_____________________________________________________________________________________________________ *Corresponding author: E-mail: bakhitamine@yahoo.fr; Current Journal of Applied Science and Technology 40(18): 94-111, 2021; Article no.CJAST.71878 ISSN: 2457-1024 (Past name: British Journal of Applied Science & Technology, Past ISSN: 2231-0843, NLM ID: 101664541) A Review of the Use Cases and Possible Technologies for 5G and Beyond Communications Ali Mahamoud Ali 1 , Bakhit Amine Adoum 1,2* , Idriss Saleh Bachar 2 , Nasrullah Armi 3 , Mahamat Saleh Idriss 1 and Mahamoud Youssouf Khayal 1 1 Laboratoire de Mathématiques, Modélisation, Informatique, Applications et Simulation, Laboratoire de Recherche en Technologie de l’Information et de la Communication (LARTIC), FSEA /École Doctorale Sciences Techniques et Environnement, CNRD, N’Djamena, Tchad. 2 Ecole Nationale Supérieure des Technologies de l’Information et de la Communication (ENASTIC), Chad. 3 Indonesian Institute of Sciences, Research Center for Electronics & Telecommunication, Bandung, Indonesia. Authors’ contributions This work was carried out in collaboration among all authors. All authors read and approved the final manuscript. Article Information DOI: 10.9734/CJAST/2021/v40i1831447 Editor(s): (1) Dr. Teresa De Pilli, University of Foggia Italy. Reviewers: (1) Ahmed Thair Alheety, Alfarahidi University, Iraq. (2) Ojo Joseph Sunday, University of Technology Akure, Nigeria. (3) Tasher Ali Sheikh, India. Complete Peer review History: https://www.sdiarticle4.com/review-history/71878 Received 01 June 2021 Accepted 04 August 2021 Published 09 August 2021 ABSTRACT 5G communication system is rapidly taking shape and for many organizations, including administrations, it is important to be aware of developments in this regard. At this stage, it is essential to know about 5G use cases and possible key technologies. This paper describes several anticipated 5G use cases across a handful of different sectors. It is important to remember that these comprise only a subset of possible use cases and these are all still new. As-yet more new use cases are expected to emerge and the need to prepare their adaption in 5G and beyond. From wireless transmission, wireless access and network perspectives, the possible key technologies of 5G, including Massive Multiple Input Multiple Output (MIMO), Beam-forming, Device-to-Device communication system (D2D), non-orthogonal multiple access (NOMA), Full duplex, Small cells, cognitive radio(CR), etc. and their latest progress are presented comprehensively and thoroughly. Each has enormous advantages but also limitations. The Full duplex which will help to double the Review Article