Download - WCDMA UTRAN Interface and Signaling Procedure ISSUE 11

8/2/2019 WCDMA UTRAN Interface and Signaling Procedure ISSUE 11

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

WCDMA UTRANInterface andSignalingProcedure


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

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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Contents





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The Position of UTRAN in WCDMANetwork


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UMTS Construction

UTRAN UMTS Terrestrial Radio Access NetworkCN Core NetworkUE User Equipment

Iu

UTRAN

UEUu

CN


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UMTS Structure

RNS

RNC

RNS

RNC

Core Network

Node B Node B Node B Node B

Iu Iu

Iur

Iub IubIub Iub


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Uu Interface

L3

contro

l

contro

l

contro

l

LogicalChannels

TransportChannels

C-plane signalling U-plane information

PHY

L2/MAC

L1

RLC

DCNtGC

L2/RLC

MAC

RLCRLCRLC

RLC

RLCRLC

RLC

Duplication avoidance

UuS boundary

BMC L2/BMC

control

PDCPPDCP L2/PDCP

DCNtGC

RadioBearers

RRC

contro

l


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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)

TransportNetwork

Layer

Physical Layer

SignallingBearer(s)

TransportUser

NetworkPlane

Control Plane User Plane

TransportUser

NetworkPlane

Transport NetworkControl Plane

RadioNetwork

Layer

SignallingBearer(s)

DataBearer(s)


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RNL Control Plane ApplicationProtocol

NBAPNode B Application PartRANAPRadio Access Network Application PartRNSAPRadio Network Subsystem Application PartRRC Radio Resource Control

Node B

RNC

CN

UE

RANAP

NBAP

RNSAPRRCRNC


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Iu-CS Interface

Q.2150.1

Q.2630.1

RANAPIu UP Protocol

Layer

TransportNetwork

Layer

Transport NetworkUser Plane




RadioNetwork

Layer

SSCOP

AAL5

SSCOP

SSCF-NNI

AAL2AAL5

MTP3bMTP3b

SCCP

SSCF-NNI

Physical Layer

ATM


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Iu-PS Interface

SSCF-NNI

SSCOP

AAL5

IP

SCTP

SCCP

SSCF-NNI

MTP3-B

M3UA

Physical Layer


ATM

AAL5

IP

UDP

GTP-U

Physical Layer

ATM

Transport

Network

Layer


Radio

Network

Layer

RANAP Iu UP ProtocolLayer




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Iub Interface

Node BApplication Part

(NBAP)

AAL Type 2

ALCAP

TransportLayer

RadioNetwork

Layer

Radio NetworkControl Plane

TransportNetwork

Control Plane

DCHFP

RACHFP

ATM

DSCHFP

AAL Type 5

User Plane

SSCF-UNI

SSCOP

AAL Type 5

SSCF-UNI

SSCOP

Q.2630.1

Q.2150.2

FACHFP

PCHFP

USCHFP

CPCHFP

Physical Layer


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Iur Interface

SSCF-NNI

SSCOP

MTP3-B

AAL5

IP

SCTP

SCCP

AAL5

STC (Q.2150.1)

RNSAPIur Data

Stream(s)

Physical Layer


ATM

ALCAP(Q.2630.1)

AAL2

SSCF-NNI

SSCOP

MTP3-B

IP

SCTP

M3UAM3UA

Transport

Network

Layer


Radio

NetworkLayer




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Contents





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SRNC/DRNC

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 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

IuIur


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CRNC

The CRNC owns the radio resources of a cell

Dynamical control of power for dedicated channels, within limits admittedby CRNC, is done by the SRNC.

Scheduling of data for dedicated channels is done by the SRNC, while for

common channels it is done by the CRNC

Iub

Node B

Cell Cell Cell

Node B

...

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

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, asignalling 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.


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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)


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Connected Mode

Cell-DCH

In active state

Communicating via its dedicated channels

UTRAN knows which cell UE is 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 need to monitor the FACH for its relative information.



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Connected Mode

Cell-PCH

No data to be transmitted or received.

Monitor PICH, to receive its paging.

lower the power consumption of UE.


UTRAN have to update cell information of UE when UE roams

to another cell


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Connected Mode

URA-PCH

No data to be transmitted or received.

Monitor PICH.

UTRAN only knows which URA (UTRAN Registration Area,

which consists of multiple cells) that UE is in.

