Abstract:

A channel access strategy based on partial observable Markov decision processes (POMDP) is presented in allusion to the problem of performance degrades seriously when load becomes heavy, the access threshold value settings is lacked in the theoretical basis and unable to effectively support the quality of serive requirement of multipriority service of the random competition medium access control protocol in airborne network. The dynamic programming function is established by which based on channel occupation cost of different priority burst as the objective function, the compact statespace method is adopted to simplify the solutionfinding, the expression for the theory approximately optimal access threshold value within the different priority burst is worked out. The value can provide theoretical foundation for access decision processes of different priority burst and can effectively control the access collision within different priority burst. The simulation results show that transmission performance of delay and success probability can be improved obviously,the realtime and reliability demands of data transmission in military aeronautical communications are satisfied.