wcdma ran signaling flow

8/12/2019 WCDMA RAN Signaling Flow

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

WCDMA UTRANInterface and SignalingProcedure



Copyright © 2008 Huawei Technologies Co., Ltd. All rights reserved. Page2

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




Contents

1. UTRAN Network Overview

2. Basic Concepts about UTRAN

3. UTRAN Signaling Procedure




Uu Interface

L3

c o n t r o l

c

o n t r o l

c

o n t r o l

c o n t r o l

C-plane signaling U-plane information

PHY

L2/MAC

L1

RLC

DCNtGC

L2/RLC

MAC

RLCRLC

RLC

Duplication avoidance

UuS boundary

L2/BMC

control

PDCP

PDCP L2/PDCP

DCNtGC

RRC

RLC

RLC

RLC

RLC

BMC

radio bearer

logical channel

transport channel




RNL Control Plane ApplicationProtocol

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

RNSAP RRC RNC




Iu-CS Interface (based on ATM)

ALCAP

Control Plane

Transport Network

Control Plane

User planeRadioNetwork

Layer

Transport Network

User PlaneTransport

Network

LayerA B

RANAP

AAL2 PATH

ATM

Physical Layer

SAAL NNI

SCCP

MTP3-B

Iu UP

SAAL NNI

MTP3-B

Transport Network

User Plane




Iu-CS Interface (based on IP)

Control Plane User planeRadioNetwork

Layer

Transport Network

User PlaneTransport

Network

Layer

RANAP

IP

Physical Layer

IP

SCTP

Iu UP

Transport Network

User Plane

DATA LINK DATA LINK

M3UA

SCCPRTP/RTCP

UDP




Iu-PS Interface (based on ATM)

Control Plane User planeRadio

Network

Layer

Transport Network

User PlaneTransportNetwork

Layer

Transport Network

User Plane

C

RANAP

ATM

SAAL NNI

SCCP

MTP3-B

Iu UP

AAL Type 5

IP

UDP

GTP-U

Physical Layer




Iu-PS Interface (based on IP)

Control Plane User planeRadioNetwork

Layer

Transport Network

User PlaneTransport

Network

Layer

RANAP

IP

Physical Layer

IP

SCTP

Iu UP

Transport Network

User Plane

DATA LINK DATA LINK

M3UA

SCCPGTP-U

UDP




Iub Interface (based on ATM)

ALCAP

Control Plane

Transport Network

Control Plane

User planeRadio

Network

Layer

Transport Network

User Plane

Transport

Network

Layer

Transport Network

User Plane

NBAP

AAL2 PATH

ATM

Physical Layer

SAAL UNI

Iub FP

SAAL UNI

NCP CCP




Iub Interface (based on IP)

Control Plane User planeRadio

Network

Layer

Transport Network

User Plane

Transport

Network

Layer

Transport Network

User Plane

NBAP

IP

DATA LINK

Physical Layer

IP

Iub FP

NCP CCP

DATA LINK

SCTP UDP




Iur Interface (based on ATM)

ALCAP

Control Plane

Transport Network

Control Plane

User planeRadioNetwork

Layer

Transport

Network

LayerA B

RNSAP

AAL2 PATH

ATM

Physical Layer

SAAL NNI

SCCP

MTP3-B

Iur Data

Stream

SAAL NNI

MTP3-B

Transport Network

User Plane

Transport Network

User Plane




Contents







RAB, RB and RL

RAB

RB

RLNodeB

RNC CNUE

UTRAN




UE Working Modes and States

Idle Mode

Connected Mode

CELL_DCH

CELL_FACH

CELL_PCH

URA_PCH




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




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)




Connected Mode

Cell-DCH

In active state

Communicating via its dedicated channels

UTRAN knows which cell UE stays in




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




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




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 multiplecells) that UE stays

UTRAN updates UE information only after UE has roamed to

other URA

A better way to reduce the resource occupancy and

signaling transmission




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, DRX,and save powerRRC Conn ect ion

- Common channel- PS service with few

data to transmit

- Reduce activity further- Avoid unnecessarysignaling




Contents







Contents


3.1 System Information Broadcast

3.2 Paging

3.3 Call Process

3.4 Handover




System Information Broadcast Flow

UE RNC NodeB

1. System Information Update

Request

2. System Information Update

Response

3. System Information






Introduction of System Information

MIB:

PLMN tag

Scheduling information for

SB (Scheduling Block)

Scheduling information for

SIB (System Information

Block)

SB1: scheduling information forSIB

SB2: scheduling information for

SIB (extended)





