OWJ200101 WCDMA UE Behaviors in Idle Mode

8/22/2019 OWJ200101 WCDMA UE Behaviors in Idle Mode

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Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

UE Behaviors in Idle

Mode



Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved. Page1

Foreword

UE behaviors in idle mode include :

PLMN selection

System information reception

Cell selection and reselection

Location registration

Paging procedure

Access procedure




Contents

1. PLMN Selection

2. System Information Reception

3. Cell Selection and Reselection

4. Location Registration

5. Paging Procedure

6. Access Procedure




Contents

1. PLMN Selection




5. Paging Procedure

6. Access Procedure




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




Cell Search

Slot synchronization

Frame synchronization and

code-group identification

Primary Scrambling code

identification




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.




PLMN Selection (Cont.)

PLMN Selection in HPLMNs

Automatic PLMN Selection Mode

The UE selects an available and suitable PLMN from the whole

band according to the priority order

Manual PLMN Selection Mode

The order of manual selection is the same as that of automatic

selection.




PLMN Selection (Cont.)

PLMN Selection in VPLMNs

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.




Contents

1. PLMN Selection




5. Paging Procedure

6. Access Procedure




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

SIB1: Contains the system information for NAS and thetimer/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

timer for SIB7

SIB11: Contains measurement controlling information




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.




Contents

1. PLMN Selection




5. Paging Procedure

6. Access Procedure




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




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.




Cell Selection Criteria

minqual qualmeasqual QQS

oncompensatirxlevrxlevmeasrxlev P QQS 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:




Parameters of Criterion S

QUALMEAS

Parameter name: Cell Sel-reselection quality measure

Recommended value: CPICH_ECNO

QQUALMIN

Parameter name: Min quality level

Recommended value: -18, namely -18dB




Parameters of Criterion S (Cont.)

QRXLEVMIN

Parameter name: Min Rx level

Recommended value: -58, namely -115dBm

MAXALLOWEDULTXPOWER

Parameter name: Max allowed UE UL TX power

Recommended value: 21, namely 21dBm




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.




Measurement Start Criteria

Intra-frequency measurement

Squal ≤ Sintrasearch

↓

Qqualmeas − Qqualmin ≤ Sintrasearch

↓

Qqualmeas ≤ Qqualmin + Sintrasearch




Measurement Start Criteria (Cont.)

Inter-frequency measurement

Squal ≤ Sintersearch

↓

Qqualmeas − Qqualmin ≤ Sintersearch

↓

Qqualmeas ≤ Qqualmin + Sintersearch




Measurement Start Criteria (Cont.)

Inter-RAT measurement

Squal ≤ SsearchRATm

↓

Qqualmeas − Qqualmin ≤ SsearchRATm

↓

Qqualmeas ≤ Qqualmin + SsearchRATm




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






IDLESINTERSEARCH

Parameter name: Inter-freq cell reselection threshold for idle

mode


CONNSINTERSEARCH

Parameter name: Inter-freq cell reselection threshold for

connected mode






SSEARCHRAT

Parameter name: Inter-RAT cell reselection threshold





Measurement Start Criteria Description




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 :

n s

offset nmeasn QQ R,,

hysts smeas s QQ R ,




Hysteresis and Time Interval

TimeTreselection

Quality

Rn

Rs

Qmeas,n

Qmeas,s

Qhyst,s

Qoffsets,n




Parameters of Criterion R

IDLEQHYST1S

Parameter name: Hysteresis 1 for idle mode

Recommended value: 2, namely 4dB

CONNQHYST1S

Parameter name: Hysteresis 1 for connect mode

Recommended value: 2, namely 4dB




Parameters of Criterion R (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.





TRESELECTIONS

Parameter name: Reselection delay time

Recommended value: 1, namely 1s.





IDLEQOFFSET1SN

Parameter name: IdleQoffset1sn

Recommended value: 0, namely 0dB.

