Owo113010 Wcdma Ue Behaviors in Idle Mode Ran11 Issue1.01
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Transcript of Owo113010 Wcdma Ue Behaviors in Idle Mode Ran11 Issue1.01
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WCDMA UE Behaviors in Idle Mode
www.huawei.com
Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.
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Foreword UE behaviors in idle mode include:
PLMN selection
System information reception
Cell selection and reselection
Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page1
Location registration
Paging procedure
Access procedure
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References 3GPP TS 22.011: Service Accessibility
3GPP TS 23.122: NAS Functions Related to Mobile Station (MS) in Idle Mode
3GPP TS 24.008: Mobile Radio Interface Layer 3 Specification; Core Network Protocols - Stage 3
Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page2
Core Network Protocols - Stage 3
3GPP TS 25.304: UE Procedures in Idle Mode and Procedures for Cell Reselection in Connected Mode
3GPP TS 25.331: Radio Resource Control (RRC) 3GPP TS 31.102: Characteristics of The USIM Application
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Objectives Upon completion of this course, you will be able to:
Describe the working principles of the UE Behaviors in Idle Mode feature
Perform parameters modification of the UE Behaviors in Idle
Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page3
Mode feature
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Contents1. PLMN Selection
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
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5. Paging Procedure
6. Access Procedure
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Contents1. PLMN Selection
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page5
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
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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
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Cell Search (Cont.)Slot synchronization
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Frame synchronization and code-group identification
Primary scrambling code identification
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PLMN Selection When the UE is switched on, or the coverage is restored, or the
UE selects a cell that belongs to another PLMN, then the UE selects the registered PLMN or its equivalent PLMN
If no registered PLMN or equivalent PLMN is available, or if registration fails, the UE performs one of the following two
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registration fails, the UE performs one of the following 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
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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 lowestRoaming in the VPLMN: UE periodically searches for the HPLMN and
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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
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Contents1. PLMN Selection
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
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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 the
timer/counter for UE SIB2: contains the URA information SIB3: contains the parameters for cell selection and cell re-
selection
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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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Contents1. PLMN Selection
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
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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
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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
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Stored information of cell selection If cell information is stored for the PLMN, the UE starts this
procedure
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Cell Selection Criteria
QQS =
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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minqualqualmeasqual QQS =oncompensatirxlevrxlevmeasrxlev PQQS = min
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Parameters of S Criterion Qqualmin
Parameter name: Min quality level
Recommended value: -18, namely -18dB
Qrxlevmin
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Qrxlevmin Parameter name: Min Rx level
Recommended value: -58, namely -115dBm
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Parameters of S Criterion (Cont.) MaxAllowedUlTxPower
Parameter name: Max allowed UE UL TX power
Recommended value: 24, namely 24dBm
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Cell Reselection The signal strength of both serving cell and neighboring
cells varies with the movement of a UE and so the UE needs to select the most suitable cell to camp on. This process is called cell reselection
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Cell reselection process:
Measurement start criteria
Cell reselection criteria
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Measurement Start Criteria Intra-frequency measurement:
Squal Sintrasearch
Qqualmeas Qqualmin Sintrasearch
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Qqualmeas Qqualmin Sintrasearch
Qqualmeas Qqualmin + Sintrasearch
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Measurement Start Criteria (Cont.) Inter-frequency measurement:
Squal Sintersearch
Qqualmeas Qqualmin Sintersearch
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Qqualmeas Qqualmin Sintersearch
Qqualmeas Qqualmin + Sintersearch
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Measurement Start Criteria (Cont.) Inter-RAT measurement:
Squal SsearchRATm
Qqualmeas Qqualmin SsearchRATm
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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: 127, namely none
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ConnSintrasearch Parameter name: Intra-freq cell reselection threshold for
connected mode
Recommended value: 127, namely none
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Parameters of Measurement Start Criteria (Cont.) IdleSintersearch
Parameter name: Inter-freq cell reselection threshold for idle mode
Recommended value: 127, namely none
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ConnSintersearch Parameter name: Inter-freq cell reselection threshold for
connected mode
Recommended value: 127, namely none
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Parameters of Measurement Start Criteria (Cont.) SsearchRat
Parameter name: Inter-RAT cell reselection threshold
Recommended value: 127, namely 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 and
inter-RAT cell reselection
The cell-ranking criterion R is defined by:
hystssmeass QQR += ,
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nsoffsetnmeasn QQR ,, =hystssmeass QQR += ,
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Hysteresis and Time IntervalQuality
Rn
Qmeas,nQhyst,s
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TimeTreselection
Rn
Rs
Qmeas,sQoffsets,n
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Parameters of R Criteria QualMeas
Parameter name: Cell Sel-reselection quality measure
Recommended value: CPICH_ECNO
Treselections
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Treselections
Parameter name: Reselection delay time
Recommended value: 1, namely 1s
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Parameters of R Criteria (Cont.) IdleQhyst1s
Parameter name: Hysteresis 1 for idle mode
Recommended value: 2, namely 4dB
ConnQhyst1s
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ConnQhyst1s