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 States

CELL_DCH CELL_FACH

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 Signalingtrigger (CN)

- Reduce actionDTXand save power

RRC connection


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RNTI - Radio Network TemporaryIdentifier Five Types of RNTI exist

Serving RNC RNTI (S-RNTI)

Drift RNC RNTI (D-RNTI)

Cell RNTI (C-RNTI)

UTRAN RNTI (U-RNTI)

HS-DSCH RNTI (H-RNTI)


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Contents





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Contents


3.1 Cell Setup

3.2 System Information Broadcast

3.3 Paging

3.4 Call Process

3.5 Handover


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Cell Setup

NBAP

NBAP

NBAP

NBAP

NBAP

NBAP

NBAP

NBAP

NBAP

NBAP

NCP: Resource Status Ind

NCP: Audit Req

NCP: Cell Setup Req

NCP: Cell Setup Rsp

NBAPNBAP NCP: Comm TrCh Setup Req

NBAPNBAP NCP: Comm TrCh Setup Rsp

Q.AAL2

Q.AAL2

Q.AAL2

Q.AAL2

Est Req

Est Conf

RNC NodeB

NCP: Audit Rsp

NBAPNBAP NCP: Comm TrCh Setup Req

NBAPNBAP NCP: Comm TrCh Setup Rsp

Q.AAL2

Q.AAL2

Q.AAL2

Q.AAL2

Est Req

Est Conf


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Contents


3.1 Cell Setup


3.3 Paging

3.4 Call Process

3.5 Handover


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System Information BroadcastFlow

3.BCCH:System Information

1.System Information Update Request

UE Node B RNC CN

NBAPNBAP

RRCRRC

4.BCCH:System Information RRCRRC

5.BCCH:System Information RRCRRC

2.System Information Update Response

NBAPNBAP


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Introduction of System Information

MIBContains PLMN tag and SB (scheduling information block) or thescheduling information for SIB (system info block)

SB1Contains scheduling information for SIB

SB2Contains scheduling information for SIB

SIB1Contains the system information for NAS and the timer/counter for UE

SIB2

Contains the URA informationSIB3

Contains the parameters for cell selection and cell re-selection


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SIB4Contains parameters for cell selection and cell re-selection while UE is inconnecting mode

SIB5Contains parameters for the common physical channels of the cell

SIB6Contains parameters for the common physical channels of the cell whileUE is in connecting mode

SIB7Contains the uplink interference level and the refreshing timer for SIB7

SIB8Contains the CPCH static information


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SIB9Contains the CPCH dynamic information

SIB10Contains information to be used by UEs having their DCH controlled by aDRAC procedure

Used in FDD mode onlyTo be used in CELL_DCH state onlyChanges so often, its decoding is controlled by a timer

SIB11Contains measurement controlling information

SIB12Contains measurement controlling information in connecting mode

SIB13Contains ANSI-41 system information


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SIB14:Contains the information in TDD mode

SIB15:Contains the position service information

SIB16:Contains the needed pre-configuration information for handover fromother RAT to UTRAN

SIB17:Contains the configuration information for TDD

SIB18:Contains the PLMN identities of the neighboring cellsTo 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 DRXK 6then

DRX period is 2^k = 2 ^ 6 = 64

TTI = 640 ms

PS domain DRXK 6then

DRX period is 2^k = 2 ^ 6 = 64

TTI = 640 ms

The different timers for UE inconnecting mode and idle mode.


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System info type 2

URA information


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The references for cellselection and re-selection

Qhyst2s

Sintrasearch Sintersearch

SinterRatsearch

Qqualmin

Qrxlemin

T reselection

Max Allowed UE TX power


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The configuration

information for the following

physical channels and the

counterpart transport

channels

PICH

AICH

PCCPCH PRACH

SCCPCH


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System Information Block Type 7and 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.


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Contents


3.1 Cell Setup


3.3 Paging

3.4 Call Process

3.5 Handover


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Paging Caused by CN

The paging information type which is sent by UTRAN is

decided by UE mode.

If UE is in the CELL_FACH or CELL_DCHUTRAN send

paging type 2. In other modes, the paging information istype 1 and UE can use DTX method to detecting PICH.


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Paging Caused by UTRAN

UE RNC1NodeB1

RRCPagingType1RRC


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Contents


3.1 Cell Setup


3.3 Paging

3.4 Call Process

3.5 Handover


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Introduction of Call Process

In WCDMA system, a call process includes the following basicsignaling 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

RRC Connection Establishment Flow


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RRC Connection Establishment Flow(DCH)

When UE is in IDLE mode and the NAS of UE request the signaling connection, UE will send a RRC Connection

Request. Each UE only can have on RRC Connection. The main function is to configure the signaling channel of

UTRAN.

