ABSTRACT
In this chapter, we investigate resource management mechanisms in Worldwide Interoperability for Microwave Access (WiMAX) networks, including subcarrier assignment, adaptive power allocation, and call admission control schemes. Subcarrier assignment scheme deals with how to allocate subcarriers to form a subchannel. Adaptive power allocation allows the transmitter to grant diff erent power levels to diff erent subcarriers according to the channel state information. Call admission control highlights how to distribute a subscriber’s access bandwidth over diff erent types of applications such that the quality-of-service (QoS) requirement of each connection is guaranteed. We focus on orthogonal frequency division multiple access (OFDMA) with time division duplex (TDD) environment, which allows high-spectrum utility effi ciency on the uplink and downlink channels in asymmetric “last-mile” Internet access. We conclude this chapter with an optimization strategy that fi nds a balance between the revenue of a WiMAX service provider and the satisfaction of WiMAX subscribers.
