An Efficient Bandwidth and Delay Guaranteed Call Admission Control Scheme for IEEE 802.16d Networks

An efficient Call Admission Control (CAC) scheme for Quality of Service (QoS) provisioning in IEEE 802.16d Fixed WiMAX, that satisfies both bandwidth and delay guarantees to the admitted connections has been proposed in this paper. In our CAC, UGS connections are given higher priority because UGS is the most common service used by the people for communication in everyday life. Bandwidth Degradation is also used to improve the performance of the system. An analytical model based on the Markov Chain was developed to evaluate the performance of the CAC scheme. The proposed CAC scheme is compared with two other existing CAC schemes available in literatures. Numerical results show that the proposed CAC scheme is a good choice for admission control in terms of blocking and dropping probabilities of the connections and bandwidth utilization of the system.