UMTS UTRAN Signaling Procedures

48
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Transcript of UMTS UTRAN Signaling Procedures

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UMTS UTRAN Signaling ProceduresUMTS UTRAN Signaling Procedures1.01.0

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Course ContentsCourse Contents

Chapter 1 UTRAN Network OverviewUTRAN Network Overview

Chapter 2 Basic Signaling Process

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UTRAN OverviewUTRAN Overview

UE Working Mode and State

Serving RNC、 Drift RNC and Control RNC

Source RNC and Target RNC

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UE Working Modes and states UE Working Modes and statesIdle 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.

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UE Working Modes and states UE Working Modes and states

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

H)

When at least one signalling connection exists, the UE is in

connected mode and there is normally an RRC connection

between UE and UTRAN. The UE position can be known on

different levels:

UTRAN Registration Area (URA) level

The UE position is known on URA level. The URA is a set of cells

Cell level

The UE position is known on cell level. Different transport channel

types can be used for data transfer:

Common transport channels (RACH / FACH, DSCH, CPCH)

Dedicated transport CHannels (DCH)

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UE Working Modes and states UE Working Modes and states

Cell-DCH

In active state

Communicating via its dedicated channels

UTRAN knows which cell UE is in.

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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.

UTRAN knows which cell UE is in.

Cell-PCH

No data to be transmitted or received.

Monitor PICH, to receive its paging.

lower the power consumption of UE.

UTRAN knows which cell UE is in.

UTRAN have to update cell information of UE when UE roams to

another cell

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URA-PCH StateURA-PCH State

URA-PCH

No data to be transmitted or received.

Monitor PICH.

UTRAN only knows which URA (UTRAN Registration Area,

which consists of multiple cells) that UE is in.

UTRAN update UE information only after UE has roamed to

other URA.

A better way to lower the resource occupancy and signaling

transmission

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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

SRNC and DRNC are on a per connection basis between a UE

and the UTRAN

The SRNC handles the connection to one UE, and may borrow ra

dio resources of a certain cell from the DRNC

Drift RNSs support the Serving RNS by providing radio resources

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

can has 0 or multiple DRNCs

CN

SRNC DRNCIu

Iur

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CRNCCRNC

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

CRNC

Iub

Node BCell Cell Cell

Node B

...

CN

Iu

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Source RNC/Target RNCSource RNC/Target RNC

The SRNS Relocation function coordinates the activities when the

SRNS role is to be taken over by another RNS.

Source RNC is the SRNC before SRNs Relocation and Target RN

C is the SRNC after SRNs Relocation

CNCN

Source RNC

TargetRNC

ServingRNC

Iu IuIur RNC

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Course ContentsCourse Contents

Chapter 1 UTRAN Network OverviewChapter 1 UTRAN Network Overview

Chapter 2 Basic Signaling ProcessBasic Signaling Process

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Basic Signaling Procedures

2.1 Call overall process

2.2 Network start process

2.3 UE registration process

2.4 Call process

2.5 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 Procedures

2.1 Call overall process

2.2 Network start process

2.3 UE registration process

2.4 Call process

2.5 Connection mobility management process

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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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Basic Signaling Procedures

2.1 Call overall process

2.2 Network start process

2.3 UE registration process

2.4 Call process

2.5 Connection mobility management process

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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.

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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.

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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.

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Basic Signaling Procedures

2.1 Call overall process

2.2 Network start process

2.3 UE registration process

2.4 Call process

2.5 Connection mobility management process

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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.

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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

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RRC Connection Establishment Flow(DCH)

5. Downlink Synchronisation

UE Node B Serving RNS

Serving RNC

DCH-FP DCH-FP

Allocate RNTI Select L1 and L2

parameters

RRC RRC

1. CCCH : RRC Connection Request

NBAP NBAP

3. Radio Link Setup Response

NBAP NBAP

2. Radio Link Setup Request

RRC RRC

7. CCCH : RRC Connection Setup

Start RX description

Start TX description

4. ALCAP Iub Data Transport Bearer Setup

RRC RRC

9. DCCH : RRC Connection Setup Complete

DCH-FP DCH-FP 6. Uplink Synchronisation

NBAP NBAP

8. Radio Link Restore Indication

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NAS Signalling Connection Establishment

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

UE ServingRNC

CN

1. RRC Connection Establishment

RRCRRC2. DCCH : Initial Direct Transfer

RANAP RANAP3. Initial UE Message

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RAB Establish Flow(DCH-DCH, synchronous)

UE SRNCNodeB CN

RAB ASSIGNMENT REQUEST

ALCAP Establish

RL RECONFIG PRE

RL RECONFIG READY

ALCAP Establish, synchronization

RRC: RB SETUP

RRC: RB SETUP COMPLETERAB ASSIGNMENT RESPONSE

RL RECONFIG COMMIT

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

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RAB Establish Flow(DCH-DCH, asynchronous)

