WCDMA UTRAN Interface and Signaling Procedure ISSUE 1.1

Application Protocol Data Streams TransportUser NetworkPlane TransportUser NetworkPlane Transport NetworkControl Plane Radio Network Layer Signalling Bearers Data Bearers... RNL Control

elements

Contents

1. UTRAN Network Overview

2 Basic Concepts about UTRAN

3 UTRAN Signaling Procedure

The Position of UTRAN in WCDMA Network

Iur

L2/MAC RLC

DC Nt GC

L2/RLC

MAC

RLC RLC

RLC RLC

RLC RLC RLC

Radio Bearers RRC

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)

TransportUser

NetworkPlane

TransportUser

NetworkPlane

Transport NetworkControl Plane

Radio

Network

Layer

Signalling Bearer(s)

Data Bearer(s)

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

Node B RNC

RNC

Iu-CS Interface

Q.2150.1 Q.2630.1

RANAP Iu UP Protocol Layer

Transport Network Layer

Transport Network User Plane

Control Plane User Plane

Transport Network User Plane

Transport Network Control Plane

Radio Network Layer

SSCOP

AAL5 SSCOP SSCF-NNI

AAL2 AAL5

MTP3b MTP3b

SCCP

SSCF-NNI

ATM

Iu-PS Interface

SSCF-NNI SSCOP

AAL5

IP SCTP SCCP

Physical Layer ATM

Transport Network Layer

Transport Network Control Plane

Radio Network Layer

RANAP Iu UP Protocol Layer

Transport Network User Plane

Transport Network User Plane

Iub Interface

Node B Application Part (NBAP)

Transport Network Control Plane

AAL Type 5

SSCF-UNI SSCOP

Q.2630.1 Q.2150.2

Iur Interface

SSCF-NNI SSCOP MTP3-B

AAL5

IP SCTP SCCP

AAL5 STC (Q.2150.1)

MTP3-B

IP SCTP

M3UA

M3UA

Transport Network Layer

Transport Network Control Plane

Radio Network Layer

Transport Network User Plane

Transport Network User Plane

2. Basic Concepts about UTRAN

3 UTRAN Signaling Procedure

 SRNC and DRNC are on a per connection basis between a UE and the UTRAN

 The SRNC handles the connection to one UE, and may borrow radio resources of a ce rtain 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 multip

 The CRNC owns the radio resources of a cell

 Dynamical control of power for dedicated channels, within limits admitted by CRNC, is done

UE Working Modes and States

Idle Mode

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

signalling connection has to be established

 UE camps on a cell

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

 When registered and if the UE wishes to establish an RRC connection, it can do this by initially accessing the network on the control channel of the cell on which it is camped

 UE can receive "paging" message from control channels of the cell.

 It enables the UE to receive cell broadcast services

 The idle mode tasks can be subdivided into three processes:

 PLMN selection and reselection;

 Cell selection and reselection;

 Location registration

Connected Mode

 When at least one signalling connection exists, the UE is in

connected mode and there is normally an RRC connection between

UE and UTRAN The UE position can be known on different levels:

 UTRAN Registration Area (URA) level

The UE position is known on URA level The URA is a set of cells

 Cell level

The UE position is known on cell level Different transport channel types can be used for data transfer:

 Common transport channels (RACH / FACH, DSCH, CPCH)

 Dedicated transport channels (DCH)

Connected Mode

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 need to monitor the FACH for its relative information

 UTRAN knows which cell UE is in

Connected Mode

roams to another cell

UE States

CELL_PCHURA_PCH

IDLE

DEAD - Scanning networks (PLMN)

- ”Camp on” cell

- Monitor paging channel

- cell re-selection

- Dedicated Channel

- Radio bearers Transmission Services

- upper layer Signaling trigger (CN)

