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OAR: an opportunistic auto-rate media access protocol for ad hoc networks

Published: 01 January 2005 Publication History

Abstract

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.

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Information

Published In

cover image Wireless Networks
Wireless Networks  Volume 11, Issue 1-2
January 2005
194 pages

Publisher

Springer-Verlag

Berlin, Heidelberg

Publication History

Published: 01 January 2005

Author Tags

  1. distributed
  2. media access
  3. multi-rate IEEE 802.11
  4. opportunistic
  5. scheduling

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  • (2016)Routing, power control and rate adaptationComputer Networks: The International Journal of Computer and Telecommunications Networking10.1016/j.comnet.2016.03.001102:C(20-37)Online publication date: 19-Jun-2016
  • (2015)Data rate, path length and network contention trade-off in IEEE 802.11s mesh networksComputer Networks: The International Journal of Computer and Telecommunications Networking10.1016/j.comnet.2015.08.02691:C(225-243)Online publication date: 14-Nov-2015
  • (2015)CORHYSComputer Networks: The International Journal of Computer and Telecommunications Networking10.1016/j.comnet.2015.01.01981:C(19-42)Online publication date: 22-Apr-2015
  • (2014)AP Association for Proportional Fairness in Multirate WLANsIEEE/ACM Transactions on Networking10.5555/2591204.259121222:1(191-202)Online publication date: 1-Feb-2014
  • (2014)A link-adapted fragment and rate matching (FaRM) MAC protocol for wireless LANsInternational Journal of Ad Hoc and Ubiquitous Computing10.1504/IJAHUC.2014.06515517:1(1-17)Online publication date: 1-Oct-2014
  • (2012)Relay-aided high-throughput path selection in multi-rate wireless mesh networksProceedings of the 15th ACM international conference on Modeling, analysis and simulation of wireless and mobile systems10.1145/2387238.2387276(223-228)Online publication date: 21-Oct-2012
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  • (2012)Increasing throughput in dense 802.11 networks by automatic rate adaptation improvementWireless Networks10.1007/s11276-011-0389-918:1(95-112)Online publication date: 1-Jan-2012
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