Abstract
The fifth-generation (5G) mobile system is now being deployed across the
world and the scale of 5G subscribers is growing quickly in many
countries. The attention of academia and industry is increasingly
shifting towards the sixth generation (6G) and many pioneering works are
being kicked off, indicating an important milestone in the history of
6G. At this juncture, an overview of the current state of the art of 6G
research and a vision of future communications are of great interest.
This paper thus investigates up-to-date 6G research programs, ambitions,
and main viewpoints of representative countries, institutions and
companies worldwide. Then, the key technologies are outlined and a
vision on “What 6G may look like?” is provided. This paper aims to
serve as an enlightening guideline for interested researchers to quickly
get an overview when kicking off their 6G research.