IEEE 802.11 rate adaptation: A practical approach

Mathieu Lacage, Mohammad Hossein Manshaei, Thierry Turletti

Research output: Chapter in Book/Report/Conference proceedingConference contribution

438 Scopus citations

Abstract

Today, three different physical (PHY) layers for the IEEE 802.11 WLAN are available (802.11a/b/g); they all provide multi-rate capabilities. To achieve a high performance under varying conditions, these devices need to adapt their transmission rate dynamically. While this rate adaptation algorithm is a critical component of their performance, only very few algorithms such as Auto Rate Fallback (ARF) or Receiver Based Auto Rate (RBAR) have been published and the implementation challenges associated with these mechanisms have never been publicly discussed. In this paper, we first present the important characteristics of the 802.11 systems that must be taken into account when such algorithms are designed. Specifically, we emphasize the contrast between low latency and high latency systems, and we give examples of actual chipsets that fall in either of the different categories. We propose an Adaptive ARF (AARF) algorithm for low latency systems that improves upon ARF to provide both short-term and long-term adaptation. The new algorithm has very low complexity while obtaining a performance similar to RBAR, which requires incompatible changes to the 802.11 MAC and PHY protocol. Finally, we present a new rate adaptation algorithm designed for high latency systems that has been implemented and evaluated on an AR5212-based device. Experimentation results show a clear performance improvement over the algorithm previously implemented in the AR5212 driver we used.

Original languageEnglish (US)
Title of host publicationACM MSWiM 2004 - Proceedings of the Seventh ACM Symposium on Modeling, Analysis and Simulation of Wireless and Mobile Systems
EditorsS. Balsamo, C.-F. Chiasserini, L. Donatiello
Pages126-134
Number of pages9
StatePublished - 2004
Externally publishedYes
EventACM MSWiM 2004 - Proceedings of the Seventh ACM Symposium on Modeling, Analysis and Simulation of Wireless and Mobile Systems - Venezia, Italy
Duration: Oct 4 2004Oct 6 2004

Publication series

NameACM MSWiM 2004 - Proceedings of the Seventh ACM Symposium on Modeling, Analysis and Simulation of Wireless and Mobile Systems

Conference

ConferenceACM MSWiM 2004 - Proceedings of the Seventh ACM Symposium on Modeling, Analysis and Simulation of Wireless and Mobile Systems
Country/TerritoryItaly
CityVenezia
Period10/4/0410/6/04

Keywords

  • ARF
  • IEEE 802.11
  • MADWIFI
  • PHY Rate Selection
  • RBAR

ASJC Scopus subject areas

  • Engineering(all)

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