Parameter name: Hysteresis 1 for connected mode
Recommended value: 2, namely 4dB
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Parameters of R Criteria (Cont.) IdleQhyst2s
Parameter name: Hysteresis 2 for idle mode
Recommended value: 2, namely 4dB
ConnQhyst2s
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ConnQhyst2s
Parameter name: Hysteresis 2 for connected mode
Recommended value: 2, namely 4dB
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Parameters of R Criteria (Cont.) IdleQoffset1sn
Parameter name: IdleQoffset1sn
Recommended value: 0, namely 0dB
ConnQoffset1sn
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ConnQoffset1sn Parameter name: ConnQoffset1sn
Recommended value: 0, namely 0dB
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Parameters of R Criteria (Cont.) IdleQoffset2sn
Parameter name: IdleQoffset2sn
Recommended value: 0, namely 0dB
ConnQoffset2sn
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ConnQoffset2sn Parameter name: ConnQoffset2sn
Recommended value: 0, namely 0dB
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Contents1. PLMN Selection
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
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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)
The types of location registration:
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The types of location registration:
Normal location registration
Periodic location registration
IMSI attach/detach
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Periodic Location Registration Periodic location registration is controlled by a Periodic
Location Update timer (T3212, for non-GPRS operation) or a Periodic Routing Area Update timer (T3312, for GPRS operation)
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T3212 is set through T3212 on the RNC side
T3312 is set on the CN side
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IMSI Attach/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
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Parameters of Location Registration T3212
Parameter name: Periodical location update timer [6min] Recommended value: 10, namely 60min
ATT
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ATT
Parameter name: Attach/detach indication
Recommended value: ALLOWED
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Contents1. PLMN Selection
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page41
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
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Trigger the cell update procedure
Trigger reading of updated system information
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Paging Type 1 If UE is in the idle or CELL/URA_PCH state, the paging
message will be transmitted on PCCH with paging type 1CN RNC1 RNC2 NODEB1.1 NODEB2.1 UE
RANAPRANAP
PAGING
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RANAP RANAP
PCCH: PAGING TYPE 1
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 2CN SRNC UE
PAGING
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RANAPRANAP
PAGING
RRCRRC
DCCH: PAGING TYPE 2
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Typical Call Flow of UE UE NAS UE AS NSS M SC
paging
AUTHENTICATION REQ UEST
AUTHENTICATION RESPO NSE
RR_SECURITY_C ONTRO L_REQ
paging
RR_EST_REQ (PAG IN G RESPO NSE) RR_PAING _IND
IN ITIAL_DIREC T_TRAN SFER(PAG ING RESPO NSE)
RANAPRANAP
RR C setup process
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RR_SECURITY_C ONTRO L_REQ(IK CK)
Security m ode contro l
SETUP
C ALL CO NFIRM
ALER T
CO NNECT
CO NNEC T ACKNO W LEDG E
R AB setup process
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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
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called DRX cycle
The value for the DRX paging cycle length is determined as follows:
DRX Cycle Length MAX (2k, PBP) frames
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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
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+ n * DRX cycle length + Frame Offset
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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 Paging Indicator to use is calculated by using the following formula:
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PI = (IMSI div 8192) mod NP
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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
Time offset between PICH and SCCPCH:
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PICH
Associated S-CCPCH frame
PICH frame containing paging indicator
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Parameters of DRX DRXCyclelenCoef
Parameter name: DRX cycle length coefficient
Recommended value: 6
PICHMode
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PICHMode
Parameter name: PICH mode
Recommend value: V36
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Parameters of DRX (Cont.) MaccPageRepeatTimes
Parameter name: Number of page re-TX
Recommended value: 1
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Contents1. PLMN Selection
2. System Information Reception
3. Cell Selection and Reselection
4. Location Registration
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5. Paging Procedure
6. Access Procedure
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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
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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
#0 #1 #2 #3 #14#13#12#11#10#9#8#7#6#5#4p-a
SFN mod 2 = 0 SFN mod 2 = 1
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10 ms
#0 #1 #2 #3 #14#13#12#11#10#9#8#7#6#5#4
PRACHaccess slots
10 ms
Access slot set 1 Access slot set 2
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RACH Sub-Channels
SFN mod 8
Random access sub-channels number0 1 2 3 4 5 6 7 8 9 10 11
0 0 1 2 3 4 5 6 71 12 13 14 8 9 10 11
The access slots of different RACH sub-channels are illustrated by the following table:
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1 12 13 14 8 9 10 112 0 1 2 3 4 5 6 73 9 10 11 12 13 14 84 6 7 0 1 2 3 4 55 8 9 10 11 12 13 146 3 4 5 6 7 0 1 27 8 9 10 11 12 13 14
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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 prevent
overload of radio access channels under critical conditions
Access class 0 ~ Access Class 9
Access class 11 ~ Access Class 15
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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
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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
Change 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 & Commanded Preamble power- maximum allowed power < 6
dB
Choose a signature and increase preamble transmit power
Set physical status to be Nackon AICH received
Get negative AI
No AI
Report the physical status to MAC
END
Get positive AI
The counter of preamble retransmit Subtract by 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
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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 2s
N300
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N300
Parameter name: Constant 300
Recommended value: 3
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UE Timers and Constants in Idle Mode (Cont.) T312
Parameter name: Timer 312 [s] Recommended value: 6, namely 6s
N312
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N312
Parameter name: Constant 312
Recommended value: D1, namely 1
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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
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SigChType Parameter name: Channel type for RRC establishment
Recommended value: refer to next page
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