90115741-utran-wcdma

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

WCDMA UTRAN

Interface and

Signaling

Procedure

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

Objectives

Upon completion of this course, you will be able to:

Understand UTRAN interface and structure

Understand the definitions about UTRAN network elements

Understand UTRAN signaling procedure


Contents

1. UTRAN Network Overview

2. Basic Concepts about UTRAN

3. UTRAN Signaling Procedure


Contents





The Position of UTRAN in WCDMA

Network


UMTS Construction

UTRAN UMTS Terrestrial Radio Access Network

CN Core Network

UE User Equipment

Iu

UTRAN

UE

Uu

CN


UMTS Structure

RNS

RNC

RNS

RNC

Core Network

Node B Node B Node B Node B

Iu Iu

Iur

Iub Iub Iub Iub

Uu Interface

L3

co

ntr

ol

co

ntr

ol

co

ntr

ol

Logical

Channels

Transport

Channels

C-plane signalling U-plane information

PHY

L2/MAC

L1

RLC

DC Nt GC

L2/RLC

MAC

RLC RLC

RLC

RLC

RLC RLC

RLC

Duplication avoidance

UuS boundary

BMC L2/BMC

control

PDCP PDCP L2/PDCP

DC Nt GC

Radio

Bearers

RRC

co

ntr

ol

General Protocol Mode for UTRAN

Terrestrial Interface The structure is based on the principle that the layers and

planes are logically independent of each other.

ApplicationProtocol

DataStream(s)

ALCAP(s)

TransportNetwork

Layer

Physical Layer

Signalling

Bearer(s)

TransportUser

NetworkPlane

Control Plane User Plane

TransportUser

NetworkPlane

Transport NetworkControl Plane

RadioNetwork

Layer

Signalling

Bearer(s)

Data

Bearer(s)


RNL Control Plane Application

Protocol

NBAP ：Node B Application Part

RANAP：Radio Access Network Application Part

RNSAP：Radio Network Subsystem Application Part

RRC ：Radio Resource Control

Node B

RNC

CN

UE

RANAP

NBAP

RNSAP RRC RNC


Iu-CS Interface

Q.2150.1

Q.2630.1

RANAP Iu UP Protocol

Layer

Transport

Network

Layer

Transport Network

User Plane


Transport Network

User Plane Transport Network

Control Plane

Radio

Network

Layer

SSCOP

AAL5

SSCOP

SSCF-NNI

AAL2 AAL5

MTP3b MTP3b

SCCP

SSCF-NNI

Physical Layer

ATM


Iu-PS Interface

SSCF-NNI

SSCOP

AAL5

IP

SCTP

SCCP

SSCF-NNI

MTP3-B

M3UA

Physical Layer


ATM

AAL5

IP

UDP

GTP-U

Physical Layer

ATM

Transport

Network

Layer

Transport Network

Control Plane

Radio

Network

Layer

RANAP Iu UP Protocol

Layer

Transport Network

User Plane

Transport Network

User Plane


Iub Interface

Node B

Application Part

(NBAP)

AAL Type 2

ALCAP

Transport

Layer

Radio

Network

Layer

Radio Network

Control Plane

Transport

Network

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

Physical Layer


Iur Interface

SSCF-NNI

SSCOP

MTP3-B

AAL5

IP

SCTP

SCCP

AAL5

STC (Q.2150.1)

RNSAP Iur Data

Stream(s)

Physical Layer


ATM

ALCAP(Q.2630.1)

AAL2

SSCF-NNI

SSCOP

MTP3-B

IP

SCTP

M3UA M3UA

Transport

Network

Layer

Transport Network

Control Plane

Radio

Network

Layer

Transport Network

User Plane

Transport Network

User Plane


Contents





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

Iu 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

Iub

Node B

Cell Cell Cell

Node B

...

Iu

CRNC

CN


RAB, RB and RL

RAB

RB

RL NodeB

RNC CN UE

UTRAN


UE Working Modes and States

Idle mode

Connected mode

Cell_DCH

Cell_FACH

Cell_PCH

URA_PCH


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

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)


Connected Mode

Cell-DCH

In active state

Communicating via its dedicated channels

UTRAN knows which cell UE is in.


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.



