Contention window optimization for ieee 802.11 DCF access control

Der Jiunn Deng, Chih Heng Ke, Hsiao Hwa Chen, Yueh Min Huang

Research output: Contribution to journalArticlepeer-review

133 Citations (Scopus)


According to the latest version of the IEEE 802.11 standard, the backoff parameters of its collision avoidance mechanism are far from optimal, especially in a heavy load or error-prone WLAN environment. This strategy has a high collision probability and channel utilization is degraded in bursty arrivals or congested scenarios. Besides, the standard backoff mechanism may treat noise corruption as packet collisions. In this paper, we identify the relationship between backoff parameters, contention level, and channel BER in order to propose a simple, but yet well-performing distributed algorithm that allows a station to dynamically adjust its contention window size based on turn-around-time measurement of channel status. In addition to theoretical analysis, simulations are conducted to evaluate its performance. The proposed scheme works very well in providing a substantial performance improvement in heavy loaded and error-prone WLAN environments.

Original languageEnglish
Article number4712731
Pages (from-to)5129-5135
Number of pages7
JournalIEEE Transactions on Wireless Communications
Issue number12
Publication statusPublished - 2008 Dec 1

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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