摘要： 无线传感器网络数据链路层协议难以预测数据汇聚链路,且未引用预编码机制,导致其存在严重传输抖动。为此,提出一种新的无线传感网MAC优化算法。结合链路探测时间及网络链路接收信号强度指示器值的方式构建瞬时搜寻窗口,通过该瞬时搜寻窗口对当前网络链路状况进行匹配及评估分组投递情况,从而提高其对突发链路波动异常的反馈速度。基于评估链路稳定性,定义数据传输规则,采取自适应匹配实现在瞬时搜寻窗口内的数据稳定传输。引入网络预编码,改善网络节点及链路的利用效率,优化数据传输流程,有效增加数据链路节点的编码机会,以减缓网络中的流量峰值对中继节点的影响,实现网络数据在MAC层中的高效稳定传输。测试结果表明,与MAC算法进行对比,该算法具有较高的单位时间数据吞吐率,且拥塞节点数量更少,数据分组投递延时水平更低。

关键词: 无线传感器网络, 数据链路层协议, 传输抖动判断, 预编码, 瞬时搜寻窗口, 链路评估

Abstract: In order to solve the difficulty to predict data aggregation link and the serious transmission jitter problem induced by ignoring the precoding mechanism in the data link layer protocol of Wireless Sensor Network (WSN),this paper presents a new data link optimization protocol of wireless sensor network.First,a search window is constructed by Link detection time and Network link received signal strength indicator value,then the matching and evaluate packet delivery conditions of current network link status are done through the instant search window to improve the feedback speed of the abnormal burst,then data transmission rules are defined based on the evaluation of link stability to achieve stable data transmission in instantaneous search window.Then the network precoding is introduced to improve the utilization efficiency of network nodes and links for optimizing the data transfer process and increasing the data link node encoding opportunities so as to mitigate the peak flow in the network of relay nodes and achieve efficient and stable data transmission in the MAC layer.Test results show that this algorithm has higher data throughput rate per unit time,less number of congestion nodes,and lower data packet delivery delay compared with MAC algorithm.

Key words: Wireless Sensor Network(WSN), data link layer protocol, transmission jitter judgment, precoding, instant search window, link evaluation

中图分类号: 

• TP393