- Reduce action ， DTX ， and save power

RRC connection

RNTI - Radio Network

Temporary Identifier

2 Basic Concepts about UTRAN

3. UTRAN Signaling Procedure

Cell Setup

NBAP NBAP NBAP NBAP NBAP

NBAP NBAP NCP: Comm TrCh Setup Rsp

Q.AAL2 Q.AAL2

Q.AAL2

Q.AAL2

Est Req Est Conf

NCP: Audit Rsp

NBAP NBAP NCP: Comm TrCh Setup Req

NBAP NBAP NCP: Comm TrCh Setup Rsp

Q.AAL2

System Information Broadcast Flow

3.BCCH:System Information

1.System Information Update Request

NBAP NBAP

RRC RRC

Introduction of System

Information

MIB ：

Contains PLMN tag and SB (scheduling information block) or the scheduli

ng information for SIB (system info block)

To be used in CELL_DCH state only Changes so often, its decoding is controlled by a timer

Contains 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

System Information Block Type 2

 URA information

System Information Block Type 3

ction and re-selection

System Information Block Type 5

 The configuration information for the following physical channels and the counterpart transport

System Information Block Type

7 and 11

 System info type 7

 Including the UL interference level which is used for open loop power control:

 Preamble_Initial_Power=Primary CPICH DL TX power -

CPICH_RSCP + UL interference + Constant Value

 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.

Pagi ng Type 2

RRC

Paging Caused by CN

is decided by UE mode.

d paging type 2 In other modes, the paging informat ion is type 1 and UE can use DTX method to detectin

g PICH.

Paging Caused by UTRAN

RRC

Pagi ng Type 1

RRC

Introduction of Call Process

basic signaling flows:

 RRC connection flow

 Iu interface signaling flow

 Authentication flow (optional)

 Security flow (optional)

 RAB establish flow

 Call proceeding

 NAS signaling before correlative bearer release

 Correlative bearer release

DCH - FP

Allocate RNTI Select L1 and L2 parameters

RRC RRC

NBAP NBAP

3 Radio Link Setup Response

NBAP NBAP 2 Radio Link Setup Request

RRC RRC 7 CCCH : RRC Connection Set up

Start RX descriptio n

Start TX description

4 ALCAP Iub Data Transport Bearer Setup

9 DCCH : RRC Connection Setup Complete

6 Uplink Synchronisation

NBAP NBAP 8 Radio Link Restore Indication

DCH - FP DCH - FP

DCH - FP

Iu Interface Signaling

Connection Establish

 In Iu interface, radio network layer reports the RANAP

information and NAS information NAS information is

taken as directed message in RANAP information

 And the process of Iu signaling connection is to

establish the Iu interface connection of SCCP between

RANAP

Transport Network User Plane Control Plane

SSCOP AAL5

MTP3b SCCP

SSCF-NNI

Authentication and Security Flow

RRC Connection SetupInitial DT

Security Mode CommandSecurity Mode Command

Security Mode Command

Security Mode Command

RAB Assignment

Common ID

RAB Establishment Flow

NodeB

RANAP RANAP RAB Ass Req

Q.AAL2 Q.AAL2

NBAP NBAP

AAL2 Setup Req

RL Recfg Prep

AAL2 Setup Rep

NBAP NBAP RL Recfg Ready

Q.AAL2 Q.AAL2 AAL2 Setup Req

Q.AAL2 Q.AAL2 AAL2 Setup Rep

RANAP RANAP RAB Ass Rep

NAS Signaling (CS)

CM Service RequestRRC and NAS signaling Connection Setup

Authentication RequestAuthentication ResponseSecurity Mode Command Security Mode Command

RAB Assignment

SetupCall Proceeding

Alerting Connect Connect ACKDisconnectRelease

Paging ResponseAuthentication RequestAuthentication ResponseSecurity Mode Command Security Mode Command

RAB Assignment

SetupCall Confirmed

Alerting Connect Connect ACKDisconnectPagingRRC and NAS signaling Connection Setup

NAS Signaling (PS)

