上海交通大学学报

上海交通大学学报（自然版） ›› 2011, Vol. 45 ›› Issue (10): 1521-1525.

• 自动化技术、计算机技术 • 上一篇    下一篇

一种自适应的无线传感网媒体接入控制协议

陈德富，陶正苏，朱建平   

  1. (上海交通大学 仪器科学与工程系， 上海 200240)
  • 收稿日期:2010-10-30 出版日期:2011-10-31 发布日期:2011-10-31
  • 基金资助:

    国家科技支撑计划课题(2006BAK03A17)资助

An Adaptive and Asynchronous MAC Protocol for Wireless Sensor Networks

 CHEN  De-Fu, TAO  Zheng-Su, ZHU  Jian-Ping   

  1. (Department of Instrument Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China)
  • Received:2010-10-30 Online:2011-10-31 Published:2011-10-31

摘要： 为了提升无线传感器网络在动态负载下的性能，提出了一种双阈值流量自适应的异步媒体接入控制(AXMAC)协议.该协议基于前导序列侦听技术，在发送频闪前导序列过程中插入握手机制，使得平均前导序列长度缩短为节点侦听间隔的1/2；同时提出一种双阈值的网络流量判决机制，使得节点能够自适应调整其侦听间隔.建立了基于Markov链的协议模型，并分析了协议阈值对节点调节侦听间隔的影响.仿真结果表明，AXMAC能够显著地减小动态负载下的网络延时；通过选择合适的阈值，能够达到较好的能耗和延时平衡.
 

关键词: 无线传感网络, 前导侦听, 自适应, 媒体接入控制

Abstract: To improve network performance in dynamic traffic condition, an adaptive and asynchronous MAC protocol called AX-MAC was proposed. Based on preamble sampling technique, AX-MAC halves the length of wakeup preamble by employing some early ACK listening periods intercepted into strobed preambles. It also allows nodes to adjust their polling intervals according to the traffic conditions quickly and accurately by employing a two-parameters-based traffic determining mechanism. A model based on Markov chain is set up to analyze the influence of these two parameters. The simulations illustrate that AX-MAC can significantly reduce network latency on dynamic traffic conditions. Moreover, it also provides an optimal energy-latency trade-off by selecting proper parameters couples carefully.

Key words:  wireless sensor networks, preamble sampling, adaptive, media access control (MAC)

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