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中文摘要：
基于周期性带内检测机制建立了一种优先级队列模型，得到了周期性带内检测机制的性能指标．针对周期性带内检测机制中缺乏对次用户空闲状态时间的利用，提出了一种基于空闲时间的带内主动感知策略（Idle Time based In—band Proactive Sensing Strategy，ITIPSS）．该策略在执行周期性带内感知的基础上，利用次用户的空闲时间主动感知当前占用的授权频段，以降低检测延时．仿真结果表明，相比周期性带内检测机制，ITIPSS能够有效降低对主用户的检测延时，从而减少次用户对主用户工作的干扰．
英文摘要：
This paper formulated a priority queuing model for the periodical in-band sensing mechanism. On the basis of the analysis of this model, in which the idle time of the secondary user is lack of utilization, the paper proposed an idle time based in-band proaetive sensing strategy （ITIPSS）. In addition to executing periodical in-band sensing, ITIPSS uses the idle time gaps of the secondary user to detect the primary＇s return proactively. The simulation results show that ITIPSS can shorten the detection delay to the primary user significantly and improve the protection of the primary user efficiently.
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