WiMAX Forum
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
WiMAX Forum
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
