A key enabler for the intelligent information society of 2030, 6G networks are expected to
provide performance superior to 5G and satisfy emerging services and applications. In this
article, we present our vision of what 6G will be and describe usage scenarios and
requirements for multi-terabyte per second (Tb/s) and intelligent 6G networks. We present a
large-dimensional and autonomous network architecture that integrates space, air, ground,
and underwater networks to provide ubiquitous and unlimited wireless connectivity. We also …