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The rapid development of wireless sensor networks has accelerated tremendous research efforts with an aim to maximize the lifetime of battery-powered sensor nodes and, by extension, the overall network lifetime. The main purpose of sensor networks is to gather information from the physical environments and deliver the same to the required applications. As a matter of fact all work in WSNs can be divided into two equally important threads; efficient routing of sensed data and sleep scheduling that reduces energy cost due to idle listening by providing periodic sleep cycles for sensor nodes. In this paper, the authors present an energy efficient fault tolerant and reliable routing protocol to extend the network life time and maintain the connectivity of the network.
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