中文摘要：

为了更好地提高认知无线电网络中授权频谱的利用率，并为系统用户提供更高质量的服务，采用排队博弈理论研究了混合overlay/underlay频谱共享方式的优化策略。面向认知用户建立了传输时间服从二相阶超指数分布的排队模型，并给出排队模型稳态分布的求解方法。基于收益—支出结构，研究了可视情形下认知用户的个体最优策略及不可视情形下认知用户的纳什均衡策略。以社会收益最优及授权频谱收入最大为目标，给出了认知用户使用授权频谱的接入费用。进行数值实验，揭示了不同策略之间的内在关系，并验证了收费方案的合理性。通过将混合overlay/underlay频谱共享方式下的社会最优收益与overlay频谱共享方式和underlay频谱共享方式下的社会最优收益进行对比，进一步表明了混合overlay/underlay频谱共享方式下的社会最优策略能更加稳定且高效地利用频谱资源。

英文摘要：

In order to improve the licensed spectrum utilization in cognitive radio networks,and provide higher experience quality to system users,the optimizing strategies of the hybrid underlay/overlay spectrum sharing mode was studied.For secondary users,a queuing model with service time following two phase order exponential distribution was constructed,and a method to obtain the steady state distribution was presented for the system model.Based on reward-cost structure,individual optimization strategy with observable case and the Nash equilibrium strategy with unobservable case were discussed.With purpose of optimal social benefit and maximal spectrum incomes,the pricing policies for secondary users to use licensed spectrum were formulated.Using the system experiment,the relations among the different optimal strategies were investigated,and the rationality of the price mechanism was verified.By contrasting the optimal social benefits gained by hybrid underlay/overlay spectrum sharing mode,overlay spectrum sharing mode and underlay spectrum sharing mode,it is further shown that the social optimization strategy of hybrid overlay/underlay sharing mode is more effective and stable to fully use the spectrum resource.