owa310020 wcdma ran signaling flow issue 1.21

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

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved. Page1

Contents1. UTRAN Network Overview

2. Basic Concepts about UTRAN

3. UTRAN Signaling Procedure


UMTS Network Structure

RNS

RNC

RNS

RNC

Core Network

Iu-CS Iu-PS

Iur

CNCS PS

Iu-CSIu-PS

CSPS


RNC RNC

NodeB NodeB NodeB NodeB

Iub IubIub IubUTRAN

UEUu

Uu Interface

L3

c

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t

r

o

l

c

o

n

t

r

o

l

c

o

n

t

r

o

l

c

o

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r

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l

C-plane signaling U-plane information

DCNtGCDuplication avoidance

UuS boundary

control

PDCPPDCP L2/PDCP

DCNtGC

RRCradio bearer


PHY

L2/MAC

L1

RLC L2/RLC

MAC

RLCRLCRLC

L2/BMC

PDCPPDCP L2/PDCP

RLCRLCRLCRLC

BMC

logical channel

transport channel

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.

Application Protocol

Data Stream(s)

Control Plane User PlaneRadio Network

Layer


ALCAP(s)

Transport Network

Layer

Physical Layer

Signaling Bearer(s)

Transport NetworkUser Plane

Transport Network Control Plane

Signaling Bearer(s)

Data Bearer(s)


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.

Application Protocol

Data Stream(s)

Control Plane User PlaneRadio Network

Layer


ALCAP(s)

Transport Network

Layer

Physical Layer

Signaling Bearer(s)


Transport Network Control Plane

Signaling Bearer(s)

Data Bearer(s)


RNL Control Plane Application Protocol

RNC

CN

UE

RANAP

NBAP

RNSAPRRC RNC


NBAP Node B Application PartRANAP Radio Access Network Application PartRNSAP Radio Network Subsystem Application PartRRC Radio Resource Control

NodeB

NBAP

Iu-CS Interface (based on ATM)

ALCAP

Control Plane

Transport NetworkControl Plane

User planeRadioNetworkLayer


Transport

RANAP Iu UP



ALCAPTransportNetworkLayer

A B

AAL2 PATH

ATM

Physical Layer

SAAL NNI

SCCPMTP3-B

SAAL NNI

MTP3-B

Iu-CS Interface (based on IP)Control Plane User planeRadio

NetworkLayer


Transport

RANAP Iu UP



TransportNetworkLayer

IP

Physical Layer

IP

SCTP

DATA LINK DATA LINK

M3UASCCP RTP/RTCP

UDP

Iu-PS Interface (based on ATM)Control Plane User planeRadio

NetworkLayer

Transport NetworkUser PlaneTransport

Network


RANAP

SCCP

Iu UP


NetworkLayer

C

ATM

SAAL NNI

SCCP

MTP3-B

AAL Type 5IP

UDPGTP-U

Physical Layer

Iu-PS Interface (based on IP)Control Plane User planeRadio

NetworkLayer


Transport

RANAP Iu UP




IP

Physical Layer

IP

SCTP

DATA LINK DATA LINK

M3UASCCP

GTP-U

UDP

Iub Interface (based on ATM)Control Plane



Transport NetworkTransport

NBAP Iub FP

NCP CCP


ALCAP Transport NetworkUser PlaneTransportNetworkLayer


AAL2 PATH

ATM

Physical Layer

SAAL UNI SAAL UNI

Iub Interface (based on IP)Control Plane User planeRadio

NetworkLayer

Transport NetworkTransport

NBAP Iub FP

NCP CCP





IP

DATA LINK

Physical Layer

IP

DATA LINK

SCTP UDP

Iur Interface (based on ATM)

ALCAP

Control Plane



Transport

RNSAP Iur Data Stream




ALCAPTransportNetworkLayer

A B

AAL2 PATH

ATM

Physical Layer

SAAL NNI

SCCPMTP3-B

SAAL NNI

MTP3-B

Iur Interface (based on IP)Control Plane User planeRadio

NetworkLayer


Transport

RNSAP Iur Data Stream




IP

Physical Layer

IP

SCTP

DATA LINK DATA LINK

M3UASCCP

UDP

SRNC / DRNCCN

SRNC DRNC

Interface


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 DRNCs

Data

RAB, RB and RL

RAB

RBRNC CNUE


RLNodeB

UE

UTRAN

UE Working Modes and States Idle Mode

Connected Mode

CELL_DCH

CELL_FACH


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


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 multiple cells) that UE stays


cells) 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

- Reduce activity, DRX, and save powerRRC Connection

- Reduce activity further- Avoid unnecessary signaling


CELL_DCH CELL_FACH

IDLE

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

- Monitor paging channel- Cell re-selection

- Dedicated channel- Common service, such as voice

- Common channel- PS service with few

data to transmit

Contents3. UTRAN Signaling Procedure

3.1 System Information Broadcast

3.2 Paging

3.3 Call Process


3.4 Handover

System Information Broadcast FlowUE RNCNodeB

1. System Information Update

Request

2. System Information Update

Response


Response

3. System Information



Introduction of System InformationMIB:

