ABSTRACT
This chapter provides a general overview of Channel Allocation using OFDMA technique in Worldwide Interoperability for Microwave Access (WiMAX) system. To analyze the traffic class queue model, the conventional Markov model is implemented. The chapter lays the foundation for discussions to select suboptimal subcarriers and processes the operations of Modulation and Coding Scheme based on channel quality information. WiMAX provides higher transmission rates and mobility when mobile users change dynamically. The system channel quality varies according to the Carrier to Interference and Noise Ratio (CINR). Subcarrier permutation is responsible for reducing the average interference and providing a subcarrier allocation mechanism. The Channel Quality Indicator value was evaluated at the medium access control layer by using CINR reports during frame time, which lead to a flexible priority scheduling algorithm that guarantees throughput for five class traffic services. The polling-based bandwidth request is focused on how to effectively allocate bandwidth to various traffic classes.
