owa310020 wcdma ran signaling flow issue 1.22
TRANSCRIPT
WCDMA UTRAN Interface and Signaling Procedure
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Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Objectives
Upon completion of this course, you will be able to:
Understand UTRAN interface and structure Understand the definitions about UTRAN network elements Understand UTRAN signaling procedure
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Page2
Contents1. UTRAN Network Overview 2. Basic Concepts about UTRAN 3. UTRAN Signaling Procedure
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UMTS Network StructureCNCore Network CS PS CS PS
Iu-CSRNS
Iu-PS
Iu-CSRNS Iur
Iu-PS
RNC
RNC Iub NodeB Iub NodeB
UTRANIub NodeB
IubNodeB
Uu
UECopyright 2008 Huawei Technologies Co., Ltd. All rights reserved. Page4
Uu InterfaceGC Nt DC
Duplication avoidanceGC C-plane signaling Nt DC U-plane information control UuS boundary
control
control
RRCcontrol control
L3radio bearer PDCP PDCP BMC RLC
L2/PDCP L2/BMC L2/RLClogical channel
RLC
RLC
RLC
RLC RLC RLC
RLC
MACPHYCopyright 2008 Huawei Technologies Co., Ltd. All rights reserved. Page5
L2/MACtransport channel
L1
General Protocol Mode for UTRAN Terrestrial Interface
The structure is based on the principle that the layers and planes are logically independent of each other.Radio Network Layer Control Plane Application ProtocolTransport Network User Plane Transport Network Control Plane
User Plane Data Stream(s)
Transport Network Layer
Transport Network User Plane
ALCAP(s)
Signaling Bearer(s)
Signaling Bearer(s)Physical Layer
Data Bearer(s)
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Page6
RNL Control Plane Application ProtocolCNRANAP
UE
RRC
RNCNBAP
RNSAP
RNC
NodeBNBAP RANAP RNSAP RRC Node B Application Part Radio Access Network Application Part Radio Network Subsystem Application Part Radio Resource ControlPage8
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Iu-CS Interface (based on ATM)Radio Network LayerControl Plane RANAP User plane Iu UP
Transport Network User Plane
Transport Network Control Plane
Transport Network User Plane
Transport Network Layer
ALCAPSCCP A MTP3-B B MTP3-B SAAL NNI AAL2 PATH
SAAL NNI
ATM Physical Layer
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Page9
Iu-CS Interface (based on IP)Radio Network LayerControl Plane RANAP User plane Iu UP
Transport Network User Plane
Transport Network User Plane
Transport Network Layer
SCCP
RTP/RTCP UDP IP DATA LINK Physical Layer
M3UASCTP IP DATA LINK
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Page10
Iu-PS Interface (based on ATM)Radio Network LayerControl Plane RANAP User plane Iu UP
Transport Network Layer
Transport Network User Plane SCCP MTP3-B
Transport Network User Plane GTP-U C UDP IP AAL Type 5
SAAL NNI
ATM Physical Layer
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Page11
Iu-PS Interface (based on IP)Radio Network LayerControl Plane RANAP User plane Iu UP
Transport Network User Plane
Transport Network User Plane
Transport Network Layer
SCCP
M3UASCTP IP DATA LINK Physical Layer
GTP-U UDP IP DATA LINK
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Page12
Iub Interface (based on ATM)Radio Network Layer Control Plane NBAP NCP CCP Transport Network Control Plane Transport Network Layer Transport Network User Plane ALCAP Transport Network User Plane User plane Iub FP
SAAL UNI
SAAL UNI
AAL2 PATH
ATM Physical Layer
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Page13
Iub Interface (based on IP)Radio Network Layer Control Plane NBAP User plane Iub FP
NCP
CCP
Transport Network Layer
Transport Network User PlaneSCTP IP DATA LINK Physical Layer
Transport Network User Plane
UDP IP DATA LINK
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Page14
Iur Interface (based on ATM)Radio Network LayerControl Plane RNSAP User plane
Iur Data Stream Transport Network Control Plane
Transport Network User Plane
Transport Network User Plane
Transport Network Layer
ALCAPSCCP A MTP3-B B MTP3-B SAAL NNI AAL2 PATH
