Capacity Utilization and Admission Control in 802.16e WiMAX

As the network operators are expected to offer plenty of services, users in the network will have varied QoS needs. The unpredictable nature of the network and the exponential growth in traffics, there is a need for intelligent Call Admission Control (CAC) technique that simultaneously manages traffic and bandwidth. In this paper an efficient CAC scheme for mobile WiMAX that satisfies bandwidth and QoS requirements have been proposed. The bandwidth partition approach is undertaken in which the bandwidth is partitioned as constant bit rate for UGS, variable bit rate for rtps and nrtps, handover for handover traffics and shared for all traffics. Simulation is done to evaluate and compare the performance of scheme. The features of this scheme allow reduction in call dropping and blocking probability of connections and improvement in the bandwidth utilization of system.