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


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


UE States

CELL_DCH CELL_FACH

CELL_PCH URA_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


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)


Contents





Contents


3.1 Cell Setup

3.2 System Information Broadcast

3.3 Paging

3.4 Call Process

3.5 Handover

Cell Setup

NBAP

NBAP

NBAP

NBAP

NBAP

NBAP

NBAP

NBAP

NBAP

NBAP

NCP: Resource Status Ind

NCP: Audit Req

NCP: Cell Setup Req

NCP: Cell Setup Rsp

NBAP NBAP NCP: Comm TrCh Setup Req

NBAP NBAP NCP: Comm TrCh Setup Rsp

Q.AAL2

Q.AAL2

Q.AAL2

Q.AAL2

Est Req

Est Conf

RNC NodeB

NCP: Audit Rsp

NBAP NBAP NCP: Comm TrCh Setup Req

NBAP NBAP NCP: Comm TrCh Setup Rsp

Q.AAL2

Q.AAL2

Q.AAL2

Q.AAL2

Est Req

Est Conf


Contents


3.1 Cell Setup


3.3 Paging

3.4 Call Process

3.5 Handover


System Information Broadcast

Flow

3.BCCH:System Information

1.System Information Update Request

UE Node B RNC CN

NBAP NBAP

RRC RRC

4.BCCH:System Information RRC RRC

5.BCCH:System Information RRC RRC

2.System Information Update Response

NBAP NBAP


Introduction of System Information

MIB： Contains PLMN tag and SB (scheduling information block) or the scheduling information for SIB (system info block)

SB1： Contains scheduling information for SIB

SB2： Contains scheduling information for SIB

SIB1： Contains the system information for NAS and the timer/counter for UE

SIB2： Contains the URA information

SIB3： Contains the parameters for cell selection and cell re-selection



SIB4： Contains parameters for cell selection and cell re-selection while UE is in connecting mode

SIB5： Contains parameters for the common physical channels of the cell

SIB6： Contains parameters for the common physical channels of the cell while UE is in connecting mode

SIB7： Contains the uplink interference level and the refreshing timer for SIB7

SIB8：

Contains the CPCH static information



SIB9：

Contains the CPCH dynamic information

SIB10：

Contains information to be used by UEs having their DCH controlled by a

DRAC procedure

Used in FDD mode only

To be used in CELL_DCH state only

Changes so often, its decoding is controlled by a timer

SIB11：

Contains measurement controlling information

SIB12：

Contains measurement controlling information in connecting mode

SIB13：

Contains 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 from other RAT to UTRAN

SIB17: Contains the configuration information for TDD

SIB18: Contains the PLMN identities of the neighboring cells To 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 DRX：K ＝ 6，then

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

TTI = 640 ms

PS domain DRX：K ＝ 6，then

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

TTI = 640 ms

The different timers for UE in

connecting mode and idle mode.



System info type 2

URA information



The references for cell

selection and re-selection

Qhyst2s

Sintrasearch

Sintersearch

SinterRatsearch

Qqualmin

Qrxlemin

T reselection

Max Allowed UE TX power



The configuration

information for the following

physical channels and the

counterpart transport

channels

PICH

AICH

PCCPCH

PRACH

SCCPCH



and 11 System info type 7

Including the UL interference level which is used for open loop

power control:

Preamble_Initial_Power=Primary CPICH DL TX power -

CPICH_RSCP + UL interference + Constant Value

Including the Expiration Time Factor which is used for

refreshing the SIB7 periodically

System info type 11

The neighbor cell information for cell re-selection in IDLE mode.


Contents


3.1 Cell Setup


3.3 Paging

3.4 Call Process

3.5 Handover


Paging Caused by CN

PS Paging Without RRC Connection for CS

SGSNUENodeB

1RNC1

RANAP

NodeB

2RNC2

RANAP

MSC/VLR

RANAP

RANAPPaging

Paging

RRC

RRCPaging Type 1RRC

Paging Type 1

UE RNC1

RANAP

MSC/VLR

RANAP Paging

SGSN

PS Paging With RRC Connection for CS

RRC Connection Establish

NodeB

1

RRCPaging Type 2RRC


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_DCH，UTRAN send

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

UE RNC1NodeB1

RRCPaging Type 1RRC


Contents


3.1 Cell Setup


3.3 Paging

3.4 Call Process

3.5 Handover


Introduction of Call Process

In WCDMA system, a call process includes the following basic

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 release

Correlative bearer release

RRC Connection Establishment Flow

(DCH)

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

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

UTRAN.

