Traffic based QoS Specific Adaptive Buffer Allocation in Wimax Networks

Buffer allocation in WiMAX maximizes the throughput by achieving high link utilizationof system and minimizes the power consumption. In this paper, Traffic Based QoS Specific Adaptive Buffer Allocation in WiMAX networks is proposed to increase the system throughput by using an adaptive buffer allocation strategy. The buffer management block initially allocates buffer to the flow requests based on buffer allocation factor which is computed using fuzzy logic. The allocated buffer is verified periodically by buffer reallocation technique. It computes satisfaction factors for real time and non real time flows. Delay and minimum reserved data rate are considered as a metric for real time flows and for non real time flows respectively. Based on estimated satisfaction factor value, flow rate is adjusted for real time traffic using PID controller and additional buffer is allocated for non real time flows. We evident that our proposed scheme performs efficient adaptive buffer allocation, thereby reducing the transmission delay under heavy traffic condition with QoS features conciliation.