计算机工程与应用 ›› 2009, Vol. 45 ›› Issue (7): 108-110.DOI: 10.3778/j.issn.1002-8331.2009.07.034

• 网络、通信、安全 • 上一篇    下一篇

非时隙CSMA/CA性能分析与研究

黄 仁,郜 辉,任军华   

  1. 重庆大学 计算机学院 计算机系,重庆 400030
  • 收稿日期:2008-01-17 修回日期:2008-03-31 出版日期:2009-03-01 发布日期:2009-03-01
  • 通讯作者: 黄 仁

Analysis and research of unslotted CSMA/CA for IEEE802.15.4

HUANG Ren,GAO Hui,REN Jun-hua   

  1. Department of Applied Computer Science and Technology,College of Computer Science,Chongqing University,Chongqing 400030,China
  • Received:2008-01-17 Revised:2008-03-31 Online:2009-03-01 Published:2009-03-01
  • Contact: HUANG Ren

摘要: 通过对基于IEEE802.15.4的无线传感网络的非时隙CSMA/CA的算法进行分析,建立了适合于大部分无线传感网络实际应用的具有单步转移概率分布的离散马尔可夫链模型。并给出了在该模型下数据包延时、退避次数两个主要的网络性能评价指标的计算公式。最后通过仿真实验分析了CSMA/CA 算法的三个网络参数对系统性能的影响。

关键词: 非时隙CSMA/CA, 无线传感网络, 马尔可夫链

Abstract: On the analysis of the unslotted CSMA/CA of WSN by IEEE802.15.4,this paper establishes a distributed Markov chain model,which is of one-step transition probabilities and suitable for most WSN application.Moreover,this paper puts forward the calculation formula under this model for two main net property indexes,packet delay,and number of backoff.Finally,the influence of three net parameters of CSMA/CA algorithm on system property is analyzed by emulation experiments.

Key words: unslotted CSMA/CA, WSN, Markov chain