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Mobile Ad-hoc Networks (MANETs) involve the establishment of wireless connections between mobile nodes, and can dynamically extend the coverage area of wireless local area networks (LAN). For MANETs that use a single channel, the communication performance decreases due to interferences between nodes when frames are being relayed. In this paper, we propose a priority control scheme based on neighbor node behavior for MANETs. A node continuously monitors neighbor nodes and determines a transmission priority on its own using monitoring results; the priority decreases when the node transmits a frame successfully, and increases when the node detects a transmitted frame from neighbor nodes. We evaluated the effectiveness of our proposed scheme using simulations, and results show that the throughput of our proposed scheme is at least approximately 700 kb/s higher than that of a MANET that uses IEEE 802.11a.