National Institute of Telecommunications (Inatel), S. R. Sapucaí 37540000, MG, Brazil.
Sensors (Basel). 2021 May 4;21(9):3194. doi: 10.3390/s21093194.
The radio-frequency spectrum shortage, which is primarily caused by the fixed allocation policy, is one of the main bottlenecks to the deployment of existing wireless communication networks, and to the development of new ones. The dynamic spectrum access policy is foreseen as the solution to this problem, since it allows shared spectrum usage by primary licensed and secondary unlicensed networks. In order to turn this policy into reality, the secondary network must be capable of acquiring reliable, real-time information on available bands within the service area, which can be achieved by means of spectrum sensing, spectrum occupancy databases, or a combination of them. This Review presents guidelines related to the design of a framework that can be adopted to foster dynamic spectrum access policies. The framework applies special-purpose Internet of Things (IoT) devices that perform spectrum sensing, subsequently feeding a spectrum occupancy database, which in turn will be used by the secondary network to gather information on location-dependent spectrum availability. The guidelines address technological enablers capable of making the framework feasible, reliable and secure.
无线电频率频谱短缺主要是由固定分配政策造成的，是现有无线通信网络部署和新网络发展的主要瓶颈之一。动态频谱接入政策被视为解决这一问题的方案，因为它允许主要授权和次要非授权网络共享频谱使用。为了将这一政策变为现实，次级网络必须能够在服务区域内获取有关可用频段的可靠、实时信息，这可以通过频谱感知、频谱占用数据库或它们的组合来实现。本综述提出了与设计一个框架相关的指导方针，该框架可以被采用以促进动态频谱接入政策。该框架采用专用物联网（IoT）设备执行频谱感知，随后为频谱占用数据库提供数据，反过来，次级网络将使用该数据库来收集关于位置相关频谱可用性的信息。这些指南涉及到使框架可行、可靠和安全的技术推动者。
