C19 WCDMA RAN Interface and Procedure

1

WCDMA RAN Interface and Procedure

2

Course ContentsCourse Contents

Chapter 1 UTRAN Network ArchitectureUTRAN Network Architecture

Chapter 2 UTRAN Interface Protocol and FunctionsUTRAN Interface Protocol and Functions

Chapter 3 Basic Signaling Process

3

UMTS System Architecture

Iu

UTRAN

UE

Uu

UTRAN ： UMTS Terrestrial Radio Access NetworkCN ： Core NetworkUE ： User Equipment

CN

4

UTRAN System Architecture

RNS

RNC

RNS

RNC

Core Network

Node B Node B Node B Node B

Iu Iu

Iur

Iub IubIub Iub

5

Common Protocol Model of UTRAN Interfaces

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)

The principle of interface protocol architecture is the logical mutual-independence between layers and planes. Protocol layers of a specified protocol version, or even all layers in a plane can be modified if required in the future.

6

Basic NotionsBasic Notions

UE Working Mode and State

Serving RNC 、 Drift RNC and Control RNC

Source RNC and Target RNC

7

UE Working Modes and states UE Working Modes and states

Idle Mode

In standby state with no service conducted

No connection to UTRAN

There is no information related to this UE in UTRAN

Connected Mode (Cell-DCH, Cell-FACH, Cell-PCH, URA-

PCH)

Cell-DCH

In active state

Communicating via its dedicated channels

UTRAN knows which cell UE is in.

8

Cell-FACH and Cell-PCH State 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

9

URA-PCH StateURA-PCH State

URA-PCH

No data to be transmitted or received.

Monitor PICH. to enter the non-consecutive state.

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

10

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

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SRNC/DRNCSRNC/DRNC

In WCDMA system ， notion of SRNC/DRNC is introduced because the

existence of Iur Interface

SRNC and DRNC are related to a specific UE. They can be regarded as l

ogical notions

In brief, the RNC directly connected to CN and controlling all the UE’s res

ources is called SRNC(serving RNC) of this UE

The RNC with no connection to CN but only providing resources for UE is

called DRNC(Drift RNC) of this UE

A UE in connection state has at least and only one SRNC, but can has 0

or multiple DRNCs

CN

SRNC DRNCIu

Iur

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CRNCCRNC

CRNC is related to a specific NodeB (or Cell)

The RNC connected directly to a NodeB and controlling the usage of

its resources is called the CRNC of this NodeB

There is and only one Controlling RNC for any NodeB

CRNC is in charge of the allocation and usage of NodeB’s resources

CRNC

Iub

Node BCell Cell Cell

Node B

...

CN

Iu

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Source RNC/Target RNCSource RNC/Target RNC

SRNC Relocation is the process of switching the SRNC of a specifi

c UE.

Source RNC is the SRNC before SRNC Relocation and Target RN

C is the SRNC after SRNC Relocation

Source RNC and Target RNC refer to different RNCs during a SR

NC Relocation process

CNCN

Source RNC

TargetRNC

ServingRNC

Iu IuIur RNC

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Chapter 1 UTRAN Network Architecture

Chapter 2 UTRAN Interface Protocol and Functions

Chapter 3 Basic Signaling Process

15

UTRAN Interface Protocols and FunctionsUTRAN Interface Protocols and Functions

Iu Interface

Iur Interface

Iub Interface

Uu Interface

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Iu Interface System Structure

Core Network (CN)UTRAN

Node B

Node B

Node B

Node B

RNC

Iu Interface

Iu-CS

CSDomain

PSDomain

Iu-PS

RNC

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Iu-CS Interface Protocol Stack Structure

Q.2150.1

Q.2630.1

RANAP Iu UP ProtocolLayer

TransportNetwork

Layer

Physical Layer

TransportUser

NetworkPlane


TransportUser

NetworkPlane


RadioNetwork

Layer

ATM

SSCOP

AAL5

SSCOP

SSCF-NNI

AAL2AAL5

MTP3bMTP3b

SCCP

SSCF-NNI

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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