CONNQOFFSET1SN

Parameter name: ConnQoffset1sn






IDLEQOFFSET2SN

Parameter name: IdleQoffset2sn


CONNQOFFSET2SN

Parameter name: ConnQoffset2sn





Contents

1. PLMN Selection




5. Paging Procedure

6. Access Procedure




Location Registration

The location registration includes:

Location update (for non-GPRS)

Route update (for GPRS)




Periodic Location Registration

Periodic location registration is controlled by a Periodic

Location Update timer (T3212) or a Periodic Routing Area

Update timer (T3312)




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




Contents

1. PLMN Selection




5. Paging Procedure

6. Access Procedure




Paging Initiation

CN initiated paging

Establish a signaling connection

UTRAN initiated paging

Trigger the cell update procedure

Trigger reading of updated system information




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 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




Typical Call Flow of UEUE NAS UE AS NSS MSC

paging

AUTHENTICATION REQUEST

AUTHENTICATION RESPONSE

RR_SECURITY_CONTROL_REQ

(IK CK)

Security mode control

SETUP

CALL CONFIRM

ALERT

CONNECT

CONNECT ACKNOWLEDGE

RAB setup process

paging

RR_EST_REQ (PAGING RESPONSE)

RR_PAING_IND

INITIAL_DIRECT_TRANSFER

(PAGING RESPONSE)

RANAPRANAP

RRC setup process




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＝ (2^K)×PBP frames




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 mod M) mod (DRX cycle length div PBP)} * PBP

+ n * DRX cycle length + Frame Offset





Np Np

SFN SFN SFN SFN PI q mod144

144mod512/64/8/18

UE must calculate q to know which PI to monitor in one

frame of PICH

The q value is achieved by the following formula :

Where, PI = (IMSI div 8192) mod N P





PICH

Associated S-CCPCH frame

PICH frame containing paging indicator

Time offset between PICH and S-CCPCH




Parameters of DRX

DRXCYCLELENCOEF

Parameter name: DRX cycle length coefficient

Recommended value: 6

PICHMODE

Parameter name: PICH mode

Recommended value: V36.




Parameters of DRX

MACCPAGEREPEAT

Parameter name: Number of page re-TX





Contents

1. PLMN Selection




5. Paging Procedure

6. Access Procedure




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




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




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

Definition




RACH Sub-Channels

SFN mod 8 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 areillustrated by the following table




Access Service Class

The PRACH resources can be classified into several ASCs,so as to provide RACH applications with different priorities.




Access Control

“Access Control” is used by network operators to preventoverload of radio access channels under critical conditions.

Access class 0~Access Class 9

Access class 11~Access Class 15

Access class 10




Mapping between AC and ASC

The AC-ASC mapping information is optional and used for the System Information Block 5 (SIB5) only.

Random Access Procedure START




Random Access Procedure 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 physical status to be RACH

message transmitted Set physical status to be Nackon AICH received

Choose a access slot again

Counter> 0 & Preamble power-

maximum allowed power<6 dB

Choose a signature andincrease preamble transmit power

Set physical status to be Nack

on AICH received

Get negative AI

No AI

Report the physical status to MAC

END

Get positive AI

The counter of preamble retransmit

Subtract-1, Commanded preamble power

increased by Power Ramp Step

N

Y

Send the corresponding message part




RRC Connection Message

Typical RRC connection messages

RRC_CONNECTION_REQUEST

RRC_CONNECTION_SETUP

RRC_CONNECTION_SETUP_COMPLETE

RRC_CONNECTION_RELEASE




UE Timers and Constants in Idle Mode

T300

Parameter name: Timer 300 [ms]

Recommended value: D2000, namely 2000ms

N300

Parameter name: Constant 300





UE Timers and Constants in Idle Mode

T312

Parameter name: Timer 312 [s]

Recommended value: 6, namely 6s

N312

Parameter name: Constant 312

Recommended value: D1, namely 1

RRC Connection Establish Channel





Type and Bit Rate

RRCCAUSE

Parameter name: Cause of RRC connection establishment

Recommended value: none

SIGCHTYPE

Parameter name: Channel type for RRC establishment

Recommended value: none






Type and Bit Rate

INTRAMEASCTRL

Parameter name: IntraMeas Ctrl Ind for RRC establishment

Recommended value: SUPPORT



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OWJ200101 WCDMA UE Behaviors in Idle Mode

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