2-OWA000060 UMTS UTRAN Signaling Procedures

Wireless Curriculum Development SectionWireless Curriculum Development Section

ISSUEISSUE

UMTS UTRAN Signaling Procedures1.01.0

Confidential Information of Huawei. No Spreading without Permission.

Security Level: Internal

Course Contents

Chapter 1 UTRAN Network OverviewUTRAN Network Overview

Chapter 2 UTRAN Interface

Chapter 3 Basic Signaling Process



UTRAN Overview

UE Working Mode and State

Serving RNC、 Drift RNC and Control RNC

Source RNC and Target RNC



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 (Cell-DCH, Cell-FACH, Cell-PCH, URA-PC

H) 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)




Cell-DCH In active state

Communicating via its dedicated channels

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.


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



URA-PCH State

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 update UE information only after UE has roamed to

other URA.

A better way to lower the resource occupancy and 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 action ， DTX ， and save power

RRC connection



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 ra

dio resources of a certain cell from the CRNC

Drift RNSs support the Serving RNS 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 DRNCIu Iur



CRNC

The CRNC owns the radio resources of a cell

Dynamical control of power for dedicated channels, within

limits admitted 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

CRNCIub

Node BCell Cell Cell

Node B

...

CNIu



Source RNC/Target RNC

The SRNS Relocation function coordinates the activities when the

SRNS role is to be taken over by another RNS.

Source RNC is the SRNC before SRNs Relocation and Target RNC

is the SRNC after SRNs Relocation

CNCN

Source RNC

TargetRNC

ServingRNC

Iu IuIur RNC



Course Contents

Chapter 1 UTRAN Network Overview


Chapter 3 Basic Signaling Process




Iu InterfaceIu Interface

Uu InterfaceUu Interface

Iub InterfaceIub Interface



Iu Interface System Structure

Core Network (CN)UTRAN

Node B

Node B

Node B

Node B

RNC

Iu Interface

“Iu-BC”

“Iu-CS”

BCDomain

CSDomain

PSDomain

“Iu-PS”

RNC



Iu-CS Interface Protocol Stack Structure

Q.2150.1

Q.2630.1

RANAP Iu UP ProtocolLayer

TransportNetwork

Layer

Physical Layer

TransportUser

NetworkPlane

Control Plane User Plane

TransportUser

NetworkPlane

Transport NetworkControl Plane

RadioNetwork

Layer

ATM

SSCOP

AAL5

SSCOP

SSCF-NNI

AAL2AAL5

MTP3bMTP3b

SCCP

SSCF-NNI



Iu-PS Interface Protocol Stack Structure

SSCF-NNI

SSCOP

AAL5

IP

SCTP

SCCP

SSCF-NNI

MTP3-BM3UA

RANAPIu UP Protocol

Layer

TransportNetwork

Layer

Physical Layer

TransportUser

NetworkPlane

Control Plane User Plane

TransportUser

NetworkPlane

Transport NetworkControl Plane

RadioNetwork

Layer

ATM

AAL5

IP

UDP

GTP-U

Physical Layer

ATM



Iu Interface Protocol Stack Structure

Physical (Full Rate E1 or STM1 Optical)

ATM Lower Layers

AAL2 AAL5 - SAAL NNI

MTP3-B IP

Q.2150

Q.2630

Q.AAL2

Frame Protocol

Unrestricted DigitalVoice Data

SCCP

RANAP

UDP

GTP-U

PacketBearer

CSBearer

PSBearerControl

Signaling

RANAP: Radio Access Network Application Part



Iu Interface Functions(1)

Mobility Management Location Area Report

SRNS Relocation

Hard handover between RNCs and inter-system handover

Radio Access Bearer（ RAB）Management Establishment, Modification and Release of RAB

Iu data transmission normal data transmission

abnormal data transmission

Transparent transmission of UE-CN connection information



Iu Interface Functions（ 2）

Paging

Iu Release

Security Mode Control

Overload Control

Common UE ID（ IMSI）Management

Iu Signaling Trace Management

Iu Interface Abnormality Management

CBS(Cell Broadcast Service) Control



Uu Interface Protocol Stack Structure

L3

cont

rol

cont

rol

cont

rol

cont

rol

LogicalChannels

TransportChannels

C-plane signalling U-plane information

PHY

L2/MAC

L1

RLC

DCNtGC

L2/RLC

MAC

RLCRLC

RLCRLC

RLCRLC

RLC

Duplication avoidance

UuS boundary

BMC L2/BMC

RRCcontrol

PDCPPDCP L2/PDCP

DCNtGC



Uu Interface L1 Functions（ 1） Multiplexing of transport channels and de-multiplexing of encoded

