Abstract

Following the commercialization of 5G technologies, both academia and industry are initiating research activities to shape the next-generation communication system, namely 6G. Considering the general trend of successive generations of communication systems introducing new services with more stringent requirements, it is reasonable to expect 6G to satisfy unprecedented requirements and expectations that 5G cannot meet. We expect that 6G will provide ultimate experience for all through hyper-connectivity involving humans and everything. In this research, we aim to provide readers with a comprehensive overview of various aspects related to 6G, including technical and societal trends, services, requirements, and candidate technologies.

SUMMARY
For 6G, it should be pointed out that many frequency bands spanning from 28GHz to 90GHz (and beyond) are also under consideration. This spectrum has already been extensively used for decades, mostly for satellite communications in the figure below: