WiMAX Air Interface

Subject: 4G WiMAX
Category: Radio
Duration: 3 days

Course outline:

Introduction to WiMAX

● WiMAX network architecture
● Nodes and domains: MS, BS, ASN-GW, ASN, CSN
● Interfaces: R1, R8, R6, R4, R3, R2
● ASN Profiles
● WiMAX bandwidths and bit rates
● Summary of radio access techniques used in WiMAX air interface

Overview of OFDM and OFDMA

● Fundamentals of multipath propagation (selectivity in time, frequency and space)
● Basics of OFDM transmission, subcarriers, cyclic prefix, IFFT/FFT processing
● OFDMA as an extension of OFDM
● Multiple access with OFDMA
● Advantages and disadvantages of OFDM and OFDMA

WiMAX Air Interface Protocol Structure

● WiMAX air interface protocol stack
● Control information and user data organization
● Information mapping: bursts, sub-channels and slots


● RF channel definitions
● MS and BS transmitter power parameters
● PHY interface options: WirelessMAN-SC, WirelessMANSCa, WirelessMAN-OFDM, WirelessMAN-OFDMA, WirelessHUMAN
● OFDMA parameters for WirelessMAN-OFDMA
● TDD and FDD radio frame organizations
● Radio frame elements (sub-frames, sub-channels, slots, data regions, bursts, TTG, RTG)
● Channels and signals (preambles, DL-MAP, UL-MAP, DCD, UCD, FCH, Ranging, fast feedback channel)
● Subcarrier allocation schemes and pilot assignment
● Pseudo random permutations: FUSC, PUSC and Optional PUSC
● Adaptive permutation: Adaptive Modulation and Coding (AMC)
● MIMO scenarios in WiMAX for downlink and uplink
● Adaptive MIMO switch
● Space-Time Coding and Spatial Multiplexing
● Beamforming
● Uplink Collaborative MIMO
● MIMO allocations in the frame
● Downlink and uplink processing chain including channel coding, modulation, subcarrier mapping, Space-Time Coding and OFDMA signal generation

WiMAX PHY Layer Demo and Experiments (tool-based)

● OFDMA waveforms
● Chosen BS and MS signals and PHY channels shown in the time and frequency domain
● Complete downlink and uplink radio frame shown as time-frequency grid


● MAC overall architecture and functions
● MAC sub-layers: Security, Common Part, Convergence
● Logical connections, service flows and QoS
● Link adaptation mechanism, Adaptive Modulation and Coding
● MAC security processing
● Power saving
● MAC packet processing
● Hybrid ARQ
● Timing Relationship and Timing Advance

WiMAX Radio Interface Procedures

● Synchronization
● Cell selection, reselection
● System info acquisition
● Ranging procedure and allocations
● Initial and periodic ranging
● Handover ranging
● Bandwidth request
● Power control for uplink and downlink, closed loop and open loop
● Measurements and reporting
● RSSI, CINR, relative delay, round trip delay
● WiMAX reporting events

WiMAX Deployment

● Planning for coverage and capacity
● Site sharing options
● Tools used in the planning process
● Self-organizing networks (SON) concept

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