UE SRNCNodeB CNRAB ASSIGNMENT REQUEST

ALCAP EstablishRL RECONFIG REQ

RL RECONFIG RESP

ALCAP Establish, synchronization

RRC: RB SETUP

RRC: RB SETUP COMPLETE

RAB ASSIGNMENT RESPONSE

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Transport Channel Reconfig Flow(Synchronised )

UE NodeB SRNC

RL RECONFIG PREPARE

RL RECONFIG READY

RL RECONFIG COMMIT

TRANSPORT CHANNEL RECONFIG

TRANSPORT CHANNEL RECONFIG COMPLETE

ALCAP Establish, synchronization

ALCAP Release

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Physical Channel Reconfig Flow

UE NodeB SRNC

RL RECONFIG PREPARE

RL RECONFIG READY

RL RECONFIG COMMIT

PHYSICAL CHANNEL RECONFIG

PHYSICAL CHANNEL RECONFIG COMPLETE

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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.

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Basic Signaling Procedures

2.1 Call overall process

2.2 Network start process

2.3 UE registration process

2.4 Call process

2.5 Connection mobility management process

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Soft HandoverSoft 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.

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Soft Handover Illustration (Intra RNC)

Before Soft Handover After Soft Handover

CN

SRNC

NodeBNodeB

CN

SRNC

NodeBNodeB

CN

SRNC

NodeBNodeB

During Soft Handover

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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

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Soft Handover - Radio Link Addition

UE Node B

Drift RNS Drift RNC

Serving RNC

DCH-FP DCH-FP 8. Downlink Synchronisation

RNSAP RNSAP

1. Radio Link Setup Request

Start TX description

NBAP NBAP

2. Radio Link Setup

Request

RNSAP RNSAP

4. Radio Link Setup Response

NBAP NBAP

3. Radio Link Setup Response

Start RX description

Decision to setup new RL

RRC RRC

11. DCCH : Active Set Update Complete

RRC RRC

10. DCCH : Active Set Update

[Radio Link Addition]

ALCAP Iur Bearer Setup 5. ALCAP Iub Bearer Setup

DCH-FP DCH-FP 9. Uplink Synchronisation

RNSAP RNSAP

7. Radio Link Restore Indication

NBAP NBAP

6. Radio Link Restore Indication

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Soft Handover - Radio Link Deletion

UE Node BDrift RNS

DriftRNC

ServingRNC

RRCRRC2. DCCH : Active Set Update Complete

Decision to deleteold RL

RNSAP RNSAP

3. Radio Link DeletionRequest

NBAP NBAP

4. Radio Link DeletionRequest

RNSAP RNSAP

6. Radio Link DeletionResponse

NBAP NBAP

5. Radio Link DeletionResponse

Stop RX and TX

RRCRRC1. DCCH : Active Set Update

[Radio Link Deletion]

ALCAP Iur Bearer Release7. ALCAP Iub Bearer Release

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Hard Handover Illustration (Intra-RNC)

Before Har Handover 7 After Hard Handover

Radio Link(RL)cannot exist simultaneously

CN

SRNC

NodeBNodeB

CN

SRNC

NodeBNodeB

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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

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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

14. ALCAP Iub Data Transport Bearer Release

RNSAP RNSAP15. Radio Link Deletion Response

16. ALCAP Iur Data Transport Bearer Release

RNSAP5. RL Setup Response

RNSAP

RNSAP11. Radio Link Deletion Request

RNSAP

NBAP NBAP8. Radio Link Failure Indication

RNSAPRNSAP

9. Radio Link Failure Indication

Hard Handover via Iur (DCH on Iur)Hard Handover via Iur (DCH on Iur)

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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

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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.

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Cell Update with SRNS relocation

UE Source RNC

CN Target RNC

2. Uplink Signalling Transfer Indicatio n

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

1. CCCH: Cell Update

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

RRC - relay RRC

RNSAP RNSAP

4. DCCH: Cell Update Confirm

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

RRC RRC

5. DCCH : UTRAN Mobility Information Confirm RRC

RRC

3. Serving RNC Relocation

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Cell Update via Iur without SRNS relocation

UE DRNC source

DRNC target

SRNC

RNSAP RNSAP 8. Common Transp. Channel Resources Release

RNSAP RNSAP 2. Uplink Signalling Transfer

Indication [new C-RNTI,D-RNTI,

UL message]

RNSAP

3. Common Transp. Channel Resources Initialization Request

RNSAP

RRC 1. CCCH: Cell Update

RRC-relay

RRC 6. DCCH: Cell Update Confirm RRC

RRC 7. DCCH: UTRAN Mobility Information Confirm

RRC

RNSAP RNSAP

4. Common Transp. Channel Resources Initialization Response

5. ALCAP Iur bearer setup

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Inter-RNS URA Update via Iur without SRNS relocation

UETargetRNC

5.CCCH: URA Update Confirm

SourceRNC

2.Uplink Signaling Transfer Indication

ServingRNC

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

1.CCCH: URA Update

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

3. Decision Not toperform SRNS

relocation

RRC RRC-relay

RNSAP

RNSAP

4. Downlink Signaling Transfer Request

RNSAP

RNSAP

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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

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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

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