International Conference on Mechanical Engineering and Technology (ICMET-London 2011)
125 Analysis for WiMAX Uplink Scheduling Algorithms and Proposing the MTD Uplink Scheduling Algorithm
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Uplink (UL) Scheduling in WiMAX is of great importance due to its effect in satisfying QoS constraints for different IEEE 802.16 classes. This paper focuses on analysing the performance of the real time Polling Service (rtPS) QoS class subscribers based on using different UL scheduling algorithms. We propose an UL scheduling algorithm called the Minimum Transmission Duration (MTD) that mainly grants scheduling opportunities to Subscriber Stations (SSs) based on the calculated number of OFDM symbols needed for transmitting the requested packets in the UL direction. A well designed scheduling algorithm should carefully deal with throughput maximization, delay constraints satisfaction and maintaining fairness in distributing the resources among subscribers specifically when dealing with real-time packets which have very critical delay constraints and a minimum throughput requirement. The proposed algorithm is analyzed in the paper using an NS-2 simulation model. Simulation results show that the proposed algorithm enhances QoS Satisfaction in the network while maintaining a throughput comparable to approaches that mainly focus on maximizing network throughput.