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.

翻译：第五代(5G)移动系统正在世界各地部署,许多国家的5G用户规模正在迅速扩大,学术界和产业界的注意力正日益转向第六代(6G),许多开创性作品正在被踢走,这标志着6G历史上的一个重要里程碑。 此时此刻,对6G研究的当前最新水平和对未来通信的展望非常感兴趣。 因此,本文件调查了最新的6G研究方案、雄心和全世界有代表性的国家、机构和公司的主要观点。 然后,概述了关键技术,并提出了关于“6G可能是什么样子”的愿景。本文件旨在作为指导有兴趣的研究人员在启动6G研究时迅速获得概览的启迪指南。