TransportUser

NetworkPlane


RadioNetwork

Layer

ATM

AAL5

IP

UDP

GTP-U

Physical Layer

ATM

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Iu Interface Functions(1)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

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Iu Interface Functions(2)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

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UTRAN Interfaces Protocols and Functions

Iu Interface

Iur Interface

Iub Interface

Uu Interface

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Iur Interface Protocol Stack Structure

SSCF-NNI

SSCOP

MTP3-B

AAL5

IP

SCTP

SCCP

AAL5

SSCF-NNI

STC (Q.2150.1)

RNSAP Iur DataStream(s)

TransportNetwork

Layer

Physical Layer

TransportUser

NetworkPlane


TransportUser

NetworkPlane


RadioNetwork

Layer

ATM

ALCAP(Q.2630.1)

AAL2

SSCF-NNI

SSCOP

MTP3-B

IP

SCTPSSCF-NNI

M3UA M3UA

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Iur Interface Functions(1)Iur Interface Functions(1)

Support Basic Mobility Functions between RNCs

Support SRNC relocation

Cell Update and URA Update between RNCs

Paging between RNCs

Protocol Error Report

Dedicated Channel Functions

Establish, Modify or Release Dedicated Channels in DRNC

during handover

Transmission of DCH TB(Transmission Block) on Iur

Management of RL(Radio Link) in DRNS by Dedicated

Measurement Procedure and Filter Control

RL Management ， Compressed Mode Management

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Iur Interface Functions(2)Iur Interface Functions(2)

Common Channel Functions

Establishment, Deletion of Common transport Channels on Iur

Common Transport Channels are used to Transmit UE informati

on which is in Common Channel state in DRNC

Separate MAC-d From MAC-c

Traffic Control Between MAC-d and MAC-c

Global Resource Management

Common Measurement Between RNCs

Transmission of Node B Timing Information between RNCs

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UTRAN Interfaces Protocols and FunctionsUTRAN Interfaces Protocols and Functions

Iu Interface

Iur Interface

Iub Interface

Uu Interface

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Iub Interface Protocol Stack

Node BApplication Part

(NBAP)

AAL Type 2

ALCAP

TransportLayer

Physical Layer

RadioNetworkLayer

Radio NetworkControl Plane

TransportNetwork

Control Plane

DC

H F

P

RA

CH

FP

ATM

DS

CH

FP

AAL Type 5

User Plane

SSCF-UNI

SSCOP

AAL Type 5

SSCF-UNI

SSCOP

Q.2630.1

Q.2150.2

FA

CH

FP

PC

H F

P

US

CH

FP

CP

CH

FP

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Iub Interface Functions(1)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

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Iub Interface Functions(2)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

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UTRAN Interfaces Protocols and FunctionsUTRAN Interfaces Protocols and Functions

Iu Interface

Iur Interface

Iub Interface

Uu Interface

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Uu Interface Protocol Stack Structure

L3

co

ntr

ol

co

ntr

ol

co

ntr

ol

co

ntr

ol

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

RRC

control

PDCPPDCP L2/PDCP

DCNtGC

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Uu Interface L1 Functions(1)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

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Uu Interface L1 Functions(2)Uu Interface L1 Functions(2)

closed-loop power control

open-loop power control

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

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MAC: Medium Access Control

AS

L2

GC Nt DC

RRC(L3)

RLC

PHY(L1)

PDCP BMC

MAC

Logical Channels

Transport Channels

Control SAP's

Control SAP

Radio (Access) Bearers

Physical Channels

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MAC FunctionsMAC Functions

mapping between logical channels and transport channels

selection of appropriate Transport Format for each Transport Channel de

pending on instantaneous data rate

priority handling between data flows of one UE

priority handling between UEs by dynamic scheduling

identification of UEs on common transport channels

multiplexing/demultiplexing of higher layer PDUs into/from transport bloc

k sets delivered to/from the physical layer on common and dedicated tra

nsport channels

traffic volume monitoring

Dynamic Transport Channel type switching

ciphering for transparent RLC

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MAC: Mapping of Logical Channels(UE)

