NDLI: IEEE 802.11 rate adaptation: a practical approach

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IEEE 802.11 rate adaptation: a practical approach

Content Provider	ACM Digital Library
Author	Turletti, Thierry Manshaei, Mohammad Hossein Lacage, Mathieu
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.
Starting Page	126
Ending Page	134
Page Count	9
File Format	PDF
ISBN	1581139535
DOI	10.1145/1023663.1023687
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2004-10-04
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Ieee 802.11 Arf Rbar Phy rate selection Madwifi
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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