Near-Space Communications: The Last Piece of 6G Space-Air-Ground-Sea Integrated Network Puzzle

Hongshan Liu, Tong Qin, Zhen Gao*, Tianqi Mao*, Keke Ying, Ziwei Wan, Li Qiao, Rui Na, Zhongxiang Li, Chun Hu, Yikun Mei, Tuan Li, Guanghui Wen, Lei Chen, Zhonghuai Wu, Ruiqi Liu, Gaojie Chen, Shuo Wang*, Dezhi Zheng

*此作品的通讯作者

科研成果: 期刊稿件文献综述同行评审

3 引用 (Scopus)

摘要

This article presents a comprehensive study on the emerging near-space communications (NS-COM) within the context of space-air-ground-sea integrated network (SAGSIN). Specifically, we firstly explore the recent technical developments of NS-COM, followed by the discussions about motivations behind integrating NS-COM into SAGSIN. To further demonstrate the necessity of NS-COM, a comparative analysis between the NS-COM network and other counterparts in SAGSIN is conducted, covering aspects of deployment, coverage, channel characteristics, and unique problems of NS-COM network. Afterward, the technical aspects of NS-COM, including channel modeling, random access, channel estimation, array-based beam management, and joint network optimization, are examined in detail. Furthermore, we explore the potential applications of NS-COM, such as structural expansion in SAGSIN communication, civil aviation communication, remote and urgent communication, weather monitoring, and carbon neutrality. Finally, some promising research avenues are identified, including stratospheric satellite-to-ground direct links for mobile terminals, reconfigurable multiple-input multiple-output and holographic multiple-input multiple-output, federated learning in NS-COM networks, maritime communication, electromagnetic spectrum sensing and adversarial game, integrated sensing and communications, stratospheric-satellite-based radar detection and imaging, NS-COM-assisted enhanced global navigation system, NS-COM-assisted intelligent unmanned system, and free-space optical communication. Overall, this paper highlights that the NS-COM plays an indispensable role in the SAGSIN puzzle, providing substantial performance and coverage enhancement to the traditional SAGSIN architecture.

源语言英语
文章编号0176
期刊Space: Science and Technology (United States)
4
DOI
出版状态已出版 - 1 1月 2024

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Liu, H., Qin, T., Gao, Z., Mao, T., Ying, K., Wan, Z., Qiao, L., Na, R., Li, Z., Hu, C., Mei, Y., Li, T., Wen, G., Chen, L., Wu, Z., Liu, R., Chen, G., Wang, S., & Zheng, D. (2024). Near-Space Communications: The Last Piece of 6G Space-Air-Ground-Sea Integrated Network Puzzle. Space: Science and Technology (United States), 4, 文章 0176. https://doi.org/10.34133/space.0176