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栅栏覆盖模型被广泛应用于基于有向传感器网络的入侵检测技术.现有方法大都采用集中调度策略,使得栅栏维护通信量和重组时延不能满足入侵检测实时性要求.本文采用分治策略将覆盖区域剖分,并基于异步唤醒模式对栅栏进行修复.首先,利用节点间周期性通信获取网络拓扑;在每个时间片内生成参与数最少的强栅栏覆盖节点子集合,不同时间片交替唤醒节点集合;最后,采用一个轻量计算方法对栅栏故障进行分布式修复.仿真实验表明,文中提出的方法有效降低强栅栏覆盖维护开销,使得网络生命时间延长1倍,且节点冗余度降低6%.
The fence cover model is widely used in the intrusion detection technology based on the directional sensor network.Most existing methods adopt the centralized scheduling strategy so that the fence maintenance traffic and the reassembly delay can not meet the real-time requirements of intrusion detection.In this paper, The area is segmented and the fence is repaired based on the asynchronous wake-up pattern.Firstly, the network topology is obtained by periodic communication between nodes, and the subset of strong barrier-covered nodes with the least participation number is generated in each time slice, Finally, a lightweight computing method is used to repair the fault of the fence in a distributed manner.The simulation results show that the proposed method can effectively reduce the overhead of the strong fence, which prolongs the lifetime of the network by a factor of 1 and reduces the redundancy of nodes by 6% .