Adaptive Time-utility Function Scheme for Downlink Packet Scheduling in IEEE 802.16e/WiMAX Networks

WiMAX is a well-known broadband wireless access technology that supports multimedia transmission users. IEEE 802.16e has evolved into five quality of service (QoS) scheduling types for WiMAX uplink transmissions, but downlink transmission types have not yet been defined. To assist in this task, and to support efficient base station packet scheduling that takes QoS into account, I propose an adaptive time-utility function (A-TUF) packet scheduling scheme to improve downlink real-time (RT) traffic QoS and whole system throughput. Simulation results indicate that the proposed scheme is capable of providing lower RT packet delay and loss rate compared to conventional TUF-based algorithms.