Block Scheduling for Low-Rate, Real-Time Traffic in the Downlink Mobile WiMAX System

We propose a block scheduling (BLS) scheme which can significantly reduce signaling overhead to accommodate more users with low-rate, real-time traffic. The basic concept of the BLS scheme is to allocate the resource to each user by using resource blocks which are a basic unit of resource allocation. Since the performance of the BLS scheme depends on traffic models, we consider two types of traffic: 1) VoIP traffic - nearly constant packet size; 2) game traffic - variable packet size. We present an optimization problem to select the size of resource blocks to minimize the average resource usage per user. Simulation results show that our proposed scheme outperforms the dynamic scheduling (DS).