3 WCDMA UTRAN Interface and Signaling Procedure ISSUE 1.21

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 Copyright © 2008 Huawei Technologies Co., Ltd. All rights reserved. Page0 Revision Record Course Code Product Product Version Course Version ISSUE OWA10 WRAN ALL 1.20 Developer/Modifier Time Approver New/Update SUNT AN 2009-2-2 LIANGJIE  Add notes GUOY ANG 2009-04-15 LIANGJIE BUG correction GUOY ANG 2009-12 LIANGJIE BUG correction Don¶t Print This Page

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Revision Record

Course Code ProductProduct

VersionCourse Version ISSUE

OWA10 WRAN ALL 1.20

Developer/Modifier Time Approver New/Update

SUNTAN 2009-2-2 LIANGJIE  Add notes

GUOYANG 2009-04-15 LIANGJIE BUG correction

GUOYANG 2009-12 LIANGJIE BUG correction

Don¶t Print This Page

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www.huawei.com

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

WCDMA UTRAN Interface

and Signaling Procedure

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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

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Contents

1. UTRAN Network Overview

2. Basic Concepts about UTRAN

3. UTRAN Signaling Procedure

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UMTS Network Structure

RNS

RNC

RNS

RNC

Core Network

NodeB NodeB NodeB NodeB

Iu-CS Iu-PS

Iur 

Iub IubIub Iub

CN

UTRAN

UEUu

CS PS

Iu-CSIu-PS

CSPS

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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

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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.

 ApplicationProtocol

DataStream(s)

 ALCAP(s)

Transport

Network

Layer 

Physical Layer 

Signaling

Bearer(s)

Control Plane User Plane

Transport Network

User Plane

Transport Network

Control Plane

Radio

Network

Layer 

Signaling

Bearer(s)

Data

Bearer(s)

Transport Network

User Plane

 

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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.

 ApplicationProtocol

DataStream(s)

 ALCAP(s)

Transport

Network

Layer 

Physical Layer 

Signaling

Bearer(s)

Control Plane User Plane

Transport Network

User Plane

Transport Network

Control Plane

Radio

Network

Layer 

Signaling

Bearer(s)

Data

Bearer(s)

Transport Network

User Plane

 

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RNL Control Plane Application Protocol

NBAP Node B Application PartRANAP Radio Access Network Application Part

RNSAP Radio Network Subsystem Application Part

RRC Radio Resource Control

NodeB

RNC

CN

UE

RANAP 

NBAP 

RNSAP RRC RNC

   

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Iu-CS Interface (based on ATM)

ALCAP

Control Plane

Transport Network

Control Plane

User planeRadio

Network

Layer 

Transport Network

User Plane

Transport

Network

Layer A B

RANAP

AAL2 PATH

ATM

Physical Layer 

SAAL NNI

SCCP

MTP3-B

Iu UP

SAAL NNI

MTP3-B

Transport Network

User Plane

  

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Iu-CS Interface (based on IP)

Control Plane User planeRadio

Network

Layer 

Transport Network

User Plane

Transport

Network

Layer 

RANAP

IP

Physical Layer 

IP

SCTP

Iu UP

Transport Network

User Plane

DATA LINK DATA LINK

M3UA

SCCPRTP/RTCP

UDP

  

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Iu-PS Interface (based on ATM)

Control Plane User planeRadio

Network

Layer 

Transport NetworkUser PlaneTransport

Network

Layer 

Transport Network

User Plane

C

RANAP

ATM

SAAL NNI

SCCP

MTP3-B

Iu UP

AAL Type 5

IP

UDP

GTP-U

Physical Layer 

  

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Iu-PS Interface (based on IP)

Control Plane User planeRadio

Network

Layer 

Transport Network

User Plane

Transport

Network

Layer 

RANAP

IP

Physical Layer 

IP

SCTP

Iu UP

Transport Network

User Plane

DATA LINK DATA LINK

M3UA

SCCPGTP-U

UDP

   

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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

  

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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

  

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Iur Interface (based on ATM)

ALCAP

Control Plane

Transport Network

Control Plane

User planeRadio

Network

Layer 

Transport

Network

Layer A 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

  

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Iur Interface (based on IP)

Control Plane User planeRadio

Network

Layer 

Transport Network

User PlaneTransport

Network

Layer 

RNSAP

IP

Physical Layer 

IP

SCTP

Iur Data

Stream

Transport Network

User Plane

DATA LINK DATA LINK

M3UA

SCCP

UDP

 

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Contents

1. UTRAN Network Overview

2. Basic Concepts about UTRAN

3. UTRAN Signaling Procedure

 

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SRNC / DRNC

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

CN

SRNC DRNC

Interface

Data

 

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RAB, RB and RL

RAB

RB

RLNodeB

RNC CNUE

UTRAN

 

