Frame-Based Adaptive Uplink Scheduling Algorithm in OFDMA-Based WiMAX Networks

In this paper, we consider an uplink multiservice networks employing Orthogonal Frequency Division Multiple Access (OFDMA) for WiMAX networks. Since the OFDMA physical resource available for scheduling is frame by frame, the uplink scheduler located at base station (BS) must efficiently allocate available resources to the subscriber stations (SSs) in response to constant or bursty data traffic on a per-frame basis. In general, voice and video packets are generated periodically with fixed size packets (i.e. UGS) or periodic variable sizes packets due to coding technologies. Therefore, we propose an uplink scheduling strategy jointing bandwidth allocation and excess bandwidth compensation considering both short-term and long-term periods. Besides, this strategy grants the available resource for real-time and non-real-time traffics, called Frame-based Adaptive Bandwidth Allocation (FBABA) and Minimum Guarantee and Weight-based Bandwidth Allocation (MGWBA), respectively. Simulation results show our algorithm achieves QoS guaranteed, efficient resource allocation and high system throughput.