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In wireless ad hoc and sensor networks, the best way for a node to spare energy is to sleep. In this paper, we propose SERENA, a solution to allow router nodes to sleep in such a way that the basic network functionality, i.e. end-to-end communication, is always ensured. SERENA is based on distributed and localized two-hop coloring. The node's color is then mapped in time slots. Each node is ensured...
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