基于传感网的无线监护系统中MAC层协议的研究

Research of Wireless Sensor Network's MAC Protocol in Wireless Monitoring System

目的:针对无线监护系统的特点,寻找一种适合应用的无线传感器网络MAC层协议。方法:通过分析无线局域网协议802.11中PCF机制,根据无线监护系统的特点对其提出一些改进。结果:通过动态地改变PCF机制中超帧的长度,从而使节点在保证通讯质量的前提下减少了侦听时间,延长了寿命。结论:实验表明该方法可以有效地提高网络的容量,减少时延,节省能量。

Objective To bring out a MAC protocol for the wireless physical signal detection system. Methods This paper studied the PCF mode in the 802.11 protocol, and gives some advices for future work according to the wireless monitoring system＇s character. Results The node in the system can reduce interception time, save energy and prolong life by using dynamic length superframe. Conclusion The result of the experiment shows that the system using the new protocol can improve the network capacity, reduce delay, and save energy.