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Fast rate adaptation has been established as an effective way to improve thePHY-layer raw date rate of wireless networks. However, within the current IEEE802.11 legacy, MAC-layer throughput is dominated by users with the lowest datarates, resulting in underutilization of bandwidth. In this paper, we proposeand analyze a novel distributed MAC strategy, referred to as Rate-aware DCF(R-DCF), to leverage the potential of rate adaptation in IEEE 802.11 WLANs. Thekey feature of R-DCF is that by introducing different mini slots according tothe instantaneous channel conditions, only contending stations with the highestdata rate can access the channel. In this way, the R-DCF protocol not onlyexploits multi-user diversity in a fully distributed manner but also reducesthe loss of throughput due to collisions. Through analysis, we develop ananalytical model to derive the throughput of R-DCF in general multi-rate WLANs.Using the analytical model we investigate the performance of R-DCF protocol invarious network settings with different rate adaptation strategies and channelvariations. Based on the analysis, we further derive the maximal throughputachievable by R-DCF. For practical implementation, an offline adaptive backoffmethod is developed to achieve a close-to-optimal performance at low runtimecomplexity. The superiority of R-DCF is proven via extensive analyses andsimulations.

Distributed MAC Strategy for Exploiting Multi-user Diversity in Multi-rate IEEE 802.11 Wireless LANs