Preface; Part I. Introduction: 1. Mobile communications towards 2030 and beyond Wen Tong, Peiying Zhu, Yan Chen and Wenshuan Dang; Part II. Use Cases and Target KPIs: 2. Extremely immersive human-centric experience Chunqing Zhang and Yan Chen; 3. Sensing, localization, and imaging Danny Kai Pin Tan, Jia He and Yanchun Li; 4. Full-capability industry 4.0 and beyond Xueli An, Xiuqiang Xu and Yingpei Lin; 5. Smart city and smart life Xueli An, Xiuqiang Xu and Yingpei Lin; 6. Global coverage for mobile services Xueliang Shi and Jun Wang; 7. Connected machine learning and networked AI Yiqun Ge, Rong Li, Hui Lin and Yan Chen; Part III. Theoretical Foundations: 8. Theoretical foundations for native AI and machine learning Jean-Claude Belfiore, Merouane Debbah, Rui Ni, Yiqun Ge and Jian Wang; 9. Theoretical foundations for massive capacity and connectivity Rui Ni, Merouane Debbah and Maxime Guillaudl; 10. Theoretical foundations for future machine type communications Jean-Claude Belfiore, Merouane Debbah, Rui Ni and Yiqun Ge; 11. Theoretical foundations for energy-efficient systems Merouane Debbah and Rui Ni; Part IV. New Elements: 12. New spectrum Kun Zeng and Guangjian Wang; 13. New channels Jia He, Ziming Yu; 14. New materials Huanhuan Gu, Morris Repeta and David Wessel; 15. New antennas Huanhuan Gu, Morris Repeta and David Wessel; 16. THz technology Huanhuan Gu, Morris Repeta and David Wessel; 17. Post moore's law computing Huanhuan Gu, Morris Repeta and David Wessel; 18. New devices Xueqiang Yan, Xun Yang, Chunqing Zhang and Huanhuan Gu; Part V. Enabling Technologies for 6G Air Interface Design: 19. Intelligent air interface framework Jianglei Ma, Rong Li, Yongxia Lyv, Hao Tang, Xiaoyan Bi and Liqing Zhang; 20. Integrated terrestrial and non-terrestrial communication Amine Maaref, Hejia Luo and Jianglei Ma; 21. Integrated sensing and communication Alireza Bayesteh, Jiajin Luo and Jia He; 22. New waveforms and modulation schemes Huang Huang and Alireza Bayesteh; 23. New coding Huazi Zhang, Mengyao Ma, Yiqun Ge and Zhongfeng Li; 24. New multiple access Lei Wang, Yan Chen, Liqing Zhang and Jianglei Ma; 25. Ultra-massive MIMO Hadi Baligh, Xiaoyan Bi, Gaoning He, Yong Liu, Huan Sun, Rui Ni, Zhongfeng Li and Jianglei Ma; 26. Integrated super-sidelink and access link communication Chunqing Zhang and Zhongfeng Li; Part VI. New Features for 6G Network Architecture Design: 27. Technologies for the network AI architecture Jianjun Wu, Chenghui Peng, Xueli An and Hang Zhang; 28. User-centric architecture technologies Xueqiang Yan, Artur Hecker, Chenghui Peng and Mingyu Zhao; 29. Native trustworthiness Fei Liu and Rob Sun; 30. Data governance architecture technologies Chenghui Peng, Jianjun Wu, Xueli An, Chenchen Yang and Xu Li; 31. Multi-player ecosystem architecture technologies Hang Zhang, Xueli An, Xun Xiao and Wei Tan; 32. Non-terrestrial network integrated architecture technologies Arashmid Akhavain and Michael Mayer; Part VII. Summary and Future Work: 33. 6G Ecosystem and roadmap Hui Lin, Xueqiang Yan, Yan Chen and Jianmin Lu.