Cognitive radio networks for Internet of Things: Applications, challenges and future

Cognitive Radio (CR) has emerged as an intelligent technology to address the spectrum scarcity issues. CR aims to use the unoccupied spectrum band when it is not used by the licensed user. An extensive research has been carried out since the inception of this technology in 1999 where different challenges like spectrum sensing, cooperation amongst CR users and applicability of CR networks have been widely explored. In this paper, we provide new applications of CR technology for Internet of Things (IoT) and propose appropriate solutions to the real challenges in CR technology that will make IoT more affordable and applicable.