1. CCCH : RRC Connection Request

5. Downlink Synchronisation

UE Node B

Serving RNS Serving

RNC

DCH - FP

Allocate RNTI Select L1 and L2 parameters

RRC RRC

NBAP NBAP

3. Radio Link Setup Response

NBAP NBAP

2. Radio Link Setup Request

RRC RRC

7. CCCH : RRC Connection Set up

Start RX description

Start TX description

4. ALCAP Iub Data Transport Bearer Setup

RRC RRC

9. DCCH : RRC Connection Setup Complete

6. Uplink Synchronisation

NBAP NBAP

8. Radio Link Restore Indication

DCH - FP

DCH - FP

DCH - FP


Iu Interface Signaling Connection

Establish

In Iu interface, radio network layer reports the

RANAP information and NAS information. NAS

information is taken as directed message in RANAP

information.

And the process of Iu signaling connection is to

establish the Iu interface connection of SCCP

between RNC and CN.

UE Node B RNC CN

RRC RRC

SCCP SCCP

SCCP SCCP

Initial DT

Initial UE message (Connect

Request)

Connect Confirm

RANAP

Transport Network

User Plane

Control Plane

SSCOP

AAL5

MTP3b

SCCP

SSCF-NNI


Authentication and Security Flow UE RNC CN

RRC Connection Setup

Initial DT Initial UE Message

DL DT (Authentication

Request) DL DT (Authentication



Request)

Common ID

Security Mode Command Security Mode Command

Security Mode Command Security Mode Command

RAB Assignment


Common ID


RAB Establishment Flow NodeB UE CN RNC

RANAP RANAP RAB Ass Req

Q.AAL2 Q.AAL2

Q.AAL2 Q.AAL2

NBAP NBAP

AAL2 Setup Req

RL Recfg Prep

AAL2 Setup Rep

NBAP NBAP RL Recfg Ready

Q.AAL2 Q.AAL2 AAL2 Setup Req

Q.AAL2 Q.AAL2 AAL2 Setup Rep

FP FP DL Sync

FP FP UL Sync

RRC RRC RB Setup

NBAP NBAP RL Recfg Commit

RRC RRC RB Setup Complete

RANAP RANAP RAB Ass Rep


NAS Signaling (CS)

UE Terminating Call

UE MSC

CM Service Request

RRC and NAS signaling Connection Setup

Authentication Request

Authentication Response

Security Mode Command


RAB Assignment

Setup

Call Proceeding

Alerting

Connect

Connect ACK

Disconnect

Release

Release Complete

UE Outgoing Call

UE MSC

Paging Response

Authentication Request

Authentication Response



RAB Assignment

Setup

Call Confirmed

Alerting

Connect

Connect ACK

Disconnect

Release

Release Complete

Paging

RRC and NAS signaling Connection Setup


NAS Signaling (PS) UE MSC

CM Service Accept

Service Request

RRC连接建立

Activate PDP Context Req

Activate PDP Context Accept

RAB建立

安全模式

Deactivate PDP Context Req

Deactivate PDP Context Accept

UE Outgoing Call

UE MSC

Service Request

RRC连接建立

Request PDP Context Activation

Activate PDP Context Req

RAB建立

安全模式

UE Terminating Call

Paging

Authenticate and ciphering Req

Authenticate and ciphering Rsp鉴权 Authenticate and ciphering Req

Authenticate and ciphering Rsp鉴权

Activate PDP Context Accept

Deactivate PDP Context Req

Deactivate PDP Context Accept

SGSN SGSN

RRC connection and NAS signaling

connection establishment RRC connection and NAS signaling

connection establishment

Security Mode

Security Mode

RAB establishment

RAB establishment


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

1.RRC Connect Setup Req

2.RL Setup Req

3.RL Setup Rsp

4.AAL2 Setup Req

5.AAL2 Setup Rsp

6.DL Sync

7.UL Sync

8.RRC Connect Setup

9.RRC Connect Setup Cmp

10.Initial DT

11.Init UE(CM

Service 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 ID

17.Sec Mod Cmd

20.Sec Mod Cmp

21.UL DT

18.Sec Mod Cmd

19.Sec Mod Cmp

24.DL DT

23.DT(Call Procceding)

