Distributed Backup Scheme for Wireless Sensor Networks Using Delayed Report

In delay-tolerant wireless sensor networks, reporting data from a source node to a sink may be delayed to satisfy certain criterions, for example, high energy-efficiency, low algorithm complexity and so on. Sensed data in such networks accumulate on a sensor node during time delayed. It means that even a single failed node may cause a massive-data loss. This paper proposes a backup scheme to minimize data losses caused by failed nodes in wireless sensor networks using the delayed report. The proposed scheme can safely preserve data and consume less energy by backuping a single data to multiple nodes that exist in the one-hop distance from the source node. Multiple backup nodes do not only store and recover backup data but also distributedly report their backup data to the sink instead of the source node. As a result, the energy consumption for data report is not concentrated to the source node and is distributed to backup nodes. Such approach suggests the new potentiality of a backup scheme in error-scarce network.