System integration of terrestrial mobile communication and satellite communication -the trends, challenges and key technologies in B5G and 6G

• Published in: China communications Vol. 17; no. 12; pp. 156 - 171
• Main Authors: Chen, Shanzhi, Sun, Shaohui, Kang, Shaoli
• Format: Journal Article
• Language: English
• Published: China Institute of Communications 01.12.2020; State Key Laboratory of Wireless Mobile Communications, China Academy of Telecommunication Technology, Beijing 100191, China
• Subjects: 5G mobile communication; 6G mobile communication; B5G; Digital video broadcasting; Low earth orbit satellites; Satellite broadcasting; Satellite communication; space internet; system integration; terrestrial mobile communication; terrestri-al mobile communication; 6G; satellite communication; system integration; B5G; space internet
• ISSN: 1673-5447
• DOI: 10.23919/JCC.2020.12.011

Mobile communication standards have been developed into a new era of B5G and 6G. In recent years, low earth orbit (LEO) satellites and space Internet have become hot topics. The integrated satellite and terrestrial systems have been widely discussed by industries and academics, and even are expected to be applied in those huge constellations in construction. This paper points out the trends of two stages towards system integration of the terrestrial mobile communication and the satellite communications: to be compatible with 5G, and to be integrated within 6G. Based on analysis of the challenges of both stages, key technologies are thereafter analyzed in detail, covering both air interface currently discussed in 3GPP for B5G and also novel network architecture and related transmission technologies toward future 6G.