02-OWA210001 WCDMA UTRAN Interface and Signaling Procedure ISSUE 1.1

8/8/2019 02-OWA210001 WCDMA UTRAN Interface and Signaling Procedure ISSUE 1.1

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

WCDMA UTRANInterface and

SignalingProcedure


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Page2Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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 inWCDMA Network


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UMTS Construction

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

Iu

UTRAN

UE

Uu

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

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

RLCRLCRLC

RLC

RLCRLC

RLC

Duplication avoidance

UuS boundary

BMC L2/BMC

control

PDCPPDCP L2/PDCP

DCNtGC

RadioBearers

RRC

c o n

t r o

l


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General Protocol Mode for UTRAN Terrestrial Interface

The structure is based on the principle that the layersand 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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General Protocol Mode for UTRAN Terrestrial Interface

The structure is based on the principle that the layersand planes are logically independent of each other.

ApplicationProtocol

DataStream(s)

ALCAP(s)

TransportNetwork

Layer

Physical Layer

SignallingBearer(s)

TransportUser

NetworkPlane


TransportUser

NetworkPlane


RadioNetwork

Layer

SignallingBearer(s)

DataBearer(s)


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RNL Control Plane ApplicationProtocol

NBAP Node B Application PartRANAP Radio Access Network Application PartRNSAP Radio Network Subsystem Application PartRRC Radio Resource Control

Node B

RNC

CN

UE

RANAP

NBAP

RNSAP RRC RNC


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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-BM3UA

Physical Layer


ATM

AAL5

IP

UDP

GTP-U

Physical Layer

ATM

TransportNetwork

Layer


RadioNetwork

Layer RANAP Iu UP Protocol

Layer




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Iub Interface

Node BApplication Part

(NBAP)

AAL Type 2

ALCAP

TransportLayer

RadioNetwork

Layer

Radio NetworkControl Plane

TransportNetwork

Control Plane

DCH FP

RACH FP

ATM

DSCH FP

AAL Type 5

User Plane

SSCF-UNI

SSCOP

AAL Type 5

SSCF-UNI

SSCOP

Q.2630.1

Q.2150.2

FACH FP

PCH FP

USCH FP

CPCH FP

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

TransportNetwork

Layer


Radio

NetworkLayer




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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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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 onwhich 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 inconnected 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 cellsCell 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

When at least one signalling connection exists, the UE is inconnected 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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RNTI - Radio Network Temporary Identifier

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

NBAPNBAP

NBAP

NBAP

NBAP

NBAPNBAP

NBAP

NBAP

NBAP

NCP: Resource Status Ind

NCP: Audit Req

NCP: Cell Setup Req

NCP: Cell Setup Rsp

NBAPNBAP NCP: Comm TrCh Setup ReqNBAPNBAP 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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Introduction of SystemInformationMIB

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

SB1Contains scheduling information for SIB

SB2 Contains 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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Introduction of SystemInformation

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

SIB5Contains parameters for the common physical channels of the cell

SIB6 Contains 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

SIB12 Contains measurement controlling information in connecting mode

SIB13 Contains 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 Type1

System information type 1 The NAS system information

CS domain DRX K 6 then DRX period is 2^k =

2 ^ 6 = 64 TTI = 640 msPS domain DRX K 6 then DRX period is 2^k =2 ^ 6 = 64 TTI = 640 ms

The different timers for UE inconnecting mode and idlemode.


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System info type 2

URA information


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The references for cellselection and re-selection

Qhyst2sSintrasearchSintersearchSinterRatsearchQqualminQrxlemin

T reselectionMax Allowed UE TX power


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The configuration informationfor the following physicalchannels and the counterparttransport channels

PICH

AICH

PCCPCH

PRACH

SCCPCH


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System Information Block Type7 and 11

System info type 7Including the UL interference level which is used for openloop power control:

Preamble_Initial_Power=Primary CPICH DL TX power -

CPICH_RSCP + UL interference + Constant ValueIncluding the Expiration Time Factor which is used forrefreshing the SIB7 periodically

System info type 11

The neighbor cell information for cell re-selection in IDLEmode.


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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

PS Paging Wi thout RRC Connecti on for CS

SGSNUENodeB

1 RNC1

RANAP

NodeB2 RNC 2

RANAP

MSC /VLR

RANAP

RANAPPagi ng

Paging

RRC

RRCPaging Type 1RRC

Pagi ng Type 1

UE RNC 1

RANAP

MSC /VLR

RANAPPaging

SGSN

PS Paging With RRC Connection for CS

RRCConnectionEstablish

NodeB1

RRCPagi ng Type 2RRC


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Paging Caused by CN

The paging information type which is sent by UTRANis decided by UE mode.

If UE is in the CELL_FACH or CELL_DCH UTRAN

send paging type 2. In other modes, the paginginformation is type 1 and UE can use DTX method to

detecting PICH.


