Analysis of channel conditions based on bandwidth and fairness of 802.16 Wi MAX networks

The IEEE 802.16 is a standard for broad band wireless communication in Metropolitan Area Networks. The rate allocation is needed to provide QoS guarantees as well as fairness among the users. Channel error is one of the factors which disrupt the fair allocation of any traffic. In this paper, we propose performance evaluation of Wi-MAX based on band width and fairness, condition based rate allocation method which takes into account the channel error. Our method is operates on two phases; Admission Control Phase and Rate Control Phase. In the first phase, we determine the channel condition as good or bad using signal to interference plus noise ratio (SINR) and during admission control we allocate a prioritized admission control technique to both the channels. In case of a buffer overflow, we determine our approach of earliest deadline technique, to deviate the traffic through lower priority channels. In the second phase, we develop a predictive rate control technique, using queue length and bandwidth requirement information. Thus the value of predictive rate control helps the base station to predict the future traffic load and adjust the rate based on it. By simulation results, we show that our proposed scheme attains better throughput and fairness with reduced delay.