摘要
WSN网络负载具有周期性和突发性,SMAC协议因固定占空比导致网络时延和能量浪费严重.为此,建立时延和能耗模型,提出从传感器节点缓存区队列长度和其增长速率与信道带宽比值两方面判断网络负载情况,据此动态调整SMAC中的占空比,并改进SYNC帧格式和同步分组广播方法.通过NS2仿真实验表明:相对原SMAC协议,改进的协议网络时延更平稳、时延更小,特别在网络负载较重时时延小得多;在能量效率方面,单位焦耳能量能传送的数据量比SMAC多28%.
The wireless sensor network traffic load is periodic and suddenness. There is a serious problem of network latency and energy wastage in SMAC protocol due to the fixed duty cycle. To solve the problem, this paper established two models of network laten- cy and energy consumption, and proposed the estimation of the network traffic load in two aspects, of which the one was length of the queue in the buffer, anther was ratio of growth rate of the queue and the channel bandwidth. It also designed an algorithm of dynamic adjusting duty cycle in SMAC according to the estimation, and improved the SYNC frame and the method of synchronous packet broad- casting. Simulation experiments with NS2 show that the latency of the improved SMAC protocol is more smooth and less than the origi- nal SMAC, and in aspect of energy efficiency, with the consumption of the unit of joule energy, the amount of data transmitted is 28% more than original SMAC.
出处
《赣南师范学院学报》
2015年第3期6-10,共5页
Journal of Gannan Teachers' College(Social Science(2))
