Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (1): 49-53,58.doi: 10.3969/j.issn.1000-565X.2010.01.010

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Delay Analysis of 802.11 DCF Based on G/G/1 Queuing Model

Xie Li-ying  Wang Hong-fiang  Wei Gang   

  1. School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2008-11-24 Revised:1900-01-01 Online:2010-01-25 Published:2010-01-25
  • Contact: 谢丽英（1981-），女，博士生，主要从事AdHoc网络研究． E-mail:xieliying2005@163．com
  • About author:谢丽英（1981-），女，博士生，主要从事AdHoc网络研究．
  • Supported by:

    国家杰出青年科学基金资助项目(60625101)；国家“863”计划项目(2007AA01Z210)；广东省自然科学基金资助
    项目(07006488)

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Abstract:

As the existing models analyzing the back-off scheme in 802. 11 DCF can not effectively consider the neighbor nodes, this paper proposes a new approach to the performance analysis of unsaturated 802.11 DCF protocol, deduces the formulae of the MAC （Medium Access Control） layer delay and its delay in unsaturated single-hop 802.11 DCF network, and analyzes the effects of packet arrival rate, node number and collision window size on the MAC-layer transmission collision probability, the delay and the delay jitter. Simulated results indicate that the transmission collision probability, the delay and the delay jitter all increase with the packet arrival rate and the node number, and that the delay and the delay jitter both decrease with the minimum collision window size of DCF, following by an increase in the transmission collision probability.

Key words: queuing network, Distributed Coordination Function, delay, delay jitter