CM Servi ce Accept

Servi ce RequestRRC连接建立

Acti vate PDP Context Req

Acti vate PDP Context Accept

RAB建立安全模式

Deacti vate PDP Context ReqDeacti vate PDP Context Accept

UE Outgoing Call

Servi ce RequestRRC连接建立

Request PDP Context Acti vati onActi vate PDP Context Req

RAB建立安全模式

UE Terminating Call

Pagi ng

Authenti cate and ci pheri ng ReqAuthenti cate and ci pheri ng Rsp 鉴权 Authenti cate and ci pheri ng Req

Authenti cate and ci pheri ng Rsp 鉴权

Acti vate PDP Context Accept

Deacti vate PDP Context ReqDeacti vate PDP Context Accept

RRC connection and NAS signaling

connection establishment RRC connection and NAS signaling

UE to UE (1)

Ori UE NodeB1 RNC1 CN RNC2 NodeB2 Ter UE

1.RRC Connect Setup Req

NBAP NBAP

NBAP NBAP

Q.AAL2 Q.AAL2

Q.AAL2 Q.AAL2

FP FP

FP FP

RRC RRC

RRC RRC

RRC RRC

RANAP RANAP RANAP

31 RL Setup Req

36 AAL2

34 AAL2 Setup Req

25 RAB Ass Req

32 RL Recf g Prep

35 RL Recf g Ready

27 AAL2 Setup Req

29 AAL2 Setup Rsp

IU AAL2 may be established later

注1：协议规定如果发 起安全模式，CN不回 应CM Service Req

早指配：在CC层通信建立后马上进行业务指派 晚指配：在收到Alerting后才进行业务指派

56 Sec mod cmd

57 Sec mod cmd

58 Sec mod cmp

54 UL DT(Authent Rsp)

47 DT(Authent Req)

39 AAL2 Setup Rsp

43 DL Sync

44 UL Sync

51 RL Recf g Commit

48 RB Setup

52 RB Setup Compl ete 53 RAB

FP FP

Q.AAL2 Q.AAL2

NBAP NBAP

RANAP

RANAP

RRC RANAP RRC RRC

RRC

Q.AAL2 Q.AAL2

RRC

RANAP RANAP RANAP

RANAP

RRC RRC

RRC RRC RRC

RRC

RRC

RANAP

RRC RRC RANAP RANAP

FP FP

FP

FP

RANAP

UE to UE (5)

RANAP 64 RAB Ass Req RANAP

NBAP NBAP

70 RL Recf g Ready NBAP

NBAP

69 RL Recf g Prep

72 AAL2 Setup Rsp

71 AAL2 Setup Req

UE to UE (6)

Ori UE NodeB1 RNC1 CN RNC2 NodeB2 Ter UE

NBAP NBAP 76 RL Rcf g

Commit RRC 77 RB Setup Compl et e RRC

RANAP 78 RAB Ass RANAP

Rsp

RANAP 80 DT(Al erti RANAP

ng) RANAP 81 DT(Al erti n RANAP

Connect消息由被叫摘 机后发出

UE to UE (7)

RANAP 92 DT(Di sconne RANAP

ct)

96 DT (Di sconnect )

RRC 97 DL DT RRC RRC 98 UL DT RRC RANAP 99 DT RANAP

UE to UE (8)

Q.AAL2 104 AAL2 Q.AAL2

Rel Req Q.AAL2 105 AAL2 Q.AAL2

114 AAL2 Rel Conf

RRC 107 RRC Conn Rel Req RRC RRC 108 RRC Conn Rel Cmp RRC NBAP 109 RL Rel Req NBAP

