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In this paper the authors present an energy-efficient cross layer protocol for providing application specific reservations in wireless senor networks called the "Unified Clustering and Communication Protocol" (UCCP). The modular cross layered framework satisfies three wireless sensor network requirements, namely, the QoS requirement of heterogeneous applications, energy aware clustering and data forwarding by relay sensor nodes. The unified design approach is motivated by providing an integrated and viable solution for self organization and end-to-end communication is wireless sensor networks. Dynamic QoS based reservation guarantees are provided using a reservation-based TDMA approach. The novel energy-efficient clustering approach employs a multi-objective optimization technique based on OR (operations research) practices.
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