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

SIB2: URA information

SIB3: 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





SIB13: ANSI-41 system information

SIB14: the information in TDD mode

SIB15: the position service information

SIB16: the needed pre-configuration information for handover

from other RAT to UTRAN

SIB17: the configuration information for TDD

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

in shared networks to help with the cell reselection process




System Information Block Type 2

System info type 2

URA information





The references for cell selectionand re-selection

Qhyst2s

Sintrasearch

Sintersearch

Sinterratsearch

Qqualmin

Qrxlevmin

T reselection

Max Allowed UE TX power





The configuration informationfor the following physical

channels and the counterpart

transport channels

PCCPCH

SCCPCH

PICH

AICH

PRACH




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




Contents



3.2 Paging

3.3 Call Process

3.4 Handover




Paging Initiation

CN initiated paging

Establish a signaling connection

UTRAN initiated paging

Trigger the cell update procedure

Trigger reading of updated system information




Paging Type 1

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

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




Contents



3.2 Paging

3.3 Call Process

3.4 Handover




Introduction of Call Process

In WCDMA system, a call process includes the following basicsignaling flows:

RRC connection flow

Direct transfer message flow

Authentication flow (optional)

Security flow (optional)

RAB establish flow

Call proceeding

NAS signaling before correlative bearer release

Correlative bearer release




RRC Connection Establishment Flow(CCH)

UE SRNC NodeB

1. RRC Connection Request

2. RRC Connection Setup

3. RRC Connection Setup Complete




RRC Connection Establishment Flow(DCH)

UE SRNC NodeB

2. Radio Link Setup Request

3. Radio Link Setup Response

1. RRC Connection Request

5. RRC Connection Setup

4. ALCAP Iub Data Transport

Bearer Setup

6. RRC Connection Setup Complete




Direct Transfer Message Flow

In Iu interface, radio network layer reports the RANAP

information and NAS information. NAS information is

taken as directed message in RANAP information.

UE CNSRNC

2. Initial UE Message (CM

Service Request)

1. Initial Direct Transfer

3. Common ID




Common ID




Authentication and Security FlowUE CNSRNC

1. Direct Transfer (Authentication

Request)

2. Downlink Direct Transfer

3. Uplink Direct Transfer

4. Direct Transfer (Authentication

Response)

5. Security Mode Command



Complete8. Security Mode Command

Complete




Call Setup FlowUE CNSRNC

2. Direct Transfer (Setup)

1. Uplink Direct Transfer


3. Direct Transfer (Call Proceeding)

6. Direct Transfer (Alerting)

5. RAB Establishment


8. Direct Transfer (Connect)


10. Uplink Direct Transfer 11. Direct Transfer (Connect

Acknowledge)




RAB Establishment FlowUE SRNC NodeB

3. Radio Link

Reconfiguration Prepare

4. Radio LinkReconfiguration Ready


Bearer Setup

8. Radio Bearer Setup Complete

CN

9. RAB Assignment

Response

2. Iu-CS AAL2 Setup

1. RAB AssignmentRequest

6. Radio Bearer Setup

7. Radio LinkReconfiguration Commit




RRC Connection Release Flow (CCH)

UE SRNC NodeB

1. RRC Connection Release

2. RRC Connection Release Complete




RRC Connection Release Flow (DCH)

UE SRNC NodeB

1. RRC Connection Release

3. Radio Link Deletion

Request

4. Radio Link Deletion

Response


Bearer Release

2. RRC Connection Release Complete




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

Setup

Call Proceeding

Alerting

Connect

Connect ACK

Disconnect

Release

Release Complete

UE Outgoing Call UE Terminating Call

UEMSC

Paging Response

Authentication Request

Authentication Response


Security Mode Command Complete

RAB Assignment

Setup

Call Confirmed

Alerting

Connect

Connect ACK

Disconnect

Release

Release Complete

PagingRRC and NAS signaling Connection Setup




UE to UE CS Call Process (1)UE1 RNC1 NodeB1

RRC Connection Req

RRC Connection Setup

CN NodeB2RNC2 UE2

RL Setup ReqRL Setup Rsp

ALCAP Iub DataTransport Bearer Setup


Cmp

Initial DT Initial UE

Message (CM

Service Req)

DT

(Authentication

Req)DL DT

UL DT DT

(Authentication

Rsp)

Common ID

Security Mode

CmdSecurity Mode Cmd

Security Mode

Cmp

Security Mode Cmp

UL DTDT (Setup)

DT (Call

Proceeding)DL DT

RAB Ass Req

Iu-CS AAL2 Setup

RL Recfg Prep

RL Recfg

Ready

PagingPaging Type 1

RRC Connection Req

RL Setup Req

RL Setup Rsp

ALCAP Iub Data

Transport Bearer Setup


RRC Connection Setup Cmp

ALCAP Iub Data

Transport Bearer Setup

RB Setup

RL Recfg

CommitRB Setup Cmp

RAB Ass Rsp

RRC Connection

Setup

NAS Signaling

Setup

Authentication

and Security Flow

NAS Signaling

RAB

Establishment




UE to UE CS Call Process (3)UE1 RNC1 NodeB1 CN NodeB2RNC2 UE2

Iu-CS AAL2 Release

DL DT

RL Rel Req

RL Rel Rsp

ALCAP Iub Data

Transport Bearer

Release

DT (Release)

DT

(Disconnect)

UL DT

DT (R elease)

DT

(Disconnect)

DT (R elease

Cm p)

