  The sixth generation (6G), unlike any of the previous generations, is
envisioned by 2030 to connect everything. Moreover, in addition to the new use
cases, 6G is expected to support, it will need to provide a superior
performance over 5G. The global connectivity, large network dimensions, users
heterogeneity, extremely low-power consumption, high throughput, ultrahigh
reliability, efficient network operation and maintenance, and low-latency
requirements to be met by future networks inevitably necessitate the autonomy
of 6G. Intelligence, facilitated mainly by the advancement of artificial
intelligence (AI) techniques, is a key to achieve autonomy. In this paper, we
provide a bird's-eye view of 6G, its vision, progress, and objectives.
Furthermore, we present some technologies that would be mainly enabling
intelligent globally connected world. In addition to discussing the role of AI
for future wireless communications, we, unlike any other review papers, provide
our original results which give early evidence for the viability of achieving
6G networks autonomy through leveraging AI advances. Furthermore, we, very
importantly, identify 6G implementation challenges and key innovative
techniques that promise to solve them. This article serves as a starting point
for learners to acquire more knowledge about 6G and also for researchers to
promote more development to the field.
