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Energy minimization in wireless sensor networks is a key issue, particularly in order to maximize the lifetime of non-serviceable battery powered devices in the field. In this paper, the authors propose a new energy consumption model that allows allocation of variable transmit power and data compression/transmission rate to each sensor node. In contrast to previous work, their model captures both the cost of wireless transmission as well as the cost for a node to be in an active mode during transmission. This is an important and non-trivial consideration, as higher data rates require greater transmit power for reliable wireless transmission, however this reduces the duration for which the node must be in active mode.
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