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Modeling and analysis of slow CW decrease for IEEE 802.11 WLAN

Research output: Contribution in Book/Report/ProceedingsConference contribution

Published

  • Q. Ni
  • I. Aad
  • C. Barakat
  • T. Turletti
Publication date2003
Host publicationPersonal, Indoor and Mobile Radio Communications, 2003. PIMRC 2003. 14th IEEE Proceedings on
PublisherIEEE
Pages1717-1721
Number of pages5
ISBN (Print)0-7803-7822-9
Original languageEnglish

Conference

Conference14th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications
CityBEIJING
Period7/09/0310/09/03

Conference

Conference14th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications
CityBEIJING
Period7/09/0310/09/03

Abstract

The IEEE 802.11 Medium Access Control (MAC) protocol provides a contention-based distributed channel access mechanism for mobile stations to share the wireless medium, which may introduce a lot of collisions in case of overloaded active stations. Slow Contention Window (CW) decrease scheme is a simple and efficient solution for this problem. In this paper, we use an analytical model to compare the slow CW decrease scheme to the IEEE 802.11 MAC protocol. Several parameters are investigated such as the number of stations, the initial CW size, the decrease factor value, the maximum backoff stage and the coexistence with the RequestToSend and ClearToSend (RTS/CTS) mechanism. The results show that the slow CW decrease scheme can efficiently improve the throughput of IEEE 802.11, and that the throughput gain is higher when the decrease factor is larger. Moreover, the initial CW size and maximum backoff stage also affect the performance of slow CW decrease scheme.