As the sensor nodes have quite limited battery capacity and their energies are not renewable, the barrier hole appears once one node in the barrier runs out of its energy. Barrier hole repairing is necessary to effectively extend the lifetime of barrier coverage in directional sensor networks (DSNs). This article studies the design of effective barrier-hole-repairing scheme for DSNs. Specifically, it first presents the important concept of the repairing region (RepR), inside which the mobile nodes located can repair the hole only by rotating their sensing directions. Then it analyzes the movement and rotation energy consumption of different types of candidate repairing nodes which are not in the barrier. Finally, based on the above analysis, it proposes an effective scheme to schedule an optimal node to repair the barrier hole with the minimum energy consumption, fully exploiting residual resources (unused nodes and power) to increase network service time. Simulation results show that, compared to other barrier-hole-repairing schemes, our scheme could greatly prolong the lifetime of barrier coverage.

中文翻译：

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定向传感器网络中基于修复的节能栅寿命延长方案

由于传感器节点的电池容量非常有限，并且它们的能量不可再生，因此一旦屏障中的一个节点能量耗尽，就会出现屏障孔。屏障孔修复对于有效延长定向传感器网络（DSN）中屏障覆盖范围的寿命是必需的。本文研究了DSN的有效障壁修复方案的设计。具体而言，它首先介绍了修复区域（RepR）的重要概念，位于内部的移动节点仅通过旋转其感应方向即可修复孔。然后分析了不在障碍物中的不同类型的候选修复节点的运动和旋转能耗。最后，根据以上分析，它提出了一种有效的方案，以最小的能量消耗来调度最佳节点来修复障碍孔，充分利用剩余资源（未使用的节点和功率）以增加网络服务时间。仿真结果表明，与其他阻隔孔修复方案相比，我们的方案可以大大延长阻隔层的使用寿命。