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Distributed fair scheduling in a wireless LAN
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A rate-adaptive MAC protocol for multi-Hop wireless networks
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The IEEE 802.11 Handbook: A Designer's Companion
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REACT: Rate Adaptation using Coherence Time in 802.11 WLANs
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Opportunistic packet scheduling over IEEE 802.11 WLAN
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Proceedings of the 15th ACM international conference on Modeling, analysis and simulation of wireless and mobile systems
AP Association for Proportional Fairness in Multirate WLANs
IEEE/ACM Transactions on Networking (TON)
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The IEEE 802.11 wireless media access standard supports multiple data rates at the physical layer. Moreover, various auto rate adaptation mechanisms at the medium access layer have been proposed to utilize this multi-rate capability by automatically adapting the transmission rate to best match the channel conditions. In this paper, we introduce the Opportunistic Auto Rate (OAR) protocol to better exploit durations of high-quality channels conditions. The key mechanism of the OAR protocol is to opportunistically send multiple back-to-back data packets whenever the channel quality is good. As channel coherence times typically exceed multiple packet transmission times for both mobile and non-mobile users, OAR achieves significant throughput gains as compared to state-of-the-art auto-rate adaptation mechanisms. Moreover, over longer time scales, OAR ensures that all nodes are granted channel access for the same time-shares as achieved by single-rate IEEE 802.11. We describe mechanisms to implement OAR on top of any existing auto-rate adaptation scheme in a nearly IEEE 802.11 compliant manner. We also analytically study OAR and characterize the delay jitter and the gains in throughput as a function of the channel conditions. Finally, we perform an extensive set of ns-2 simulations to study the impact of such factors as node velocity, channel conditions, and topology on the throughput of OAR.