Performance analysis of ieee 802.11a based on modified Markov model in non-saturation conditions

  • Authors:

  • Feng Gao;Zehua Gao;Liu Wen;Yazhou Wang;Jie Liu;Dahsiung Hsu

  • Affiliations:

  • Key Laboratory of IPOC, University of Posts and Telecommunications, Beijing, China;Key Laboratory of IPOC, University of Posts and Telecommunications, Beijing, China and Key Laboratory of UWC, University of Posts and Telecommunications, Beijing, China;Key Laboratory of IPOC, University of Posts and Telecommunications, Beijing, China;Key Laboratory of UWC, University of Posts and Telecommunications, Beijing, China;Key Laboratory of UWC, University of Posts and Telecommunications, Beijing, China;Key Laboratory of IPOC, University of Posts and Telecommunications, Beijing, China

  • Venue:
  • ICICA'10 Proceedings of the First international conference on Information computing and applications
  • Year:
  • 2010

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Abstract

The maximum nominal data rate specified in IEEE 802.11a is up to 54Mbps.However, in practice, we found that the data rate which users could get is much lower than that. In order to accurately estimate the ability of IEEE 802.11a to support data services, we improved the existing two-dimensional Markov chain models of the backoff window scheme, and analyzed the efficiency of the IEEE 802.11a standard for wireless LANs in nonsaturation conditions from the perspective of framing efficiency and medium access control (MAC) layer transport efficiency in this paper. Specifically, we derived an analytical formula for the protocol actual throughput. The results showed that the throughput of non-saturation could exceed the saturated one. To a certain degree of non-saturation, the network throughput can be optimal. And under the condition of different frame length, the performance in RTS/CTS mode is different with that in basic access model which can be measured by a switching threshold we give in the last of the paper.