composite channels

Mapping of encoded composite transport channels on physical

channels

Macro-diversity distribution/combining and soft handover execution

Error detection on transport channels and indication to higher layers

FEC encoding/decoding and interleaving/de-interleaving of transport

channels

Rate matching of coded transport channels to physical channels

Power weighting and combining of physical channels

closed-loop power control

open-loop power control



Uu Interface L1 Functions（ 2）Modulation and spreading/demodulation and de-spreading of

physical channels

Synchronization between frequency and time (chip, bit, slot,

frame)

Radio characters measurements (FER, SIR, Interference

power) and indication to higher layers

Compressed mode support

Diversity of Transmission/Receiving

Other base band processing functions



RLC Functions

Segmentation, re-assembly and Padding

Transmission of user data

Error correction using different transport Format

In-sequence delivery of higher layer PDUs, duplicate

detection

Flow control

Sequence number check in Unacknowledged

Mode（ UM） Protocol error detection and recovery

Ciphering

Suspend/resume function



RRC Functions（ 1）Management of system information broadcast

Paging/Notification

RRC connection management （ establish、 reconfig, maintain

and release）Radio Bearer (RB) Management（ establish, reconfig and relea

se） , support NAS services

RRC connection mobility management

initial cell selection

Routing of higher layer PDUs

Control of requested QoS and map into different resources of A

ccess Stratum

Management and control of radio resources



RRC Functions（ 2）Management and control of RB, transport channel and

physical channel

open loop power control

Support of SRNS relocation

Control of UE measurement and measurement report

Ciphering control, protection of integrity

CBS related functions （ BMC configuration ， CBS radio

resource distribute request, support of CBS non-continuous

receiving）



Iub Interface Protocol Stack

Physical (Full Rate E1 or STM1 Optical)

ATM Lower Layers

AAL2 AAL5 - SAAL UNI

NBAP

Q.2150

Q.2630

Q.AAL2

Frame Protocol

RLC / MAC

RRCMS

SignalingCC/MM/RR

Unr

estri

cted

Dig

ital/V

oice

Packet

CSBearer

PSBearer

ControlSignaling

NBAP: Node B Application Part

RRC: Radio Resource Control

RLC: Radio Link Control

MAC: Medium Access Control



Iub Interface Functions(1)

Common Functions Common Transport Channel Management

Iub Common Channel Data Transmission

Logical O&M of Node B （ maintenance functions such as cell

configuration Management ， Fault Management ， Block

Management, etc.） System Information Management

Common Measurement

Resource Verification

Abnormality Management

Timing and Synchronization Management



Iub Interface Functions(2)

Dedicated Functions Dedicated Transport Channel Management

Radio Link(RL) Monitoring

Dedicated Measurement Management

Timing and Synchronization Management

Up-link outer loop Power Control

Iub Dedicated Data transmission

Balance on down-link power drifting

Compressed Mode Control



Course Contents

Chapter 1 UTRAN Network Overview


Chapter 3 Basic Signaling proceduresChapter 3 Basic Signaling procedures



Basic Signaling Procedures

3.1 Call overall procedures

3.2 Network start procedures

3.3 UE registration procedures

3.4 Calling procedures

3.5 Connection mobility management procedures



Call overall ProceduresNetwork side Start

1、 Initialize equipment2、 Process system

broadcast

Step 1Handset Power on

1、 cell reselection2、 Location registration

3、Waiting for call

Step 2Paging UE

Step 3RRC connection

Establish

Step 4NAS signaling

connection establish

Step 5RAB set up

1、 synchronous set up2、 asynchronous set up

Step 6RAB/RB modification

Step 6Transport channel

reconfiguration

Step 6Physical channel

reconfiguration

Step 6Soft/hard handover

Step 6URA update

Step 6Cell update

Step 6Handover with GSM

Step 7RRC connection

release

Step 8Waiting for call again

1、 cell selection2、 wait for call



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 Response

NBAPNBAP



RRC Connection Establishment Flow(CCH)

UE SRNC

RRC: RRC CONNECTION REQUEST

RRC: RRC CONNECTION SETUP

RRC: RRC CONNECTION SETUP COMPLETE

NodeB

UE originate RRC connection setup for registration.SRNC decides to establish RRC connection on common channel,and uses pre-configured common channel resources.



