分簇式无线传感器网络汇聚节点移动策略研究

Research on the moving strategy for mobile sink in cluster wireless sensor networks

研究了分簇式无线传感器网络汇聚节点自主移动机制,该机制设定汇聚节点单跳邻居节点集的数据流量发生较大变化时,汇聚节点开始移动.移动的方向为产生主要数据流量的节点集的带权质心方向,移动距离以汇聚节点覆盖最大变化率或节点和汇聚节点距离的数学期望进行限制,使得汇聚节点的移动不会导致当前网络拓扑发生很大变化.仿真实验表明,相比于固定汇聚节点和随机移动汇聚节点,该机制在不同网络规模下都可以更有效地延长网络生存周期,并且节点初始能量越高性能越好.

A autonomous mobile sink mechanism is proposed, which set sink begin to move when the change of data traffic form single-hop neighbor is extremely obvious. The direction of movement is the weighted centroid of those nodes with major traffic data. The distance of movement is limited by the changes of coverage or the mathematical expectation for the distance between nodes and the sink. The limition guarantee that the movement of mobile sink should not make current network topology changing dramatically, The simulation results show that the mechanism extends the network lifetime effectively compared with fixed sink and random movement sink in different network scale. Better performance would be achieved when nodes have more initial energy.