WEDF - Distance Aware Scheduler for Real-Time Applications in Wimax

Scheduling is an important factor for the performance of Wimax system, especially for real-time applications. Earliest Deadline First (EDF) is a delay-optimal scheduling discipline commonly used in real-time applications in wired and wireless networks. Traditional schedulers like EDF do not take the packet destination distance into account. In this paper, we present a scheme that differentiates real-time packets according to their destination distance and assigns them to the dedicated queues which are long distance, middle distance and short distance queues. To the best of our knowledge none of the existing schedulers take destination into account. The proposed scheduler called Weighted Earliest Deadline First (WEDF) gives more precedence to long distance packets than short distance packets. The preliminary simulation results are promising.