Abstract:

We develop a new multiple access protocol ATPMAP(Adaptive Token Passing Multiple Access Protocol with fairness guarantee) for WLAN, to improve the performance of the MAC protocol of IEEE 802. 11 DCF(Distributed Coordination Function). In this protocol, token which lead to the reduction of collisions are used to queue the stations. The token passing parameter p is adjusted adaptively according to the fairness of a newtork. The performance of the protocol is analyzed. The saturation throughput bound of the ATPMAP protocol is given. Simulation results have shown that the proposed scheme can improve the performance of the MAC protocol by providing a higher throughput and a lower loss of fairness.

Key words: WLAN, multiple access, token passing, fairness guarantee