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  • WCDMA Radio Network Tuning

    LZT 123 8000 R3A Ericsson 2007 - 1 -

    WCDMA Radio Network Tuning

    STUDENT BOOK LZT 123 8000 R3A

  • WCDMA Radio Network Tuning

    - 2 - Ericsson 2007 LZT 123 8000 R3A

    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 2007 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 8000, R3A supports course number LZU 108 6273.

  • Table of Contents

    LZT 123 8000 R3A Ericsson 2007 - 3 -

    Table of Contents

    1 WCDMA RAN TUNING INTRODUCTION .....................................5

    INTRODUCTION....................................................................................6

    WCDMA RAN TUNING..........................................................................9

    2 PREPARATIONS.........................................................................13

    PREPARATIONS .................................................................................15 HIGH LEVEL RADIO DESIGN REVIEW.........................................................15 DEFINING CLUSTERS AND DRIVE TEST ROUTES ....................................16 DESIGN AND CONSISTENCY CHECK .........................................................18 SITE STATUS .................................................................................................33 SETUP OF DRIVE TEST TOOLS...................................................................33

    3 PILOT TUNING............................................................................41

    DATA COLLECTION/DRIVE TESTING ...............................................43 TEMS INVESTIGATION .................................................................................43

    POSTPROCESSING............................................................................50 DATA COLLECTION.......................................................................................51 ROUTE ANALYSIS .........................................................................................53

    ANALYSIS............................................................................................58 PILOT COVERAGE ........................................................................................58 INTERFERENCE ............................................................................................67 SCRAMBLING CODE PLAN VERIFICATION ................................................72 MISSING NEIGHBOR.....................................................................................73

    CHANGE PROPOSALS ......................................................................75

    4 UE TUNING CIRCUIT SWITCHED DATA................................79

    DATA COLLECTION UE TUNING ....................................................81 TEMS INVESTIGATION DATA COLLECTION...............................................81

    POSTPROCESSING............................................................................86 TEMS INVESTIGATION ROUTE ANALYSIS .................................................86

    ANALYSIS............................................................................................88

  • WCDMA Radio Network Tuning

    - 4 - Ericsson 2007 LZT 123 8000 R3A

    ACCESSIBILITY .............................................................................................88 RETAINABILITY..............................................................................................97 INTEGRITY ...................................................................................................105

    5 UE TUNING PACKET DATA..................................................107

    TEMS INVESTIGATION UE PACKET DATA TUNING....................109

    TEMS INVESTIGATION KEY PERFORMANCE INDICATORS......... 111 ACCESSIBILITY ...........................................................................................111 RETAINABILITY............................................................................................117 PACKET THROUGHPUT .............................................................................120 PARAMETERS .............................................................................................129 SPREADING FACTOR USAGE....................................................................130

    HSDPA INTRODUCTION...................................................................131 HSDPA FEATURE ........................................................................................131 HSDPA TUNING WORKFLOW ....................................................................133 TRAFFIC CASE SETUP OF A HSDPA CONNECTION ............................137 HS-DSCH CELL SELECTION ......................................................................138 HS-DSCH CELL CHANGE ...........................................................................141 HSDPA THROUGHPUT ...............................................................................144 SYSTEM AND UE CAPABILITIES................................................................150

    6 ACRONYMS AND ABBREVIATIONS ..........................................153

  • Table of Contents

    LZT 123 8000 R3A Ericsson 2007 - 5 -

    1 WCDMA RAN Tuning Introduction

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

    Explain the service content of WCDMA RAN Tuning Explain the service content of WCDMA RAN Optimization Explain the difference between RAN Tuning and RAN

    Optimization

    Describe the general tuning process

    Figure 1.1 Chapter Objectives

  • WCDMA Radio Network Tuning

    - 6 - Ericsson 2007 LZT 123 8000 R3A

    INTRODUCTION It is important to understand the WCDMA RAN tuning and optimization process in order to improve the radio network performance and the perceived end-user quality.

    This book is aimed for network engineers who need to understand the main issues in initial tuning an Ericsson WCDMA radio network. It explains the different steps and tools needed to achieve this from an Ericsson perspective. Common radio related problems are presented and analyzed and the purpose is to create a deeper understanding of radio network tuning, resulting in improvements in radio network performance.

    WCDMA RAN is the Radio Access Network for UMTS that provides the connection between the Core Network (CN) and the User Equipment (UE) (Figure 1-2).

    Figure 1-2: WCDMA Radio Access Network.

    The WCDMA RAN comprises of Radio Network Controllers (RNCs) and Radio Base Stations (RBSs) built on the Connectivity Packet Platform (CPP). To enable communication between the different Network Elements (NEs) in the WCDMA RAN and between the WCDMA RAN and the Core Network, different interfaces are defined and used. Over the interfaces, transport of signalling and user data is performed via a Transport Network Infrastructure using Asynchronous Transfer Mode (ATM).

  • Table of Contents

    LZT 123 8000 R3A Ericsson 2007 - 7 -

    The WCDMA RAN also comprises of interfaces towards different external management systems. Operation and Maintenance is handled by the embedded management in the RNC and RBS and the sub network manager Operation System Support Radio-Core (OSS-RC). OSS-RC is used with the Test Mobile Systems (TEMS) tools. The O&M is supported by an Operation and Maintenance Infrastructure (OMINF).

    TEMS Visualization works with data gathered by the optional event-based data features found in Ericsson OSS-RC. For WCDMA, this function is known as the General Performance Event Handler (GPEH).TEMS Visualization follows calls over the BSC border, allowing the user to analyze Intra-BSC handovers and follow all calls made in the recording area.

    Ericsson provides two services to improve the RAN:

    RAN Tuning RAN Optimization

    TuningzEstablish network performance mainly using drive tests:

    To ensure it is possible to drive in the network without dropping calls To ensure it is possible to set up calls in the coverage area

    zAnalyze and describe underlying problems related to: Design UEs Systems

    Optimizationz Identify and improve radio network problems using statistics, recordings and eventszEstablish subscriber behavior and perceptionzEnsure that traffic growth can be handled

    Figure 1-3: RAN services

    RAN Tuning is required to ensure good network quality and identifies and solves radio network problems after the network has been installed.

  • WCDMA Radio Network Tuning

    - 8 - Ericsson 2007 LZT 123 8000 R3A

    RAN tuning is done to provide operators with a detailed understanding of the underlying problems to address, such as network design, UEs and system. It is performed when all necessary nodes in the area are installed and operational and when the network is stable and not yet commercially used. It is also performed when new sites are installed in already commercially launched areas.

    Figure 1-4, below shows the tuning process:

    Voice tuning

    Packet tuningVideo tuning

    RF tuning