02 WCDMA UTRAN Interface and Signaling Procedure

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Page 1: 02 WCDMA UTRAN Interface and Signaling Procedure

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Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

WCDMA UTRAN Interface and Signaling Procedure

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Page1Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

Objectives

l Upon completion of this course, you will be able to:

p Understand UTRAN interface and structure

p Understand the definitions about UTRAN network elements

p Understand UTRAN signaling procedure

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Page2Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

Contents

1. UTRAN Network Overview

2. Basic Concepts about UTRAN

3. UTRAN Signaling Procedure

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Page3Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

Contents

1. UTRAN Network Overview

2. Basic Concepts about UTRAN

3. UTRAN Signaling Procedure

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Page4Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

UMTS Structure

RNS

RNCRNC

RNS

RNCRNC

Core Network

NodeBNodeB NodeBNodeB NodeBNodeB NodeBNodeB

IuIu IuIu

IurIur

IubIub IubIubIubIub IubIub

UTRAN

User Equipment

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Uu Interface

L3co

ntro

l

cont

rol

cont

rol

cont

rol

Logical Channels

Transport Channels

C-plane signaling U-plane information

PHY

L2/MAC

L1

RLC

DCNtGC

L2/RLC

MAC

RLCRLCRLC

Duplication avoidance

UuS boundary

L2/BMC

control

PDCPPDCP L2/PDCP

DCNtGC

Radio Bearers

RRC

RLCRLCRLC

RLC

BMC

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General Protocol Mode for UTRAN Terrestrial Interfacel The structure is based on the principle that the layers and planes are

logically independent of each other.

Application Protocol

Data Stream(s)

ALCAP(s)

Transport Network

Layer

Physical Layer

Signalling Bearer(s)

Control Plane User Plane

Transport NetworkUser Plane

Transport Network Control Plane

Radio Network

Layer

Signalling Bearer(s)

Data Bearer(s)

Transport NetworkUser Plane

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RNL Control Plane Application Protocol

NBAP Node B Application Part

RANAP Radio Access Network Application Part

RNSAP Radio Network Subsystem Application Part

RRC Radio Resource Control

NodeB

RNC

CN

UE

RANAP

NBAP

RNSAPRRC RNC

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Iu-CS Interface

ALCAPALCAP

Control Plane

Transport NetworkControl Plane

User planeRadioNetworkLayer

Transport NetworkUser Plane

TransportNetworkLayer

A B

RANAP

AAL2 PATH

ATM

Physical Layer

SAAL NNI

SCCPMTP3-B

Iu UP

SAAL NNI

MTP3-B

Transport NetworkUser Plane

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Iu-PS Interface

Control Plane User planeRadioNetworkLayer

Transport NetworkUser PlaneTransport

NetworkLayer

Transport NetworkUser Plane

C

RANAP

ATM

SAAL NNI

SCCP

MTP3-B

Iu UP

AAL Type 5IP

UDP

GTP-U

Physical Layer

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Iub Interface

ALCAPALCAP

Control Plane

Transport NetworkControl Plane

User planeRadioNetworkLayer

Transport NetworkUser Plane

TransportNetworkLayer

Transport NetworkUser Plane

NBAP

AAL2 PATH

ATM

Physical Layer

SAAL UNI

Iub FP

SAAL UNI

NCP CCP

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Iur Interface

ALCAPALCAP

Control Plane

Transport NetworkControl Plane

User planeRadioNetworkLayer

TransportNetworkLayer

A B

RANAP

AAL2 PATH

ATM

Physical Layer

SAAL NNI

SCCPMTP3-B

Iur Data Stream

SAAL NNI

MTP3-B

Transport NetworkUser Plane

Transport NetworkUser Plane

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Contents

1. UTRAN Network Overview

2. Basic Concepts about UTRAN

3. UTRAN Signaling Procedure

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SRNC / DRNC

l SRNC and DRNC are concepts for a connected UE.

l The SRNC handles the connection to one UE, and may borrow radio resources of a certain cell from the DRNC.

l Drift RNCs support the Serving RNC by providing radio resources

l A UE in connection state has at least one and only one SRNC, but can has 0 or multiple DRNCs

CN

SRNC DRNC

Iu Iur

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CRNC

l The CRNC owns the radio resources of a cell

Iub

NodeBCell Cell Cell

NodeB ... ...

