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OWA210001WCDMA UTRAN

Signaling Procedure

ISSUE 1.0

HUAWEI TECHNOLOGIES CO., LTD. Page 1All rights reserved

Upon completion of this course, youwill be able to:

Understand UTRAN Interface andstructure

Understand the definitions aboutUTRAN network elements

Understand UTRAN signalingprocedure


Chapter 1 UTRAN Network OverviewChapter 1 UTRAN Network Overview

Chapter 2 Basic Concepts about UTRANChapter 2 Basic Concepts about UTRAN

Chapter 3 UTRAN Signaling ProcedureChapter 3 UTRAN Signaling Procedure


The Position of UTRAN in WCDMA Network


UMTS Construction

Iu

UTRAN

UE

Uu

CN

UTRANUTRAN UMTS Terrestrial Radio Access NetworkUMTS Terrestrial Radio Access NetworkCNCN Core NetworkCore NetworkUEUE User EquipmentUser Equipment


UMTS Structure

RNS

RNC

RNS

RNC

Core Network

Node B Node B Node B Node B

Iu Iu

Iur

Iub IubIub Iub


Uu Interface

L3

c

o

n

t

r

o

l

c

o

n

t

r

o

l

c

o

n

t

r

o

l

LogicalChannels

TransportChannels

C-plane signalling U-plane information

PHY

L2/MAC

L1

RLC

DCNtGC

L2/RLC

MAC

RLCRLC

RLCRLC

RLCRLCRLC

Duplication avoidance

UuS boundary

BMC L2/BMC

control

PDCPPDCP L2/PDCP

DCNtGC

RadioBearers

RRC

c

o

n

t

r

o

l


Iu-CS Interface

Q.2150.1

Q.2630.1

RANAPIu UP Protocol

Layer

TransportNetwork

Layer

Transport NetworkUser Plane

Control Plane User Plane


Transport NetworkControl Plane

RadioNetwork

Layer

SSCOP

AAL5

SSCOP

SSCF-NNI

AAL2AAL5

MTP3bMTP3b

SCCP

SSCF-NNI

Physical Layer

ATM


Iu-PS Interface

SSCF-NNI

SSCOP

AAL5

IP

SCTP

SCCP

SSCF-NNI

MTP3-BM3UA

Physical Layer


ATM

AAL5

IP

UDP

GTP-U

Physical Layer

ATM

TransportNetwork

Layer


RadioNetwork

LayerRANAP Iu UP ProtocolLayer




Iub Interface

Node BApplication Part

(NBAP)

AAL Type 2

ALCAP

TransportLayer

RadioNetwork

Layer

Radio NetworkControl Plane

TransportNetwork

Control Plane

DC

H FP

RA

CH

FP

ATM

DSC

H FP

AAL Type 5

User Plane

SSCF-UNI

SSCOP

AAL Type 5

SSCF-UNI

SSCOP

Q.2630.1

Q.2150.2

FAC

H FP

PCH

FP

USC

H FP

CPC

H FP

Physical Layer


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

TransportNetwork

Layer


RadioNetwork

Layer




Question

What kind of Interfaces are there in UTRAN ?


RAB, RB and RL

RAB

RB

RLNodeB

RNC CNUE

UTRAN


RAB, RB and RL

RAB The service that the access stratum provides to thenon-access stratum for transfer of user data between UserEquipment and CN

RB The service provided by the layer2 for transfer of userdata between User Equipment and Serving RNC

RL A "radio link" is a logical association between single UserEquipment and a single UTRAN access point. Its physicalrealization comprises one or more radio bearer transmissions


UE Working Modes and states

Idle mode

Connected mode

Cell_DCH

Cell_FACH

Cell_PCH

URA_PCH


UE Working Modes and states 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 thecontrol 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.


UE Working Modes and states Connected Mode (Cell-DCH, Cell-FACH, Cell-PCH, URA-PCH)

When at least one signalling connection exists, the UE is inconnected mode and there is normally an RRC connection betweenUE and UTRAN. The UE position can be known on different levels:

< UTRAN Registration Area (URA) levelThe UE position is known on URA level. The URA is a set ofcells

< Cell levelThe UE position is known on cell level. Different transportchannel types can be used for data transfer:

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

< Dedicated transport Channels (DCH)


UE Working Modes and states

Cell-DCH

< In active state

< Communicating via its dedicatedchannels

< UTRAN knows which cell UE is in.


Cell-FACH and Cell-PCH State 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.

Cell-PCH< No data to be transmitted or received.< Monitor PICH, to receive its paging.< lower the power consumption of UE.< UTRAN knows which cell UE is in.< UTRAN have to update cell information of UE when UE

roams to another cell


URA-PCH State

URA-PCH

< No data to be transmitted or received.

