Abstract—In order to overcome the spectrum scarcity in 5G networks, spectrum sharing is being studied relying on Cognitive Radio (CR) technology. Even with the new spectrum resources (millimeter-wave) for future networks, sharing the spectrum below 6 GHz and above will be necessary. The four stages as processes to achieve spectrum sharing were classified using a novel taxonomy for the latest techniques with their applicability. The proposed algorithms and studies in the literature on spectrum sharing techniques were summarized on the basis of an analytical study. According to 5G requirements several challenges need to be defeated such as large capacity, ultra-low latency, full coverage, and numerous connectivity. This paper presents a comprehensive survey on the sharing techniques which may be applicable to 5G networks. Yet, the challenges provided an open issues which attracted the interest of researchers to a key techniques such as full duplex spectrum sensing, spectrum sensing based on spectrum database, compressive spectrum sensing, spectrum allocation based on auction theory, spectrum allocation based on aggregation technologies, hybrid Dynamic Spectrum Access (DSA), and hybrid handoff mechanism. To realize the wide spectrum sharing concept, our paper focus on the efficient use of all spectrum resources by exploitation all the obtainable spectrum holes in licensed and unlicensed bands. We specify the applicability of each technique and its performance to recognize the preferable techniques for 5G networks. Finally, the potential challenges and open issues have been discussed, focusing on the spectrum sharing in small cells, also future research directions are suggested.
 

Index Terms—5G, aggregation technologies, cognitive radio technology, dynamic spectrum access technique, spectrum sharing, spectrum sensing techniques

Cite: Saif Hikmat Mousa, Mahamod Ismail, Rosdiadee Nordin, and Nor Fadzilah Abdullah, “Effective Wide Spectrum Sharing Techniques Relying on CR Technology toward 5G: A Survey,”Journal of Communications vol. 15, no. 2, pp. 122-147, February 2020. Doi: 10.12720/jcm.15.2.122-147

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