认知无线电网络链路层关键技术的研究进展

构建认知无线电网络是解决频谱资源日趋紧张问题的根本途径.为实现无干扰的伺机频谱共享,认知无线电网络的链路层不仅需要提供传统的数据传输服务,还必须支持一套与频谱非均匀特性相适应的新功能.对这些新功能所需的关键技术进行了归纳,分别从协作感知、感知机制优化、动态频谱接入、动态频谱分配、跨层设计及安全机制等6个方面进行了探讨,重点对这些关键技术的最新研究进展进行了总结和分析,并讨论了下一步的主要研究方向.

Survey on Linker Layer Key Technologies in Cognitive Radio Networks

Cognitive Radio Network (CRN) has emerged as a promising paradigm to solve the increasingly serious spectrum scarcity problem. To share the existing licensed spectrum opportunistically without interference, the linker layer of CR N, besides providing the traditional services for data transmission, is required to support an entirely new set of functionalities. A survey on the key technolo gies required by these functionalities is given in this paper, with focus on six aspects in particular, including cooperative sensing, sensing mechanism optimiz ation, dynamic spectrum access, dynamic spectrum allocation, cross layer design , security design. Based on the summaries and analysis of the latest development , directions of the future work are investigated.