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1. School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876 2. Institute of Network Technology, Beijing University of Posts and Telecommunications, Beijing 100876 Abstract: To achieve a deeper level of intelligent communication for human beings, the sixth generation mobile communication system (6G) will realize the extension from the real world to the virtual world. To this end, the “human-machine-thing-genie” problem introduced by 6G was presented, and an evolved dual-world architecture for 6G was proposed. The architecture includes the fourth elements of 6G, genie, in the virtual world. The potential key theories and technologies to support the design and implementation of 6G were proposed and analyzed.