An Enhanced Scheduling Scheme for QoS in Mobile WiMAX Networks
The Worldwide interoperability for Microwave Access (WiMAX) standard, that is, the IEEE 802.16e standard supports Point-to-MultiPoint (PMP). Scheduling in WiMAX become one of the most challenging issues, since it is responsible for distributing available resources among users to meet the QoS criteria such as delay, delay jitter, fairness and throughput requirements. However, no specific scheduling mechanism has been defined to provide QoS (Quality-of-Service) through five kinds of service class differentiation. In this paper, the authors propose a novel priority based scheduling scheme to support various services by considering the QoS constraints of each class. The simulation results show the average throughput, average per user throughput, fairness index, average end to end delay and average delay jitter with different loads and different speeds. From these results it is concluded that the proposed scheme provides QoS support for each class efficiently for mobile WiMAX.