PLMN tag

Scheduling information for SB (Scheduling Block) Scheduling information for


Scheduling information for SIB (System Information Block)

SB1: scheduling information for SIB

SB2: scheduling information for SIB (extended)

Introduction of System Information 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


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

Introduction of System Information SIB7: uplink interference level and the refreshing timer

SIB8: the CPCH static information

SIB9: the CPCH dynamic information

SIB10: information to be used by UEs having their DCH controlled by a DRAC procedure


by a DRAC procedure

SIB11: measurement controlling information

SIB12: measurement controlling information in connected mode

Introduction of System Information 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


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 1 System information type 1

The NAS system information

CS domain DRX: K=6, then DRX period is 2^k= 2^6= 64TTI=640 ms

PS domain DRX: K=6, then DRX


PS domain DRX: K=6, then DRX period is 2^k=2^6=64TTI =640 ms

System Information Block Type 2 System info type 2

URA information


System Information Block Type 3 The references for cell selection

and re-selection Qhyst2s Sintrasearch

Sintersearch


Sintersearch

Sinterratsearch

Qqualmin Qrxlemin T reselection

Max Allowed UE TX power

System Information Block Type 5 The configuration information for

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



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 the cell update procedure

Trigger reading of updated system information

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 RNC1 RNC2 NODEB1.1 NODEB2.1 UE

RANAPRANAP

PAGING


RANAP RANAP

PCCH: PAGING TYPE 1

PAGING

PCCH: PAGING TYPE 1

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


RANAPRANAP

PAGING

RRCRRC

DCCH: PAGING TYPE 2



3.2 Paging

3.3 Call Process


3.4 Handover

Introduction of Call Process In WCDMA system, a call process includes the following basic

signaling flows: RRC connection flow

Direct transfer message flow

Authentication flow (optional)


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)


RRC Connection Establishment Flow (DCH)UE SRNCNodeB

2. Radio Link Setup Request

Radio Link Setup Response

1. RRC Connection Request


3. Radio Link Setup Response

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.

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

Authentication and Security FlowUE CNSRNC


Request)



4 Direct Transfer (Authentication



Response)




Complete8. Security Mode Command

Complete

Call Setup FlowUE CNSRNC

2. Direct Transfer (Setup)



3. Direct Transfer (Call Proceeding)

5 RAB Establishment


6. Direct Transfer (Alerting)

5. RAB Establishment


8. Direct Transfer (Connect)


10. Uplink Direct Transfer11. Direct Transfer (Connect

Acknowledge)

RAB Establishment Flow


RRC Connection Release Flow (CCH)


RRC Connection Release Flow (DCH)


NAS Signaling (CS)UE MSC

CM Service RequestRRC and NAS signaling Connection Setup

Authentication Request

Authentication Response

Security Mode Command Security Mode Command Complete

UEMSC

Paging Response

Authentication RequestAuthentication ResponseSecurity Mode Command

Security Mode Command Complete

Paging

RRC and NAS signaling Connection Setup


RAB Assignment

SetupCall Proceeding

Alerting Connect

Connect ACKDisconnect

ReleaseRelease Complete

UE Outgoing Call UE Terminating Call

Security Mode Command Complete

RAB Assignment

SetupCall Confirmed

Alerting Connect

Connect ACKDisconnect

ReleaseRelease Complete

UE to UE CS Call Process (1)UE1 RNC1NodeB1

RRC Connection Req

RRC Connection Setup

CN NodeB2RNC2 UE2

RL Setup Req

RL Setup Rsp

ALCAP Iub Data

Transport 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

RRC Connection

Setup

NAS Signaling

Setup

Authentication

and Security Flow


Security Mode

CmdSecurity Mode Cmd

Security Mode

Cmp

Security Mode Cmp

UL DT

DT (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



RRC Connection Setup Cmp

ALCAP Iub Data


RB Setup

RL Recfg

CommitRB Setup Cmp

RAB Ass Rsp

NAS Signaling

RAB

Establishment

UE to UE CS Call Process (2)UE1 RNC1NodeB1 CN NodeB2RNC2 UE2

Security Mode

Cmd

Initial DTInitial UE

Message

(Paging Rsp)

