An Advanced uplink scheduling at Subscriber Station for real time services in WiMAX

High mobility and need for data access with high speed, brings the Broadband Wireless Access (BWA) like WiMAX in forefront. IEEE Standard does not offer any standard scheduling algorithm and till now, it is an open issue for research. The objectives of the scheduling are resource optimization with high throughput and low computational complexity. In this paper, we propose a scheduling algorithm based on a virtual frame concept for the Subscriber Stations (SSs) of the WiMAX. Simulations are performed in Network Simulator 2 (NS2) for verification of the proposed scheme. The simulation results show that by using the proposed Advanced Scheduler (AS) approach the response time to BS decreased to 16.02% in comparison to queue length aware approach. The proposed approach optimizes the usage of the bandwidth and resources in the WiMAX networks by including intelligence for different service flows at the SSs. Moreover, it does fair management of lower class services such as nonreal time Polling Service (nrtPS) and Best Effort (BE) in comparison to Unsolicited Grant Service (UGS) and real time Polling Service (rtPS).