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WiMAX System Level Evaluation Methodology jain/wimax/ftp/wimax... · PDF file 2008-01-04 · WiMAX System Level Simulation WiMAX Forum 5 V0.0.1 Created on 7/6/2006 1:02 PM 5 • Security:

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  • WiMAX Forum

    V0.0.1 Created on 7/6/2006 1:02 PM1WiMAX System Level Simulation

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    WiMAX System Level Evaluation Methodology

    Draft V0.0.4 July 10, 2006

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    V0.0.1 Created on 7/6/2006 1:02 PM2WiMAX System Level Simulation

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    Table of Contents TABLE OF CONTENTS ................................................................................................................................................. 2

    1. INTRODUCTION ........................................................................................................................................................ 4 1.2 PHYSICAL LAYER DESCRIPTION ................................................................................................................................ 5

    1.2.1 OFDMA Basics .................................................................................................................................................. 5 1.2.2 OFDMA Symbol Structure and Sub-Channelization ......................................................................................... 6 1.2.3 Scalable OFDMA............................................................................................................................................... 8 1.2.4 TDD Frame Structure........................................................................................................................................ 9 1.2.5 Other Advanced PHY Layer Features ............................................................................................................. 10

    1.3. MAC LAYER DESCRIPTION .................................................................................................................................... 12 1.3.1 Quality of Service (QoS) Support..................................................................................................................... 12 1.3.2 MAC Scheduling Service.................................................................................................................................. 13

    2. SYSTEM MODELING ARCHITECTURE............................................................................................................. 15 2.1 SYSTEM MODELING ASSUMPTIONS ................................................................................................................... 15

    2.1.1 Antenna Pattern ........................................................................................................................................ 15 2.1.2 Antenna Orientation ................................................................................................................................. 15 2.1.3 OFDM performance analysis ................................................................................................................... 16 2.1.3.1.2 Equivalent WCDMA Scenario .............................................................................................................. 17

    2.1.3.2 REFERENCE OFDM CONFIGURATION FOR THE EVALUATION......................................................................... 17 2.1.3.3 PERFORMANCE ANALYSIS RESULTS .............................................................................................................. 18 2.2 FREQUENCY RE-USE AND INTER-CELL INTERFERENCE....................................................................................... 18

    2.2.1 Frequency Re-use ..................................................................................................................................... 18 2.2.2 Inter-cell Interference ............................................................................................................................... 19

    2.3 CHANNEL MODELS AND INTERFERENCE............................................................................................................ 19 2.3.1 Channel Models ........................................................................................................................................ 19

    2.4 COMMON SYSTEM LEVEL MODELING ASSUMPTIONS ........................................................................................ 21 2.5 PERFORMANCE METRICS ................................................................................................................................... 22

    2.5.1 Output Metrics .......................................................................................................................................... 23 3 APPLICATION TRAFFIC MODELS.................................................................................................................. 24

    3.1 HTTP Traffic Model Characteristics ............................................................................................................ 24 3.2 FTP Traffic Model Characteristics............................................................................................................... 26 3.3 NRTV (Near Real Time Video) Traffic Model Characteristics ..................................................................... 27

    4. PROTOCOL LAYER MODULES ........................................................................................................................... 28

    5. MAC LAYER ABSTRACTION................................................................................................................................ 28

    6. PHY MODEM ABSTRACTION FOR SYSTEM MODEL.................................................................................... 28 6.1 REFERENCE SYSTEM SCENARIO FOR HIGH SPEED DATA SERVICES CAPACITY EVALUATION............................ 28

    6.1.1 OFDM Downlink ...................................................................................................................................... 28 6.2 REFERENCE OFDM CONFIGURATION FOR THE EVALUATION............................................................................. 28 6.3 FREQUENCY RE-USE AND INTER-CELL INTERFERENCE....................................................................................... 29

    6.3.1 Frequency Re-use ..................................................................................................................................... 29 6.3.2 Inter-cell Interference ............................................................................................................................... 29

    7 CHANNEL MODELS AND INTERFERENCE FOR SYSTEM MODEL ....................................................... 30 7.1 Channel Models ............................................................................................................................................ 30

    ANNEX A: CHANNEL MODELS FOR SYSTEM MODELING.............................................................................. 31 A.1 SPECIAL CHANNEL MODELS TERMINOLOGY .......................................................................................................... 31 A.2 FOCUS AREAS FOR SYSTEM LEVEL EVALUATION.................................................................................................... 31 A.3 LINK LEVEL CHANNEL MODELS FOR CALIBRATION PURPOSES .............................................................................. 31

    A.3.1 Link Level Channel Model Parameter Summary............................................................................................. 31 A.3.2 Spatial Parameters per Path ........................................................................................................................... 33

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    V0.0.1 Created on 7/6/2006 1:02 PM3WiMAX System Level Simulation

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    A.3.3 BS and MS Array Topologies .......................................................................................................................... 33 A.3.4 Spatial Parameters for the BS ......................................................................................................................... 33 A.3.5 Spatial Parameters for the MS ........................................................................................................................ 36 A.3.6 Calibration and Reference Values................................................................................................................... 38

    A.4 SYSTEM LEVEL SPATIAL CHANNEL MODEL ........................................................................................................... 38 A.4.1 General definitions , parameters, and assumptions ........................................................................................ 39 A.4.2 Environments................................................................................................................................................... 40 A.4.3 Generating User Parameters .......................................................................................................................... 42 A.4.4 Generating channel coefficients ...................................................................................................................... 46 A.4.5 Optional system simulation features................................................................................................................ 47

    A.5 CORRELATION BETWEEN CHANNEL PARAMETERS ................................................................................................. 51 A.6 MODELING INTERCELL INTERFERENCE ................................................................................................................... 52

    A.6.1 System Level Calibration................................................................................................................................. 53 A.6.2 MMSE

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