The Performance Analysis of SPMA Protocol in High Speed Mobile Ad Hoc Network

Aiming at the performance analysis of statistical priority-based multiple access (SPMA) protocol, the time slot transmission probability modeling method based on preemptive M/G/1 queue is pro-posed. The equation of time slot transmission probability is deduced through mathematical modeling, and the solution method under given system parameters is given. Then, the successful reception probability of the message is derived, and the general relationship between the successful reception probability and the duty cycle is established, so as to obtain the threshold setting method of the message with the highest priority. To solve the contradiction between channel utilization maximization and priority scheduling mechanism between nodes, the strategy of minimizing re- served resources among priorities is adopted to set the low priority threshold with the minimum threshold difference, which solves the SPMA protocol threshold setting problem. The simulation scenario of high speed mobile ad hoc network is established. The performance curves of SPMA protocol under typical simulation parameters are obtained, including throughput, probability of successful transmission and end-to-end transmission delay, etc. The effectiveness of the proposed method is verified comprehensively.