Common ID

DL DT

UL DTDT

(Authentication

Rsp)

Security Mode Cmd

Security Mode CmpSecurity Mode

Cmp

DT

(Authentication

Req)

DT (Setup)

DL DT

UL DTDT (Call

Confirm)

RAB Ass Req


Iu-CS AAL2 Setup

DL DT

RL Recfg Prep

RL Recfg

Ready

ALCAP Iub Data


RB Setup

RB Setup Cmp

RL Recfg

Commit

RAB Ass Rsp

UL DT

DT (Alerting)

DT (Alerting)

DL DT

DL DT

DT (Connect)

DT (Connect)

UL DTDT (Connect

Acknowlege) DT (Connect

Acknowledge)

UL DT

NAS

Signaling

UE to UE CS Call Process (3)UE1 RNC1NodeB1 CN NodeB2RNC2 UE2

Iu-CS AAL2 Release

DL DT

DT (Release)

DT

(Disconnect)

UL DT

DT (Release)

DT

(Disconnect)

DT (Release

Cmp)

DL DT

UL DTDT (Release

Cmp) UL DT

DL DT

Iu Release

Cmd

NAS Signaling

(Call Release)

Iu Release


RL Rel Req

RL Rel Rsp

ALCAP Iub Data

Transport Bearer

Release

RRC Connection Rel Req

RRC Connection Rel Cmp

Iu Release

Cmp

Iu Release

Cmp

Iu Release

Cmd

Iu-CS AAL2 ReleaseRRC Connection Rel Req

RRC Connection Rel Cmp

RL Rel Req

RL Rel Rsp

ALCAP Iub Data

Transport Bearer

Release

RRC Connection

Release

PS Call ProcessUE1 RNC1NodeB1

RRC Connection Request


CN

Radio Link Setup RequestRadio Link Setup Response

ALCAP Iub Data Transport

Bearer Setup

RRC Connection Setup Complete

Initial Direct TransferInitial UE Message

(Service Request)

DT (Authentication

Request)DL DT

UL DTDT (Authentication

Response)

Common ID

Security Mode CommandSecurity Mode Command

Security Mode Complete

RRC Connection

Setup

NAS Signaling

Setup

Authentication

and Security Flow




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

NAS Signaling

(Call Setup)

RAB

Establishment

DT (Service Accept)

DT (PDP Context

Accept)DL DT

NAS Signaling

(Call Setup)



3.2 Paging

3.3 Call Process


3.4 Handover

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


Soft Handover Flow (Intra-RNC)

SRNC SRNCSRNC

CNCN CN


Before Handover After Handover

NodeBNodeB NodeBNodeBNodeBNodeB

During Handover

Soft Handover Flow

RNC (SRNC)

Core NetworkCore Network


AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridgeNode B

Soft Handover Flow

RNC (SRNC)



AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridge

Merged in NodeB

Node B

Soft Handover Flow

RNC (SRNC)



Merged in RNC

AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridgeNode B

Soft Handover Flow (SRNC-DRNC)

Serving RNC

Drift RNC



Merged in SRNC

Node B

AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridge

Soft Handover Flow (SRNC Relocation)

Serving RNC

RNC



Node B

AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridge

Typical Soft Handover Flow (L3 Signaling) Soft handover is triggered by 1A/1B/1C or 1D event

Measurement Control

RRC Connection Setup Procedure

RNCUE


Measurement Report (1A/1B/1C or 1D)

Measurement Control

Active Set Update

Active Set Update Complete

Measurement Control

Soft Handover Flow (Add Branch in AS)


Soft Handover Flow (Del Branch from AS)


Hard Handover

SRNC SRNC

CNCN


Before Handover After Handover

Radio Link can not exist simultaneously

NodeBNodeB NodeBNodeB

Intra-Frequency Hard Handover Intra-Frequency hard handover is triggered by 1D event

Measurement Control (Intra-freq)


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

Decision to enter

compress mode


Measurement Control (2D & 2F)


Measurement Control (Inter-Freq)



Measurement Report

Decision to

setup new RL




CS Domain Inter-RAT Handover Flow (UMTS->GSM)


PS Domain Inter-RAT Handover Flow (UMTS->GSM & UE in CELL_FACH, CELL_PCH or URA_PCH)


PS Domain Inter-RAT Handover Flow (UMTS->GSM & UE in CELL_DCH)


Inter-RAT Handover Flow (GSM->UMTS)


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owa310020 wcdma ran signaling flow issue 1.21

Documents

huawei technologies

utran network elements

utran network overview2

utran terrestrial interface

wcdma utran interface

basic concepts