Iu

CRNC

CN

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RAB, RB and RL

RAB

RB

RLNodeB

RNC CNUE

UTRAN

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UE Working Modes and States

l Idle Mode

l Connected Mode

p Cell_DCH

p Cell_FACH

p Cell_PCH

p URA_PCH

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Idle Mode

l The UE has no relation to UTRAN, only to CN. For data transfer, a

signalling connection has to be established.

l UE camps on a cell

p It enables the UE to receive system information from the PLMN

p UE can receive paging message from the PICH of a cell

p It enables the UE to receive cell broadcast services.

l The idle mode tasks can be divided into three processes:

p PLMN selection and reselection

p Cell selection and reselection

p Location registration

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Connected Mode

l When UE is in connected mode, there is normally an RRC

connection between UE and UTRAN.

l The UE position can be known on different levels:

p Cell level

p UTRAN Registration Area (URA) level

p Dedicated transport channels (DCH)

p Common transport channels (RACH / FACH, DSCH)

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Connected Mode

l Cell-DCH

p In active state

p Communicating via its dedicated channels

p UTRAN knows which cell UE stays in

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Connected Mode

l Cell-FACH

p In active state

p Few data to be transmitted both in uplink and in downlink. There

is no need to allocate dedicated channel for this UE

p Downlink uses FACH and uplink uses RACH

p UE needs to monitor the FACH for its information

p UTRAN knows which cell the UE stays in

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Connected Mode

l Cell-PCH

p No data to be transmitted or received

p Monitor PICH, to receive its paging

p UTRAN knows which cell the UE stays in

p UTRAN has to update cell information of UE when UE roams to

another cell

p Lower the power consumption of UE

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Connected Mode

l URA-PCH

p No data to be transmitted or received

p Monitor PICH, to receive its paging

p UTRAN only knows which URA (which consists of multiple cells)

that UE stays

p UTRAN updates UE information only after UE has roamed to other

URA

p A better way to reduce the resource occupancy and signaling

transmission

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UE Working Modes and States

CELL_DCH CELL_FACH

CELL_PCHURA_PCH

IDLE

DEAD - Scan networks (PLMN)- Camp on a cell

- Monitor paging channel- Cell re-selection

- Dedicated channel- Common service, such as voice

- Reduce activity, DTX,and save powerRRC Connection

- Common channel- PS service with few

data to transmit

- Reduce activity further- Avoid unnecessary signaling

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Contents

1. UTRAN Network Overview

2. Basic Concepts about UTRAN

3. UTRAN Signaling Procedure

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Contents

3. UTRAN Signaling Procedure

3.1 System Information Broadcast

3.2 Paging

3.3 Call Process

3.4 Handover

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System Information Broadcast Flow

3. BCCH: System Information

1. System Information Update Request

UE Node B RNC

NBAPNBAP

RRCRRC

4. BCCH: System InformationRRCRRC

5. BCCH: System Information RRCRRC

2. System Information Update ResponseNBAPNBAP

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Introduction of System Information

l MIB:

p PLMN tag

p Scheduling information for SB (Scheduling Block)

p Scheduling information for SIB (System Information Block)

l SB1: scheduling information for SIB

l SB2: scheduling information for SIB (extended)

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Introduction of System Information

l SIB1: System information for NAS and the timer/counter for UE

l SIB2: URA information

l SIB3: Parameters for cell selection and cell re-selection

l SIB4: Parameters for cell selection and cell re-selection while UE is in

connected mode

l SIB5: Parameters for the common physical channels of the cell

l SIB6: Parameters for the common physical channels of the cell while

UE is in connected mode

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Introduction of System Information

l SIB7: uplink interference level and the refreshing timer

l SIB8: the CPCH static information

l SIB9: the CPCH dynamic information

l SIB10: information to be used by UEs having their DCH controlled by

a DRAC procedure

l SIB11: measurement controlling information

l SIB12: measurement controlling information in connected mode

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Introduction of System Information

l SIB13: ANSI-41 system information

l SIB14: the information in TDD mode

l SIB15: the position service information

l SIB16: the needed pre-configuration information for handover from

other RAT to UTRAN

l SIB17: the configuration information for TDD

l SIB18: the PLMN identities of the neighboring cells to be used in

shared networks to help with the cell reselection process

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System Information Block Type 1

l System information type 1

p The NAS system information

p CS domain DRX: K=6, then DRX

period is 2^k= 2^6= 64TTI=640 ms

p 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

l System info type 2

p URA information

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System Information Block Type 3

l The references for cell selection and

re-selection

p Qhyst2s

p Sintrasearch

p Sintersearch

p Sinterratsearch

p Qqualmin

p Qrxlemin

p T reselection

p Max Allowed UE TX power

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System Information Block Type 5

l The configuration information for

the following physical channels and

the counterpart transport channels

p PCCPCH

p SCCPCH

p PICH

p AICH

p PRACH

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System Information Block Type 7 and 11

l System info type 7

p Including the UL interference level which is used for open loop power

control

p Including the Expiration Time Factor which is used for refreshing the SIB7

periodically

l System info type 11

p The neighbor cell information for cell re-selection in IDLE mode

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Contents

3. UTRAN Signaling Procedure

3.1 System Information Broadcast

3.2 Paging

3.3 Call Process

3.4 Handover

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Paging Types

l The paging information type which is sent by UTRAN is decided

by UE mode.

p If UE is in the Idle mode, CELL_PCH or URA_PCH states, UTRAN

sends paging type 1, and UE can use DRX method to monitor PICH.

p If UE is in the CELL_FACH or CELL_DCH states,UTRAN sends

paging type 2.

