With the standardization and commercialization completed at an unforeseen
pace for the 5th generation (5G) wireless networks, researchers, engineers and
executives from the academia and industry have turned their attention to new
candidate technologies that can support the next generation wireless networks
enabling more advanced capabilities in sophisticated scenarios. Explicitly, the
6th generation (6G) terrestrial wireless network aims to providing seamless
connectivity not only to users but also to machine type devices for the next
decade and beyond. This paper describes the progresses moving towards 6G, which
is officially termed as ``international mobile telecommunications (IMT) for
2030 and beyond'' in the International Telecommunication Union
Radiocommunication Sector (ITU-R). Specifically, the usage scenarios, their
representative capabilities and the supporting technologies are discussed, and
the future opportunities and challenges are highlighted.Comment: Submitted to an IEEE Magazin