Performance evaluation of end-to-end delay by hybrid scheduling algorithm for QoS in IEEE 802.16 network

IEEE 802.16 standard supports real time and non-real time services at each node. However, it has flexibility to develop customized scheduling algorithms according to different priority-based traffic´s quality of service (QoS) requirements. Hence, it is imperative to obtain optimum scheduling schemes for different kinds of traffic (i.e., services). Earliest due date (EDD) is one of the highly referred scheduling algorithms for real time communication. In this presentation, our study shows that the proposed hybrid algorithms (EDD along with weighted fair queue (WFQ)) in a node gives better performance for real time services instead of EDD only. Moreover, the results reveal that, scheduling schemes from base station (BS) to subscriber station (SS) like grant per SS (GPSS) impacts less delay than grant per connection (GPC)