CAREER: Routing in Cognitive Radio Networks Considering Activities of Primary Users

在认知无线电网络（CRN）中，两种类型的用户（主用户（PU）和次用户（SU））共享公共频带。SU通过未分配的频谱带进行通信，而不会中断PU。人们普遍认为，PU的活动遵循一些概率模型，而不管时间，地理和社会关系。然而，SU绝对可以利用PU的时间和地理依赖的社交活动模式来获得更多的频谱机会，并帮助以更有意义的方式展示CRN的基本特征。不幸的是，这一事实被忽视了。本项目对融合社交网络和传统CRN技术的路由协议/算法设计进行了全面研究。提出了新的考虑PU活动模式的统计学习模型和社团发现方法。研究了在一定的PU活动模式和社团模式下次级网络的基本性质。为CRN的上层协议设计提供了相应的指导。该项目对CRN以及社交网络的理论和实践方面都有很大的影响。结合PU的特点，阐述了PU研究面临的新挑战和相应问题的意义。该项目整合了研究和教育，旨在吸引本科生和研究生到CRN领域。它也延伸到高中学生。研究结果将为CRN社会提供宝贵的资源，并将在会议、期刊和互联网上发表。

Two types of users, Primary Users (PUs) and Secondary Users (SUs), share common spectrum bands in Cognitive Radio Networks (CRNs). SUs communicate through un-assigned spectrum bands without disrupting PUs. It is widely assumed that the activities of PUs follow some probabilistic models regardless of time, geography and social relationships. However, the time-and-geography-dependent social activity patterns of PUs can definitely be taken advantage of by SUs to obtain more spectrum opportunities and help with featuring the fundamental characteristics of CRNs in a more meaningful way. Unfortunately, this fact has been overlooked. This project conducts a comprehensive study on designing routing protocols/algorithms integrating technologies from social networks and traditional CRNs. New statistic learning models and community detection methods considering PUs' activity patterns are proposed. The fundamental properties of secondary networks under certain activity patterns and community patterns of PUs are investigated. Corresponding guidance for designing upper layer protocols for CRNs is provided. This project has a strong impact on both theoretical and practical aspects of CRNs as well as social networks. Considering the characteristics of PUs, new research challenges and significance of the corresponding problems are elaborated. The project integrates research and education with the intent of attracting undergraduate and graduate students to the area of CRNs. It also outreaches high school students. The outcomes will provide valuable resources for the CRN society and will be published in conferences, journals, and on the Internet.