In recent years,satellite Internet has developed rapidly,with major countries around the world actively pro-moting the construction of satellite Internet. The integration of satellite and terrestrial networks has become an impor-tant trend in the evolution towards 6G,and direct-to-handset satellite services has also become a selling point for ter-minal manufacturers. The current state of global direct-to-handset satellite services was summarized,three develop-ment routes for direct-to-handset satellite technology were proposed,and the challenges faced by direct-to-handset sat-ellite connections were analyzed,including the integration of terminal chips,integration of satellite and terrestrial net-works,and sharing of frequencies between satellite and terrestrial systems. The key technologies that need to be mas-tered for direct-to-handset satellite services were also outlined,such as time-frequency synchronization technology,random access technology,HARQ retransmission technology,and mobility management technology,and the future trends of direct-to-handset satellite services were assessed.
关键词
卫星互联网/手机直连卫星/星地融合
Key words
satellite Internet/direct-to-handset satellite/the integration of satellite and terrestrial
维普
万方数据