RRC Connection Rel Req

RRC Connection Rel Cmp

Iu R elease

Cmp

DL DT

UL DTDT (Release

Cmp) UL DT

DL DT

Iu Release

Cmd

Iu Release

Cmp

Iu R elease

Cmd

Iu-CS AAL2 ReleaseRRC Connection Rel Req

RRC Connection Rel Cmp

RL Rel Req

RL Rel Rsp

ALCAP Iub Data

Transport Bearer

Release

NAS Signaling

(Call Release)

Iu Release

RRC Connection

Release




PS Call ProcessUE1 RNC1 NodeB1

RRC Connection Request


CN

Radio Link Setup RequestRadio Link Setup Response

ALCAP Iub Data TransportBearer Setup

RRC Connection Setup Complete

Initial Direct Transfer Initial UE Message

(Service Request)

DT (Authentication

Request)DL DT

UL DTDT (Authentication

Response)

Common ID



Security Mode Complete

Security Mode Complete

UL DTDT (PDP Context

Request)

DL DT

RAB Assignment

Request

Radio Link Reconfiguration

Prepare


Ready

ALCAP Iub Data Transport

Bearer Setup

Radio Bearer Setup


Commit

Radio Bearer Setup CompleteRAB Assignment

Response

RRC Connection

Setup

NAS Signaling

Setup

Authentication

and Security Flow

NAS Signaling

(Call Setup)

RAB

Establishment

DT (Service Accept)

DT (PDP Context

Accept)DL DT

NAS Signaling

(Call Setup)




Contents



3.2 Paging

3.3 Call Process

3.4 Handover




Concepts about Soft Handover

Soft handover: the signals from different NodeBs aremerged in RNC

Softer handover: the signals from different cells, but from

the same NodeB are merged in NodeB




Soft Handover Flow

RNC (SRNC)

AirBridge

AirBridge

AirBridge

Core Network

Node B




Soft Handover Flow

RNC (SRNC)

AirBridge

AirBridge

AirBridge

Merged in NodeB

Core Network

Node B




Soft Handover Flow

Merged in RNC

RNC (SRNC)

AirBridge

AirBridge

AirBridge

Core Network

Node B




Soft Handover Flow (SRNC-DRNC)

Merged in SRNC

Node B

AirBridge

AirBridge

AirBridge

Serving RNC

Drift RNC

Core Network

Soft Handover Flow (SRNC




Soft Handover Flow (SRNCRelocation)

Node B

AirBridge

AirBridge

AirBridge

Serving RNC

RNC

Core Network




Soft Handover Flow (Add Branch in AS)

Measurement Report

RNCUE

Active Set Update

Active Set Update Complete

NodeB(new)

RL Setup Req.

Decision to

setup new RL

RL Setup Rsp.

DL Synchronization

DL Synchronization




Soft Handover Flow (Del Branch from AS)

Measurement Report

RNCUE

Active Set Update

Active Set Update Complete

NodeB (old)

RL Deletion Req.

Decision to

delete a RL

RL Deletion Rsp.




Hard Handover

Before Handover After Handover

Radio Link can not exist simultaneously

SRNC

NodeB NodeB

SRNC

NodeB NodeB

CN CN




Intra-Frequency Hard Handover

Intra-Frequency hard handover is triggered by 1D event

Measurement Control (Intra-freq)

RRC Connection Setup Procedure

RNCUE

Measurement Control (Intra-Freq)

Physical Channel Reconfiguration

Physical Channel Reconfiguration Complete

Decision to

setup new RL

Measurement Report (1D)




Inter-frequency Handover

Measurement Report(2D)



RNCUE

Measurement Control (Inter-Freq)

Decision to enter

compress mode



Measurement Report

Decision to

setup new RL

Measurement Control (2D & 2F)




CS Domain Inter-RAT Handover Flow




(UMTS->GSM)

Measurement Report(2D)



RNCUE

Measurement Control (Inter-RAT)

Decision to enter

compress mode



Measurement Report (GSM)

Decision tohandover to GSM

Measurement Control (2D & 2F)

Relocation Required

2G MSC3G MSC

Prepare Handover

BSC

Handover Request

Handover Request ACK

Prepare Handover

ResponseRelocation Command

Inter-System Handover Command

Handover Complete

Handover CompltetSend END

Signal RequestIu Release Command

Iu Release Complete

PS Domain Inter-RAT Handover Flow (UMTS-




UE SGSNSRNC

3. Iu Release Command

4. Iu Release Complete

2. SRNS context transfer

1. UE triggers

inter-RAT cell

reselection

>GSM & UE in CELL_FACH, CELL_PCH orURA_PCH)




Inter-RAT Handover Flow (GSM->UMTS)UE NodeB RNC 3G MSC 2G MSC BSS

RL setup requeset

RL setup response

RL Restore Indicaton

Handover Complete

UTRAN Capacity Info

UE Capacity Info Enquiry

Relocation Requeset

Prepare Handover

Handover Request

Handover Command

Send End Signal

Request

Inter-System to UTRAN Handover Command

Clear command

Clear complete

UTRAN Capacity Info Confirm

UE Capacity Info Confirm

Relocation Requeset

ACKPrepare Handover RSP

Relocation Complete

Send end signal

responseUE Capacity Info



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