{XOR}

Transport Channels

(L1 Characteristics Dependent)

PCH BCH FACH RACH DCH

S-CCPCHP-CCPCHPhysical

ChannelsPRACH DPDCH

Logical Channels

(Data Dependent)

PCCH

DCCH

DTCH

DecicatedLogical

Channel

CipherOn

BCCH CCCH CTCH

Higher Layer data

PagingPagingSystem

InfoSystem

InfoSignalingSignaling

CellBroadcast

Service

CellBroadcast

Service

Signalingand

User data

Signalingand

User data

DTCHDTCH

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MAC: Transport Format Selection(1)

Control immediate bit rate by means of changing traffic per TTI(Transmission Time Interval, is multiple of 10ms)

Transport Block (TB): The basic unit exchanged between L1 and MAC Transport Block Size: the number of bits in a Transport Block Transport Block Set: A set of TBs transmitted in a TTI Transport Block Set Size: the number of bits in a Transport Block Set

Transport Block, TB#1

TB#2

TB#n

Transport Block Size

Transport Block Set

Transport Block Set Size = Transport Block Size x N

Transport Time Interval, TTI t

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MAC: Transport Formation Selection(2)MAC: Transport Formation Selection(2)

Transport Format (TF) defines Transport Block Set (Transport Block Size,

Transport Block Set Size,TTI,FEC type,size of CRC)

Transport Format Set (TFS): Possible TF combinations of a transport channel.

MAC will chose a TF during every TTI

Transport Format Combination (TFC): Determined TF combination in each TTI,

each transport channel

Transport Format Combination Set (TFCS): define all possible TFC combination

method. Thus MAC can process dynamic transport rate control in different

transport channels

TFCS

TrCH#1

TFS

TF

TrCH#2TrCH#3TrCH#4

TFC

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RLC: Radio Link Control

AS

L2

GC Nt DC

RRC(L3)

RLC

PHY(L1)

PDCP BMC

MAC

Control SAP's

Control SAP


Logical

Channels

Transport Channels

PhysicalChannels

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RLC FunctionsRLC Functions

Segmentation, reassembly 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

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PDCP： Packet Data Convergence ProtocolBMC： Broadcast/Multicast Control

AS

L2

GC Nt DC

RRC(L3)

RLC

PHY(L1)

PDCP BMC

MAC

Control SAP's

Control SAP


Logical

Channels

Transport Channels

PhysicalChannels

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PDCP FunctionsPDCP Functions

Mapping of network PDU from network protocol to RLC

protocol entity.

header compression and de-compression in order to

reduce the redundant control information in higher layer

data, thus enhance the transport efficiency in air interface

buffering and retransmit of higher layer data

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BMC FunctionsBMC Functions

Storage of cell broadcast message

Monitoring of traffic volume and CBS (Cell Broadcast

Service) radio resource request

BMC message dispatching

Transport BMC message to UE

Transport BMC message to higher layer

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RRC: Radio Resource Control

AS

L2

GC Nt DC

RRC(L3)

RLC

PHY(L1)

PDCP BMC

MAC

Control SAP's

Control SAP


Logical

Channels

Transport Channels

PhysicalChannel

s

44

RRC Functions(1)RRC Functions(1)

Management of system information broadcast

Paging/Notification

RRC connection management （ establish 、 reconfig, maintai

n and release ）Radio Bearer (RB) Management （ establish, reconfig and rele

ase ） , 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

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RRC Functions(2)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 ）

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Chapter 1 UTRAN Network ArchitectureChapter 1 UTRAN Network Architecture

Chapter 2 UTRAN Interface Protocol and FunctionsUTRAN Interface Protocol and Functions

Chapter 3 Basic Signaling ProcessChapter 3 Basic Signaling Process

47

Basic Signaling Procedures

Call overall process

Network start process

UE registration process

Call process, soft handover and hard handover

process

Connection mobility management process

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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 3

RRC connection

Establish

Step 4

NAS 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

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Basic Signaling Process





process


50

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

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process


52

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.

53

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.

54

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.

55

Basic Call ProcessesBasic Call Processes





process


56

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.

