手机直连卫星的覆盖增强关键技术  

Research on coverage enhancement technologies for direct-to-satellite service

作　　者：孙晓南 周世东[2] 康绍莉 SUN Xiaonan;ZHOU Shidong;KANG Shaoli(C-ICT Mobile Communication Technology Co.,Ltd,Beijing 100083 China;Tsinghua University,Beijing 100084,China)

机构地区：[1]中信科移动通信技术股份有限公司,北京100083 [2]清华大学,北京100084

出　　处：《空间电子技术》2024年第6期82-91,共10页Space Electronic Technology

基　　金：国家重点研发计划资助项目(编号:2022YFB2902605)。

摘　　要：针对手机直连卫星面临的覆盖增强问题,文章从解决链路预算不足、解决广域覆盖两方面出发,研究信号重复传输、多时隙联合信道估计、参考信号功率增强、高增益天线、跳波束、控制和业务波束分离、动态资源分配等覆盖增强关键技术。从每项关键技术,分析技术原理,进行性能评估,并探讨对非地面网络(non-terrestrial network,NTN)标准协议的影响及优化设计。研究表明重复传输可以直接有效的改善链路性能,但对于时域资源受限的场景,多时隙联合信道估计技术和参考信号功率增强可提供有限的链路增益。系统级覆盖增强依赖于波束管理策略,从多个维度对星上资源进行灵活调度,从而实现广域覆盖增强。For the coverage enhancement problem in the scenario of direct-to-satellite service,this paper gives solutions from limited link aspect and wide coverage aspect,studying a series of key technologies including signal repetition transmission,multi-slot joint channel estimation,reference signal power increasing,high gain antenna,beam splitting,beam hopping,power allocation and service-based dynamic resource allocation.For each key technology,this paper analyzes from following three aspects:theoretical analysis,performance evaluation,impact on specification and optimization ideas.Studies show that repeated transmission can directly and effectively improve the link budget performance,but for time-domain resource-constrained scenarios,multi-slot joint channel estimation technology and reference signal power enhancement can provide limited link budget gain.System-level coverage enhancement relies on the beam management to flexibly schedule on-board resources from multiple dimensions to achieve wide-area coverage enhancement.

关 键 词：手机直连卫星 非地面网络 覆盖增强 重复传输 联合信道估计 

分 类 号：V443[航空宇航科学与技术—飞行器设计]