NBAP 110 RL Rel Rsp NBAP Q.AAL2 Q.AAL2 Q.AAL2 Q.AAL2

111 AAL2 Rel Req

112 AAL2 Rel Conf

Activate PDP Context from

11 I ni t UE( CM Servi ce Req)

12 DT( Authenti ca and ci pheri ng

RRC RRC

NBAP NBAP

NBAP NBAP

Q.AAL2 Q.AAL2 Q.AAL2

Q.AAL2

FP FP

FP FP

RANAP RANAP

RANAP RANAP

RANAP

RANAP

Activate PDP Context from

28 AAL2 Setup Req

Q.AAL2 Q.AAL2

Q.AAL2 Q.AAL2

FP FP

FP FP

NBAP NBAP

Activate PDP Context from

7 AAL2 Setup Rsp

13 I ni t UE(CM Servi ce Req)

14 DT(Authenti ca and ci pheri ng

RRC RRC

RRC RRC

RRC RRC

RRC RRC

RRC RRC

RRC

RRC

NBAP NBAP

NBAP NBAP

Q.AAL2 Q.AAL2

Q.AAL2 Q.AAL2

FP FP

FP FP

RANAP RANAP

RANAP RANAP

Activate PDP Context from

NBAP NBAP

NBAP NBAP

NBAP NBAP

Q.AAL2 Q.AAL2

Q.AAL2 Q.AAL2

FP FP

FP FP

RANAP RANAP RANAP

RANAP

RANAP RANAP RANAP

RANAP

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.

Node B RNC

AirBridge AirBridge

AirBridge

Soft Handover Flow

Core Network

Node B RNC

AirBridge AirBridge

AirBridge

Merged in NodeB

Soft Handover Flow

Core Network

Merged in RNC

Node B RNC

AirBridge AirBridge

AirBridge

Soft Handover Flow

Core Network

Soft Handover Flow

(SRNC-DRNC)

Merged in SRNC

Node B

AirBridge AirBridge

AirBridge

Serving RNC

Drift RNC

Core Network

Soft Handover Flow (SRNC

Relocation)

Node B

AirBridge AirBridge

AirBridge

Serving RNC RNC

Core Network

NodeB NodeB

SRNC

NodeB NodeB

SRNC

NodeB NodeB

CN

Decision to setup new RL

7 DCCH : Active Set Update Complete 6.DCCH: Active Set Update

DCH-FP 5.Uplink Synchronisation

DCH-FP Start RX description RRC

RRC

RRC RRC

Stop RX and Tx

Before Handover After Handover

SRNC

NodeB NodeB

SRNC

NodeB NodeB

Hard Handover (Intra-RNC)

CN CN

UE Node B Source Node B Target SRNC

8 DCCH : Physical Channel Reconfiguration Complete 6.DCCH : Physical Channel Reconfiguration

1 Radio Link Setup Request

2 Radio Link Setup Response

9 Radio Link Deletion Request

10 Radio Link Deletion Response

3 ALCAP ub Data Transport Bearer Setup

7 Radio Link Failure Indication RRC

RRC

NBAP NBAP

NBAP

RRC RRC

NBAP

NBAP

Decide to handover

Start Rx

Start Tx

DCH-FP

4 Downlink Synchronisation DCH-FP

DCH-FP 5.Uplink Synchronisation

DCH-FP

NBAP

Hard Handover (Intra-RNC)

Cells

Hard Handover with Relocation (CS)

DL Sync

UL Sync

Q.AAL2 Q.AAL2

Q.AAL2 Q.AAL2

DCH-FP DCH-FP DCH-FP

DCH-FP

Inter-System Handover Flow

RL Recf g Commit Physi cal Channel Reconfigurati on cmp

Measurement Control ( I nt erRAT) Measurement Report (GSM)

Rel ocati on Requi red

Rel ocati on Command

Prepare Handover

Handover Request Handover Request ACK Prepare Handover RSP

Handover From UTRAN CMD

Handover Compl ete

I U rel ease command

I U rel ease compl ete RRC Con Rel ease Req

RRC Con Rel ease Cmp

RL Del Req

Inter-System Handover Flow

Rel ocati on Compl ete

Send end si gnal

Forward Handover

update and URA update URA update is only used to make the URA re-selection for the UE which is in

URA_PCH state, and check the RRC connection

in UTRAN This is very helpful for the CN signaling flow.

Thank you

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