  Supporting quality of service (QoS) guarantees for diverse multimedia
services are the primary concerns for WiMAX (IEEE 802.16) networks. A
scheduling scheme that satisfies QoS requirements has become more important for
wireless communications. We propose a downlink scheduling scheme called
adaptive priority-based downlink scheduling (APDS) for providing QoS guarantees
in IEEE 802.16 networks. APDS comprises two major components: priority
assignment and resource allocation. Different service-type connections
primarily depend on their QoS requirements to adjust priority assignments and
dispatch bandwidth resources dynamically. We consider both starvation avoidance
and resource management. Simulation results show that our APDS methodology
outperforms the representative scheduling approaches in QoS satisfaction and
maintains fairness in starvation prevention.
