Admission Control for Non-preprovisioned Service Flow in Wireless Metropolitan Area Networks

Improving the admission control process in wireless metropolitan area networks (WMAN) based on the IEEE 802.16e standard can improve the QoS. Because IEEE 802.16e supports five classes of service as well as mobility, an admission control policy for non-preprovisioned service flow is proposed. This policy is compatible with the QoS parameters for each service class defined in the standard. As improvements, the guard channel scheme is used to give handover connections higher priority and a novel proportional bandwidth-borrowing scheme is added to prioritize the different service classes. The simulation results show the proposed admission control policy maximizes the bandwidth utilization and the use of the two schemes provides a reasonable priority order of new originated connections and handover connections of different service classes. The connection-blocking and connection-dropping probabilities were reduced to the extent that they can be ignored