SAAL NNI
ATM Physical Layer
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Page15
Iur Interface (based on IP)Radio Network LayerControl Plane RNSAP User plane Iur Data Stream
Transport Network User Plane
Transport Network User Plane
Transport Network Layer
SCCP
M3UASCTP IP DATA LINK Physical Layer
UDP IP
DATA LINK
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Page16
Contents1. UTRAN Network Overview 2. Basic Concepts about UTRAN 3. UTRAN Signaling Procedure
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Page17
SRNC / DRNCCN
SRNC
DRNC
Interface Data
SRNC and DRNC are concepts for a connected UE. The SRNC handles the connection to one UE, and may borrow radio resources of a certain cell from the DRNC. Drift RNCs support the Serving RNC by providing radio resources A UE in connection state has at least one and only one SRNC, but can has 0 or multiple DRNCsPage18
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RAB, RB and RL
RAB RB UE RL NodeB
RNC
CN
UTRAN
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Page19
UE Working Modes and States
Idle Mode Connected Mode
CELL_DCH CELL_FACH CELL_PCH URA_PCH
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Idle Mode
The UE has no relation to UTRAN, only to CN. For data transfer, a signaling connection has to be established.
UE camps on a cell
It enables the UE to receive system information from the PLMN UE can monitor PICH of a cell for paging
The idle mode tasks can be divided into three processes:
PLMN selection and reselection Cell selection and reselection Location registration
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Page21
Connected Mode
When UE is in connected mode
The UE position can be known on different levels:
Cell level (CELL_DCH/CELL_FACH/CELL_PCH) UTRAN Registration Area (URA) level (URA_PCH)
The UE can use different types of channels in connected mode
Dedicated transport channels (CELL_DCH) Common transport channels (CELL_FACH)
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Page22
Connected Mode
Cell-DCH
In active state Communicating via its dedicated channels UTRAN knows which cell UE stays in
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Page23
Connected Mode
Cell-FACH
In active state Few data to be transmitted both in uplink and in downlink. There is no need to allocate dedicated channel for this UE
Downlink uses FACH and uplink uses RACH UE needs to monitor the FACH for its information UTRAN knows which cell the UE stays in
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Page24
Connected Mode
Cell-PCH
No data to be transmitted or received Monitor PICH, to receive its paging UTRAN knows which cell the UE stays in UTRAN has to update cell information of UE when UE roams to another cell
Lower the power consumption of UE
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Page25
Connected Mode
URA-PCH
No data to be transmitted or received Monitor PICH, to receive its paging UTRAN only knows which URA (which consists of multiple cells) that UE stays
UTRAN updates UE information only after UE has roamed toother URA
A better way to reduce the resource occupancy and signaling
transmission
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Page26
UE Working Modes and States- Reduce activity further - Avoid unnecessary signaling
RRC Connection
- Reduce activity, DRX, and save power
URA_PCH
CELL_PCH
CELL_DCH- Dedicated channel - Common service, such as voice
CELL_FACH- Common channel - PS service with few data to transmit
IDLE
- Monitor paging channel - Cell re-selection
DEAD
- Scan networks (PLMN) - Camp on a cell
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Page27
Contents1. UTRAN Network Overview 2. Basic Concepts about UTRAN 3. UTRAN Signaling Procedure
Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
Page28
Contents3. UTRAN Signaling Procedure3.1 System Information Broadcast 3.2 Paging 3.3 Call Process 3.4 Handover
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Page29