57

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

58

RRC Connection Establishment Flow(DCH)

UE SRNC

RRC: RRC CONNECTION REQUEST

RRC: RRC CONNECTION SETUP

RRC: RRC CONNECTION SETUP COMPLETE

NodeB

RL SESETUP REQUEST

RL SETUP RESPONSE

ALCAP Establish, synchronization

UE send RRC connect request containing UE identify, ability, cause on CCCH. If the condition is met, SRNC will configure NodeB according to the requirement, and establish its path to Node B, then send RRC connection setup message on CCCH channel, and wait for response from UE on DCCH.

59

NAS Signaling Establish Flow

UE SRNC CN

RRC£ ºINITIAL DIRECT TRANSFER

RANAP: INITIAL UE MESSAGE

RRC£ ºDTRANAP£ ºDT

RANAP£ ºDT

RRC£ ºDT

UE exchange DT messages with CN, such as authentication,service request, connection establish, etc.

60

RAB Establish Flow(DCH-DCH, synchronous)

UE SRNCNodeB CN

RAB ASSIGNMENT REQUEST

ALCAP Establish

RL RECONFIG PRE

RL RECONFIG READY


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.

61

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

62

RAB Establish Flow(RA/FA-RA/FA)

UE SRNCNodeB CNRANAP: RAB ASSIGNMENT REQUEST

ALCAP Establish

RRC ： RB SETUP


RANAP ： RAB ASSIGNMENT RESPONSE

63

RAB Establish Flow(RA/FA-DCH)

RANAP: RAB ASSIGNMENT REQUEST

ALCAP Establish

RRC ： RB SETUP


RANAP ： RAB ASSIGNMENT RESPONSE

RL SETUP REQ

RL SETUP RESP


64

RAB Reconfig Flow

UE NodeB SRNC

RL RECONFIG PREPARE

RL RECONFIG READY

RL RECONFIG COMMIT

RB RECONFIG

RB RECONFIG COMPLETE


ALCAP Release

CN

RAB ASSIGNMENT REQ

ALCAP Establish

RAB ASSIGNMENT RESP

ALCAP Release

65

Transport Channel Reconfig Flow

UE NodeB SRNC

RL RECONFIG PREPARE

RL RECONFIG READY

RL RECONFIG COMMIT

TRANSPORT CHANNEL RECONFIG

TRANSPORT CHANNEL RECONFIG COMPLETE


ALCAP Release

66

Physical Channel Reconfig Flow

UE NodeB SRNC

RL RECONFIG PREPARE

RL RECONFIG READY

RL RECONFIG COMMIT

PHYSICAL CHANNEL RECONFIG

PHYSICAL CHANNEL RECONFIG COMPLETE

67

Notions Related to Soft HandoverNotions Related to Soft Handover

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.

68

Soft Handover Illustration (Intra RNC)

Before Soft Handover After Soft Handover

CN

SRNC

NodeBNodeB

CN

SRNC

NodeBNodeB

CN

SRNC

NodeBNodeB

During Soft Handover

69

Soft Handover Flow (Intra RNC add branch)

Decision to setupnew RL

7. DCCH : Active Set Update Complete

6.DCCH: Active Set Update Command

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 SynchronizationDCH-FP

DCH-FP5.Uplink SynchronizationDCH-FP


RRC

RRC

RRC

RRC

70

Soft Handover Flow (Intra-RNC delete branch)

Decision to deletea RL

2. DCCH : Active Set Update Complete

1.DCCH: Active Set Update Command

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

71

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

72

Soft Handover Flow (Inter-RNC)

7. Uplink Synchronization

RNSAP RNSAP

1. Radio Link Setup Request

Start TX description

RNSAP RNSAP

4. Radio Link SetupResponse

NBAP NBAP2. Radio Link Setup Request

NBAP NBAP3. Radio Link Setup Response


Decision to setupnew RL and

release old RL

NBAP 10. Radio Link Deletion Request

NBAP NBAP11. Radio Link Release Response

Stop RX and TX

12. ALCAP Iub Data Transport Bearer Release

RRCRRC9. DCCH : Active Set Update Complete

RRCRRC 8. DCCH: Active Set Update Command

[Radio Link Addition & Deletion]

