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  • WCDMA Air Interface

    LZT 123 7279 R5B Ericsson 2005 - 1 -

    WCDMA Air Interface

    STUDENT BOOK LZT 123 7279 R5B

  • WCDMA Air Interface

    - 2 - Ericsson 2005 LZT 123 7279 R5B

    DISCLAIMER This book is a training document and contains simplifications. Therefore, it must not be considered as a specification of the system. The contents of this document are subject to revision without notice due to ongoing progress in methodology, design and manufacturing. Ericsson assumes no legal responsibility for any error or damage resulting from the usage of this document. This document is not intended to replace the technical documentation that was shipped with your system. Always refer to that technical documentation during operation and maintenance.

    Ericsson 2005 This document was produced by Ericsson. It is used for training purposes only and may not be copied or

    reproduced in any manner without the express written consent of Ericsson.

    This Student Book, LZT 123 7279, R5B supports course number LZU 108 5306 .

  • Table of Contents

    LZT 123 7279 R5B Ericsson 2005 - 3 -

    Table of Contents

    WCDMA AIR INTERFACE.....................................................................1

    1 WCDMA WIRELESS TECHNOLOGY...........................................9

    ITS ALL ABOUT SERVICES ..............................................................13

    WCDMA BACKGROUND ....................................................................13

    WCDMA AIR INTERFACE ...................................................................14

    WCDMA MILESTONES .......................................................................14

    EVOLUTION FROM 2G TO 3G............................................................15

    PRESENT FUNCTIONALITY...............................................................15 WCDMA RADIO ACCESS BEARERS (RABS)...............................................16 MULTIPLE ACCESS TECHNOLOGIES .........................................................17

    TDMA TRANSMITTER.........................................................................18

    WCDMA TRANSMITTER.....................................................................19 VOICE CODING..............................................................................................21 ADAPTIVE MULTI-RATE................................................................................24 ERROR DETECTION AND CORRECTION - CRC AND FEC CODING.........26 CHANNELIZATION CODES ...........................................................................40 SCRAMBLING CODES...................................................................................47 MODULATION ................................................................................................56 FILTERING .....................................................................................................58

    2 WCDMA POWER CONTROL, RAKE RECEIVER AND HANDOVER ................................................................................65

    WCDMA RECEPTION ISSUES ...........................................................69

    WCDMA POWER CONTROL ..............................................................70

    MULTIPATH FADING ...........................................................................72

    THE RAKE RECEIVER........................................................................74

    WCDMA HANDOVER..........................................................................78

    CELL PLANNING ................................................................................82 FDMA/TDMA...................................................................................................82

  • WCDMA Air Interface

    WCDMA ..........................................................................................................83

    CAPACITY MANAGEMENT ................................................................86 ADMISSION CONTROL .................................................................................87 CONGESTION CONTROL .............................................................................87

    3 WCDMA PHYSICAL LAYER.......................................................89

    3GPP....................................................................................................93 WCDMA OSI MODEL .....................................................................................99

    WCDMA DOWNLINK.........................................................................102 LOGICAL CHANNELS ..................................................................................105 TRANSPORT CHANNELS ...........................................................................105 PHYSICAL CHANNELS................................................................................106 CHANNELIZATION CODE INDEX ...............................................................108 COMMON PILOT CHANNEL........................................................................109 PRIMARY COMMON CONTROL PHYSICAL CHANNEL AND SYNCHRONIZATION CHANNEL .................................................................110 SECONDARY COMMON CONTROL PHYSICAL CHANNEL ......................111 PAGING INDICATOR CHANNEL .................................................................111 DEDICATED PHYSICAL CONTROL AND DATA CHANNEL.......................112 MULTIPLEXING............................................................................................117

    WCDMA UPLINK ...............................................................................121 DEDICATED PHYSICAL CONTROL AND DATA CHANNEL.......................123 MULTIPLEXING............................................................................................125 RANDOM ACCESS CHANNEL ....................................................................126 HPSK MODULATION ...................................................................................127

    4 SYNCRONIZATION AND RANDOM ACCESS .........................131

    BASE STATION DOWNLINK TIMING ...............................................135

    SYNCHRONIZATION PROCEDURE .................................................136 DOWNLINK SCRAMBLING CODES ............................................................136 SYNCHRONIZATION CODES......................................................................136

    RANDOM ACCESS PROCEDURE....................................................140

    DEDICATED CHANNEL PROCEDURE.............................................145

    WCDMA SOFT HANDOVER .............................................................146

    - 4 - Ericsson 2005 LZT 123 7279 R5B

  • Table of Contents

    5 HSDPA GENERAL PRINCIPLES..............................................149

    INTRODUCTION................................................................................151

    INTRODUCTION................................................................................151

    GENERAL PRINCIPLES ...................................................................152 SHORT TTI (2 MS) .......................................................................................153 SHARED CHANNEL TRANSMISSION.........................................................153 HIGHER-ORDER MODULATION .................................................................154 FAST LINK ADAPTATION ............................................................................157 FAST CHANNEL DEPENDENT SCHEDULING ...........................................159 FAST HYBRID ARQ WITH SOFT COMBINING ...........................................160 DYNAMIC POWER ALLOCATION ...............................................................163

    HSDPA CHANNEL STRUCTURE......................................................164 HS-DSCH - HIGH-SPEED DOWNLINK SHARED CHANNEL......................165 HS-PDSCH - HIGH-SPEED PHYSICAL DOWNLINK SHARED CHANNEL.166 HS-SCCH - HIGH SPEED - SHARED CONTROL CHANNEL......................167 HS-DPCCH - HIGH-SPEED DEDICATED PHYSICAL CONTROL CHANNEL .....................................................................................................169 OVERALL TIMING RELATION .....................................................................173

    APPENDIX A: ABBREVIATIONS......................................................175

    INDEX ................................................................................................181

    LZT 123 7279 R5B Ericsson 2005 - 5 -

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  • Table of Contents

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  • 1 WCDMA Wireless Technology

    LZT 123 7279 R5B 2005 Ericsson - 9 -

    1 WCDMA Wireless Technology

    Objectives Upon completion of this chapter the student will be able to:

    Explain the fundamental principles of cellular WCDMA technology.

    Explain and compare TDMA and WCDMA multiple access methods.

    Explain on an overview level, the WCDMA transmitter architecture.

    Explain the data protection coding methods: CRC Coding, FEC Coding, Viterbi decoding, block interleaving, turbo codes.

    Explain the use of channelization and scrambling codes. Explain the modulation and filtering in a WCDMA system.

    Figure 1-1: Objectives

  • WCDMA Air Interface

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    Contents

    ITS ALL ABOUT SERVICES ............................