System Information Broadcast FlowUE NodeB RNC
1. System Information Update Request 2. System Information Update Response 3. System Information 4. System Information 5. System Information
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Page30
Introduction of System Information
MIB:
PLMN tag Scheduling information for SB
(Scheduling Block)
Scheduling information for
SIB (System Information Block)
SB1: scheduling information for
SIB
SB2: scheduling information for
SIB (extended)
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Page31
Introduction of System Information
SIB1: System information for NAS and the timer/counter for UE
SIB2: URA informationSIB3: Parameters for cell selection and cell re-selection SIB4: Parameters for cell selection and cell re-selection while UE
is in connected mode
SIB5: Parameters for the common physical channels of the cell
SIB6: Parameters for the common physical channels of the cell while UE is in connected mode
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Page32
Introduction of System Information
SIB7: uplink interference level and the refreshing timer SIB8: the CPCH static information
SIB9: the CPCH dynamic informationSIB10: information to be used by UEs having their DCH controlled by a DRAC procedure
SIB11: measurement controlling informationSIB12: measurement controlling information in connected mode
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Page33
Introduction of System Information
SIB13: ANSI-41 system information SIB14: the information in TDD mode
SIB15: the position service informationSIB16: the needed pre-configuration information for handover from other RAT to UTRAN
SIB17: the configuration information for TDDSIB18: the PLMN identities of the neighboring cells to be used in shared networks to help with the cell reselection process
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Page34
System Information Block Type 1
System information type 1
The NAS system information
CS domain DRX: K=6, then DRXperiod is 2^k= 2^6= 64TTI=640 ms
PS domain DRX: K=6, then DRX period is 2^k=2^6=64TTI =640 ms
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System Information Block Type 2
System info type 2
URA information
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System Information Block Type 3
The references for cell selection and re-selection
Qhyst2sSintrasearch Sintersearch Sinterratsearch Qqualmin Qrxlemin T reselection Max Allowed UE TX power
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Page37
System Information Block Type 5
The configuration information for the following physical channels
and the counterpart transportchannels
PCCPCH SCCPCH PICH AICH PRACH
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System Information Block Type 7 and 11
System info type 7
Including the UL interference level which is used for open loop power
control
Including the Expiration Time Factor which is used for refreshing the SIB7 periodically
System info type 11
The neighbor cell information for cell re-selection in IDLE mode
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Page39
Contents3. UTRAN Signaling Procedure3.1 System Information Broadcast 3.2 Paging 3.3 Call Process 3.4 Handover
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Page40
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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Page41
Paging Type 1
If UE is in CELL_PCH,URA_PCH or IDLE statethe paging message will be transmitted on PCCH with paging type 1CN PAGING RANAP RANAP RNC1 RNC2 NODEB1.1 NODEB2.1 UE
RANAP
PAGING
RANAP
PCCH: PAGING TYPE 1
PCCH: PAGING TYPE 1
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Page42
Paging Type 2
If UE is in CELL_DCH or CELL_FACH statethe paging message will be transmitted on DCCH with paging type 2CN SRNC UE
PAGING RANAP RANAP
DCCH: PAGING TYPE 2 RRC RRC
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Page43
Contents3. UTRAN Signaling Procedure3.1 System Information Broadcast 3.2 Paging 3.3 Call Process 3.4 Handover
