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In wireless sensor networks, multi-path routing is used to alleviate reliability degradation due to multi-hop transmissions over error-prone wireless channels. However, multi-path routing is not energy-efficient, as it requires all the nodes in the network to always be awake. To prolong the network lifetime while maintaining a certain reliability performance, the authors propose Sleeping Multi-path Routing, which selects the minimum number of disjoint paths to achieve a given reliability requirement and puts the rest of the network to sleep. Simulation results show that Sleeping Multi-path Routing can significantly extend the network lifetime, and it can trade off reliability for lifetime.
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