owj200101 wcdma ue behaviors in idle mode
TRANSCRIPT
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
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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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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
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
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
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Cell Search
Slot synchronization
Frame synchronization and
code-group identification
Primary Scrambling code
identification
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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.
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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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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.
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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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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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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
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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.
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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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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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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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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:
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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
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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
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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.
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Measurement Start Criteria
Intra-frequency measurement
Squal ≤ Sintrasearch
↓
Qqualmeas − Qqualmin ≤ Sintrasearch
↓
Qqualmeas ≤ Qqualmin + Sintrasearch
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Measurement Start Criteria (Cont.)
Inter-frequency measurement
Squal ≤ Sintersearch
↓
Qqualmeas − Qqualmin ≤ Sintersearch
↓
Qqualmeas ≤ Qqualmin + Sintersearch
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Measurement Start Criteria (Cont.)
Inter-RAT measurement
Squal ≤ SsearchRATm
↓
Qqualmeas − Qqualmin ≤ SsearchRATm
↓
Qqualmeas ≤ Qqualmin + SsearchRATm
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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
Recommended value: None
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Parameters of Measurement Start Criteria
IDLESINTERSEARCH
Parameter name: Inter-freq cell reselection threshold for idle
mode
Recommended value: None
CONNSINTERSEARCH
Parameter name: Inter-freq cell reselection threshold for
connected mode
Recommended value: None
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Parameters of Measurement Start Criteria
SSEARCHRAT
Parameter name: Inter-RAT cell reselection threshold
Recommended value: None
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Measurement Start Criteria Description
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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 :
n s
offset nmeasn QQ R,,
hysts smeas s QQ R ,
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Hysteresis and Time Interval
TimeTreselection
Quality
Rn
Rs
Qmeas,n
Qmeas,s
Qhyst,s
Qoffsets,n
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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
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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.
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Parameters of Criterion R (Cont.)
TRESELECTIONS
Parameter name: Reselection delay time
Recommended value: 1, namely 1s.
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Parameters of Criterion R (Cont.)
IDLEQOFFSET1SN
Parameter name: IdleQoffset1sn
Recommended value: 0, namely 0dB.
CONNQOFFSET1SN
Parameter name: ConnQoffset1sn
Recommended value: 0, namely 0dB.
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Parameters of Criterion R (Cont.)
IDLEQOFFSET2SN
Parameter name: IdleQoffset2sn
Recommended value: 0, namely 0dB.
CONNQOFFSET2SN
Parameter name: ConnQoffset2sn
Recommended value: 0, namely 0dB.
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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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Location Registration
The location registration includes:
Location update (for non-GPRS)
Route update (for GPRS)
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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)
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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
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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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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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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
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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
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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
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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= (2^K)×PBP frames
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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 mod M) mod (DRX cycle length div PBP)} * PBP
+ n * DRX cycle length + Frame Offset
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DRX Procedure (Cont.)
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
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DRX Procedure (Cont.)
PICH
Associated S-CCPCH frame
PICH frame containing paging indicator
Time offset between PICH and S-CCPCH
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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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Parameters of DRX
MACCPAGEREPEAT
Parameter name: Number of page re-TX
Recommended value: 1
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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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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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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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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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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
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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.
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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
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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.
Random Access Procedure START
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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
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RRC Connection Message
Typical RRC connection messages
RRC_CONNECTION_REQUEST
RRC_CONNECTION_SETUP
RRC_CONNECTION_SETUP_COMPLETE
RRC_CONNECTION_RELEASE
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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
Recommended value: 3
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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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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
RRC Connection Establish Channel
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RRC Connection Establish Channel
Type and Bit Rate
INTRAMEASCTRL
Parameter name: IntraMeas Ctrl Ind for RRC establishment
Recommended value: SUPPORT
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