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Page44
Introduction of Call Process
In WCDMA system, a call process includes the following basic signaling flows:
RRC connection flowDirect transfer message flow Authentication flow (optional) Security flow (optional) RAB establish flow Call proceeding NAS signaling before correlative bearer release Correlative bearer release
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RRC Connection Establishment Flow (CCH)UE NodeB SRNC
1. RRC Connection Request
2. RRC Connection Setup
3. RRC Connection Setup Complete
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RRC Connection Establishment Flow (DCH)UE NodeB 1. RRC Connection Request 2. Radio Link Setup Request 3. Radio Link Setup Response 4. ALCAP Iub Data Transport Bearer Setup 5. RRC Connection Setup 6. RRC Connection Setup Complete SRNC
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Page48
Direct Transfer Message FlowUE 1. Initial Direct Transfer 2. Initial UE Message (CM Service Request) 3. Common ID SRNC CN
In Iu interface, radio network layer reports the RANAP
information and NAS information. NAS information istaken as directed message in RANAP information.Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved. Page50
Common ID
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Page51
Authentication and Security FlowUE SRNC 1. Direct Transfer (Authentication Request) 2. Downlink Direct Transfer 3. Uplink Direct Transfer 4. Direct Transfer (Authentication Response) 5. Security Mode Command 6. Security Mode Command 7. Security Mode Command Complete CN
8. Security Mode Command CompletePage52
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Call Setup FlowUE 1. Uplink Direct Transfer 2. Direct Transfer (Setup) 3. Direct Transfer (Call Proceeding) 4. Downlink Direct Transfer 5. RAB Establishment 6. Direct Transfer (Alerting) 7. Downlink Direct Transfer 8. Direct Transfer (Connect) 9. Downlink Direct Transfer 10. Uplink Direct Transfer 11. Direct Transfer (Connect Acknowledge)Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved. Page54
SRNC
CN
RAB Establishment FlowUE NodeB SRNC 1. RAB Assignment Request 2. Iu-CS AAL2 Setup 3. Radio Link Reconfiguration Prepare 4. Radio Link Reconfiguration Ready 5. ALCAP Iub Data Transport Bearer Setup 6. Radio Bearer Setup 7. Radio Link Reconfiguration Commit 8. Radio Bearer Setup Complete 9. RAB Assignment ResponseCopyright 2008 Huawei Technologies Co., Ltd. All rights reserved. Page56
CN
RRC Connection Release Flow (CCH)UE NodeB SRNC
1. RRC Connection Release
2. RRC Connection Release Complete
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RRC Connection Release Flow (DCH)UE NodeB 1. RRC Connection Release 2. RRC Connection Release Complete 3. Radio Link Deletion Request 4. Radio Link Deletion Response 5. ALCAP Iub Data Transport Bearer ReleaseCopyright 2008 Huawei Technologies Co., Ltd. All rights reserved. Page59
SRNC
NAS Signaling (CS)UE MSC MSCPaging RRC and NAS signaling Connection Setup CM Service Request Authentication Request Authentication Response Security Mode Command Security Mode Command Complete Setup Call Proceeding RAB Assignment RRC and NAS signaling Connection Setup Paging Response Authentication Request Authentication Response Security Mode Command Security Mode Command Complete Setup Call Confirmed RAB Assignment Alerting Connect Connect ACK Disconnect Release Release Complete
UE
AlertingConnect Connect ACK Disconnect Release Release Complete
UE Outgoing CallCopyright 2008 Huawei Technologies Co., Ltd. All rights reserved.
UE Terminating CallPage60
UE to UE CS Call Process (1)UE1 NodeB1 RNC1 CN RNC2 NodeB2 UE2 RRC Connection Setup RRC Connection Req RL Setup Req RL Setup Rsp ALCAP Iub Data Transport Bearer Setup RRC Connection Setup RRC Connection Setup Cmp Initial DT Initial UE Message (CM Service Req) DT (Authentication Req) DT (Authentication Rsp) Common ID Security Mode Cmd Security Mode Cmp DT (Setup) NAS Signaling DL DT DT (Call Proceeding) RAB Ass Req Iu-CS AAL2 Setup RL Recfg Prep RAB Establishment RL Recfg Ready ALCAP Iub Data Transport Bearer Setup RB Setup RL Recfg Commit RB Setup Cmp RAB Ass Rsp Paging
