An analytical model for service differentiation in IEEE 802.11
Ye Ge, J.C. Hou · 2004
With the rapid deployment of wireless LAN technology, provisioning of QoS differentiation to different traffic classes in wireless LANs (WLANs) has become a prominent research issue. In this paper, we analyze throughput performance of a p-persistent version of 802.11 MAC protocol with multiple QoS traffic classes. (It has been validated in [F. Cali, et al., March 1998], [F. Cali, et al., December 2000], [F. Cali, et al., September 2000] that the transmission probability used in the p-persistent version of 802.11 can be "converted" to the retransmission backoff timer value in 802.11.) In particular, we derive the closed-form solution of throughput with respect to different traffic classes. With the derived analytical results, each station can fine tune its transmission probabilities for different traffic classes to achieve the targeted throughput ratio, while at the same time maximizing the total system capacity. The correctness of the analytical results is corroborated by simulation.