Guest editorial: 6G towards 2030: From key technology to network architecture

With the large-scale commercialization of 5th generation (5G) network globally, 5G together with artificial intelligence (AI), cloud and big data is accelerating the digitalization of the world, which push the society move towards a "digital twin" world composed of the physical world and its digital mirror. The digital twin world will enable us to predict the future and reshape the future in social governance and many industries. The ubiquitous intelligence will enable intelligent connection anytime and any place and make an intelligent world. The 6th generation (6G) mobile network is expected to be commercialized towards 2030.