基于跟踪链的无线传感器网络移动目标查询

Mobile Target Query in Wireless Sensor Network with Tracking Chain

针对直接查询存在的问题,研究了基于跟踪链的移动目标查询方案。提出了目标跟踪链的概念—由目标移动途经的传感器节点组成的存储着目标时空信息的双向链路;给出了跟踪链的构建方法和基于跟踪链的目标查询过程;理论分析了基于跟踪链的目标查询代价。仿真结果表明,该查询方案与直接查询相比,有效降低了查询跳数和查询失败概率;与基于跟踪树的查询相比,在目标查询频率较低或者目标移动频率较高时表现出能量有效。

Refering to problems of direct query, a tracking-chain based mobile target query scheme is proposed. The tracking chain is firstly defined as a bi-directional chain consisting of the sensor nodes on the target route and reserving the target spatio-temporal information. The method to build the tracking chain and to query the target with the tracking chain is presented. The target query cost based on tracking chain is also analyzed theoretically. The simulated results show that, the proposed scheme has fewer searching hops and lower failure probability than the direct query, and consumes less energy than the tracking-tree based query scheme as the target query frequency is lower or the target movement frequency is higher.