Date Added: Feb 2011
The authors consider surveillance applications in which sensors are deployed in large numbers to improve coverage fidelity. Previous research has studied how to select active sensor covers (subsets of nodes that cover the field) to efficiently exploit redundant node deployment and tolerate unexpected node failures. Little attention was given to studying the tradeoff between fault tolerance and energy efficiency in sensor coverage. In this work, their objectives are twofold. First, they aim at rapidly restoring field coverage under unexpected sensor failures in an energy-efficient manner. Second, they want to flexibly support different degrees of redundancy in the field without needing centralized control.