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Energy efficiency is one of the most important issues to be tackled in wireless sensor networks. Activity scheduling protocols aim at prolonging the network lifetime by reducing the proportion of nodes that participate in the application. Among the vast range of criteria existing to schedule nodes activities, area coverage by connected sets is one of the most studied. Active nodes must ensure area coverage while remaining connected in order to guarantee proper data collection to the sink stations. As wireless communications stand for the main source of energy consumption, the authors investigated the communication redundancy of the active nodes set. They define a path diversity based metric that allows characterizing the communication redundancy of a given set of nodes.
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