UMTS UTRAN Signaling Procedures

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Transcript of UMTS UTRAN Signaling Procedures

UMTS UTRAN Signaling ProceduresISSUE 1.0

Wireless Curriculum Development Section

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 RNCSource 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 RRCconnection, 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

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

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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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 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 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 toother URA. A better way to lower the resource occupancy and signaling transmission

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UE states- Reduce actionDTXand save power RRC connectionURA_PCH CELL_PCH

CELL_DCH

CELL_FACH

- Dedicated Channel - Radio bearers Transmission ServicesIDLE

- upper layer Signaling trigger (CN) - Monitor paging channel - cell re-selection

DEAD

- Scanning networks (PLMN) - Camp on cell

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SRNC/DRNCCN Iu SRNC Iur 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 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

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CRNCCN Iu CRNC Iub Node BCell Cell Cell

...Node B

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

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Source RNC/Target RNCCN CN Iur Target RNC RNC

Iu Source RNC

Iu Serving 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

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Course Contents

Chapter 1 UTRAN Network Overview Chapter 2 Basic Signaling Process

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Basic Signaling Procedures2.1 2.2 2.3 2.4 2.5

Call overall process Network start process UE registration process

Call processConnection mobility management process

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Call overall ProceduresNetwork side Start 1Initialize equipment 2Process system broadcast Step 1 Handset Power on 1cell reselection 2Location registration 3Waiting for call Step 2 Paging UE Step 3

RRC connection

Establish

Step 6 Soft/hard handover

Step 6 RAB/RB modification

Step 6 Physical channel reconfiguration

Step 6 Transport channel reconfiguration

Step 5 RAB set up 1synchronous set up 2asynchronous set up

Step 4

NAS signaling connection establish

Step 6 URA update

Step 6 Cell update Step 7 Step 8 Waiting for call again 1cell selection 2wait for call

Step 6 Handover with GSM

RRC connection release

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Basic Signaling Procedures2.1 2.2 2.3 2.4 2.5

Call overall process Network start process UE registration process

Call processConnection mobility management process

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System Information Broadcast Flow

UE

Node B1.System Information Update Request NBAP

RNC

CN

NBAP

2.System Information Update Response . NBAP NBAP

RRC

3.BCCH:System Information .

RRC

RRC

4.BCCH:System Information .

RRC

RRC

5.BCCH:System Information

RRC

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Basic Signaling Procedures2.1 2.2 2.3 2.4 2.5

Call overall process Network start process UE registration process

Call processConnection mobility management process

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RRC Connection Establishment Flow(CCH)UERRC: RRC CONNECTION REQUEST

NodeB

SRNC

RRC: RRC CONNECTION SETUP

RRC: RRC CONNECTION SETUP COMPLETE

UE originate RRC connection setup for registration. SRNC decides to establish RRC connection on common channel, and uses pre-configured common channel resources.HUAWEI TECHNOLOGIES PHILIPPINES, INC.

NAS Signaling Establishment FlowUERRC NITIAL DIRECT TRANSFER I RANAP: INITIAL UE MESSAGE RRC T D RANAP T D RANAP T D RRC T D

SRNC

CN

UE changes DT messages with CN, such as Authentication, connection establishment, location registration, etc.HUAWEI TECHNOLOGIES PHILIPPINES, INC.

RRC Connection Release Flow(CCH)UE NodeB SRNC CN

IU RELEAS COMMAND E IU RELEAS COMPLETE E

RRC RC CONNECTION RELEAS R E RRC RC CONNECTION RELEAS COMPLETE R E

In registration process, UE does not use dedicated user plane resources. Instead, it release signaling link directly. Thus registration procedure ends.HUAWEI TECHNOLOGIES PHILIPPINES, INC.

Basic Signaling Procedures2.1 2.2 2.3 2.4 2.5

Call overall process Network start process UE registration process

Call processConnection mobility management process

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Paging Flow (UE in Idle State or PCH State)

UE

SRNCRANAP AGING P RRC AGING TYPE 1 P

CN

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)UE Serving RNC CN

RANAP

1. Paging

RANAP

2. DCCH : Paging RRC RRC

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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RRC Connection Establishment Flow(DCH)UE N ode B S ervin g R N S S erving RNC

1 . C C C H : R R C C o nnectio n R eq uest RRC RRC

A llo cate R N T I S elect L 1 and L 2 p aram eters 2 . R ad io L ink S etup R eq uest NBAP NBAP

S tart R X d escrip tio n 3 . R ad io L ink S etup R esp o nse NBAP NBAP

4 . A L C A P Iub D ata T ransp o rt B earer S etup 5 . D o w nlink S ynchro nisatio n D C H -F P 6 . U p link S ynchro nisatio n D C H -F P S tart T X d escrip tio n 7 . C C C H : R R C C o nnectio n S etup RRC 8 . R ad io L ink R esto re Ind icatio n NBAP 9 . D C C H : R R C C o nnectio n S etup C o m p lete RRC NBAP

D C H -F P D C H -F P

RRC

RRC

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NAS Signalling Connection EstablishmentUE Serving RNC CN

1. RRC Connection Establishment

RRC

2. DCCH : Initial Direct Transfer RRC 3. Initial UE Message RANAP RANAP

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

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RAB Establish Flow(DCH-DCH, synchronous)UE NodeB SRNCRAB ASSIGNMENT REQUESTALCAP Establish

CN

RL RECONFIG PRE RL RECONFIG READYALCAP Establish, synchronization

RL RECONFIG COMMIT RRCRB SETUPRRCRB SETUP