25.RAB Ass Req

32.RL Recfg Prep

35.RL Recfg Ready

27.AAL2 Setup Req

29.AAL2 Setup Rsp

IU AAL2 may be

established later

注1：协议规定如果发

起安全模式，CN不回

应CM Service Req

早指配：在CC层通信建立后马上进行业务指派

晚指配：在收到Alerting后才进行业务指派

RANAP

RANAP RANAP

RRC RRC

RRC RRC

RANAP RANAP

RRC RRC

RANAP RANAP

RANAP RANAP

RRCRRC

RANAP RANAP

RANAP RANAP

RRC RRC

Q.AAL2 Q.AAL2

Q.AAL2 Q.AAL2

RRC 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 cmd

57.Sec mod cmd

58.Sec mod cmp

54.UL DT(Authent Rsp)

47.DT(Authent Req)

49.DL DT

50.UL DT

55.Common ID

60.DT(Setup)

59.Sec mod cmp

61.DL DT

63.Call Confirm

62.UL DT

37.AAL2 Setup Req39.AAL2 Setup Rsp

43.DL Sync

44.UL Sync

51.RL Recfg Commit

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

RRC

RANAP

RRC RRC

RRC

Q.AAL2Q.AAL2

RRC

RANAP

RANAP RANAP

RANAP

RRCRRC

RRC

RRC RRC

RRC

RRC

RANAP

RRC RRC

RANAP

RANAP RANAP

RANAP

RANAP

RANAP

RRCRRC

RRC RRC

FP

FP

FP

FP

RANAP



RANAP RANAP64.RAB Ass Req

NBAPNBAP

70.RL Recfg Ready

NBAPNBAP

69.RL Recfg Prep

Q.AAL2 Q.AAL2

72.AAL2 Setup Rsp

Q.AAL2 Q.AAL2

71.AAL2 Setup Req

FPFP 73.DL Sync

FPFP 74.UL Sync

RRC RRC75.RB Setup

Q.AAL2 Q.AAL265.AAL2 Setup

Req

Q.AAL2 Q.AAL266.AAL2 Setup

ConfFPFP 67.DL Sync

FPFP 68.UL Sync



NBAPNBAP76.RL Rcfg

Commit

RRC RRC77.RB Setup Complete

RANAP RANAP78.RAB Ass

Rsp

RRC RRC79.UL DT

RANAP RANAP80.DT(Alerti

ng)

RANAP RANAP81.DT(Alertin

g)

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(Connect Ack)

90.DL DT

Alerting消息由被叫送

出

Connect消息由被叫摘

机后发出



RANAP RANAP92.DT(Disconne

ct)

RRC RRC91.UL DT

RANAP RANAP

96.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 Req

Q.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 Cmp

NBAP 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 RRC

116.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


Cmp


Cmp


Activate PDP Context from UE UE NodeB RNC SGSN


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


10.Initial DT

11.Init UE(CM Service Req)

12.DT(Authentica and ciphering

Req)

15.DT(Authentica and ciphering

Rsp)

16.Common ID

17.Sec Mod Cmd

13.DL DT

14.UL DT

RRC RRC

RRCRRC

RRC RRC

RRC RRC

RRC RRC

RRCRRC

NBAPNBAP

NBAPNBAP

Q.AAL2

Q.AAL2Q.AAL2

Q.AAL2

FP

FP

FP

FP

RANAP

RANAP

RANAP

RANAP

RANAP

RANAP

RANAP RANAP

RANAP

RANAP

Activate PDP Context from UE UE NodeB RNC SGSN

22.DT(ACTIVATE PDP CONTEXT REQUEST)

20.Sec Mod Cmp

21.UL DT

18.Sec Mod Cmd

19.Sec Mod Cmp

23.RAB Ass Req

26.RL Recfg Prep27.RL Recfg

Ready28.AAL2 Setup Req

29.AAL2 Setup Rsp

30.DL Sync

31.UL Sync

33.RL Recfg Commit

32.RB Setup

34.RB Setup Complete

24.AAL2 Setup Req

25.AAL2 Setup Rsp

35.RAB Ass Rsp

36.DT(ACTIVATE PDP CONTEXT ACCEPT)

