W(Level1) UMTS UTRAN Signaling Procedures 20050614 a 1[1].0

7/28/2019 W(Level1) UMTS UTRAN Signaling Procedures 20050614 a 1[1].0

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Wireless Curriculum Development Section

ISSUE

UMTS UTRAN Signaling Procedures

1.0


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Confidential Information of Huawei.

No Spreading without Permission. Security Level: Internal

Course Contents

Chapter 1 UTRAN Network Overview

Chapter 2 Basic Signaling Process


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UTRAN Overview

UE Working Mode and State

Serving RNCDrift RNC and Control RNC

Source RNC and Target RNC


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UE Working Modes and states

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.


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

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 ondifferent 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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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

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


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URA-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 actionDTXand save power

RRC connect ion


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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 CRNC

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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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

CRNC

Iub

Node B

Cell Cell Cell

Node B

...

CN

Iu


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Source 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

RNC is the SRNC after SRNs Relocation

CNCN

Source

RNCTarget

RNC

Serving

RNC

Iu Iu

Iur RNC


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Course Contents

Chapter 1 UTRAN Network Overview

Chapter 2 Basic 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 Procedures

Network side Start

1Initialize equipment2Process system

broadcast

Step 1

Handset Power on

1cell reselection2

Location registration3Waiting 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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2.4 Call 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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2.4 Call 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 INITIAL DIRECT TRANSFER

RANAP: INITIAL UE MESSAGE

RRC DTRANAP DT

RANAP DT

RRC DT

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 RRC CONNECTION RELEASE

RRC RRC 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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2.4 Call process



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Paging Flow (UE in Idle State or PCH State)

CNSRNCUE

RANAP PAGING

RRC PAGING 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 Serving

RNC

CN

RRCRRC2. DCCH: Paging

RANAP RANAP1. Paging


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RRC Connection Establishment Flow(DCH)

5. Downlink Synchronisation

U E N od e B

Serving RNSServing

RN C

DCH-FPD CH -F P

Allocate RNT I

Select L1 and L2

pa ra m et er s

R RCRRC1. CCCH : RRC C onnection Request

N B A PN B A P

3. Radio L ink Setup R esponse

N B A PN B A P

2. Radio L ink Setup Reques t

RRCR RC7. CCCH : RRC C onnection Setup

Start RX

Start TX

4. ALCAP Iub Data Transport Bearer Setup

R RCRRC9. D C CH : RRC Connection Setup Complete

D CH -F PD CH -F P6. Uplink Synchronisation

N B A PN B A P

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

RRC

RRC2.DCCH: Initial Direct Transfer

RANAP RANAP3. Initial UE Message


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RAB Establish Flow(DCH-DCH, asynchronous)

UE SRNCNodeB CNRAB ASSIGNMENT REQUEST

ALCAP Establish

RL RECONFIG REQ

RL RECONFIG RESP

ALCAP Establish, synchronization

RRCRB SETUP

RRCRB 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 FlowDCHUE NodeB SRNC CN

IU RELEASE COMMAND

IU RELEASE COMPLETE

ALCAP ReleaseRRCRRC CONNECTION RELEASE

RRCRRC 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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2.4 Call process



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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.


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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 AdditionU E N od e B

D ri ft RN S

Drift

RNC

Serving

RN C

DCH-FPDCH-FP8. D ownlink Synchronisation

RNSAP RNSAP

1. Radio Link Setup

Request

Start TX

N BA P NB AP

2. Radio Link Setup

Request

RNSAP RNSAP

4. Radio Link Setup Response

N B AP N BAP

3. Radio Link Setup

Response

Start RX

Decision to setup

new RL

RRCRRC11. D CC H : Active Set Update Com plete

RRCRRC

10. D CCH : Active Set Update

[Radio Link Add ition]

ALCAP Iur B earer Setup5. ALCAP Iub Bearer Setup

DCH-FPDCH-FP9. Uplink Synchronisation

RNSAP RNSAP

7. Radio Link Restore

Indication

N B AP NB AP

6. Radio Link Restore

Indication


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Soft Handover - Radio Link Deletion

UE Node B

Drift RNS

Drift

RNC

Serving

RNC

RRCRRC2.DCCH: Active Set Update Complete

Decision to delete

old RL

RNSAP RNSAP

3. Radio Link DeletionRequest

NBAP NBAP

4. Radio Link Deletion

Request

RNSAP RNSAP6. Radio Link DeletionResponse

NBAP NBAP

5. Radio Link Deletion

Response

Stop RX and TX

RRCRRC

1.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)cant exist simultaneously

CN

SRNC RNC

NodeBNodeB

CN

SRNC RNC

NodeBNodeB


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RNSAPRNSAP1. Radio Link Setup Request

UE Node B

Source

Node B

Target

RNC

Source

RNC

Target

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 NBAP

12. 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

RNSAP

5. 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)


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Hard Handover FlowUMTS->GSM

MAP/E MAP/E

2. Prepare

Handover

BSSMAP BSSMAP4. Handover

Request Ack

RANAP RANAP

13. Iu Release

Complete

BSSMAP BSSMAP

3. Handover

Request

MAP/E MAP/E

5. 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 SignalRequest

MAP/E MAP/E

14. Send End Signal

Response

RANAP RANAP1. Relocation

Required

UE Node B

RNC

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 underURA_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 entitylosing connection, and to monitor RRC connection state.


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Cell Update with SRNS relocation

UE Source RNC CNTarget RNC

2. Uplink SignallingTransfer Indicatio n

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

1.CCCH: Cell Update

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

RRC-relayRRC

RNSAP RNSAP

4.DCCH: Cell Update Confirm

[S

-

RNTI, SRNC

-

ID, new S

-

RNTI,

new SRNC -ID, new C -RNTI]

RRCRRC

5.DCCH: UTRAN Mobility Information ConfirmRRCRRC

3. Serving RNC Relocation


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Cell Update via Iur without SRNS relocation

UE DRNCsource

DRNCtarget

SRNC

RNSAP RNSAP8. Common Transp. Channel Resources Release

RNSAPRNSAP

2. Uplink Signalling TransferIndication

[new C-RNTI,D-RNTI,

UL message]

RNSAP

3. Common Transp. Channel Resources

Initialization Request

RNSAP

RRC1. CCCH: Cell Update

RRC-relay

RRC6. DCCH: Cell Update Confirm

RRC

RRC7.DCCH: UTRAN Mobility Information Confirm

RRC

RNSAPRNSAP

4. Common Transp. Channel ResourcesInitialization Response

5. ALCAP Iur bearer setup

Inter-RNS URA Update via Iur without


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p

SRNS relocation

UETarget

RNC

5.CCCH: URA Update Confirm

Source

RNC

2.Uplink Signaling Transfer Indication

Serving

RNC

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

1.CCCH: URA Update

[U-RNTI, URA update cause]

RRC-relayRRC

3. Decision Not to

perform SRNS

relocation

RRC RRC-relay

RNSAP

RNSAP

4. Downlink Signaling Transfer Request

RNSAP

RNSAP


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Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal

Cell Reselection FlowUMTS->GPRS

UE CN

2. UE Access GPRS system

Serving

RNC

RANAP RANAP

4. Iu Release Command

RANAP RANAP4. Iu Release Complete

GPRS

1. UE releases connection with RNC

3. Inter-system information exchange

data transfer


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Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal

Cell reselection FlowGPRS->UMTSUE Serving

RNC

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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W(Level1) UMTS UTRAN Signaling Procedures 20050614 a 1[1].0

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