Abstract
While the benefits of cooperation of the diversity of research have been in the literature, cooperation MAC protocol design also led to a lot of attention. In a single-relay repeated request (C-ARQ cooperation agreement, had better be to choose a relay node in a distributed attitude, use different time relay bag. However, back to forward this relay selection plan does not work efficiently in a dense network case; with high collision probability in the struggle of relays may different. In this paper, we put forward an optimal choice of, in order to maximize transmission system energy efficiency reduce collision probability. Energy efficiency performance the optimal transitive the established the simulation results verify the options.
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