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动态频谱接入技术能够有效缓解日益突出的频谱资源紧缺问题,然而随着认知无线电技术的发展,多个次级网络接入授权频段面临的共存问题也变得更加严峻。近年来的研究表明,传统的频谱感知结果可靠性不足,无法充分保证异构网络间的共存。基于地理频谱数据库的共存技术,能够为网络提供可用频谱信息以及共存信息,从而使得异构网络的共存成为可能。文章首先阐述了地理频谱数据库的发展趋势和技术挑战,接着分析了异构网络共存面临的挑战和研究现状,然后提出了一个基于地理频谱数据库接入授权频谱的系统架构,最后介绍了异构网络共存的关键技术和主要的共存机制,进一步地,为指导共存机制和算法的设计将共存问题公式化地描述成具有一般性的优化问题。
However, with the development of cognitive radio technology, the coexistence issues faced by multiple sub-network access authorization bands become more serious. In recent years, the research shows that the traditional spectrum sensing results are not reliable and can not fully guarantee the coexistence of heterogeneous networks. Based on the coexistence technology of the geographical spectrum database, it is possible to provide the network with available spectrum information and coexistence information, thereby making coexistence of heterogeneous networks possible. The article first describes the development trend and technical challenges of geographic spectrum database, and then analyzes the challenges and current research on the coexistence of heterogeneous networks. Then, it proposes a system architecture of spectrum access based on geographic spectrum database, and finally introduces the heterogeneous network Coexistence of key technologies and the main coexistence mechanism, and further, to coexist the coexistence mechanisms and algorithms designed to coexistence problems formulated as a general optimization problem.