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www.huawei.com
Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
WCDMA UE Behaviors
in Idle Mode
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Page1Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Foreword UE behaviors in idle mode include :
PLMN selection
System information reception
Cell selection and reselection
Location registration
Paging procedure
Access procedure
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Page2Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Contents1. PLMN Selection
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
5. Paging Procedure
6. Access Procedure
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Page3Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Contents1. PLMN Selection
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
5. Paging Procedure
6. Access Procedure
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Page4Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Cell Search UE does not have UTRAN carrier information
In order to find a suitable cell to stay, UE will scan all thefrequencies 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
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Page5Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Cell Search
Slot synchronization
Frame synchronization and
code-group identification
Primary Scrambling codeidentification
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Page6Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
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.
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Page7Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
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.
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Page8Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
PLMN Selection (Cont.) PLMN Selection in VPLMNs
If a UE is in a VPLMN, it scans the user controlled PLMNselector 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.
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Page9Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Contents1. PLMN Selection
2. System Information Reception3. Cell Selection and Reselection
4. Location Registration
5. Paging Procedure
6. Access Procedure
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Page10Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Structure of System Information System information is organized as a tree, including:
MIB (Master Information Block )
SB (Scheduling Block )
SIB (System Information Block )
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Page11Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
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
timer for SIB7 SIB11: Contains measurement controlling information
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Page12Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Reception of System Information The UE shall read system information broadcast on a BCH
transport channel when the UE is in idle mode or inconnected mode, that is, in CELL_FACH, CELL_PCH, or
URA_PCH state.
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Page13Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Contents1. PLMN Selection
2. System Information Reception3. Cell Selection and Reselection
4. Location Registration
5. Paging Procedure
6. Access Procedure
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Page14Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
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
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Page15Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
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.
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Page16Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
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:
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Page17Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of S Criterion QUALMEAS
Parameter name: Cell Se-reselection quality measure
Recommended value: CPICH_ECNO
QQUALMIN
Parameter name: Min quality level
Recommended value: -18, namely -18dB
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Page18Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of S Criterion 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
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Page19Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
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.
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Page20Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Measurement Start Criteria (Cont.) Intra-frequency measurement
Squal Sintrasearch
Qqualmeas Qqualmin Sintrasearch
Qqualmeas Qqualmin + Sintrasearch
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Page21Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Measurement Start Criteria (Cont.) Inter-frequency measurement
Squal Sintersearch
Qqualmeas Qqualmin Sintersearch
Qqualmeas Qqualmin + Sintersearch
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Page22Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Measurement Start Criteria (Cont.) Inter-RAT measurement
Squal SsearchRATm
Qqualmeas Qqualmin SsearchRATm
Qqualmeas Qqualmin + SsearchRATm
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Page23Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of Measurement Start Criteria
IDLESINTRASEARCH
Parameter name: Intra-freq cell reselection threshold for idlemode
Recommended value: None
CONNSINTRASEARCH
Parameter name: Intra-freq cell reselection threshold for
connected mode
Recommended value: None
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Page24Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of Measurement Start Criteria
IDLESINTERSEARCH
Parameter name: Inter-freq cell reselection threshold for idlemode
Recommended value: None
CONNSINTERSEARCH
Parameter name: Inter-freq cell reselection threshold for
connected mode
Recommended value: None
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Page25Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of Measurement Start Criteria
SSEARCHRAT
Parameter name: Inter-RAT cell reselection threshold Recommended value: None
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Page26Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Measurement Start Criteria Description
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Page27Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
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 :
nsoffsetnmeasnQQR
,,=
hystssmeass QQR += ,
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Page28Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Hysteresis and Time Interval
TimeTreselection
Quality
Rn
Rs
Qmeas,n
Qmeas,s
Qhyst,s
Qoffsets,n
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Page29Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of R Criteria 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
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Page30Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
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.
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Page31Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of R Criteria (Cont.) TRESELECTIONS
Parameter name: Reselection delay time
Recommended value: 1, namely 1s.
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Page32Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of R Criteria (Cont.) IDLEQOFFSET1SN
Parameter name: IdleQoffset1sn
Recommended value: 0, namely 0dB.
