On Energy-optimal Cooperation Strategy in Cognitive Radio Networks
نویسندگان
چکیده
Taking into account the overall energy consumption during consecutive processes of opportunistic spectrum access in cognitive radio networks, including sensing locally, reporting sensing results and transmitting data, etc., an energy efficient cooperation strategy is investigated in this paper. First, we formulate the energy-efficient cooperation problem for two special scenarios with SUs in different distribution ranges. By determining how many SUs to cooperate and which SUs to cooperate in the spectrum sensing, the overall sensing and transmitting energy is minimized. Based on the theoretic analysis, a low-complexity heuristic algorithm is proposed to find the most appropriate set of cooperative SUs corresponding to the minimal energy consumption. The simulation results show that the proposed algorithm can achieve a near-optimal performance.
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