关键词: 机载自组网, 信道占用统计, 预测, 马尔科夫, 滑动窗口, 负载区间

Abstract: The channel busy-idle degree can be used as a threshold for different priority packet access channel of random competitive MAC protocol in airborne ad hoc network. By limiting access of low priority services to guarantee QoS of high priority services and solve the problem that packets access channel blindly will deteriorate the performance of the whole network. A statistical prediction mechanism for channel occupancy is proposed in this paper. The mechanism adopts the sliding window mechanism, the Weighted-Markov chain forecast model and determines channel busy-idle degree by statistical history information of channel load and getting the difference between the predicted value and the true value as the amendment for the next prediction, so it can provide a theoretical basis for the threshold setting of different priority. Simulation results show that the mechanism has a correct prediction rate of over 90% for channel load, can provide differential services for different priority, and it also can significantly improve the performance of random competition protocol under heavy load.

Key words: airborne ad hoc network, channel occupancy statistics, prediction, Markov, sliding window, load interval