Admission control with physical rate measurement for IEEE 802.11e controlled channel access

A simple admission control unit has already been developed as a reference for HCF (hybrid coordination function) controlled channel access (HCCA) in a recent 802.11e draft [2]. However, this reference scheme is inefficient because it is implemented based on the minimum physical rate from which the mobile stations' actual physical rates deviate greatly at most of the time. In this letter, we propose a physical rate based admission control scheme (PRBAC) which enhances the reference scheme by taking account of both of the wireless channel characteristics and the stations' mobility. Simulation results show the significant improvement of the proposed admission control scheme.