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Paging Caused by UTRAN

UE RNC1NodeB1

RRCPagi ng Type 1RRC


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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 followingbasic signaling flows:

RRC connection flow

Iu interface signaling flow

Authentication flow (optional)Security flow (optional)

RAB establish flow

Call proceeding

NAS signaling before correlative bearer releaseCorrelative bearer release

RRC Connection Establishment


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RRC Connection EstablishmentFlow (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

UENode BServing RNS

ServingRNC

DCH - FP

Allocate RNTISelect L1 and L2parameters

RRCRRC

NBAPNBAP3. Radio Link Setup Response

NBAPNBAP2. Radio Link Setup Request

RRC RRC 7. CCCH : RRC Connection Set up

Start RXdescription

Start TXdescription

4. ALCAP Iub Data Transport Bearer Setup

RRCRRC 9. DCCH : RRC Connection Setup Complete

6. Uplink Synchronisation

NBAPNBAP 8. Radio Link Restore Indication

DCH - FP

DCH - FP

DCH - FP

f l


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Iu Interface SignalingConnection Establish

In Iu interface, radio network layer reports the RANAPinformation and NAS information. NAS information is takenas directed message in RANAP information.

And the process of Iu signaling connection is to establishthe 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

f Si li


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Iu Interface SignalingConnection Establish

In Iu interface, radio network layer reports the RANAPinformation and NAS information. NAS information is takenas directed message in RANAP information.

And the process of Iu signaling connection is to establish theIu 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

A h i i d S i


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Authentication and SecurityFlow

UE RNC CN

RRC Connection Setup Initial DT

Initial UE Message

DL DT (Authentication

Request)DL DT (AuthenticationRequest)DL DT (Authentication

Request) DL DT (AuthenticationRequest)

Common ID

Security Mode CommandSecurity Mode Command

Security Mode Command


RAB Assignment


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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 ACK

Disconnect

ReleaseRelease Complete

UE Outgoing Call

UE MSC

Paging Response

Authentication Request

Authentication Response



RAB Assignment

Setup

Call Confirmed

Alerting

Connect

Connect ACK

Disconnect

ReleaseRelease Complete

Paging

RRC and NAS signaling Connection Setup


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NAS Signaling (PS)UE MSC

CMServi ce Accept

Servi ce Request

RRC

Act i vate PDP Context Req

Act i vate PDP Context Accept

RAB

Deacti vate PDP Context Req

Deacti vate PDP Context Accept

UE Outgoing Call

UE MSC

Servi ce Request

RRC

Request PDP Context Acti vat i on

Act i vate PDP Context Req

RAB

UE Terminating Call

Pagi ng

Authenti cate and ci pheri ng ReqAuthenti cate and ci pheri ng Rsp Authenti cate and ci pheri ng Req

Authenti cate and ci pheri ng Rsp

Act i vate PDP Context Accept

Deacti vate PDP Context Req

Deacti vate PDP Context Accept

SGSN SGSN

RRC connection and NAS signalingconnection establishment RRC connection and NAS signaling

connection establishment

Security ModeSecurity Mode

Security ModeSecurity Mode

RAB establishmentRAB establishmentRAB establishmentRAB establishment


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UE to UE (1)Ori UE Ter UE NodeB1 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 Set up Cmp

10. I ni ti al DT

11. I ni t UE(CMSer vi ce Req)

12. DT( Authent i caReq)

15. DT( Authent i caRsp)

13. DL DT

14. UL DT

RANAP

RRCRRC

NBAP NBAP

NBAP NBAP

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

NBAP NBAP

70.RL RecfgReady

NBAP NBAP

69.RL RecfgPrep

Q. AAL2 Q. AAL2

72. AAL2Setup Rsp

Q. AAL2 Q.AAL2

71. AAL2Setup Req

FPFP 73. DL Sync

FPFP 74 . UL Sync

RRC RRC75. RB Setup

Q.AAL2 Q.AAL265. AAL2 Setup

ReqQ.AAL2 Q.AAL2

66. AAL2 SetupConf

FPFP 67. DL Sync

FPFP 68. UL Sync


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NBAP NBAP76.RL Rcfg

Commi t

RRC RRC77. RB Se t up Compl ete

RANAP RANAP78. RAB Ass

Rsp

RRC RRC79. UL DT

RANAP RANAP80. DT(Al er t i

ng)

RANAP RANAP81. DT(Al ert i ng)

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( Co nnec

t Ack )90. DL DT

Alerting

Connect


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RANAP RANAP92. DT( Di sconne

ct )

RRC RRC91.UL DT

RANAP RANAP96. DT

(Di sconnect)

RRC RRC97. DL DT

RRC RRC98. UL DT

RANAP RANAP99 . DT

(Rel ease)

RANAP RANAP93.DT(Rel ease)

RRC RRC94. DL DT

RRC RRC95. UL DT

RANAP RANAP102. DT

( Rel ease Ack)

RANAP RANAP100. DT

(Rel Comp)

RRC RRC101. DL DT

RANAP RANAP103. I U Rel

Cmd


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Concepts about Soft Handover

Soft handover: the signals from different NodeBs aremerged in RNC.

