wcdma 20utran 20signaling 20procedure 20100208 b v1 2e0

8/12/2019 WCDMA 20UTRAN 20Signaling 20Procedure 20100208 B V1 2E0

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Internal

WCDMA UTRAN Signaling

Procedure

Wireless Case and Training Department


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After this course, you will be able to:

Understand the definitions about UTRAN

network elements

Understand UTRAN signaling procedure


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Chapter 1 Basic Concepts about UTRAN

Chapter 2 UTRAN Signaling Procedure


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RNL Control Plane Application Protocol

Node B

RNC

CN

UE

RANAP

NBAP

RNSAPRRC

NBAPNode B Application Part

RANAPRadio Access Network Application Part

RNSAPRadio Network Subsystem Application Part

RRC Radio Resource Control

RNC


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RAB, RB and RL

UTRAN, RABRBRL

RABQos

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, asignaling connection has to be established.

UE camps on a cell

It enables the UE to receive system information from the PLMN

UE can monitor PICH of a cell for paging

The idle mode tasks can be divided into three processes:

PLMN selection and reselection

Cell selection and reselection

Location registration


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Connected Mode

When UE is in connected mode

The UE position can be known on different levels:

Cell level (CELL_DCH/CELL_FACH/CELL_PCH)

UTRAN Registration Area (URA) level (URA_PCH)

The UE can use different types of channels in connected mode

Dedicated transport channels (CELL_DCH)

Common transport channels (CELL_FACH)


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Connected Mode

Cell-DCH

In active state

Communicating via its dedicated channels

UTRAN knows which cell UE stays in


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Connected Mode

Cell-PCH

No data to be transmitted or received

Monitor PICH, to receive its paging

UTRAN knows which cell the UE stays in

UTRAN has to update cell information of UE when UE

roams to another cell

Lower the power consumption of UE


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Connected Mode

URA-PCH

No data to be transmitted or received

Monitor PICH, to receive its paging

UTRAN only knows which URA (which consists of multiple cells) that

UE stays

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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UE Working Modes and States

CELL_DCH CELL_FACH

CELL_PCHURA_PCH

IDLE

DEAD - Scan networks (PLMN)- Camp on a cell

- Monitor paging channel- Cell re-selection

- Dedicated channel-Common service,such as voice

-Reduce activity, DTX,and save powerRRC Conn ect ion

- Common channel-PS service with few

data to transmit

-Reduce activity further-Avoid unnecessarysignaling


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SRNC / DRNC

SRNC and DRNC are concepts for a connected UE.

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


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CRNC

The CRNC owns the radio resources of a cell

Dynamical control of power for dedicated channels, within limits admitted byCRNC, 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


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Chapter 1 Basic Concepts about UTRAN



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Section1 Call Overall Procedures

Section2 Cell Setup

Section3 System information broadcasting

Section3 UE Registration

Section4 Paging

Section5 Call Process

Section6 Handover


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Call Overall Procedures

Network side Start

1Initialize equipment2Process system

broadcast

Step 1

Handset Power on

1cell reselection2Location registration

3Waiting for call

Step 2

Paging UE

Step 3

RRC connection

Establish

Step 4

NAS signaling

connection establish

Step 5

RAB set up

1synchronous set up2asynchronous set up

Step 6

RAB/RB

modification

Step 6

Transport channel

reconfiguration

Step 6

Physical channel

reconfiguration

Step 6

Soft/hard

handover

Step 6

URA update

Step 6

Cell update

Step 6

Handover with GSM

Step 7

RRC connection

release

Step 8

Waiting for call again

1cell selection2wait for call


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Section2 Cell Setup



Section5 Paging


Section7 Handover


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Cell Setup Flow


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Cell Setup Signaling Analysis

Cell setup

The following parameters will be take to NODEB

After receiving the AUDIT RESPONSE

message from the NodeB RNC sends

a CELL SETUP REQUEST message to

the NodeBWhether the conditions of

cell setup are fulfilled depends on the

following local cell information

reported by the NodeB:

Downlink power range

Minimum spreading factor

HSDPA cell capability of the NodeB

High Speed Downlink Shared

Channel (HS-DSCH) resource

information, which is used to set up

an HSDPA cell

Common transport channel and

physical channel information

CCP and NCP information


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Common transport channel setup (1) The common transport channel setup

procedure is performed to establish thenecessary resources in the NodeB,

regarding the following channels:,

PRACH, AICH, and RACH


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Common transport channel setup (2) The common transport channel setup

procedure is performed to establish the

necessary resources in the NodeB,regarding the following channels: S-

CCPCH, PICH, FACH, PCH.


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System information update

The system information update

procedure is performed for the NodeB

to schedule and update the system

information segments, which are

broadcast on the Broadcast Channel

(BCH), according to the parameters inthe SYSTEM INFORMATION UPDATE

REQUEST message.

If the system information is updated,

the NodeB sends a SYSTEM

INFORMATION UPDATE RESPONSE

message.


