Design of a Packet Scheduling Scheme for Downlink Channel in IEEE 802.16 BWA Systems

A packet scheduling scheme in the downlink channel for IEEE 802.16 is proposed.The scheme can be implemented in the base station and is compatible to the MAC protocol of IEEE 802.16. In order incorporate the properties of location-dependent and burst error of wireless channels, we design a novel packet scheduling algorithm named the credit-based algorithm (CBA) to guarantee QoS of both real-time and non-real-time services. Simulation experiments are conducted to evaluate the performance of the proposed scheme. Based on the simulation results, we show the CBA scheme is capable of providing significantly improved system capacity,guaranteeing the packet delay for real-time services, and maintaining fair capacity allocation to non-real-time services.