NAS Signaling Setup
DL DT UL DT
Authentication and Security Flow Security Mode Cmd Security Mode Cmp
UL DT
Paging Type 1 RRC Connection Req RL Setup Req RL Setup Rsp ALCAP Iub Data Transport Bearer Setup RRC Connection Setup RRC Connection Setup Cmp
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UE to UE CS Call Process (2)UE1 NodeB1 RNC1 CN RNC2 Initial UE Message (Paging Rsp)DT (Authentication Req) DT (Authentication Rsp) Common ID
NodeB2 Initial DT
UE2
DL DT UL DT
Security Mode Cmd Security Mode CmpDT (Setup)
Security Mode Cmd Security Mode Cmp
DT (Call Confirm) RAB Ass Req
DL DT UL DT
Iu-CS AAL2 Setup RL Recfg Prep RL Recfg Ready ALCAP Iub Data Transport Bearer Setup RB Setup RL Recfg Commit RB Setup CmpRAB Ass Rsp
UL DTDT (Alerting) DT (Alerting)
DL DT NAS SignalingDT (Connect)
UL DTDT (Connect)
DL DT UL DT
DT (Connect Acknowlege)
DT (Connect Acknowledge)
DL DT
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UE to UE CS Call Process (3)UE1 NodeB1 UL DT DT (Disconnect) NAS Signaling (Call Release) DT (Release) DL DT UL DT DT (Release Cmp) Iu Release Cmd Iu Release Iu-CS AAL2 Release Iu Release Cmp RRC Connection Rel Req RRC Connection Rel Cmp RRC Connection Release RL Rel Req RL Rel Rsp ALCAP Iub Data Transport Bearer ReleaseIu Release Cmd DT (Release) DT (Release Cmp) DT (Disconnect)
RNC1
CN
RNC2
NodeB2
UE2
DL DT UL DT
DL DT
Iu-CS AAL2 ReleaseIu Release Cmp
RRC Connection Rel Req RRC Connection Rel Cmp RL Rel Req RL Rel Rsp ALCAP Iub Data Transport Bearer Release
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Page63
PS Call ProcessUE1 NodeB1 RRC Connection Request RRC Connection Setup Radio Link Setup Request Radio Link Setup Response ALCAP Iub Data Transport Bearer Setup RRC Connection Setup RRC Connection Setup Complete NAS Signaling Setup Initial Direct Transfer Initial UE Message (Service Request) DT (Authentication Request) DT (Authentication Response) Common ID Security Mode Command Security Mode Command Security Mode Complete Security Mode Complete NAS Signaling (Call Setup) DT (Service Accept) DL DT UL DT RNC1 CN
DL DT UL DT Authentication and Security Flow
DT (PDP Context Request)RAB Assignment Request
Radio Link Reconfiguration Prepare Radio Link Reconfiguration Ready RAB Establishment ALCAP Iub Data Transport Bearer Setup Radio Bearer Setup Radio Link Reconfiguration Commit Radio Bearer Setup Complete RAB Assignment Response DT (PDP Context Accept) DL DT
NAS Signaling (Call Setup)
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Page64
Contents3. UTRAN Signaling Procedure3.1 System Information Broadcast 3.2 Paging 3.3 Call Process 3.4 Handover
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Page65
Concepts about Soft Handover
Soft handover: the signals from different NodeBs are merged in RNC
Softer handover: the signals from different cells, but from the same NodeB are merged in NodeB
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Page66
Soft Handover Flow (Intra-RNC)CN CN CN
SRNC
SRNC
SRNC
NodeB
NodeB
NodeB
NodeB
NodeB
NodeB
Before Handover
During Handover
After Handover
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Page67
Soft Handover FlowCore NetworkRNC (SRNC)
Node BAirBridge AirBridge AirBridge
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Page68
Soft Handover FlowCore NetworkRNC (SRNC)
Node BAirBridge AirBridge AirBridge
Merged in NodeB
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Page69
Soft Handover FlowCore NetworkRNC (SRNC)
Node BAirBridge AirBridge AirBridge
Merged in RNC
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Page70
Soft Handover Flow (SRNC-DRNC)Core Network Serving RNC
Drift RNCNode BAirBridge AirBridge AirBridge
Merged in SRNC
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Page71
Soft Handover Flow (SRNC Relocation)Core Network