< Monitor PICH.

< UTRAN only knows which URA (UTRANRegistration Area, which consists of multiplecells) that UE is in.

< UTRAN update UE information only after UE hasroamed to other URA.

< A better way to lower the resource occupancyand signaling transmission


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 Signaling

trigger (CN)

- Reduce actionDTXand save power

RRC connection


SRNC/DRNC

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

The SRNC handles the connection to one UE, and may borrowradio resources of a certain cell from the DRNC

Drift RNSs support the Serving RNS by providing radio resources

A UE in connection state has at least one and only one SRNC, butcan has 0 or multiple DRNCs

CN

SRNC DRNC

IuIur


CRNC

The CRNC owns the radio resources of a cell

Dynamical control of power for dedicated channels, within limitsadmitted by 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


Questions

Whats the meaning of RAB, RB RL?

How many state on UE can have in WCDMA? Could youuse an example to explain the states?

Could you explain what is the SRNC, DRNC, CRNC?



3.1 Cell Setup3.1 Cell Setup

3.2 System Information Broadcast3.2 System Information Broadcast

3.3 Paging3.3 Paging

3.4 Call process3.4 Call process

3.5 Handover3.5 Handover


Cell Setup

NBAP

NBAP

NBAP

NBAP

NBAP

NBAP

NBAP

NBAP

NBAP

NBAP

NCP :Resouce 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


Cell Setup

Setup NCP and CCP in SAAL link stratum, which NCPcarries the NBAP public information and CCP carries theNBAP dedicated information. One NodeB only can setupone NCP, but can setup several CCP;

to prepare the cell setting up, the resource of Node Bshould be audited.;

Logic cell setup

Setup the common transport channel for cell, includingRACH, FACH and PCH.

The process of cell setupThe process of cell setup


System Information Broadcast Flow

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 ResponseNBAPNBAP


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

SIB2Contains the URA information

SIB3Contains the parameters for cell selection and cell re-selection



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



SIB9Contains the CPCH dynamic information

SIB10Contains information to be used by UEs having their DCH controlledby a DRAC procedureUsed 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



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


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 = 640ms

PS domain DRXK 6then DRXperiod is 2^k = 2 ^ 6 = 64 TTI = 640ms

The different timers for UE inconnecting mode and idle mode.



System info type 2

URAinformation



The references for cell selectionand re-selection

Qhyst2s

Sintrasearch

Sintersearch

SinterRatsearch

Qqualmin

Qrxlemin

T reselection

Max Allowed UE TX power



The configuration informationfor the following physicalchannels and the counterparttransport channels

PICH

AICH

PCCPCH

PRACH

SCCPCH


System Information Block Type 7 and 11

System info type 7

Including the UL interference level which is used foropen loop power control:

Preamble_Initial_Power=Primary CPICH DL TXpower - CPICH_RSCP + UL interference + ConstantValue

Including the Expiration Time Factor which is usedfor refreshing the SIB7 periodically

System info type 11

The neighbor cell information for cell re-selection inIDLE mode.


Paging caused by CN


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_DCHUTRANsend paging type 2. In other modes, the paging

information is type 1 and UE can use DTX method

to detecting PICH.


Paging caused by UTRAN

When the system information is modified, UTRAN will send the paginginformation to tell UEs which are in IDLE, Cell_PCH or URA_PCH mode. Then,UE will read the modified system information from BCH.

To change the state of UE which is in Cell_PCH or URA_PCH state, UTRANwill start a paging flow. Then, UE will start a Cell-Update or URA update flowfor response.


Introduction of Call Process

In WCDMA system, a call process includes thefollowing basic signaling flows:

RRC Connection flow

Iu interface signaling flow

Authentication flow,

security flow

RAB establish flow.

These basic flows include NAS signaling, andthe authentication and security flow are optional


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 BServing RNSServingRNC

DCH - FP

Allocate RNTISelect L1 and L2parameters

RRCRRC

NBAPNBAP3. 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


Iu Interface Signaling Connection establish

In Iu interface, radio network layer reports theRANAP information and NAS information.NAS information is taken as directedmessage in RANAP information.

And the process of Iu signaling connection isto establish the Iu interface connection ofSCCP 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


Authentication and Security flow

Authentication is used for the validity of CN and UE. Security flow include the encrypt process and integrity protection.

