The Analysis of the MAC Protocol of Two-Class Priority Station Polling System under Mixed Services Policy of Exhaustive and Two-Times Gated Services

Based on the ideas of priority service, self-adaptation to loading, and conflict-free transmission with high-efficiency, this article proposes a new analysis model of MAC protocol of wireless communication network, which has made possible the polling service capable of differentiating the stations of different priority levels under mixed services policy and has improved the system´s flexibility and adaptability via adjustment of the switch-in service in time of load change input. The theoretical model of this protocol is established through Markov chain and probability generating function. Mathematical analysis is made on the mean queue length and the mean cyclic time of the common queue and the key station. It is found that the findings from theoretical analysis correspond well with those from simulated experiments.