1. CCCH: RRC Connection Request

5. Downlink Synchronisation

UE

Node B

Serving RNS

Serving

RNC

DCH - FP

Allocate RNTISelect L1 and L2parameters

RRCRRC

NBAPNBAP

3. Radio Link Setup Response

NBAPNBAP2. Radio Link Setup Request

RRCRRC7. CCCH: RRC Connection Set up

Start RXdescription

Start TXdescription

4. ALCAP Iub Data Transport Bearer Setup

RRCRRC9. DCCH: RRC Connection Setup Complete

6. Uplink Synchronisation

NBAPNBAP8. Radio Link Restore Indication

DCH - FP

DCH - FP

DCH - FP

I I t f Si li C ti


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Iu Interface Signaling ConnectionEstablish

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 RNC and CN.

UE Node B RNC CN

RRC RRC

SCCP SCCP

SCCP SCCP

Initial DT

Initial UE message (ConnectRequest)

Connect Confirm

RANAP


Control Plane

SSCOP

AAL5

MTP3b

SCCP

SSCF-NNI


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Authentication and Security FlowUE RNC CN

RRC Connection Setup

Initial DTInitial UE Message

DL DT (Authentication

Request)DL DT (AuthenticationRequest)

DL DT (AuthenticationRequest) DL DT (Authentication

Request)

Common ID

Security Mode CommandSecurity Mode Command

Security Mode Command


RAB Assignment


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Common ID


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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 Rep

NBAPNBAPRL Recfg Ready

Q.AAL2Q.AAL2AAL2 Setup Req

Q.AAL2Q.AAL2AAL2 Setup Rep

FPFPDL Sync

FPFPUL Sync

RRC RRCRB Setup

NBAPNBAPRL Recfg Commit

RRC RRCRB Setup Complete

RANAPRANAPRAB Ass Rep


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NAS Signaling (CS)

UE Terminating Call

UE MSC

CM Service Request

RRC and NAS signaling Connection Setup

Authentication Request

Authentication Response



RAB Assignment

Setup

Call Proceeding

Alerting

Connect

Connect ACKDisconnect

Release

Release Complete

UE Outgoing Call

UE MSC

Paging Response

Authentication Request

Authentication Response



RAB Assignment

Setup

Call Confirmed

Alerting

Connect

Connect ACK

Disconnect

Release

Release Complete

Paging

RRC and NAS signaling Connection Setup


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NAS Signaling (PS)UE MSC

CM Service Accept

Service Request

RRC

Activate PDP Context Req

Activate PDP Context Accept

RAB

Deactivate PDP Context Req

Deactivate PDP Context Accept

UE Outgoing Call

UE MSC

Service Request

RRC

Request PDP Context Activation

Activate PDP Context Req

RAB

UE Terminating Call

Paging

Authenticate and ciphering Req

Authenticate and ciphering Rsp Authenticate and ciphering Req

Authenticate and ciphering Rsp

Activate PDP Context Accept

Deactivate PDP Context Req

Deactivate PDP Context Accept

SGSN SGSN

RRC connection and NAS signalingconnection establishment RRC connection and NAS signaling

connection establishment

Security Mode

Security Mode

RAB establishment

RAB establishment


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UE to UE (1)Ori UE Ter UENodeB1 NodeB2RNC1 CN RNC2

1.RRC Connect Setup Req

2.RL Setup Req

3.RL Setup Rsp

4.AAL2 Setup Req

5.AAL2 Setup Rsp

6.DL Sync

7.UL Sync

8.RRC Connect Setup

9.RRC Connect Setup Cmp

10.Initial DT

11.InitUE(CM

ServiceReq)

12.DT(AuthenticaReq)

15.DT(Authentica

Rsp)

13.DL DT

14.UL DT

RANAP

RRCRRC

NBAPNBAP

NBAPNBAP

Q.AAL2Q.AAL2

Q.AAL2Q.AAL2

FPFP

FPFP

RRCRRC

RRCRRC

RRCRRC

RANAP

RANAP RANAP

RRC RRC

RRCRRC

RANAP RANAP


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RANAP RANAP64.RAB Ass Req

NBAPNBAP

70.RL Recfg

ReadyNBAPNBAP

69.RL RecfgPrep

Q.AAL2 Q.AAL2

72.AAL2

Setup RspQ.AAL2 Q.AAL2

71.AAL2

Setup Req

FPFP 73.DL Sync

FPFP 74.UL Sync

RRC RRC75.RB Setup

Q.AAL2 Q.AAL265.AAL2 Setup

Req

Q.AAL2 Q.AAL266.AAL2 Setup

ConfFPFP 67.DL Sync

FPFP 68.UL Sync


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NBAPNBAP76.RL Rcfg

Commit

RRC RRC77.RB Setup Complete

RANAP RANAP78.RAB Ass

Rsp

RRC RRC79.UL DT

RANAP RANAP80.DT(Alerti

ng)