UE RNC CN

RRC Connection SetupInitial DT

Initial UE Message

DL DT (AuthenticationRequest)DL DT (Authentication

Request)DL DT (Authentication

Request) DL DT (AuthenticationRequest)

Common ID

Security Mode CommandSecurity Mode Command

Security Mode CommandSecurity Mode Command

RAB Assignment


RAB Establishment flow

UE CNRNCNodeB

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

RAB is the carrier which is provided by AS for NAS. RAB is the carrier in user plane, which is for transferring the voice service, data service or multiple media service

between UE and CN. RAB establishment flow mainly includes the AAL2 PATH establishment of Iu and Iub interface, also includes the

reconfiguration process of radio resource.


NAS Signaling

Authentication and security flow are optional. CN does not need to the CM Service Response if the security mode is used.

UE MSC

CM Service Request

RRC Connection Setup

Authentication Request

Authentication Response

Security Mode Command


RAB Assignment

SetupCall Proceeding

Alerting

ConnectConnect ACK

Disconnect

ReleaseRelease Complete

UE Outgoing Call

UE MSC

Paging Response

RRC Connection Setup

Authentication Request

Authentication Response



RAB Assignment

SetupCall Confirmed

Alerting

ConnectConnect ACK

Disconnect

ReleaseRelease Complete

Paging

UE Terminating Call


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 DT11.Init UE(CMService Req)

12.DT(Authentica Req)

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



22.DT(Call Setup)

26.Paging

28.Paging type1

30.RRC Conn Setup Req

33.RL Setup Rsp

31.RL Setup Req

36.AAL2 Setup Rsp

34.AAL2 Setup Req

16.Common ID17.Sec Mod Cmd

20.Sec Mod Cmp21.UL DT

18.Sec Mod Cmd19.Sec Mod Cmp

24.DL DT

23.DT(Call Procceding)

25.RAB Ass Req

32.RLRecfg Prep

35.RL Recfg Ready

27.AAL2 Setup Req

29.AAL2 Setup Rsp

IU AAL2 may beestablished later

1 CNCM Service Req

CC Alerting

RANAPRANAP RANAP

RRC RRC

RRC RRC

RANAP RANAPRRC RRC

RANAP RANAPRANAP RANAP

RRCRRCRANAP RANAP

RANAP RANAP

RRC RRCQ.AAL2 Q.AAL2

Q.AAL2 Q.AAL2RRC RRC

NBAP NBAP

NBAP NBAP

NBAP NBAP

NBAP NBAP

Q.AAL2 Q.AAL2

Q.AAL2 Q.AAL2

RANAP



38.DL Sync

40.UL Sync

42.RRC Conn Setup Cmp

41.RRC Conn Setup

45.Initial DT46.Init UE(Paging

Rsp)

56.Sec mod cmd57.Sec mod cmd58.Sec mod cmp

54.ULDT(Authent Rsp)

47.DT(Authent Req) 49.DL DT

50.UL DT

55.Common ID

60.DT(Setup)59.Sec mod cmp

61.DL DT63.Call Confirm

62.UL DT

37.AAL2Setup Req39.AAL2Setup Rsp

43.DL Sync

44.UL Sync

51.RLRecfgCommit

48.RB Setup

52.RB Setup Complete 53.RAB

Ass Rsp

RRC RRC

RRC RRC

RANAP RANAP

RANAP

FPFP

FPFP

Q.AAL2Q.AAL2

NBAPNBAP

RANAP

RANAP

RRCRANAP

RRC RRCRRC

Q.AAL2Q.AAL2

RRC

RANAP

RANAP RANAP

RANAPRRCRRC

RRC

RRC RRC

RRC

RRC

RANAP

RRC RRCRANAP

RANAP RANAP

RANAPRANAPRANAP

RRCRRCRRC RRC

FP

FP

FP

FP

RANAP


UE to UE (5)



NBAPNBAP 76.RL RcfgCommitRRC RRC77.RB Setup Complete

RANAP RANAP78.RAB Ass RspRRC RRC79.UL DT

RANAP RANAP80.DT(Alerting)

RANAP RANAP81.DT(Alerting)

RRC RRC82.DL DT

RRC RRC83.UL DT

RANAP RANAP84.DT(Connect)

RANAP RANAP85.DL DT(Connect)RRC RRC86.DL DT

RRC RRC87.UL DTRANAP RANAP

RANAP RANAP

RRC RRC

88.UL DT89.DT(Connec

t Ack)90.DL DT

AlertingConnect



RANAP RANAP92.DT(Disconnect)

RRC RRC91.UL DT

RANAP RANAP96.DT

(Disconnect)

RRC RRC97.DL DT

RRC RRC98.UL DT

RANAP RANAP99.DT(Release)

RANAP RANAP93.DT(Release)

RRC RRC94.DL DT

RRC RRC95.UL DT

RANAP RANAP102.DT(Release Ack)

RANAP RANAP100.DT(Rel Comp)

