08 ue behaviors in idle mode

1
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Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
UE Behaviors in Idle
Mode
Page1Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Foreword
l UE behaviors in idle mode include :
p PLMN selection
p System information reception
p Cell selection and reselection
p Location registration
p Paging procedure
p Access procedure

2
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

3
Cell Search
l UE does not have UTRAN carrier information
p 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
l UE has UTRAN carrier information
p 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

4
PLMN Selection
l 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.
l The UE selects a PLMN from HPLMNs or VPLMNs.
PLMN Selection (Cont.)
l PLMN Selection in HPLMNs
p Automatic PLMN Selection Mode
n The UE selects an available and suitable PLMN from the whole band
according to the priority order
p Manual PLMN Selection Mode
n The order of manual selection is the same as that of automatic selection.

5
PLMN Selection (Cont.)
l PLMN Selection in VPLMNs
p 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

6
Structure of System Information
l System information is organized as a tree, including:
p MIB (Master Information Block )
p SB (Scheduling Block )
p SIB (System Information Block )
System Information
l SIB1: Contains the system information for NAS and the timer/counter
for UE
l SIB2: Contains the URA information
l SIB3: Contains the parameters for cell selection and cell re-selection
l SIB5: Contains parameters for the common physical channels of the
cell
l SIB7: Contains the uplink interference level and the refreshing timer
for SIB7
l SIB11: Contains measurement controlling information

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Reception of System Information
l 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

8
Cell Selection
l 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.
l There are four states involved in cell selection:
p Camped normally
p Any cell selection
p Camped on any cell
p Connected mode
Cell Selection (Cont.)
l Two types of cell selection:
p Initial cell selection
n If no cell information is stored for the PLMN, the UE starts this procedure.
p Stored information cell selection
n If cell information is stored for the PLMN, the UE starts this procedure.

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Cell Selection Criteria
minqualqualmeasqual QQS −=
oncompensatirxlevrxlevmeasrxlev PQQS −−= min
l Criterion S is used by the UE to judge whether the cell is
suitable to camped on.
l Criterion S : Srxlev > 0 & Squal > 0, where:
Parameters of Criterion S
l QUALMEAS
p Parameter name: Cell Sel-reselection quality measure
p Recommended value: CPICH_ECNO
l QQUALMIN
p Parameter name: Min quality level
p Recommended value: -18, namely -18dB

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Parameters of Criterion S (Cont.)
l QRXLEVMIN
p Parameter name: Min Rx level
p Recommended value: -58, namely -115dBm
l MAXALLOWEDULTXPOWER
p Parameter name: Max allowed UE UL TX power
p Recommended value: 21, namely 21dBm
Cell Reselection
l 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
l Intra-frequency measurement
Squal ≤ Sintrasearch
↓
Qqualmeas − Qqualmin ≤ Sintrasearch
↓
Qqualmeas ≤ Qqualmin + Sintrasearch
Measurement Start Criteria (Cont.)
l Inter-frequency measurement
Squal ≤ Sintersearch
↓
Qqualmeas − Qqualmin ≤ Sintersearch
↓
Qqualmeas ≤ Qqualmin + Sintersearch

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Measurement Start Criteria (Cont.)
l Inter-RAT measurement
Squal ≤ SsearchRATm
↓
Qqualmeas − Qqualmin ≤ SsearchRATm
↓
Qqualmeas ≤ Qqualmin + SsearchRATm
Parameters of Measurement Start Criteria
l IDLESINTRASEARCH
p Parameter name: Intra-freq cell reselection threshold for idle mode
p Recommended value: None
l CONNSINTRASEARCH
p Parameter name: Intra-freq cell reselection threshold for
connected mode

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l IDLESINTERSEARCH
p Parameter name: Inter-freq cell reselection threshold for idle mode
l CONNSINTERSEARCH
p Parameter name: Inter-freq cell reselection threshold for
connected mode
l SSEARCHRAT
p Parameter name: Inter-RAT cell reselection threshold

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Measurement Start Criteria Description
Cell Reselection Criteria
l Criterion R is used for intra-frequency, inter-frequency cells and
inter-RAT cell reselection.
l The cell-ranking criterion R is defined by :
nsoffsetnmeasn QQR ,, −=
hystssmeass QQR += ,

15
Hysteresis and Time Interval
Time
Treselection
Quality
Rn
Rs
Qmeas,n
Qmeas,s
Qhyst,s
Qoffsets,n
Parameters of Criterion R
l IDLEQHYST1S
p Parameter name: Hysteresis 1 for idle mode
p Recommended value: 2, namely 4dB
l CONNQHYST1S
p Parameter name: Hysteresis 1 for connect mode
p Recommended value: 2, namely 4dB

16
Parameters of Criterion R (Cont.)
l IDLEQHYST2S
p Parameter name: Hysteresis 2 for idle mode
p Recommended value: Qhyst1s for idle mode
l CONNQHYST2S
p Parameter name: Hysteresis 2 for connected mode
p Recommended value: Qhyst1s for connected mode.
l TRESELECTIONS
p Parameter name: Reselection delay time
p Recommended value: 1, namely 1s.

