次用户信道使用公平和QoS保障原则的FQMAC协议

his paper proposed FQMAC (fair and QoS guaranteed MAC) protocol used in the scenario of heterogeneous cognitive radio networks coexisting. Time was divided into beacon periods using beacon frame synchronization. During one beacon period, channel sensing, channel negotiation, and data transmission were performed respectively. The channels occupied by secondary users of other heterogeneous networks were treated as useful channels too. Useful channels were classified into different levels according to their quality, and secondary users were classified into different levels according to their service characteristics too. High level users prioritize high level channels. The reasonable duration of the channel negotiation phase was obtained by establishing a Markov chain model. Simulation results show that FQMAC can improve the throughput of the network, guarantee the users' QoS (Quality of Service) , and achieve better fairness.