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First, to satisfy the requirement of global coverage, 6G will not be limited to terrestrial communication networks, which will need to be complemented with non-terrestrial networks such as satellite and unmanned aerial vehicle (UAV) communication networks, thus achieving a space-air-ground-sea integrated communication network. Second, all spectra will be fully explored to further increase data rates and connection density, including the sub-6 GHz, millimeter wave (mmWave), terahertz (THz), and optical frequency bands. Third, facing the big datasets generated by the use of extremely heterogeneous networks, diverse communication scenarios, large numbers of antennas, wide bandwidths, and new service requirements, 6G networks will enable a new range of smart applications with the aid of artificial intelligence (AI) and big data technologies. Fourth, network security will have to be strengthened when developing 6G networks. This article provides a comprehensive survey of recent advances and future trends in these four aspects. Clearly, 6G with additional technical requirements beyond those of 5G will enable faster and further communications to the extent that the boundary between physical and cyber worlds disappears.<\/jats:p>","DOI":"10.1007\/s11432-020-2955-6","type":"journal-article","created":{"date-parts":[[2020,12,4]],"date-time":"2020-12-04T06:02:50Z","timestamp":1607061770000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1680,"title":["Towards 6G wireless communication networks: vision, enabling technologies, and new paradigm shifts"],"prefix":"10.1007","volume":"64","author":[{"given":"Xiaohu","family":"You","sequence":"first","affiliation":[]},{"given":"Cheng-Xiang","family":"Wang","sequence":"additional","affiliation":[]},{"given":"Jie","family":"Huang","sequence":"additional","affiliation":[]},{"given":"Xiqi","family":"Gao","sequence":"additional","affiliation":[]},{"given":"Zaichen","family":"Zhang","sequence":"additional","affiliation":[]},{"given":"Mao","family":"Wang","sequence":"additional","affiliation":[]},{"given":"Yongming","family":"Huang","sequence":"additional","affiliation":[]},{"given":"Chuan","family":"Zhang","sequence":"additional","affiliation":[]},{"given":"Yanxiang","family":"Jiang","sequence":"additional","affiliation":[]},{"given":"Jiaheng","family":"Wang","sequence":"additional","affiliation":[]},{"given":"Min","family":"Zhu","sequence":"additional","affiliation":[]},{"given":"Bin","family":"Sheng","sequence":"additional","affiliation":[]},{"given":"Dongming","family":"Wang","sequence":"additional","affiliation":[]},{"given":"Zhiwen","family":"Pan","sequence":"additional","affiliation":[]},{"given":"Pengcheng","family":"Zhu","sequence":"additional","affiliation":[]},{"given":"Yang","family":"Yang","sequence":"additional","affiliation":[]},{"given":"Zening","family":"Liu","sequence":"additional","affiliation":[]},{"given":"Ping","family":"Zhang","sequence":"additional","affiliation":[]},{"given":"Xiaofeng","family":"Tao","sequence":"additional","affiliation":[]},{"given":"Shaoqian","family":"Li","sequence":"additional","affiliation":[]},{"given":"Zhi","family":"Chen","sequence":"additional","affiliation":[]},{"given":"Xinying","family":"Ma","sequence":"additional","affiliation":[]},{"given":"Chih-Lin","family":"I","sequence":"additional","affiliation":[]},{"given":"Shuangfeng","family":"Han","sequence":"additional","affiliation":[]},{"given":"Ke","family":"Li","sequence":"additional","affiliation":[]},{"given":"Chengkang","family":"Pan","sequence":"additional","affiliation":[]},{"given":"Zhimin","family":"Zheng","sequence":"additional","affiliation":[]},{"given":"Lajos","family":"Hanzo","sequence":"additional","affiliation":[]},{"given":"Xuemin (Sherman)","family":"Shen","sequence":"additional","affiliation":[]},{"given":"Yingjie Jay","family":"Guo","sequence":"additional","affiliation":[]},{"given":"Zhiguo","family":"Ding","sequence":"additional","affiliation":[]},{"given":"Harald","family":"Haas","sequence":"additional","affiliation":[]},{"given":"Wen","family":"Tong","sequence":"additional","affiliation":[]},{"given":"Peiying","family":"Zhu","sequence":"additional","affiliation":[]},{"given":"Ganghua","family":"Yang","sequence":"additional","affiliation":[]},{"given":"Jun","family":"Wang","sequence":"additional","affiliation":[]},{"given":"Erik G.","family":"Larsson","sequence":"additional","affiliation":[]},{"given":"Hien Quoc","family":"Ngo","sequence":"additional","affiliation":[]},{"given":"Wei","family":"Hong","sequence":"additional","affiliation":[]},{"given":"Haiming","family":"Wang","sequence":"additional","affiliation":[]},{"given":"Debin","family":"Hou","sequence":"additional","affiliation":[]},{"given":"Jixin","family":"Chen","sequence":"additional","affiliation":[]},{"given":"Zhe","family":"Chen","sequence":"additional","affiliation":[]},{"given":"Zhangcheng","family":"Hao","sequence":"additional","affiliation":[]},{"given":"Geoffrey Ye","family":"Li","sequence":"additional","affiliation":[]},{"given":"Rahim","family":"Tafazolli","sequence":"additional","affiliation":[]},{"given":"Yue","family":"Gao","sequence":"additional","affiliation":[]},{"given":"H. 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