Review on fault tolerance with minimal topology changes in WSAN

Wireless sensor and actor networks employ actor nodes within the wireless sensor network (WSN) which can process the sensed data and perform certain actions. For best response Inter-actor coordination is required. The employed actors should form and maintain a connected inter-actor network at the times. WSANs often operate in harsh environments where actors can easily fail or may get damaged. This kind of failures can partition the inter-actor network and thus eventually make the network useless. In order to handle such failures, one of the effective recovery methodologies is to autonomously reposition a subset of the sensor nodes to restore the connectivity. Generally the Contemporary recovery schemes either impose high node relocation overhead or extend some of the inter-actor data paths. Here an overview of such kinds of different fault tolerance algorithms is provided.