Performance Analysis of a Dynamic Scheduler for VBR Services in IEEE802.16d Broadband Wireless

In this paper, we propose a QoS guaranteed dynamic scheduler for IEEE 802.16d broadband wireless systems. The dynamic scheduler residing at the base station (BS) dynamically schedules the subscriber stations (SS) based on the present load of the system. The number of slots that has to be allotted to satisfy the QoS requirement of the applications running on each SS is estimated by the BS during each frame. This dynamic scheduler is designed for uplink VBR multimedia services with constraint QoS. An admission controller is also included in the system to avoid the system overload. The performance of the dynamic scheduler at the BS is analyzed with various uplink schedulers at the SS. The simulation is carried out for various scenarios and the system performance is evaluated. The results show that the dynamic scheduler enhances the system performance in terms of throughput and delay