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Paging Caused by CN

Paging Type1 Without RRC Connection

UE NodeB 1 RNC 1

RANAP

NodeB 2 RNC 2

RANAP

MSC

RANAP

Paging

Paging

RRC

RRCRRC

Paging Type 1

UE RNC 1

RANAP

MSC

RANAPPaging

PagingType2 With RRC Connection

RRC Connection Establish

NodeB 1

RRCPaging Type 2

RRC

RANAP

RRC

Paging Type 1

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Paging Caused by UTRAN

UE RNC1NodeB1

RRCPaging Type 1RRC

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Contents

3. UTRAN Signaling Procedure

3.1 System Information Broadcast

3.2 Paging

3.3 Call Process

3.4 Handover

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Introduction of Call Process

l In WCDMA system, a call process includes the following basic

signaling flows:

p RRC connection flow

p Direct transfer message flow

p Authentication flow (optional)

p Security flow (optional)

p RAB establish flow

p Call proceeding

p NAS signaling before correlative bearer release

p Correlative bearer release

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RRC Connection Establishment Flow (DCH)

5. Downlink Synchronization

UE Node B Serving RNC

DCH - FP

Allocate RNTISelect L1 and L2parameters

RRCRRC

NBAPNBAP3. Radio Link Setup Response

NBAPNBAP2. Radio Link Setup Request

RRCRRC7. CCCH: RRC Connection Set up

Start RX

Start TX

4. ALCAP Iub Data Transport Bearer Setup

RRCRRC9. DCCH: RRC Connection Setup Complete

6. Uplink Synchronization

NBAPNBAP8. Radio Link Restore Indication

DCH - FP

DCH - FP

DCH - FP

1. CCCH: RRC Connection Request

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Direct Transfer Message Flow

l In Iu interface, radio network layer reports the RANAP

information and NAS information. NAS information is taken

as directed message in RANAP information.

UE NodeB RNC CN

RRC RRC

SCCP SCCP

SCCP SCCP

Initial DT

Connect Request

Connect Confirm

RRC

RANAP RANAPInitial UE Message

RANAP RANAPCommon ID

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Common ID

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Authentication and Security Flow

UE RNC CN

RRC Connection Setup Initial DT Initial UE Message

(CM Service Request)

DL DT (Authentication Request)DL DT (Authentication Request)

DL DT (Authentication Response)DL DT (Authentication Response)

Common ID

Security Mode CommandSecurity Mode Command

Security Mode Command Complete Security Mode Command Complete

RAB Assignment

UL Direct Transfer (Setup) Direct Transfer (Setup)

Direct Transfer (Call Proceeding)DL Direct Transfer (Call Proceeding)

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RAB Establishment FlowNodeBUE CNRNC

