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This paper surveys several protocols for energy conservation in wireless sensor networks which preserve a certain degree of coverage and connectivity of the initial network. The idea is to schedule redundant nodes to sleep mode while the active nodes provide continuous monitoring. Thus minimizing the number of active nodes determines the increase of network lifetime. There are two research directions for conserving energy in wireless sensor networks. Early work focused to conserve energy while preserving only coverage or connectivity of the initial network. On the other hand, recent work focused to conserve energy while preserving both coverage and connectivity at the same time.
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