The standardization activities of the fifth generation communications are clearly over
and deployment has commenced globally. To sustain the competitive edge of wireless networks,
industrial and academia synergy have begun to conceptualize the next generation of wireless
communication systems (namely, sixth generation, (6G)) aimed at laying the foundation for the
stratification of the communication needs of the 2030s. In support of this vision, this study highlights
the most promising lines of research from the recent literature in common directions for the
6G project. Its core contribution involves exploring the critical issues and key potential features of
6G communications, including: (i) vision and key features; (ii) challenges and potential solutions;
and (iii) research activities. These controversial research topics were profoundly examined in relation
to the motivation of their various sub-domains to achieve a precise, concrete, and concise conclusion.
Thus, this article will contribute significantly to opening new horizons for future research direction