37.DL DT

RRCRRC

RRC RRC

RRC RRC

RRC RRC

RRC RRC

RRC RRC

RANAP RANAP

RANAP RANAP

RANAP RANAP

RANAP RANAP

RANAP RANAP

RANAP

RANAP

RANAP

RANAP

NBAP NBAP

NBAPNBAP

Q.AAL2Q.AAL2

Q.AAL2Q.AAL2

FPFP

FPFP

NBAPNBAP

Activate PDP Context from Network UE NodeB RNC SGSN


4.RL Setup Req

5.RL Setup Rsp6.AAL2 Setup

Req7.AAL2 Setup

Rsp8.DL Sync

9.UL Sync

10.RRC Connect Setup


12.Initial DT

13.Init UE(CM Service Req)14.DT(Authentica and ciphering

Req)

17.DT(Authentica and ciphering Rsp)

18.Common ID

19.Sec Mod Cmd

22.Sec Mod Cmp

15.DL DT

20.Sec Mod Cmd

21.Sec Mod Cmp

16.UL DT

1.Paging

2.Paging type 1 RRCRRC

RRCRRC

RRCRRC

RRCRRC

RRCRRC

RRC

RRC

RRC

RRC

RRC

RRC

RRC

RRC

NBAPNBAP

NBAPNBAP

Q.AAL2Q.AAL2

Q.AAL2Q.AAL2

FP

FP

FP

FP

RANAP

RANAP

RANAP

RANAP

RANAP RANAP

RANAP RANAP

RANAP RANAP

RANAP RANAP

RANAP RANAP

Activate PDP Context from Network

UE NodeB RNC SGSN

26.DT(ACTIVATE PDP CONTEXT REQUEST)

25.UL DT

27.RAB Ass Req

30.RL Recfg Prep

31.RL Recfg Ready

32.AAL2 Setup Req

33.AAL2 Setup Rsp

34.DL Sync

35.UL Sync

37.RL Recfg Commit

36.RB Setup

38.RB Setup Complete

28.AAL2 Setup Req

29.AAL2 Setup Rsp

39.RAB Ass Rsp

40.DT(ACTIVATE PDP CONTEXT ACCEPT)

41.DL DT

24.DL DT

23.DT(REQUEST PDP CONTEXT ACTIVATION)

RRC RRC

RRC RRC

RRCRRC

RRCRRC

RRCRRC

NBAP NBAP

NBAPNBAP

NBAPNBAP

Q.AAL2 Q.AAL2

Q.AAL2Q.AAL2

FPFP

FPFP

RANAP RANAP

RANAP

RANAP

RANAP

RANAP

RANAP

RANAP

RANAP

RANAP

RANAP RANAP

RANAP RANAP


Contents


3.1 Cell Setup


3.3 Paging

3.4 Call Process

3.5 Handover


Concepts about Soft Handover

Soft handover: the signals from different NodeBs are merged in

RNC.

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

same NodeB are merged in NodeB.


Node B

RNC

AirBridge

AirBridge

AirBridge

Soft Handover Flow

Core Network


Node B

RNC

AirBridge

AirBridge

AirBridge

Merged in NodeB

Soft Handover Flow

Core Network


Merged in RNC

Node B

RNC

AirBridge

AirBridge

AirBridge

Soft Handover Flow

Core Network


Soft Handover Flow (SRNC-DRNC)

Merged in SRNC

Node B

AirBridge

AirBridge

AirBridge

Serving RNC

Drift RNC

Core Network


Soft Handover Flow (SRNC

Relocation)