NBAP

UE Node BDrift RNS

Node BServing RNS

Drift RNC Serving RNC

ALCAP Iur Bearer Setup5. ALCAP Iub Data Transport Bearer Setup

DCH-FPDCH-FP

DCH-FPDCH-FP

6. Downlink Synchronization

73

Hard Handover Illustration (Intra-RNC)

Before Har Handover 7 After Hard Handover

Radio Link(RL)cannot exist simultaneously

CN

SRNC

NodeBNodeB

CN

SRNC

NodeBNodeB

74

Hard Handover Flow (Intra-RNC)

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 SynchronizationDCH-FP

DCH-FP5.Uplink SynchronizationDCH-FP

NBAP

NBAP

NBAP


75

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

76

Hard Handover Flow (Inter-RNC via Iur interface)

RNSAPRNSAP1. Radio Link Setup Request

UE Node B

Source

Node BTarget

RNCSource

RNCTarget

SRNC

RRCRRC

10. DCCH : Physical Channel Reconfiguration Complete

RRC7.DCCH : Physical Channel Reconfiguration

RRC

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


RNSAP RNSAP15. Radio Link Deletion Response

16. ALCAP Iur Data Transport Bearer Release

RNSAP5. RL Setup Response

RNSAP

RNSAP11. Radio Link Deletion Request

RNSAP

NBAP NBAP8. Radio Link Failure Indication

RNSAPRNSAP

9. Radio Link Failure Indication

77

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. Connection to UE is released first, then the connection to Node B. The release of RRCis the end of call.

78






process


79

Connection mobility management processes

Cell update process

URA update process

Inter-system handover process

80

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.

81

Cell Update Flow

UE DRNCSource

DRNCTarget

SRNC

RNSAP RNSAP8. Common Transp. Channel Resources Release

RNSAPRNSAP

2. Uplink Signaling TransferIndication

RNSAP

3. Common Transp. Channel ResourcesInitialization Request

RNSAP

RRC1. CCCH: Cell Update

RRC-relay

RRC6. DCCH: Cell Update Confirm

RRC

RRC7. DCCH: RNTI Relocation Complete

RRC

RNSAPRNSAP

4. Common Transp. Channel Resourcesinitialization Response

5. ALCAP Iur bearer setup

82

URA Update Flow

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

83

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

RRC

7. DCCH : Inter-System Handover Command

RRC

RR9. Handover Complete

RR

RANAP RANAP

12. Iu Release Command

84

Hard Handover Flow（ GSM->UMTS）

RANAP RANAP

3. RelocationRequest

BSSMAP BSSMAP

1. HandoverRequired

RANAP RANAP

4. RelocationRequest Ack

MAP/E MAP/E

5. Prepare HandoverResponse

MAP/E MAP/E

2. PrepareHandover

BSSMAP BSSMAP

6. HandoverCommand

MAP/E MAP/E

11. Send End SignalRequest

BSSMAP BSSMAP

12. ClearCommand

BSSMAP BSSMAP

13. ClearComplete

RANAP RANAP

10. Relocation Complete

UE Node B RNCTarget

CN MSC BSC BTS

MAP/E MAP/E

14. Send End SignalResponse

RRC9. DCCH : Handover Complete

RRC

RR

7. Handover Command

RR

RANAP RANAP

8. RelocationDetect

85

Cell Reselection Flow（ UMTS->GPRS）

UE CN

2. UE Access GPRS system

ServingRNC

RANAP RANAP

4. Iu Release Command

RANAP RANAP

4. Iu Release Complete

GPRS

1. UE releases connection with RNC

3. Inter-system information exchangedata transfer

86

Cell reselection Flow（ GPRS->UMTS）

UE ServingRNC

1. UE Access UMTS system(RNC)

CN

2. Make signaling connection with CN

3. User plane bearers set up

GPRS

4. Inter-system information exchangedata transfer

87

Documents

C19 WCDMA RAN Interface and Procedure