17
l IDLEQOFFSET1SN
p Parameter name: IdleQoffset1sn
p Recommended value: 0, namely 0dB.
l CONNQOFFSET1SN
p Parameter name: ConnQoffset1sn
l IDLEQOFFSET2SN
p Parameter name: IdleQoffset2sn
l CONNQOFFSET2SN
p Parameter name: ConnQoffset2sn

18
Contents
1. PLMN Selection
5. Paging Procedure
6. Access Procedure
Location Registration
l The location registration includes:
p Location update (for non-GPRS)
p Route update (for GPRS)

19
Periodic Location Registration
l Periodic location registration is controlled by a Periodic
Location Update timer (T3212) or a Periodic Routing Area
Update timer (T3312)
Parameters of Location Registration
l T3212
p Parameter name: Periodical location update timer [6min]
p Recommended value: 10, namely 60min
l ATT
p Parameter name: Attach/detach indication
p Recommended value: ALLOWED

20
Contents
1. PLMN Selection
5. Paging Procedure
6. Access Procedure
Structure of System Information
l System information is organized as a tree, including:
p MIB (Master Information Block )
p SB (Scheduling Block )
p SIB (System Information Block )

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System Information
l SIB1: Contains the system information for NAS and the timer/counter
for UE
l SIB2: Contains the URA information
l SIB3: Contains the parameters for cell selection and cell re-selection
l SIB5: Contains parameters for the common physical channels of the
cell
l SIB7: Contains the uplink interference level and the refreshing timer
for SIB7
l SIB11: Contains measurement controlling information
Reception of System Information
l 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.

22
Contents
1. PLMN Selection
5. Paging Procedure
6. Access Procedure
Paging Initiation
l CN initiated paging
l Establish a signaling connection
l UTRAN initiated paging
l Trigger the cell update procedure
l Trigger reading of updated system information

23
Paging Type 1
l 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
l 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

24
Typical Call Flow of UE
UE 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
R AB setup process
paging
RR_EST_REQ (PAGING RESPONSE)
RR_PAING_IND
INITIAL_DIRECT_TRANSFER
(PAGING RESPONSE)
RA NA PRA NA P
RR C setup process
DRX Procedure
l UE receives the paging indicator on PICH periodically, that is
the Discontinuous Reception (DRX)
l The value for the DRX paging cycle length is determined as
follows: :
DRX Cycle Length ＝ (2^K)×PBP frames

25
DRX Procedure (Cont.)
l 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.
l 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
SFNSFNSFNSFNPIq mod
144
144mod512/64/8/18 









×+++×+=
l UE must calculate q to know which PI to monitor in one frame
of PICH
l The q value is achieved by the following formula :
l Where, PI = (IMSI div 8192) mod NP

26
τPICH
Associated S-CCPCH frame
PICH frame containing paging indicator
l Time offset between PICH and S-CCPCH
Parameters of DRX
l DRXCYCLELENCOEF
p Parameter name: DRX cycle length coefficient
p Recommended value: 6
l PICHMODE
p Parameter name: PICH mode
p Recommended value: V36.

27
Parameters of DRX
l MACCPAGEREPEAT
p Parameter name: Number of page re-TX
Contents
1. PLMN Selection
5. Paging Procedure
6. Access Procedure

28
Two Working Mode of UE
l Idle mode
p After turning on, UE will stay in idle mode
l Connected mode
p UE will switch to connected mode which could be CELL_FACH
state or CELL_DCH state from the idle mode
p After releasing RRC connection, UE will switch to the idle mode
from the connected mode
Random Access Procedure
l Definition
p 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

29
Random Access Channel
AICH access
slots
10 ms
#0 #1 #2 #3 #14#13#12#11#10#9#8#7#6#5#4τp-a
#0 #1 #2 #3 #14#13#12#11#10#9#8#7#6#5#4
PRACH
access slots
SFN mod 2 = 0 SFN mod 2 = 1
10 ms
Access slot set 1 Access slot set 2
l Definition
RACH Sub-Channels
141
3
121
1
10987
210765436
1
4
131
2
1
1
10985
543210764
81
4
131
2
111
0
93
765432102
111
0
98141
3
1
2
1
765432100
11109876543210
Random access sub-channels numberSFN mod 8
l The access slots of different RACH sub-channels are illustrated
by the following table

30
Access Service Class
l The PRACH resources can be classified into several ASCs, so as
to provide RACH applications with different priorities.
Access Control
l “Access Control” is used by network operators to prevent
overload of radio access channels under critical conditions.
p Access class 0~Access Class 9
p Access class 11~Access Class 15
p Access class 10

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Mapping between AC and ASC
l The AC-ASC mapping information is optional and used for the
System Information Block 5 (SIB5) only.
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 Nack
on AICH received
Choose a access slot again
Counter> 0
Choose a signature and
increase 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

32
RRC Connection Message
l Typical RRC connection messages
p RRC_CONNECTION_REQUEST
p RRC_CONNECTION_SETUP
p RRC_CONNECTION_SETUP_COMPLETE
p RRC_CONNECTION_RELEASE
UE Timers and Constants in Idle Mode
l T300
p Parameter name: Timer 300 [ms]
p Recommended value: D2000, namely 2000ms
l N300
p Parameter name: Constant 300

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UE Timers and Constants in Idle Mode
l T312
p Parameter name: Timer 312 [s]
p Recommended value: 6, namely 6s
l N312
p Parameter name: Constant 312
p Recommended value: D1, namely 1
RRC Connection Establish Channel Type
and Bit Rate
l RRCCAUSE
p Parameter name: Cause of RRC connection establishment
p Recommended value: none
l SIGCHTYPE
p Parameter name: Channel type for RRC establishment
p Recommended value: none

34
RRC Connection Establish Channel Type
and Bit Rate
l INTRAMEASCTRL
p Parameter name: IntraMeas Ctrl Ind for RRC establishment
p Recommended value: SUPPORT
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08 ue behaviors in idle mode

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