RRC RRC101.DL DT

RANAP RANAP103.IU Rel Cmd



Q.AAL2 Q.AAL2104.AAL2 Rel ReqQ.AAL2 Q.AAL2105.AAL2 Rel Conf

RANAP RANAP

Q.AAL2 Q.AAL2

IU Rel Cmd

Q.AAL2 Q.AAL2

113.AAL2 Rel Req

114.AAL2 Rel Conf

RRC RRC107.RRC Conn Rel Req

RRC RRC108.RRC Conn Rel CmpNBAP NBAP109.RL Rel Req

NBAP NBAP110.RL Rel Rsp

Q.AAL2 Q.AAL2

Q.AAL2 Q.AAL2

111.AAL2 Rel Req

112.AAL2 Rel Conf

RRC RRC

117.RRC Conn Rel CmpRRC RRC116.RRC Conn Rel Req

NBAP NBAP

119.RL Rel RspNBAP NBAP

118.RL Rel Req

Q.AAL2 Q.AAL2

Q.AAL2 Q.AAL2121.AAL2 Rel Rsp

120.AAL2 Rel Req

RANAP RANAP115.IU Rel Cmp

RANAP RANAP106.IU Rel Cmp


Concepts about Soft Handover

Soft handover: the signals fromdifferent NodeBs are merged in RNC.

Softer handover: the signals from

different cells, but from the same NodeB

are merged in NodeB.


Node B

RNC

AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridge

Soft Handover flow

Core NetworkCore Network


Node B

RNC

AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridge

Merged in NodeB

Soft Handover flowCore NetworkCore Network


Merged in RNC

Node B

RNC

AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridge

Soft Handover flow



Soft Handover flow (SRNC-DRNC)

Merged in SRNC

Node B

AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridge

Serving RNC

Drift RNC



Soft Handover flow (SRN Relocation)

Node B

AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridge

Serving RNC

RNC



Before Handover After Handover

SRNC

NodeBNodeB

SRNC

NodeBNodeB

SRNC

NodeBNodeB

During Handover

Soft Handover flow Intra-RNC

CNCN CN


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

NBAP2. 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 flow add branch in RNC


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 flow Del Branch in RNC


Before HandoverBefore Handover After HandoverAfter Handover

Radio Link can not exist simultaneouslyRadio Link can not exist simultaneously

SRNC

NodeBNodeB

SRNC

NodeBNodeB

Hard Handover (Intra-RNC)

CNCN


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 tohandover

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)


Before HandoverBefore Handover After HandoverAfter Handover

Radio Link can not exist simultaneouslyRadio Link can not exist simultaneously

SRNC RNC

NodeBNodeB

CN

SRNC RNC

NodeBNodeB

Hard Handover (Inter-RNC)

CN


RNSAPRNSAP1. Radio Link Setup Request

UE Node BSource

Node BTarget

RNCSource

RNCTarget

SRNC

RRC RRC10. DCCH : Physical Channel Reconfiguration Complete

RRC7.DCCH : Physical Channel ReconfigurationRRC

6. ALCAP Iur Data Transport Bearer Setup

NBAP NBAP2. Radio Link Setup Request

NBAP NBAP3. Radio Link Setup Response

NBAP NBAP12. Radio Link Deletion Request

NBAP NBAP13. Radio Link Deletion Response

4. ALCAP ub Data Transport Bearer Setup

14. ALCAP Iub Data Transport Bearer Release

RNSAP RNSAP15. Radio Link Deletion Response

16. ALCAP Iur Data Transport Bearer Release

RNSAP5. RL Setup Response

RNSAP

RNSAP11. Radio Link Deletion RequestRNSAP

NBAP NBAP8. Radio Link Failure Indication

RNSAP RNSAP9. Radio Link Failure Indication

Hard Handover (Intra-RNC through Iur)


SRNC Relocation

SRNS

Core Network

Iu

DRNSIur

UE

RNS

Core Network

Iu

SRNS

UE

After SRNS RelocationBefore SRNS Relocation

Cells


Hard Handover with Relocation (CS)


Hard Handover with Relocation (PS)


Forward Handover Forward Handover is sponsored by UE, including cell update and

URA update. URA update is only used UE which is in URA_PCHstate is doing URA re-selection, and check the RRC connection.

When UE is in Cell_FACH and Cell_PCH state

Cell reselection

In service area, the T304 timer is overdue.

When UE is in Cell_PCH or URA_PCH state:

UE is going to upload data (from Cell_PCH or URA_PCH toCell_FACH)

After UE received the paging information from PCCH, UEsponsored cell update.


Inter-system Handover Flow UMTS->GSM


Summary

This chapter mainly explained thebasic signaling flow in UTRAN. Thisis very helpful for the CN signalingflow.

SummarySummary

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