Softer handover: the signals from different cells, but

from the same NodeB are merged in NodeB.


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Node B

RNC

AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridge

Soft Handover Flow

Core NetworkCore Network


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Node B

RNC

AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridge

Merged in NodeB

Soft Handover FlowCore NetworkCore Network


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Merged in RNC

Node B

RNC

AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridge

Soft Handover Flow


Soft Handover Flow (SRNC-


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Soft Handover Flow (SRNC-DRNC)

Merged in SRNC

Node B

AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridge

Serving RNC

Drift RNC


Soft Handover Flow (SRNC


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Soft Handover Flow (SRNCRelocation)

Node B

AirBridgeAirBridge

AirBridgeAirBridge

AirBridgeAirBridge

Serving RNC

RNC


Soft Handover Flow Intra-


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Before Handover After Handover

SRNC

NodeBNodeB

SRNC

NodeBNodeB

SRNC

NodeBNodeB

During Handover

Soft Handover Flow Intra-RNC

CNCN CN

Soft Handover Flow Add


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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

NBAP2. Radio Link Setup Response

NBAP

3 ALCAP Iub Data Transport Bearer Setup

Start RX description

DCH-FP4. Downlink SynchronisationDCH-FP

DCH-FP5.Uplink SynchronisationDCH-FP


RRC

RRC

RRC

RRC

Soft Handover Flow AddBranch in RNC

Soft Handover Flow Add


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Decision to setupnew RL



UE Node B(new) SRNC

NBAP1. Radio Link Setup RequestNBAP

NBAP2. Radio Link Setup Response

NBAP

3 ALCAP Iub Data Transport Bearer Setup





RRC

RRC

RRC

RRC

Soft Handover Flow AddBranch in RNC

Soft Handover Flow Del


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Decision to deletea RL



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 DelBranch in RNC


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Before Handover Before Handover After Handover After Handover

Radio Link can not exist simultaneouslyRadio Link can not exist simultaneously

SRNC

NodeBNodeB

SRNC

NodeBNodeB

Hard Handover (Intra-RNC)

CNCN


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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 tohandover

Start Rx

Start Tx



NBAP

NBAP

NBAP

11. ALCAP Iub Data Transport Bearer Release



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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 tohandover

Start Rx

Start Tx



NBAP

NBAP

NBAP

11. ALCAP Iub Data Transport Bearer Release



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SRNC Relocation

SRNS

Core Network

Iu

DRNS Iur

UE

RNS

Core Network

Iu

SRNS

UE

After SRNS Relocation

Before SRNS Relocation

Cells


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Inter-System Handover Flow


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Inter-System Handover FlowUMTS->GSM

UE NodeB RNC 3G MSC 2G MSC BSS

Measurement Report (2D)RL Recf g Prep

RL Recf g Ready

Physi cal Channel Reconfi gurati on

RL Recf g Commi t

Physi cal Channel Reconfi gurati on cmp

Measurement Control ( I nterRAT)

Measurement Report (GSM)

Rel ocati on Requi red

Rel ocat i on Command

Prepare HandoverHandover Request

Handover Request ACK

Prepare Handover RSP

Handover FromUTRAN CMD

Handover Compl ete

I U rel ease command

I U rel ease compl ete

RRC Con Rel ease Req

RRC Con Rel ease Cmp

RL Del Req

RL Del Rsp

Inter-System Handover Flow


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Inter-System Handover Flow(GSM-UMTS)

UE NodeB RNC 3G MSC 2G MSC BSS

RL set up r equeset

RL set up response

RL Restore I ndi cat on

Handover Compl et e

UTRAN Capaci t y I nf o

UE Capaci t y I nf o Enqui r y

Rel ocati on RequesetPr epare Handover

Handover Request

Handover Command

Send end si gnalr equeset

I nt er Syst em t o UTRAN Ho cmd(Handover t o UTRAN Command)

Cl ear command

Cl ear compl ete

UTRAN Capaci t y I nf o Conf i r m

UE Capaci t y I nfo Conf i r m

Rel ocati on RequesetACK

Prepare Handover RSP

Rel ocati on Compl ete

Send end si gnalr esponse

UE Capaci t y I nf o

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 flowin UTRAN. This is very helpful for the CN signaling

flow.


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02-OWA210001 WCDMA UTRAN Interface and Signaling Procedure ISSUE 1.1

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Transcript of 02-OWA210001 WCDMA UTRAN Interface and Signaling Procedure ISSUE 1.1