NAS Signaling Establishment Flow

UE SRNC CN

RRC£ ºINITIAL DIRECT TRANSFER

RANAP: INITIAL UE MESSAGE

RRC£ ºDTRANAP£ ºDT

RANAP£ ºDT

RRC£ ºDT

UE changes DT messages with CN, such as Authentication, connection establishment, location registration, etc.



RRC Connection Release Flow(CCH)

UE NodeB SRNC

IU RELEASE COMMAND

IU RELEASE COMPLETE

RRC£ ºRRC CONNECTION RELEASE

RRC£ ºRRC CONNECTION RELEASE COMPLETE

CN

In registration process, UE does not use dedicated user plane resources. Instead, it release signaling link directly. Thus registration procedure ends.



Paging Flow (UE in Idle State or PCH State)

CNSRNCUE

RANAP£ ºPAGING

RRC£ ºPAGING TYPE 1

CN sends paging message and specifies UE and paging area. （ CN is responsible for paging message re-send） . SRNC sends relevant paging message according to UE state.



Paging Flow (connection mode)

CN sends paging message and specifies UE and paging area. （ CN is responsible for paging message re-send） . SRNC sends relevant paging message according to UE state.

UE ServingRNC

CN

RRCRRC2. DCCH : Paging

RANAP RANAP1. Paging



RRC Connection Establishment Flow(DCH)

5. Downlink Synchronisation

UE Node B Serving RNS

Serving RNC

DCH-FP DCH-FP

Allocate RNTI Select L1 and L2

parameters

RRC RRC

1. CCCH : RRC Connection Request

NBAP NBAP

3. Radio Link Setup Response

NBAP NBAP

2. Radio Link Setup Request

RRC RRC

7. CCCH : RRC Connection Setup

Start RX description

Start TX description

4. ALCAP Iub Data Transport Bearer Setup

RRC RRC

9. DCCH : RRC Connection Setup Complete

DCH-FP DCH-FP 6. Uplink Synchronisation

NBAP NBAP

8. Radio Link Restore Indication



NAS Signalling Connection Establishment

The NAS signalling connection between UE and CN can now be used for NAS message transfer

UE ServingRNC

CN

1. RRC Connection Establishment

RRCRRC2. DCCH : Initial Direct Transfer

RANAP RANAP3. Initial UE Message



RAB Establish Flow(DCH-DCH, synchronous)

UE SRNCNodeB CN RAB ASSIGNMENT REQUEST

ALCAP EstablishRL RECONFIG PRE

RL RECONFIG READY

ALCAP Establish, synchronization

RRC： RB SETUP

RRC： RB SETUP COMPLETERAB ASSIGNMENT RESPONSE

RL RECONFIG COMMIT

There are more than one ALCAP establish procedures on Iu Interface, more than one user plane RABs can be established simultaneously. After user plane establish, UE enters call connection.



RAB Establish Flow(DCH-DCH, asynchronous)

UE SRNCNodeB CNRAB ASSIGNMENT REQUEST

ALCAP EstablishRL RECONFIG REQ

RL RECONFIG RESP


RRC： RB SETUP

RRC： RB SETUP COMPLETE

RAB ASSIGNMENT RESPONSE



Transport Channel Reconfig Flow(Synchronised )

UE NodeB SRNC

RL RECONFIG PREPARE

RL RECONFIG READY

RL RECONFIG COMMIT

TRANSPORT CHANNEL RECONFIG

TRANSPORT CHANNEL RECONFIG COMPLETE


ALCAP Release



Physical Channel Reconfig Flow

UE NodeB SRNC

RL RECONFIG PREPARE

RL RECONFIG READY

RL RECONFIG COMMIT

PHYSICAL CHANNEL RECONFIG

PHYSICAL CHANNEL RECONFIG COMPLETE



RRC Release Flow（ DCH）UE NodeB SRNC CN

IU RELEASE COMMAND

IU RELEASE COMPLETE

ALCAP ReleaseRRC： RRC CONNECTION RELEASE

RRC： RRC CONNECTION RELEASE COMPLETE

RL DELETION

RL DELETION RESPONSE

ALCAP Release

Release procedure is usually originated by CN. But if UE is faulty, SRNC can also request release.



