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The authors consider sensor networks where energy is a limited resource so that energy consumption must be minimized while satisfying given throughput requirements. Moreover, energy consumption must take into account both the transmission energy and the circuit processing energy for short-range communications. In this context, they analyze the energy-efficient joint routing, scheduling, and link adaptation strategies that maximize the network lifetime and they emphasize that the energy efficiency must be supported across all layers of the protocol stack through a cross-layer design. They start with the joint MAC and link layer optimization, and then extend the model to include routing optimization.
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