基于流量的自适应退避算法

通过对SMAC协议仿真分析，得到节点队列长度与网络流量以及占空比［3］之间的关系，并对此关系进行理论分析，在理论验证的基础上，针对SMAC协议固定竞争窗口的缺陷提出了一种基于流量的自适应退避算法，根据流量变化改变竞争窗口的大小，从而缓解网络流量高时激烈的信道竞争，减小网络流量低时空闲侦听时间，信道利用率显著提高。并通过NS2.35［10］仿真平台进行验证分析，结果表明在网络延迟、能耗和吞吐量等方面优于采用随机退避机制的SMAC协议［5］。

Adaptive backoff algorithm based on traffic

This paper presents the design, analysis and performance evaluation of a algorithm, called Adaptive backoff mechanism. This algorithm is based on the relationship of length of queue and network traffic and the duty cycle. The basic idea of this algorithm is changing the size of the contention window according to the flow, thus relieving network traffic in high contention level and reducing the time of overhead in low contention level. Finally, analyzed through the NS2.35. The results showed that it is better than using a random backoff mechanism of SMAC protocol in the network delay, energy consumption and throughput.