Overall Called Signaling Flow

Downlink Synchronisation

UE Node BServing RNS

ServingRNC

DCH-FPDCH-FP

RRCRRC

CCCH : RRC Connection Request

NBAP Radio Link Setup Response

NBAP

NBAP Radio Link Setup Request

CCCH : RRC Connection Setup

Start RX

Start TX

RRC

DCH-FPDCH-FPUplink Synchronisation

NBAP

Q.AAL2Q.AAL2

Q.AAL2 Establish Request

Establish Confirm

CN

RRC

Q.AAL2

RANAPRANAPPaging

Paging




ServingRNC

CN

RRCDCCH : RRC Connection Setup Complete

Inital Direct Transfer

RRC

RANAPRANAPInitial UE Message

RANAPRANAP

DCCH

Direct Transfer

RANAPRANAP Direct Transfer

:

Direct Transfer DCCH ::

Direct Transfer DCCH ::

RRCDownlink

RRC

RRC

RRC

Uplink

RRC

RRC

RRC

(Paging Response)

(Setup)

RAB Assignment RequestRANAP

Establishment( )

(Call Confirm)

RANAP

RLC RLCDCCH : RRC Connection Setup Complete ack





ServingRNC CN

RANAPQ.AAL2Q.AAL2


Establish Confirm

Q.AAL2

NBAPPrepare NBAP

Radio Link Reconfiguration

NBAPRadio Link ReconfigurationNBAP Ready




UENode B

Serving RNS ServingRNC

CN

DCCH : Radio Bearer Setup

DCCH : Radio Bearer Setup Complete

Q.AAL2Q.AAL2


Establish Confirm

Q.AAL2

Downlink Synchronisation

Uplink Synchronisation

Radio Link Reconfiguration

NBAP

NBAP

NBAP

NBAP

NBAP

NBAP

Apply new transport format set

RRC

RRC

RRC

RRC

RAB Assignment ResponseRANAP RANAPEstablishment(

Commit

DCCH : Radio Bearer Setup Complete ackRLCRLC




UENode B

Serving RNSServingRNC

CN

RRC



(Alerting)

(Connect)

RRC

RANAPRANAP Direct Transfer (Connect Acknowledge)

RRC

RANAPRANAP Direct Transfer (Rlease Complete)


(Release)

RANAPRANAP Direct Transfer (Disconnect)

RRC

Direct Transfer

DCCH :: Uplink Direct Transfer RRC

DCCH : DownlinkRRC

Direct Transfer

DCCH : DownlinkRRC Direct Transfer

Direct Transfer DCCH : DownlinkRRC RRC

DCCH :: UplinkRRC




UENode B

Serving RNS ServingRNC

CN

RANAPRANAP Iu Release Command

Q.AAL2Q.AAL2

Q.AAL2Q.AAL2 Release Request

Release Complete

RANAPRANAPIu Release Complete

Q.AAL2Q.AAL2

Q.AAL2Q.AAL2 Release Request

Release Complete

DCCH : RRC Connection

DCCH : RRC Connection

Release

ReleaseComplete

NBAP Radio Link Deletion

NBAP Radio Link Deletion

NBAP

NBAP

RRC

RRC

Complete




Soft Handover

Macro diversity is a operation state in which a User

Equipment simultaneously has radio links with two or more

UTRAN access points. The aim is to improve quality of the

radio connection or provide seamless connection.

Active Set is a set of radio links simultaneously involved in a

specific communication service between an UE and a

UTRAN access point.



Soft Handover Illustration (Intra RNC)

Before Soft Handover After Soft Handover

CN

SRNC

NodeBNodeB

CN

SRNC

NodeBNodeB

CN

SRNC

NodeBNodeB

During Soft Handover



Soft Handover Illustration (Inter-RNC)

Before Soft Handover After Soft Handover

Radio Link(RL) is added and deleted simultaneously

CN

SRNC RNC

NodeB NodeBNodeB

CN

SRNC RNC

NodeB NodeBNodeB



Soft Handover - Radio Link Addition

UE Node B

Drift RNS Drift RNC

Serving RNC

DCH-FP DCH-FP 8. Downlink Synchronisation

RNSAP RNSAP

1. Radio Link Setup Request

Start TX description

NBAP NBAP

2. Radio Link Setup

Request

RNSAP RNSAP


NBAP NBAP


Start RX description

Decision to setup new RL

RRC RRC

11. DCCH : Active Set Update Complete

RRC RRC

10. DCCH : Active Set Update

[Radio Link Addition]

ALCAP Iur Bearer Setup 5. ALCAP Iub Bearer Setup

DCH-FP DCH-FP 9. Uplink Synchronisation

RNSAP RNSAP


NBAP NBAP




Soft Handover - Radio Link Deletion

UE Node BDrift RNS

DriftRNC

ServingRNC

RRCRRC2. DCCH : Active Set Update Complete

Decision to deleteold RL

RNSAP RNSAP

3. Radio Link DeletionRequest

NBAP NBAP

4. Radio Link DeletionRequest

RNSAP RNSAP

6. Radio Link DeletionResponse

NBAP NBAP

5. Radio Link DeletionResponse

Stop RX and TX

RRCRRC1. DCCH : Active Set Update

[Radio Link Deletion]