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UE Working Modes and States

Idle Mode

Connected Mode

CELL_DCH

CELL_FACH

CELL_PCH

URA_PCH

 

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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

 

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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)

 

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Connected Mode

Cell-DCH

In active state

Communicating via its dedicated channels

UTRAN knows which cell UE stays in

 

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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

 

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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

 

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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

 

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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, DRX,and save power RRC Connection

- Common channel- PS service with few

data to transmit

- Reduce activity further - Avoid unnecessarysignaling

 

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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

 

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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)

 

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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 

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

 

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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

SIB11: measurement controlling information

SIB12: measurement controlling information in connected mode

 

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Introduction of System Information

SIB13: AN SI -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

 

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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

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

 

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System Information Block Type 2

System info type 2

URA information

 

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System Information Block Type 3

The references for cell selection

and re-selection

Qhyst2s

Sintrasearch

Sintersearch

Sinterratsearch

Qqualmin

Qrxlemin

T reselection

Max Allowed UE TX power 

 

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System Information Block Type 5

The configuration information for 

the following physical channels

and the counterpart transport

channels

PCCPCH

SCCPCH

PICH

 AICH

PRACH

 

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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

 

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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 Initiation

CN initiated paging

Establish a signaling connection

UTRAN initiated paging

Trigger the cell update procedure

Trigger reading of updated system information

  

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Paging Type 1

If UE is in CELL_PCH,URA_PCH or IDLE statethe 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

 

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Paging Type 2

If UE is in CELL_DCH or CELL_FACH statethe paging

message will be transmitted on DCCH with paging type 2

CN SRNC UE

RANAPRANAP

PAGING

RRCRRCDCCH: PAGING TYPE 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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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)

Security flow (optional)

RAB establish flow

Call proceeding

NAS signaling before correlative bearer release

Correlative bearer release

 

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RRC Connection Establishment Flow (CCH)

 

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RRC Connection Establishment Flow (DCH)

 

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RRC Connection Establishment Flow (DCH)

 

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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.

 

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Common ID

 

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 Authentication and Security Flow

 

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 Authentication and Security Flow

 

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Call Setup Flow

 

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RAB Establishment Flow

 

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RAB Establishment Flow

 

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RRC Connection Release Flow (CCH)

 

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RRC Connection Release Flow (DCH)

 

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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

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

Security Mode Command Complete

RAB Assignment

Setup

Call Confirmed

Alerting

Connect

Connect ACK

Disconnect

Release

Release Complete

Paging

RRC and NAS signaling Connection Setup

 

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UE to UE CS Call Process (1)

RRC Con

Setu

 NAS Sig

Setu

 

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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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PS Call Process

RR

 N

 

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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 

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

 

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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

RNC (SRNC)

 AirBridge AirBridge

 AirBridge AirBridge

 AirBridge AirBridge

Core NetworkCore Network

Node B

  

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Soft Handover Flow

RNC (SRNC)

 AirBridge AirBridge

 AirBridge AirBridge

 AirBridge AirBridge

Merged in NodeB

Core NetworkCore Network

Node B

  

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Soft Handover Flow

Merged in RNC

RNC (SRNC)

 AirBridge AirBridge

 AirBridge AirBridge

 AirBridge AirBridge

Core NetworkCore Network

Node B

  

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Soft Handover Flow (SRNC-DRNC)

Merged in SRNC

Node B

 AirBridge AirBridge

 AirBridge AirBridge

 AirBridge AirBridge

Serving RNC

Drift RNC

Core NetworkCore Network

 

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Soft Handover Flow (SRNC Relocation)

Node B

 AirBridge AirBridge

 AirBridge AirBridge

 AirBridge AirBridge

Serving RNC

RNC

Core NetworkCore Network

 

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Typical Soft Handover Flow (L3 Signaling)

Soft handover is triggered by 1A/1B/1C or 1D event

 

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Soft Handover Flow (Add Branch in AS)

 

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Soft Handover Flow (Del Branch from AS)

 

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Hard Handover 

Before Handover  After Handover 

Radio Link can not exist simultaneously

SRNC

NodeBNodeB

SRNC

NodeBNodeB

CNCN

 

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Intra-Frequency Hard Handover 

Intra-Frequency hard handover is triggered by 1D event

 

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Inter-frequency Handover 

UE

 

CS Domain Inter RAT Handover Flow

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CS Domain Inter-RAT Handover Flow

(UMTS->GSM)

 

PS Domain Inter RAT Handover Flow (UMTS

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PS Domain Inter-RAT Handover Flow (UMTS-

>GSM & UE in CELL_FACH, CELL_PCH or 

URA_PCH)

 

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PS Domain Inter-RAT Handover Flow

(UMTS->GSM & UE in CELL_DCH)

 

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Inter-RAT Handover Flow (GSM->UMTS)

 

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