Density-based admission control in IEEE802.16e mobile WiMAX

We propose in this work a new state-dependent admission control scheme where the degree of acceptance of flows depends on the density of the users in a given location. The latter refers to different areas in a single OFDMA-based WiMAX cell wherein users are allowed to move internally between those areas as well as externally to other cells. We develop an analytical model which allows us to derive some performance measures such as blocking and dropping probabilities. Our results quantify how these metrics vary with the load as well as the admission strategies. Our density-based admission control algorithm is shown to lower the dropping probability of on-going calls without increasing too much the blocking probability of new ones.