ALCAP Iur Bearer Release7. ALCAP Iub Bearer Release



Hard Handover Illustration (Intra-RNC)

Before Har Handover 7 After Hard Handover

Radio Link(RL)cannot exist simultaneously

CN

SRNC

NodeBNodeB

CN

SRNC

NodeBNodeB



Hard Handover Illustration (Inter-RNC)

Before Hard Handover After Hard Handover

Radio Link(RL)can’t exist simultaneously

CN

SRNC RNC

NodeBNodeB

CN

SRNC RNC

NodeBNodeB



RNSAPRNSAP1. Radio Link Setup Request

UE Node B Source

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 via Iur (DCH on Iur)



Hard Handover Flow（ UMTS->GSM）

MAP/E MAP/E

2. PrepareHandover

BSSMAP BSSMAP4. Handover Request Ack

RANAP RANAP

13. Iu ReleaseComplete

BSSMAP BSSMAP

3. Handover Request

MAP/E MAP/E5. Prepare Handover

Response

RANAP RANAP

6. Relocation Command

BSSMAP BSSMAP

8. Handover Detect

BSSMAP BSSMAP

10. Handover Complete

MAP/E MAP/E

11. Send End Signal Request

MAP/E MAP/E

14. Send End Signal Response

RANAP RANAP1. Relocation Required

UE Node BRNC

Serving CN MSC BSC BTS

RRC7. DCCH : Inter-System Handover Command

RRC

RR9. Handover Complete

RR

RANAP RANAP

12. Iu Release Command



Forward Handover

Forward Handover, including CELL UPDATE and URA UPDATE, is

originated by UE. URA UPDATE procedure is only used for UE under

URA_PCH state to process URA reselection, and to check if RRC

connection is right.

For UE under CELL_FACH and CELL_PCH state cell reselection needed

In specific SA(Service Area)， Timer T305 timed out (this timer is defined in

system broadcast message)

For UE under CELL_PCH and URA_PCH state transfer data on up link needed (enter CELL_FACH state)

upon receiving paging message on PCCH, originate cell update

CELL UPDATE process can be used to re-establish unrecoverable errors of

RLC entity（ losing connection） , and to monitor RRC connection state.



Cell Update with SRNS relocation

UE Source RNC

CN Target RNC

2. Uplink Signalling Transfer Indicatio n

[new C - RNTI, D - RNTI,

UL message]

1. CCCH: Cell Update

[Cell Update Cause,U - RNTI, Measured results on PRACH]

RRC - relay RRC

RNSAP RNSAP

4. DCCH: Cell Update Confirm

[S - RNTI, SRNC - ID, new S - RNTI, new SRNC - ID, new C - RNTI]

RRC RRC

5. DCCH : UTRAN Mobility Information Confirm RRC

RRC

3. Serving RNC Relocation



Cell Update via Iur without SRNS relocation

UE DRNC source DRNC

target SRNC

RNSAP RNSAP 8. Common Transp. Channel Resources Release

RNSAP RNSAP 2. Uplink Signalling Transfer

Indication [new C-RNTI,D-RNTI,

UL message]

RNSAP 3. Common Transp. Channel Resources

Initialization Request

RNSAP

RRC 1. CCCH: Cell Update

RRC-relay

RRC 6. DCCH: Cell Update Confirm RRC

RRC 7. DCCH: UTRAN Mobility Information Confirm

RRC

RNSAP RNSAP

4. Common Transp. Channel Resources Initialization Response

5. ALCAP Iur bearer setup



Inter-RNS URA Update via Iur without SRNS relocation

UETargetRNC

5.CCCH: URA Update Confirm

SourceRNC

2.Uplink Signaling Transfer Indication

ServingRNC

[new C-RNTI,D-RNTI, UL message]

1.CCCH: URA Update

[U-RNTI, URA update cause]RRC-relayRRC

3. Decision Not toperform SRNS

relocation

RRC RRC-relay

RNSAP

RNSAP

4. Downlink Signaling Transfer Request

RNSAP

RNSAP

2-OWA000060 UMTS UTRAN Signaling Procedures

Documents

Transcript of 2-OWA000060 UMTS UTRAN Signaling Procedures