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Physical shared channel reconfiguration

The physical shared channel

reconfiguration procedure is performed for

the NodeB to reconfigure the physical

channels according to the PHYSICAL

SHARED CHANNEL RECONFIGURATION

REQUEST message sent from the CRNC.


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Section2 Cell Setup



Section5 Paging


Section7 Handover


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.

3.BCCH:System Information

1.System Information Update Request

UE Node B RNC CN

NBAPNBAP

RRCRRC

.

4.BCCH:System InformationRRCRRC

5.BCCH:System Information RRCRRC

.

2.System Information Update Response

NBAPNBAP

System Information Broadcasting Flow


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Introduction of System Information

MIB:

PLMN tag

Scheduling information for SB (Scheduling Block)

Scheduling information for SIB (System Information Block)

SB1: scheduling information for SIB

SB2: scheduling information for SIB (extended)


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SIB1: System information for NAS and the timer/counter for UE

SIB2: URA information

SIB3: Parameters for cell selection and cell re-selection

SIB4: Parameters for cell selection and cell re-selection while UE is in connected

mode

SIB5: Parameters for the common physical channels of the cell

SIB6: Parameters for the common physical channels of the cell while UE is in

connected mode


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SIB7: uplink interference level and the refreshing timer

SIB8: the CPCH static information

SIB9: the CPCH dynamic information

SIB10: information to be used by UEs having their DCH controlled by a DRAC

procedure

SIB11: measurement controlling information

SIB12: measurement controlling information in connected mode


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SIB13: ANSI-41 system information

SIB14: the information in TDD mode

SIB15: the position service information

SIB16: the needed pre-configuration information for handover from other RAT to

UTRAN

SIB17: the configuration information for TDD

SIB18: the PLMN identities of the neighboring cells to be used in shared networks

to help with the cell reselection process


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System Information Analysis (1)

MIBconsist of PLMNID and SB (scheduleblock)/SIB (system info block)

MIB ValueTag:

PLMN Identity : PLMN ID

SEG_COUNT

SIB_REP

SIB_POS

SIB_OFF

The MIB Scheduling information is fixed

SIB-POS = 0SIB-COUNT = 1SIB-REP =

8


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Scheduling information


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System info type 1

The NAS system information

CS domain DRX: K=6, then DRX

period is 2^k= 2^6= 64TTI=640 ms

PS domain DRX: K=6, then DRX

period is 2^k=2^6=64TTI =640 ms

Timers and counter for UEin

connection mode and timers for

UE in idle mode


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System info type 2

URA information


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System info type 3include cell selectand reselect parameters

CellIdentity

CellSelectReselectInfo information

CellAccessRestriction infromation


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System Information Block Type 7 and 11

System info type 7

Including the UL interference level which is used for open loop power

control

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


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Section2 Cell Setup


Section4 UE Registration Flow

Section5 Paging


Section7 Handover


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The Overall Of UE Registration Flow

UE Registration Flow

Step 1

UE Power on

1.Camp on cell

2.Read System information

Step 2

RRC connection setup

Step 3

NAS signaling setup

Step 4

IU interface transport setup

Step

UE become to Idle

Step5

RRC connection release


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When the SRNC receives an RRC CONNECTION REQUEST message from the UE, the Radio

Resource Management (RRM) module of the RNC determines whether to accept or reject the

RRC connection request, based on a specific algorithm. If accepting the request, the RRM module

further determines whether to set up the RRC connection on a Dedicated Channel (DCH) or on a

Common Channel (CCH), based on a specific RRM algorithm. Typically, an RRC connection is set

up on the DCH.

UE

SRNC

RRC: RRC CONNECTION REQUEST

RRC: RRC CONNECTION SETUP

RRC: RRC CONNECTION SETUP

COMPLETE

NodeB

RL SETUP REQUEST

RL SETUP RESPONSE

ALCAP Establish

RRC CONNECTION SETUP (DCH)


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RRC CONNECTION SETUP

This message take the RNTI

Identity to the UE

This message also take the

RRC State indicator of the

UE (CELL FACH)


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RRC CONNECTION SETUP COMPLETE

UE report the Capability

information to RNC which

consists of security capability

physical layer and L2 capability

and so on;

ue RadioAccessCapability


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UE SRNC CN

RRC INITIAL DIRECT TRANSFER

RANAP: INITIAL UE MESSAGE

RRC DT

RANAP DT

RANAP DT

RRC DT

The DT message between the UE and CNsuch s encryptionnd identity confirmconnection setuploc tion upd te etc

NAS Signaling Connection Setup


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INITIAL UE MESSAGE

CNdomain

information

MM messagehere

are location

updating request

UE imsi number

PLMN IDand

RNC ID report

to CN;


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DIRECT TRANSFER

The message contains the

Non Access Stratum (NAS)

information to be sent to the

CN by the UE


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After UE registrationll of the resource will be rele seinclude RLresourceIubinterf ce tr nsport be rer

resource

RRC Release Flow


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IU RELEASE COMMAND


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Section1 Call Overall Procedure

