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首页> 外文期刊>IEEE transactions on mobile computing >Joint Optimal Sensor Selection and Scheduling in Dynamic Spectrum Access Networks
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Joint Optimal Sensor Selection and Scheduling in Dynamic Spectrum Access Networks

机译：动态频谱接入网络中传感器的联合最优选择和调度

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摘要

Spectrum sensing is key to the realization of dynamic spectrum access. To protect primary users' communications from the interference caused by secondary users, spectrum sensing must meet the strict detectability requirements set by regulatory bodies, such as the FCC. Such strict detection requirements, however, can hardly be achieved using PHY-layer sensing techniques alone with one-time sensing by only a single sensor. In this paper, we jointly exploit two MAC-layer sensing methods—cooperative sensing and sensing scheduling— to improve spectrum sensing performance, while incurring minimum sensing overhead. While these sensing methods have been studied individually, little has been done on their combinations and the resulting benefits. Specifically, we propose to construct a profile of the primary signal's RSSs and design a simple, yet near-optimal, incumbent detection rule. Based on this constructed RSS profile, we develop an algorithm to find 1) an optimal set of sensors; 2) an optimal point at which to stop scheduling additional sensing; and 3) an optimal sensing duration for one-time sensing, so as to make a tradeoff between detection performance and sensing overhead. Our evaluation results show that the proposed sensing algorithms reduce the sensing overhead by up to 65 percent, while meeting the requirements of both false-alarm and misdetection probabilities of less than 0.01.
机译：频谱感测是实现动态频谱访问的关键。为了保护主要用户的通信不受次要用户造成的干扰，频谱感测必须满足FCC等监管机构设定的严格可检测性要求。但是，仅使用PHY层感测技术和仅通过单个传感器进行一次感测很难实现这种严格的检测要求。在本文中，我们共同开发了两种MAC层感测方法-协同感测和感测调度-在提高频谱感测性能的同时，将感测开销降至最低。尽管已单独研究了这些传感方法，但对其组合及其所带来的好处却鲜有研究。具体来说，我们建议构建主要信号RSS的配置文件，并设计一个简单但接近最佳的现有检测规则。基于此构造的RSS配置文件，我们开发了一种算法来找到1）最佳传感器集合； 2）停止调度其他感应的最佳点； 3）一次感测的最佳感测持续时间，以在检测性能和感测开销之间进行权衡。我们的评估结果表明，所提出的传感算法可将传感开销减少多达65％，同时满足误报警和误检概率均小于0.01的要求。

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