 6~9

Physical value range: 6~9

Physical unit: None

Set this parameter through ADD UCNDOMAIN, query it through LST UCNDOMAIN,

and modify it through MOD UCNDOMAIN.

PICHMode

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

Value range: V18, V36, V72, V144

Physical value range: 18, 36, 72, 144

Physical unit: None

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


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Parameters of DRX (Cont.)

MaccPageRepeatTimes

Parameter name: Number of page re-TX


MaccPageRepeatTimes

Content: This parameter defines the times of retransmission of paging messages. Ifthe times of retransmission exceeds the value of this parameter, retransmission

stops. For details, refer to the 3GPP TS 25.331 protocol.

Value range: 0~2


Physical unit: None

Set this parameter through SET UDPUCFGDATA, query it through LST

UDPUCFGDATA.


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Two Working Modes 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 typical 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#4p-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

UE will transmit the preamble at the access time slot.

Access frame is composed of two 10ms radio frames, which is divided into 15 access timeslot, 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

SFN mod8

Random access sub-channels number

0 1 2 3 4 5 6 7 8 9 10 11

0 0 1 2 3 4 5 6 7

1 12 13 14 8 9 10 11

2 0 1 2 3 4 5 6 7

3 9 10 11 12 13 14 8

4 6 7 0 1 2 3 4 5

5 8 9 10 11 12 13 14

6 3 4 5 6 7 0 1 2

7 8 9 10 11 12 13 14

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

following 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. Set Preamble signatures and RACH sub-channel no. through ADD UPRACHBASIC, query

them through LST UPRACH.


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Random Access Channel Case

Sub Channels how to use Access Slots ?

p-p

If UE1 can use all sub channels(0 ~ 11). If UE2 can only use sub channels (0~2).

p-p: time interval between two PRACH preambles.


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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 RACHapplications 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.

Set ASC of PRACH through ADD UPRACHASC, modify it through MOD UPRACHASC, and

remove it through RMV UPRACHASC.


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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 these 10 classes show the same priority. Access class 11~15 are allocated to specific high priority users as follows. (The

enumeration is not meant 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 (11to 15) are barred. Otherwise, Emergency Calls are allowed.


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Mapping between AC and ASC

The AC-ASC mapping information is optional and used for the

System Information Block 5 (SIB5) only

AC-ASC mapping case

Set the mapping between AC and ASC through ADD UPRACHACTOASCMAP, modify it

through MOD UPRACHACTOASCMAP, and remove it through RMV UPRACHACTOASCMAP.


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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 inthe 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 preamble transmission power and Commanded Preamble Power to

Preamble_Initial_Power.

5. Transmit a preamble using the selected uplink access slot, signature, andpreamble 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 preamble transmission power and Commanded Preamble

Power by Power Ramp Step, whereas the maximum value of preamble

transmission power is equal to MaxallowedUlTxPower.

D: Decrease the Preamble Retransmission Counter by one. If the PreambleRetransmission Counter > 0 and Commanded Preamble Power maximum

allowed power < 6dB, then repeat from step 5. 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.

8. If a positive acquisition indicator corresponding to the selected signature is

detected, UE transmits the random access message three or four uplink access slots

after the uplink access slot of the last transmitted preamble. After that, exit the

physical random access procedure.


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RRC Connection Message

Typical RRC connection messages:

RRC_CONNECTION_REQUEST

RRC_CONNECTION_SETUP

RRC_CONNECTION_SETUP_COMPLETE

RRC_CONNECTION_RELEASE

When a UE needs network service, it first sets up RRC connection as follows:

The UE sends a RRC CONNECTION REQUEST message from the cell where it campsto the RNC.

The RNC allocates related resources for the UE and sends an RRC CONNECTION

SETUP message to the UE.

The UE sends a RRC CONNECTION SETUP COMPLETE message to the RNC. The RRC

connection setup ends.


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UE Timers and Constants in Idle Mode

T300

Parameter name: Timer 300 [ms]

Recommended value: D2000, namely 2s

N300

Parameter name: Constant 300


T300

Content: T300 is started when UE sends the RRC CONNECTION REQUEST message.

It is stopped when UE receives the RRC CONNECTION SETUP message. RRC

CONNECTION REQUEST will be resent upon the expiry of the timer if V300 is lowerthan or equal to N300, else enter idle mode.

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

Set this parameter through SET UIDLEMODETIMER, query it through LST

UIDLEMODETIMER.

N300

Content: Maximum number of retransmissions of the RRC CONNECTION REQUESTmessage.

Value range: 0~7


Physical unit: None

Set this parameter through SET UIDLEMODETIMER, query it through LST

UIDLEMODETIMER.


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UE Timers and Constants in Idle Mode

(Cont.)


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RRC Connection Establish Channel Type

and Bit Rate RrcCause

Parameter name: Cause of RRC connection establishment

Recommended value: refer to next page

SigChType

Parameter name: Channel type for RRC establishment

Recommended value: refer to next page

RrcCause

Content: This parameter specifies the cause of RRC connection establishment, thatis, the value of the Establishment cause IE in the RRC CONNECTION REQUEST

message.

Value range: ORIGCONVCALLEST, ORIGSTREAMCALLEST, ORIGINTERCALLEST,

ORIGBKGCALLEST, ORIGSUBSTRAFFCALLEST, TERMCONVCALLEST,

TERMSTREAMCALLEST, TERMINTERCALLEST, TERMBKGCALLEST, EMERGCALLEST,

INTERRATCELLRESELEST, INTERRATCELLCHGORDEREST, REGISTEST, DETACHEST,

ORIGHIGHPRIORSIGEST, ORIGLOWPRIORSIGEST, CALLREEST,

TERMHIGHPRIORSIGEST, TERMLOWPRIORSIGEST, TERMCAUSEUNKNOWN,

MBMSCALLEST, DEFAULTEST

Set this parameter through SET URRCESTCAUSE, query it through LST

URRCESTCAUSE.


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SigChType

Content: This parameter specifies the channel type and bit rate for RRC connection

establishment.

Value range: FACH, DCH_3.4K_SIGNALLING, DCH_6.8K_SIGNALLING,DCH_13.6K_SIGNALLING, DCH_27.2K_SIGNALLING

FACH: The RRC connection is set up on the common channel.

DCH_3.4K_SIGNALLING: The RRC connection is set up on the 3.4 kbit/s

dedicated channel.


dedicated channel.


dedicated channel.


dedicated channel.

Set this parameter through SET URRCESTCAUSE, query it through LST

URRCESTCAUSE.


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OWO115010 WCDMA RAN13 UE Behaviors in Idle Mode ISSUE1.pdf

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