CONNQOFFSET1SN
Parameter name: ConnQoffset1sn
Recommended value: 0, namely 0dB.
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Page33Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of R Criteria (Cont.) IDLEQOFFSET2SN
Parameter name: IdleQoffset2sn
Recommended value: 0, namely 0dB.
CONNQOFFSET2SN
Parameter name: ConnQoffset2sn
Recommended value: 0, namely 0dB.
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Page34Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Contents1. PLMN Selection
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
5. Paging Procedure
6. Access Procedure
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Page35Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Location Registration The location registration includes:
Location update (for non-GPRS)
Route update (for GPRS)
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Page36Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Periodic Location Registration Periodic location registration is controlled by a Periodic
Location Update timer (T3212) or a Periodic Routing Area
Update timer (T3312)
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Page37Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
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
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Page38Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Contents1. PLMN Selection
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
5. Paging Procedure
6. Access Procedure
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Page39Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Paging Initiation CN initiated paging
Establish a signaling connection
UTRAN initiated paging
Trigger the cell update procedure
Trigger reading of updated system information
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Page40Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Paging Type 1 If UE is in CELL_PCH,URA_PCH or IDLE statethe 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
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Page41Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Paging Type 2 If UE is in CELL_DCH or CELL_FACH statethe paging
message will be transmitted on DCCH with paging type 2
CN SRNC UE
RANAPRANAP
PAGING
RRCRRC
DCCH: PAGING TYPE 2
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Page42Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Typical Call Flow of UEUE NAS UE AS NSS MSCpaging
AUTHENTICATION REQUEST
AUTHENTICATION RESPONSE
RR_SECURITY_CONTROL_REQ
(IK CK)
Secu rity 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
RR C setup process
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Page43Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
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
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Page44Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
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
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Page45Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
DRX Procedure (Cont.)
( )( )( ) NpNp
SFNSFNSFNSFNPIq mod
144
144mod512/64/8/18
++++=
UE must calculate q to know which PI to monitor in one
frame of PICH
The qvalue is achieved by the following formula :
Where, PI = (IMSI div 8192) mod NP
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Page46Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
DRX Procedure (Cont.)
PICH
Associated S-CCPCH frame
PICH frame containing paging indicator
Time offset between PICH and S-CCPCH
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Page47Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of DRX DRXCYCLELENCOEF
Parameter name: DRX cycle length coefficient
Recommended value: 6
PICHMODE
Parameter name: PICH mode
Recommended value: V36.
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Page48Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of DRX MACCPAGEREPEAT
Parameter name: Number of page re-TX
Recommended value: 1
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Page49Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Contents1. PLMN Selection
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
5. Paging Procedure
6. Access Procedure
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Page50Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
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
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Page51Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
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
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Page52Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
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
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Page53Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
RACH Sub-Channels
1413121110987
2107654361413121110985
543210764
8141312111093
765432102
1110981413121
765432100
11109876543210Random access sub-channels numberSFNmod 8
The access slots of different RACH sub-channels are illustrated by
the following table
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Page54Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Access Service Class The PRACH resources can be classified into several ASCs,
so as to provide RACH applications with different priorities.
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Page55Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
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
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Page56Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
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
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Random Access ProcedureSTART
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
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Random Access ProcedureSTART
Choose a RACH sub channel fromavailable 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 RACHmessage transmitted Set physical status to be Nack
on AICH received
Choose a access slot again
Counter> 0 & Preamble power-maximum allowed power
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Page59Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
RRC Connection Message
Typical RRC connection messages
RRC_CONNECTION_REQUEST
RRC_CONNECTION_SETUP
RRC_CONNECTION_SETUP_COMPLETE
RRC_CONNECTION_RELEASE
UE Ti d C t t i Idl M d
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Page60Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
UE Timers and Constants in Idle Mode
T300
Parameter name: Timer 300 [ms]
Recommended value: D2000, namely 2000ms
N300
Parameter name: Constant 300
Recommended value: 3
UE Ti d C t t i Idl M d
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Page61Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
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
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Page62Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
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
RRC Connection Establish Channel
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Page63Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Type and Bit Rate INTRAMEASCTRL
Parameter name: IntraMeas Ctrl Ind for RRC establishment
Recommended value: SUPPORT
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