On Green-Energy-Powered Cognitive Radio Networks

Abstract

Green energy powered cognitive radio (CR) network is capable of liberating the wireless access networks from spectral and energy constraints. The limitation of the spectrum is alleviated by exploiting cognitive networking in which wireless nodes sense and utilize the spare spectrum for data communications, while dependence on the traditional unsustainable energy is assuaged by adopting energy harvesting (EH) through which green energy can be harnessed to power wireless networks. Green energy powered CR increases the network availability and thus extends emerging network applications. Designing green CR networks is challenging. It requires not only the optimization of dynamic spectrum access but also the optimal utilization of green energy. This paper surveys the energy efficient cognitive radio techniques and the optimization of green energy powered wireless networks. Existing works on energy aware spectrum sensing, management, and sharing are investigated in detail. The state of the art of the energy efficient CR based wireless access network is discussed in various aspects such as relay and cooperative radio and small cells. Envisioning green energy as an important energy resource in the future, network performance highly depends on the dynamics of the available spectrum and green energy. As compared with the traditional energy source, the arrival rate of green energy, which highly depends on the environment of the energy harvesters, is rather random and intermittent. To optimize and adapt the usage of green energy according to the opportunistic spectrum availability, we discuss research challenges in designing cognitive radio networks which are powered by energy harvesters. Index TermsCognitive radio (CR), spectrum efficiency, energy efficiency, energy harvesting.

Secure resource allocation for green and cognitive device-to-device communication

“…Sci China Inf Sci, 2018, 61(2): 029305, doi: 10.1007 Dear editor, Spectrum efficiency, energy efficiency and communication security are the most significant concerns in the 5G era [1]. Cognitive radio which employs dynamic spectrum sharing, energy harvesting which scavenges energy from ambient sources, and physical layer security which exploits the time varying wireless channels are three promising techniques to enhance spectrum efficiency, energy efficiency and communication security [2,3]. Although energy harvesting cognitive radio networks [4,5] and physical layer security [6,7] have been widely studied in recent years, very few existing work comprehensively address the above three concerns.…”

“…Note that the dropper of the ramp function can be fully compensated when solving problem (3). Based on the optimal solution for problem (3), we can calculate the optimal solution for problem (2). The optimal secure resource allocation is summarized as the following theorem.…”

Security‐Reliability Tradeoff Analysis in Multisource Multirelay Cooperative Networks with Multiple Cochannel Interferers

“…According to [1], the amount of the energy consumed by the information and communication technologies accounts for about 2% to 10% of the global energy consumption, which generate nonnegligible amount of the greenhouse gases. What is worst, this percentage will grow rapidly with the development of the information and communication technologies and the increase of number of wireless devices.…”

On energy cooperation in energy harvesting underlay cognitive radio network

“…Energy harvesting cognitive radio network (EH-CRN) has emerged as a promising solution to the problem of spectrum scarcity while achieving green communication at the same time [1]- [3]. EH-CRNs operating in interweave, overlay and underlay mode, have been extensively considered in the literature [4]- [14].…”