02 WCDMA UTRAN Interface and Signaling Procedure

WCDMA UTRAN Interface and Signaling Procedure

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Objectivesl

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

Understand UTRAN interface and structure Understand the definitions about UTRAN network elements Understand UTRAN signaling procedure

Contents1. UTRAN Network Overview 2. Basic Concepts about UTRAN 3. UTRAN Signaling Procedure

UMTS StructureCore Network Iu RNS Iur RNC Iub NodeB Iub NodeB Iub NodeB RNC Iub NodeB RNS Iu

Uu InterfaceGC Nt DC Duplication avoidance GC C-plane signaling Nt DC U-plane information control UuS boundary

RRC control control control control

L3 Radio Bearers PDCP PDCP BMC L2/PDCP L2/BMC

RLC RLC RLC

RLC RLC

L2/RLC

Logical Channels MAC L2/MAC Transport Channels L1

General Protocol Mode for UTRAN Terrestrial Interfacel

The structure is based on the principle that the layers and planes are logically independent of each other.Radio Network Layer Control Plane Application ProtocolTransport Network User Plane Transport Network Control Plane

User Plane Data Stream(s)

Transport Network Layer

Transport Network User Plane

ALCAP(s) Signalling Bearer(s) Signalling Bearer(s)Physical Layer

Data Bearer(s)

RNL Control Plane Application ProtocolCNRANAP RRC RNSAP

RNCNBAP

NodeBNBAP RANAP RNSAP RRC Node B Application Part Radio Access Network Application Part Radio Network Subsystem Application Part Radio Resource ControlPage8

Iu-CS InterfaceRadio Network LayerControl Plane RANAP User plane Iu UP

Transport Network Control Plane

ALCAP ALCAPSCCP A MTP3-B SAAL NNI B MTP3-B SAAL NNI AAL2 PATH

ATM Physical Layer

Iu-PS InterfaceRadio Network LayerControl Plane RANAP User plane Iu UP

Transport Network User Plane SCCP MTP3-B

Transport Network User Plane GTP-U C UDP IP AAL Type 5

SAAL NNI

ATM Physical Layer

Iub InterfaceRadio Network Layer Control Plane NBAP NCP CCP Transport Network Control Plane Transport Network Layer Transport Network User Plane ALCAP ALCAP Transport Network User Plane User plane Iub FP

SAAL UNI

AAL2 PATH

ATM Physical Layer

Iur InterfaceRadio Network LayerControl Plane RANAP User plane Iur Data Stream Transport Network Control Plane

ALCAP ALCAPSCCP A MTP3-B SAAL NNI B MTP3-B SAAL NNI AAL2 PATH

ATM Physical Layer

SRNC / DRNCCNIu Iur

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 DRNCsPage14

CRNCCNIu

... ...Cell

NodeBCell Cell

The CRNC owns the radio resources of a cell

RAB, RB and RL

RAB RB UE RL NodeB

UE Working Modes and Statesl l

Idle Mode Connected Modep

Cell_DCH Cell_FACH Cell_PCH URA_PCH

Idle Model

The UE has no relation to UTRAN, only to CN. For data transfer, a signalling connection has to be established. UE camps on a cellp

It enables the UE to receive system information from the PLMN UE can receive paging message from the PICH of a cell It enables the UE to receive cell broadcast services.

The idle mode tasks can be divided into three processes:p

PLMN selection and reselection Cell selection and reselection Location registration

Connected Model

When UE is in connected mode, there is normally an RRC connection between UE and UTRAN.

The UE position can be known on different levels:p

Cell level UTRAN Registration Area (URA) level Dedicated transport channels (DCH) Common transport channels (RACH / FACH, DSCH)

Connected Model

Cell-DCHp

In active state Communicating via its dedicated channels UTRAN knows which cell UE stays in

Connected Model

Cell-FACHp

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 needs to monitor the FACH for its information UTRAN knows which cell the UE stays in

Connected Model

Cell-PCHp

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

Connected Model

URA-PCHp

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

UE Working Modes and States- Reduce activity further - Avoid unnecessary signaling

RRC Connection

- Reduce activity, DTX, and save power

URA_PCH

CELL_PCH

CELL_DCH- Dedicated channel - Common service, such as voice

CELL_FACH- Common channel - PS service with few data to transmit

- Monitor paging channel - Cell re-selection

- Scan networks (PLMN) - Camp on a cell

Copyright 200

02 WCDMA UTRAN Interface and Signaling Procedure

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