# Revolution or Evolution? Technical Requirements and Considerations towards 6G Mobile Communications
## 1 Introduction
As asserted by the authors, the objective of the study is to offer increased guidance to facilitate future research in the field of green 6G. Reference [9] presents a thorough discussion on 6G on the basis of the review of 5G developments, including visions and requirements, technological developments, and challenges. The objective is to address the issues of capacity, coverage, and user data rate as well as the movement speed of mobile communication systems. An alternative survey study is also conducted in [10]. The paper discusses the most aspiring research areas from the latest literature that have a common direction for the 6G projects. It mainly contributes towards examining the vital issues and possible attributes of 6G communications, such as (i) vision and main features, (ii) challenges and possible solutions, and (iii) research activities. An extensive examination of these disputed research topics was performed with respect to the motivation of their distinct sub-domains so that a clear, concrete, and succinct conclusion could be made. Subsequent review work is also conducted in [11] that considered a distinct review approach. The work presents and discusses a sample of \"Internet of things\" (IoT) use cases that indicate the different types of its implementations. The use cases are selected from the most research-active segments that may take advantage of 6G and its enabling tech nologies. These include the domains of healthcare, transport, smart grids, and Industry 4.0. Furthermore, a few of the practical issues encountered and the lessons learned from implementing these use cases are determined. In this review, the cases' key requirements are discussed as well as how they overlap with the main drivers for the upcoming generation of wireless networks. A historical review study of past networking technologies and the way they have determined the existing trends in 6G networking was first presented in [12]. After this, it elaborates on the four main areas of 6G networks: distributed AI, real-time intelligent edge computing, 3D intercoms, and intelligent radio. In addition, it also elaborates on certain potential development technologies in each domain in addition to the related security and privacy challenges that emerge. A report on the possible application of 6G is finally presented in the survey. In addition to this, a critical assessment of the vision of 6G wireless communication and its network structure is carried out in the survey study [13]. The study presents an overview of the various critical technical challenges experienced, certain potential solutions relevant to fourth generation (4G), the physical layer transmission processes, network designs, and security measures. Although every paper has outlined several contributions, no comprehensive paper addresses technical challenges, highlighting potential applications and key enabler transmission technologies and techniques. Therefore, this paper aims to provide an additional and different contribution to the literature, as a survey paper, compared with the other 6G papers that have been selected and discussed previously. The overview study examines the key improvements provided by 6G technology and compares them with the previous mobile technologies. That includes the data rate speed, system capacity, latency, and other key improvements, such as supporting very high mobility optimal coverage, mobile edge computing, enabling augmented reality (AR), and connection reliability. The paper also discusses the key enabler technologies that will be the main factor for enabling 6G technology to meet the drawn targets. That covers the spectrum of communication technologies, such as THz communication and VLC. The key technical challenges and future trends are also discussed and highlighted. Moreover, this paper compares 5G and 6G in terms of services, technologies, and enabling key technologies. The remainder of the paper is structured as follows: Section 2 summarizes the evolution of mobile wireless communication from first generation (1G) to 6G.