Node B

AirBridge

AirBridge

AirBridge

Serving RNC

RNC

Core Network


Before Handover After Handover

SRNC

NodeB NodeB

SRNC

NodeB NodeB

SRNC

NodeB NodeB

During Handover

Soft Handover Flow（Intra-RNC）

CN CN CN


Decision to setup

new RL

7. DCCH : Active Set Update Complete

6.DCCH: Active Set Update

UE Node B(new) SRNC

NBAP 1. Radio Link Setup Request NBAP

NBAP 2. Radio Link Setup Response NBAP

3 ALCAP Iub Data Transport Bearer Setup


DCH-FP 4. Downlink Synchronisation DCH-FP

DCH-FP 5.Uplink Synchronisation DCH-FP


RRC

RRC

RRC

RRC

Soft Handover Flow （Add Branch

in RNC）


Decision to delete

a RL

2. DCCH : Active Set Update Complete

1.DCCH: Active Set Update

UE Node B(old) SRNC

NBAP 3. Radio Link Deletion Request NBAP

NBAP 4. Radio Link Deletion Response NBAP

RRC

RRC

RRC

RRC

Stop RX and Tx

5 ALCAP Iub Transport Bearer release

Soft Handover Flow （Del Branch

in RNC）


Before Handover After Handover

Radio Link can not exist simultaneously

SRNC

NodeB NodeB

SRNC

NodeB NodeB

Hard Handover (Intra-RNC)

CN CN


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 Indication RRC RRC

NBAP NBAP

NBAP

RRC RRC

NBAP

NBAP

NBAP NBAP

Decide to

handover

Start Rx

Start Tx

DCH-FP 4. Downlink Synchronisation DCH-FP

DCH-FP 5.Uplink Synchronisation DCH-FP

NBAP

NBAP

NBAP

11. ALCAP Iub Data Transport Bearer Release

Hard Handover (Intra-RNC)


SRNC Relocation

SRNS

Core Network

Iu

DRNS Iur

UE

RNS

Core Network

Iu

SRNS

UE

After SRNS Relocation

Before SRNS Relocation

Cells


Hard Handover with Relocation

(CS) SourceRNC TargetRNCCN

Relocation Reqired

Reloc Req

RANAP RANAP

RANAP RANAP

RANAP RANAPReloc Req Ack

RANAP RANAPRelocation Cmd

RANAP

RANAPIU Rel Complete

RNSAP RNSAPReloc Detect

UE

RRC Physical Channel Recfg Req

NodeB

RNSAP RNSAPRL Restore Ind

RRC

RRCRRC Physical Channel Recfg Complete

NodeB

RANAP RANAPRL Del Req

RANAP RANAPRL Del Rsp

RANAP

RANAP IU Rel Cmd

RL Setup ReqNBAP NBAP

NBAP NBAPRL Setup Rsp

Est Req

Est Conf

DL Sync

UL Sync

Q.AAL2

Q.AAL2

Q.AAL2

Q.AAL2

DCH-FP

DCH-FP

DCH-FP

DCH-FP


Inter-System Handover Flow

（UMTS->GSM） UE NodeB RNC 3G MSC 2G MSC BSS

Measurement Report(2D)

RL Recfg Prep

RL Recfg Ready

Physical Channel Reconfiguration

RL Recfg Commit

Physical Channel Reconfiguration cmp

Measurement Control(InterRAT)

Measurement Report(GSM)

Relocation Required

Relocation Command

Prepare Handover

Handover Request

Handover Request ACK

Prepare Handover RSP

Handover From UTRAN CMD

Handover Complete

IU release command

IU release complete

RRC Con Release Req

RRC Con Release Cmp

RL Del Req

RL Del Rsp


Inter-System Handover Flow

(GSM-UMTS) UE NodeB RNC 3G MSC 2G MSC BSS

RL setup requeset

RL setup response

RL Restore Indicaton

Handover Complete

UTRAN Capacity Info

UE Capacity Info Enquiry

Relocation RequesetPrepare Handover

Handover Request

Handover Command

Send end signal requeset

Inter System to UTRAN Ho cmd (Handover to UTRAN Command)

Clear command

Clear complete

UTRAN Capacity Info Confirm

UE Capacity Info Confirm

Relocation Requeset ACK

Prepare Handover RSP

Relocation Complete

Send end signal responseUE Capacity Info


Forward Handover

Forward Handover is sponsored by UE, including cell

update 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.


Summary

This chapter mainly explains the basic signaling flow in

UTRAN. This is very helpful for the CN signaling flow.

Thank you www.huawei.com

Date post:	28-Apr-2015
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