中文摘要：

针对现有方案在系统服务等级约束下可能会降低认知无线网络可达业务负荷的问题，提出了一种新的频谱共享机制以提高系统服务等级约束下具有异构业务的认知无线网络可达业务负荷。该机制的主要思想是根据实时业务和非实时业务的不同延时特性，分别引入剥夺优先权和缓冲队列，进而同时减小异构次用户呼叫的强制中断概率和阻塞概率。仿真结果表明，所提机制能有效提高系统服务等级约束下认知无线网络的可达业务负荷。

英文摘要：

To improve the achievable traffic load of secondary user（SU） under grade of service （GoS） constraints in cognitive wireless networks with heterogeneous traffic, a novel spectrum sharing scheme was proposed. The key idea of the proposed scheme was to introduce preemptive priority and buffering mechanism for real-time traffic and non-real-time traffic, respectively, according to their different delay characteristics. The proposed scheme could reduce the forced termination probability and the blocking probability for heterogeneous calls simultaneously. Numerical results show that the proposed scheme can effectively improve the achievable traffic load of SUs under GoS constraints.