To address the problems like static nature, unfairness and complexity in Selfish Misbehavior (SM) processing mechanism of Medium Access Control (MAC) protocol of Mobile Ad Hoc NETwork (MANET), an optimization algorithm for SM was proposed. By using optimization theory and feedback theory, the Optimal Access Probability (OAP) was conducted through the utilization of historical samples, realizing the dynamic change of parameters to improve static nature. Then, all nodes in the network were set to use the OAP at the given period, thus the fairness index of the network was promoted. Finally, linear iteration mechanism was adopted to avoid the increase of complexity. On basis of the above, stability and effectiveness of the proposed algorithm were proved theoretically by Lyapunov algorithm and global stable point. Experimental results show that, by the proposed algorithm, the number of SM decreases by 30%-50%, the end-to-end delay brings down 8-10 ms, the throughput increases about 0.5 Mb/s, the fairness index raises by 0.05, while the control overhead remains unchanged, all of which indicates that the performance of the SM processing mechanism has been improved.

A novel optimized model of distributed multi-hop Cognitive Medium Access Control (C-MAC) protocol with a single transceiver was proposed to handle two restrictions in MAC protocol of Mobile Ad Hoc NETwork (MANET). One is the restriction of multiple transceivers and payload imbalance in different channels, and the other one is the restriction of multi-hop and control overhead. Firstly, channel sensing and data transmission of the new C-MAC protocol were realized in ATIM (Announcement Traffic Indication Message) window and DATA window respectively based on Power Saving Mode (PSM), which made them separated in time domain. Secondly, power value was nonuniform quantized and Gray encoded to decrease float overhead caused by node mobility. Then, a distributed cooperation mechanism was raised for multi-hop networking, based on which channel switching rule was redefined to guarantee that channels would be used fairly and balanced. Last, metrics as Channel Vacate Time (CVT), Channel Opening Time (COT), throughput and channel payload time were considered by simulation. Results show that, the novel protocol could execute independently without several transceivers, the difference values of CVT, COT and payload time among different channels reduce by 13 ms, 20 ms and 100 s respectively, and corresponding throughput rises about 1.5%, all of which realize the optimization of protocol performance in transceiver restriction, payload balance, throughput and overhead control.