RNC
Serving RNCNode BAirBridge AirBridge AirBridge
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Page72
Typical Soft Handover Flow (L3 Signaling)
Soft handover is triggered by 1A/1B/1C or 1D eventUE RRC Connection Setup Procedure Measurement Control Measurement Report (1A/1B/1C or 1D) Active Set Update Active Set Update Complete Measurement Control RNC
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Page73
Soft Handover Flow (Add Branch in AS)UE NodeB(new) Measurement Report Decision to setup new RL RL Setup Req. RL Setup Rsp. DL Synchronization DL Synchronization Active Set Update Active Set Update Complete RNC
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Soft Handover Flow (Del Branch from AS)UE NodeB (old) Measurement Report Decision to delete a RL Active Set Update Active Set Update Complete RL Deletion Req. RL Deletion Rsp. RNC
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Page75
Hard HandoverCN
CN
SRNC
SRNC
NodeB
NodeB
NodeB
NodeB
Before Handover
After Handover
Radio Link can not exist simultaneouslyCopyright 2008 Huawei Technologies Co., Ltd. All rights reserved. Page76
Intra-Frequency Hard Handover
Intra-Frequency hard handover is triggered by 1D eventUE RRC Connection Setup Procedure Measurement Control (Intra-freq) Measurement Report (1D) Decision to setup new RL Physical Channel Reconfiguration Physical Channel Reconfiguration Complete Measurement Control (Intra-Freq) RNC
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Page77
Inter-frequency HandoverUE RRC Connection Setup Procedure Measurement Control (Intra-freq) Measurement Control (2D & 2F) Measurement Report(2D) Decision to enter compress mode Physical Channel Reconfiguration Physical Channel Reconfiguration Complete Measurement Control (Inter-Freq) Measurement Report Decision to setup new RL Physical Channel Reconfiguration Physical Channel Reconfiguration Complete Measurement Control (Intra-freq) RNC
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Page78
CS Domain Inter-RAT Handover Flow (UMTS->GSM)UE RRC Connection Setup Procedure Measurement Control (Intra-freq) Measurement Control (2D & 2F) Measurement Report(2D) Decision to enter compress mode Physical Channel Reconfiguration Physical Channel Reconfiguration Complete Measurement Control (Inter-RAT) Measurement Report (GSM) Decision to handover to GSM Relocation Required Prepare Handover Handover Request Handover Request ACK Prepare Handover Response Relocation Command Inter-System Handover Command Handover Complete Handover Compltet Send END Signal Request Iu Release Command Iu Release Complete RNC 3G MSC 2G MSC BSC
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Page79
PS Domain Inter-RAT Handover Flow (UMTS>GSM & UE in CELL_FACH, CELL_PCH or URA_PCH)UE 1. UE triggers inter-RAT cell reselection SRNC SGSN
2. SRNS context transfer
3. Iu Release Command
4. Iu Release Complete
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Page81
PS Domain Inter-RAT Handover Flow (UMTS->GSM & UE in CELL_DCH)UE NodeB 1. Measurement Report (2D event) 2. Compressed Mode Triggered 3. Measurement Control(Inter-RAT) 4. Measurement Report Handover Desicion 5. Cell Change Order 6. Radio Link Failure 7. SRNS Context Transfer 8. Iu Release Command 9. Iu Release Complete 10. Radio Link Deletion Request 11. Radio Link Deletion ResponseCopyright 2008 Huawei Technologies Co., Ltd. All rights reserved. Page82
SRNC
SGSN
Inter-RAT Handover Flow (GSM->UMTS)UE NodeB RNC 3G MSC 2G MSC Handover Request Prepare Handover Relocation Requeset RL setup requeset RL setup response Relocation Requeset ACK Prepare Handover RSP Handover Command Inter-System to UTRAN Handover Command RL Restore Indicaton Handover Complete Relocation Complete UTRAN Capacity Info UE Capacity Info Enquiry UTRAN Capacity Info Confirm UE Capacity Info UE Capacity Info Confirm Send end signal response Send End Signal Request Clear command Clear complete BSS
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