Hybrid Resource Allocation and Scheduling Technique for WiMAX Networks

In 802.16 WiMAX networks, both persistent and dynamic resource allocation schemes have their own pitfalls. Hence designing an efficient resource allocation scheme becomes a crucial task. Considering the pit falls of both these resource allocation techniques, in this paper, we employ a hybrid resource allocation (HRA) and scheduling algorithm for WiMAX networks. Persistent allocation is used for UGS service based on delay and queue waiting time and dynamic allocation and scheduling is used for rtPS and nrtPS services, considering minimum bandwidth requirement and channel quality. Based on feedback information from SS, resource utilization level can be estimated and retransmission of lost frames can be scheduled. Simulation results show that the proposed hybrid technique yields 71% increase in capacity, 43% reduction in delay, 74% reduction in packet drop and 5% reduction in MAP overhead when compared to the persistent technique, when the number of user is increased. Similarly it yields 46% increase in capacity, 36% delay reduction, 59% packet drop reduction and 15% MAP overhead reduction when compared to the dynamic allocation technique

کلیدواژه ها:

WiMAX ، Hybrid resource allocation ، Persistent Resource Allocation with Adaptive Dropping (PRA-AD) algorithm ، MAP overhead