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Short-Term Fairness of 802.11 Networks with Several Hosts

  • Gilles Berger-Sabbatel
  • Andrzej Duda
  • Martin Heusse
  • Franck Rousseau
Part of the IFIP International Federation for Information Processing book series (IFIPAICT, volume 162)

Abstract

Previously, we have analyzed the short-term fairness of the 802.11 DCF (Distributed Coordination Function) access method in the case of a network with two hosts. In this paper we extend the analysis to an increased number of hosts. We use two fairness indices. The first one is the number of inter-transmissions that other hosts may perform between two transmissions of a given host. The second index is based on the sliding window method that considers the patterns of transmissions and computes the average Jain fairness index in a window of an increasing size. Computed over traces gathered during measurement sessions the indices show that the fairness of 802.11 is pretty good even on the short term time scale. We also evaluate the impact of the short-term fairness on performance by providing the measurements of the delay.

Keywords

Wireless LANs Fairness of 802.11 CSMA/CA Network measurements 

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Copyright information

© International Federation for Information Processing 2005

Authors and Affiliations

  • Gilles Berger-Sabbatel
    • 1
  • Andrzej Duda
    • 1
  • Martin Heusse
    • 1
  • Franck Rousseau
    • 1
  1. 1.LSR-IMAG LaboratoryGrenobleFrance

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