摘要
Abstract
As mobile communication systems approach the transition from fifth-generation to sixth-generation,the demand for ubiquitous connectivity continues to increase.However,coverage limitations of terrestrial networks in remote,maritime,and aerial scenarios still constrain the large-scale deployment of global Internet of Things(IoT)and emergency communication services.Space-ground integrated networks have therefore emerged as a key enabling solution for achieving space-air-ground-sea integrated coverage in 6G by combining the wide-area coverage of satellite systems with the high data rate and low-latency characteristics of terrestrial networks.This paper provides a comprehensive survey of the current status and enabling technologies of space–ground integrated networks.The layered architecture consisting of space-based,aerial,terrestrial,and maritime segments is first introduced,along with representative networking paradigms such as transparent relaying and unified core networks.Subsequently,recent research progress on key technologies,including efficient wireless transmission,intelligent routing,network slicing,and integrated sensing and communication,is reviewed from the perspectives of spatial extension,intelligence empowerment,and paradigm evolution.Finally,typical application scenarios,major challenges,and future development trends are discussed.关键词
6G星地融合网络/分层组网架构/空天地海一体化/全域覆盖Key words
6G integrated satellite-terrestrial network/layered networking architecture/space-air-ground-sea integration/ubiquitous coverage分类
信息技术与安全科学
