owa310020 wcdma ran signaling flow issue 1.22

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WCDMA UTRAN Interface and Signaling Procedure

www.huawei.com

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page2

Contents1. UTRAN Network Overview 2. Basic Concepts about UTRAN 3. UTRAN Signaling Procedure

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page3

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)

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page16

Contents1. UTRAN Network Overview 2. Basic Concepts about UTRAN 3. UTRAN Signaling Procedure

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

RAB, RB and RL

RAB RB UE RL NodeB

RNC

CN

UTRAN

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page19

UE Working Modes and States

Idle Mode Connected Mode

CELL_DCH CELL_FACH CELL_PCH URA_PCH

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page20

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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)

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page22

Connected Mode

Cell-DCH

In active state Communicating via its dedicated channels UTRAN knows which cell UE stays in

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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)

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page35

System Information Block Type 2

System info type 2

URA information

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page36

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page37

System Information Block Type 5

The configuration information for the following physical channels

and the counterpart transportchannels

PCCPCH SCCPCH PICH AICH PRACH

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page38

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page39

Contents3. UTRAN Signaling Procedure3.1 System Information Broadcast 3.2 Paging 3.3 Call Process 3.4 Handover

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page40

Paging Initiation

CN initiated paging

Establish a signaling connection

UTRAN initiated paging

Trigger the cell update procedure Trigger reading of updated system information

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page43

Contents3. UTRAN Signaling Procedure3.1 System Information Broadcast 3.2 Paging 3.3 Call Process 3.4 Handover

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page45

RRC Connection Establishment Flow (CCH)UE NodeB SRNC

1. RRC Connection Request

2. RRC Connection Setup

3. RRC Connection Setup Complete

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page46

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page58

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page61

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page62

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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)

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page64

Contents3. UTRAN Signaling Procedure3.1 System Information Broadcast 3.2 Paging 3.3 Call Process 3.4 Handover

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page66

Soft Handover Flow (Intra-RNC)CN CN CN

SRNC

SRNC

SRNC

NodeB

NodeB

NodeB

NodeB

NodeB

NodeB

Before Handover

During Handover

After Handover

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page67

Soft Handover FlowCore NetworkRNC (SRNC)

Node BAirBridge AirBridge AirBridge

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page68

Soft Handover FlowCore NetworkRNC (SRNC)

Node BAirBridge AirBridge AirBridge

Merged in NodeB

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page69

Soft Handover FlowCore NetworkRNC (SRNC)

Node BAirBridge AirBridge AirBridge

Merged in RNC

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page70

Soft Handover Flow (SRNC-DRNC)Core Network Serving RNC

Drift RNCNode BAirBridge AirBridge AirBridge

Merged in SRNC

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page71

Soft Handover Flow (SRNC Relocation)Core Network

RNC

Serving RNCNode BAirBridge AirBridge AirBridge

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page74

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page83

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