New selection strategies of actor’s substitute in DARA for connectivity restoration in WSANs

Abstract

Wireless Sensor and Actor Networks are used in many dangerous applications. When performing their tasks, actors may fail due to harsh environments in which they are deployed. Some actors are cutvertices within network. Their loss breaks its connectivity and disrupts its operation accordingly. Therefore, restoring network connectivity is crucial. DARA is among the most popular connectivity restoration schemes. It performs multi-actor relocations in order to replace a failed cut-vertex by one of its neighbors, based on the lowest degree. In this paper, we propose new selection strategies of actor’s substitute in DARA, in which the substitute selection is based on the nature of the links with neighbors rather than on the degree. Our approaches improve the performance of DARA by reducing the number of relocated actors in the recovery process by 24% on average compared to its original selection strategy. The proposed strategies are validated through simulation experiments.