Section2 Cell Setup



Section5 Paging


Section7 Handover


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Paging Initiation

CN initiated paging Establish a signaling connection

UTRAN initiated paging

Trigger the cell update procedure

Trigger reading of updated system information

Paging type

If UE is in CELL_FACH or CELL_DCH mode

UTRAN initiated paging type is paging typ2;

If UE is in CELL_PCH,URA_PCH or idle mode,

UTRAN initiated paging type is paging typ1;


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The Flow of CN Initiated Paging

PS Paging Without RRC Connection for CS

SGSNUE NodeB1 RNC 1

RANAP

NodeB2 RNC 2

RANAP

MSC /VLR

RANAP

RANAPPaging

Paging

RRC

RRCPaging Type 1RRC

Paging Type 1

UE RNC 1

RANAP

MSC / VLR

RANAPPaging

SGSN

PS Paging With RRC Connection for CS

RRC Connection Establish

NodeB1

RRCPaging Type 2RRC


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CN Initiated PagingMessage Analysis

Paging UE IMSI

paging Cause


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Paging Type2 Message Analysis

UE in CELL_DCHor

CELL_FACHThe

paging information

bearer on DCCH

DCCHfor paging

Paging Causeand

information of the cn

domain


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UTRAN Paging

PCCHfor paging


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Section2 Cell Setup



Section5 Paging


Section7 Handover


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Call Process Flow Analysis

Call ProcessFlow Analysis as following annex


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Section2 Cell Setup



Section5 Paging




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Concepts about Soft Handover

Soft handover: the signals from different NodeBs are mergedin RNC

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

same NodeB are merged in NodeB


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Soft Handover Flow (Intra-RNC)

Before Handover After Handover

SRNC

NodeBNodeB

SRNC

NodeBNodeB

SRNC

NodeBNodeB

During Handover

CNCN CN


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Soft Handover Flow

RNC (SRNC)

AirBridge

AirBridge

AirBridge

Core Network

Node B


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Soft Handover Flow

RNC (SRNC)

AirBridge

AirBridge

AirBridge

Merged in NodeB

Core Network

Node B


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Soft Handover Flow

Merged in RNC

RNC (SRNC)

AirBridge

AirBridge

AirBridge

Core Network

Node B


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Soft Handover Flow (SRNC-DRNC)

Merged in SRNC

Node B

AirBridge

AirBridge

AirBridge

Serving RNC

Drift RNC

Core Network


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Soft Handover Flow (SRNC Relocation)

Node B

AirBridge

AirBridge

AirBridge

Serving RNC

RNC

Core Network


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Typical Soft Handover Flow (L3 Signaling)

Soft handover is triggered by 1A/1B/1C or 1D event

Measurement Report (1A/1B/1C or 1D)

Measurement Control

RRC Connection Setup Procedure

RNCUE

Active Set Update

Active Set Update Complete

Measurement Control


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Soft Handover Flow (Del Branch from AS)

Measurement Report

RNCUE

Active Set Update

Active Set Update Complete

NodeB (old)

RL Deletion Req.

Decision to

delete a RL

RL Deletion Rsp.


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Hard Handover

Before Handover After Handover

Radio Link can not exist simultaneously

SRNC

NodeBNodeB

SRNC

NodeBNodeB

CNCN


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Intra-Frequency Hard Handover

Intra-Frequency hard handover is triggered by 1D event

Measurement Control (Intra-freq)


RNCUE

Measurement Control (Intra-Freq)

Physical Channel Reconfiguration

Physical Channel Reconfiguration Complete

Decision to

setup new RL

Measurement Report (1D)

I t f H d


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Inter-frequency Handover

Measurement Report(2D)



RNCUE

Measurement Control (Inter-Freq)

Decision to enter

compress mode



Measurement Report

Decision to

setup new RL

Measurement Control (2D & 2F)





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Inter-RAT Handover Flow (UMTS->GSM)

Measurement Report(2D)



RNCUE

Measurement Control (Inter-RAT)

Decision to enter

compress mode



Measurement Report (GSM)Decision to

handover to GSM

Measurement Control (2D & 2F)

Relocation Required

3G MSC3G MSC

Prepare Handover

BSC

Handover Request

Handover Request ACKPrepare Handover

ResponseRelocation Command

Inter-System Handover Command

Handover Complete

Handover CompltetSend END

Signal RequestIu Release Command

Iu Release Complete


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Inter-RAT 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 Requeset

Prepare Handover

Handover Request

Handover Command

Send End Signal

Request

Inter-System to UTRAN Handover Command

Clear command

Clear complete

UTRAN Capacity Info Confirm

UE Capacity Info Confirm

Relocation Requeset

ACKPrepare Handover RSP

Relocation Complete

Send end signal

responseUE Capacity Info


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wcdma 20utran 20signaling 20procedure 20100208 b v1 2e0

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