RANAPRANAPRAB Ass Req

Q.AAL2 Q.AAL2

Q.AAL2Q.AAL2

NBAPNBAP

AAL2 Setup Req

RL Recfg Prep

AAL2 Setup Rsp

NBAPNBAPRL Recfg Ready

Q.AAL2Q.AAL2 AAL2 Setup Req

Q.AAL2Q.AAL2 AAL2 Setup Rsp

FPFP DL Sync

FPFPUL Sync

RRC RRCRB Setup

NBAPNBAP RL Recfg Commit

RRC RRCRB Setup Complete

RANAPRANAPRAB Ass Rsp

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NAS Signaling (CS)UE MSC

CM Service Request

RRC and NAS signaling Connection Setup

Authentication Request

Authentication Response

Security Mode Command

Security Mode Command Complete

RAB Assignment

SetupCall Proceeding

Alerting

Connect Connect ACKDisconnect

ReleaseRelease Complete

UE Outgoing Call UE Terminating Call

UEMSC

Paging Response

Authentication Request

Authentication Response

Security Mode Command

Security Mode Command Complete

RAB Assignment

Setup

Call Confirmed

Alerting

Connect

Connect ACKDisconnect

ReleaseRelease Complete

Paging

RRC and NAS signaling Connection Setup

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NAS Signaling (PS)UE SGSN

Service Request

RRC and NAS signaling Connection Setup

Authenticate and Ciphering Req

Security Mode Command

Security Mode Command Complete

RAB Assignment

Service Accept

Activate PDP Context Req

Activate PDP Context Accept

Deactivate PDP Context Req

Deactivate PDP Context Accept

UE Outgoing Call

Authenticate and Ciphering Rsp

UE Terminating Call

UE

Service Request

Authenticate and Ciphering Req

Security Mode Command

Security Mode Command Complete

RAB Assignment

Request PDP Context Activation

Activate PDP Context Req

Activate PDP Context Accept

Deactivate PDP Context Req

Deactivate PDP Context Accept

Paging

RRC and NAS signaling Connection Setup

SGSN

Authenticate and Ciphering Rsp

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UE to UE CS Call Process (1)

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UE to UE CS Call Process (2)

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UE to UE CS Call Process (3)

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UE to UE CS Call Process (4)

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UE to UE CS Call Process (5)

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UE to UE CS Call Process (6)

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UE to UE CS Call Process (7)

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Activate PDP Context from UE (1)

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Activate PDP Context from UE (2)

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Activate PDP Context from Network (1)

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Activate PDP Context from Network (2)

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Contents

3. UTRAN Signaling Procedure

3.1 System Information Broadcast

3.2 Paging

3.3 Call Process

3.4 Handover

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Concepts about Soft Handover

l Soft handover: the signals from different NodeBs are merged in

RNC

l Softer handover: the signals from different cells, but from the

same NodeB are merged in NodeB

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Soft Handover Flow

RNC

AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridge

Core NetworkCore Network

Node B

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Soft Handover Flow

RNC

AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridge

Merged in NodeB

Core NetworkCore Network

Node B

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Soft Handover Flow

Merged in RNC

RNC

AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridge

Core NetworkCore Network

Node B

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Soft Handover Flow (SRNC-DRNC)

Merged in SRNC

Node B

AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridge

Serving RNC

Drift RNC

Core NetworkCore Network

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Soft Handover Flow (SRNC Relocation)

Node B

AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridge

Serving RNC

RNC

Core NetworkCore Network

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Soft Handover Flow (Intra-RNC)

Before Handover After Handover

SRNC

NodeBNodeB

SRNC

NodeBNodeB

SRNC

NodeBNodeB

During Handover

CNCN CN

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Soft Handover Flow (Add Branch in RNC)

DCCH: Active Set Update Complete

DCCH: Active Set Update

UE NodeB (new) SRNC

NBAPRadio Link Setup RequestNBAP

NBAPRadio Link Setup Response

NBAP

ALCAP Iub Data Transport Bearer Setup

Start RX description

DCH-FPDownlink Synchronisation

DCH-FP

DCH-FPUplink SynchronisationDCH-FP

Start TX description

RRC

RRC

RRC

RRC

Decision to setupnew RL

RRC RRCDCCH: Measurement Report

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Soft Handover Flow (Del Branch in RNC)

DCCH: Active Set Update Complete

DCCH: Active Set Update

UE NodeB (old) SRNC

NBAPRadio Link Deletion Request

NBAP

NBAPRadio Link Deletion Response

NBAP

RRC

RRC

RRC

RRC

Stop Rx and Tx

Decision to deletea RL

ALCAP Iub Transport Bearer release

RRC RRCDCCH: Measurement Report

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Inter-frequency Handover (Intra-RNC)

Before Handover After Handover

Radio Link can not exist simultaneously

SRNC

NodeBNodeB

SRNC

NodeBNodeB

CNCN

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Inter-frequency Handover (Intra-RNC)

8. DCCH : Physical Channel Reconfiguration Complete

6.DCCH : Physical Channel Reconfiguration

9. Radio Link Deletion Request

10. Radio Link Deletion Response

7. Radio Link Failure Indication

UE Target NodeB SRNC

NBAP1. Radio Link Setup RequestNBAP

NBAP2. Radio Link Setup ResponseNBAP

3 ALCAP Iub Data Transport Bearer Setup

Start RX description

DCH-FP4. Downlink SynchronisationDCH-FP

DCH-FP5.Uplink SynchronisationDCH-FP

Start TX description

RRC

RRC

RRC

RRC

Decision to setup new RL

NBAPNBAP

Source NodeB

NBAPNBAP

NBAPNBAP

11. ALCAP Iub Data Transport Bearer Release

RRC RRCDCCH: Measurement Report

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Inter-RAT Handover Flow (UMTS->GSM)

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Inter-RAT Handover Flow (GSM->UMTS)

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