Channel Structure in WCDMA

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Channels In WCDMA Introduction

2004-06-01


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Channel Hierarchical Structure

Channel Introduction

Channel In UE Procedure


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Physical channel characteristics of WCDMA



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Logical hannel

Transport hannel

FTP VOD

TCP UDP

Physical hannel able

For Physical Channel:

TDMA decides when to send

CDMA decides how to multiplex


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Physical Channel Function

Channel Mapping




Physical Channel Function

hannel Direction

Purpose

SCH Down UE synchronize the network

PCPICH Down UE gets the cell scramble code and channel reference

PCCPCH Down Send the system information

AICH Down Send the access indication

PICH Down Send the paging indication

SCCPCH Down Send paging information, UE dedicated downlink information

PRACH Up Send uplink access request and some small dedicated message

DPDCH Up/Down Send UE dedicated information

DPCCH Up/Down Send UE dedicated physical channel control information

Common Channel Dedicated Channel



Channel Mapping

Channel Mapping

Transport Channels

DCH

RACH

BCH

FACH

PCH

Physical Channels

Dedicated Physical Data Channel (DPDCH)

Dedicated Physical Control Channel (DPCCH)

Common Pilot Channel (CPICH)

Primary Common Control Physical Channel (P-CCPCH)

Secondary Common Control Physical Channel (S-CCPCH)

Synchronization Channel (SCH)

Acquisition Indicator Channel (AICH)

Paging Indicator Channel (PICH)




Cell Selection

RRC Connection Setup

LAU and RAU

Originated Call

Terminated Call

Packet Service Request




Cell Selection

Synchronize the network (SCH)

Get cell scramble code (PCPICH)

Read system information (BCH-PCCPCH)





Send access preamble (PRACH)

Get access indication (AICH)

Send RRC connection request (PRACH)

Get RRC setup command (FACH-SCCPCH)

Send RRC setup complete (DCCH-DPDCH)


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Originated Call

RRC connection setup

Authentication, integrity protection and

ciphering, Identity request (DCCH-DPDCH)

Alerting, connect, connect acknowledge

(DCCH-DPDCH)

RAB Assignment (DCH-DPDCH)

Voice, Video (DTCH-DPDCH)

Setup, call proceeding (DCCH-DPDCH)




Terminated Call




Alerting, connect, connect acknowledge

(DCCH-DPDCH)


Voice, Video (DTCH-DPDCH)

Setup, call confirmed (DCCH-DPDCH)

Get paging indication (PICH)

Confirm the paging number, cause (PCH-SCCPCH)




Packet Service Request




PDP activation accept (DCCH-DPDCH)


Packet data (DTCH-DPDCH)

PDP activation request (DCCH-DPDCH)


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Appendix 1

Cell Selection Read System Information (BCH-PCCPCH)

Evaluate cell selection criteria

Read cell-reselection information

Read common channel configuration

Read network information (access criteria,

service, etc.)


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Appendix 2


Send RRC Connection Request (CCCH-PRACH)

Establishment cause, signal strength, etc.

Get RRC Connection Setup Command (FACH-

SCCPCH) Channel configuration (physical, transport, logical)

Send RRC Setup Complete (DCCC-DPDCH)

UE radio access capability (physical, transport, logic channel,

RF, measurement, RAT, etc.)


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Appendix 3

Security procedure

Authentication (DCCH-DPDCH)

Authenticate the network

Authenticate the UE

Integrity Protection and Ciphering (DCCH-DPDCH) Integrity and ciphering algorithm negotiation

Identity Request (DCCH-DPDCH)

Get user identity


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Appendix 4

RAB Assignment

Establish new RB

Establish new RB, reconfigure the physical and transport

channel

Establish and reconfigure the transport channel

Reconfigure the physical channel

Channel Structure in WCDMA

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