RANAP RANAP81.DT(Alerting)

RRC RRC82.DL DT

RRC RRC83.UL DT

RANAP RANAP84.DT(Connec

t)

RANAP RANAP85.DL

DT(Connect)

RRC RRC86.DL DT

RRC RRC87.UL DT

RANAP RANAP

RANAP RANAP

RRC RRC

88.UL DT

89.DT(Connec

t Ack)

90.DL DT

Alerting

Connect


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Contents


3.1 Cell Setup


3.3 Paging

3.4 Call Process

3.5 Handover


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Concepts about Soft Handover

Soft handover: the signals from different NodeBs are merged inRNC.

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

same NodeB are merged in NodeB.


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Node B

RNC

AirBridge

AirBridge

AirBridge

Soft Handover Flow

Core Network


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Node B

RNC

AirBridge

AirBridge

AirBridge

Merged in NodeB

Soft Handover Flow

Core Network


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Merged in RNC

Node B

RNC

AirBridge

AirBridge

AirBridge

Soft Handover Flow

Core Network


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Soft Handover Flow (SRNC-DRNC)

Merged in SRNC

Node B

AirBridge

AirBridge

AirBridge

Serving RNC

Drift RNC

Core Network

Soft Handover Flow (SRNC


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Soft Handover Flow (SRNCRelocation)

Node B

AirBridge

AirBridge

AirBridge

Serving RNC

RNC

Core Network


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Before Handover After Handover

SRNC

NodeBNodeB

SRNC

NodeBNodeB

SRNC

NodeBNodeB

During Handover

Soft Handover FlowIntra-RNC

CNCN CN

Soft Handover FlowAdd Branch


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Decision to setupnew RL

7. DCCH : Active Set Update Complete

6.DCCH: Active Set Update

UE Node B(new) SRNC

NBAP1. Radio Link Setup RequestNBAP

NBAP

2. 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 RX description

RRC

RRC

RRC

RRC

Soft Handover FlowAdd Branchin RNC

Soft Handover FlowDel Branch


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Decision to deletea RL

2. DCCH : Active Set Update Complete

1.DCCH: Active Set Update

UE Node B(old) SRNC

NBAP3. Radio Link Deletion RequestNBAP

NBAP4. Radio Link Deletion ResponseNBAP

RRC

RRC

RRC

RRC

Stop RX and Tx

5 ALCAP Iub Transport Bearer release

Soft Handover FlowDel Branchin RNC


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Before Handover After Handover

Radio Link can not exist simultaneously

SRNC

NodeBNodeB

SRNC

NodeBNodeB

Hard Handover (Intra-RNC)

CNCN

C


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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 IndicationRRCRRC

NBAPNBAP

NBAP

RRCRRC

NBAP

NBAP

NBAP NBAP

Decide to

handover

Start Rx

Start Tx

DCH-FP4. Downlink SynchronisationDCH-FP

DCH-FP5.Uplink SynchronisationDCH-FP

NBAP

NBAP

NBAP

11. ALCAP Iub Data Transport Bearer Release

Hard Handover (Intra-RNC)

SRNC R l i


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SRNC Relocation

SRNS

Core Network

Iu

DRNSIur

UE

RNS

Core Network

Iu

SRNS

UE

After SRNS RelocationBefore SRNS Relocation

Cells


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Inter-System Handover Flow


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UMTS->GSMUE NodeB RNC 3G MSC 2G MSC BSS

Measurement Report(2D)

RL Recfg Prep

RL Recfg Ready

Physical Channel Reconfiguration

RL Recfg Commit

Physical Channel Reconfiguration cmp

Measurement Control(InterRAT)

Measurement Report(GSM)

Relocation Required

Relocation Command

Prepare Handover

Handover Request

Handover Request ACK

Prepare Handover RSP

Handover From UTRAN CMD

Handover Complete

IU release command

IU release complete

RRC Con Release Req

RRC Con Release Cmp

RL Del Req

RL Del Rsp



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Inter-System 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

requeset

Inter System to UTRAN Ho cmd (Handover to UTRAN 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

F d H d


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Forward Handover

Forward Handover is sponsored by UE, including cellupdate 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.

S


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Summary

This chapter mainly explains the basic signaling flow inUTRAN. This is very helpful for the CN signaling flow.


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