摘要
卫星通信作为全球通信网络的关键组成部分,在偏远地区覆盖与应急通信中具有不可替代性。然而,手机直连卫星等新兴应用的发展对系统容量提出了更高要求,亟须解决波束规模化发展、波束内用户数的增长及用户速率的提升等技术挑战。为此,3GPP自Rel-18版本开展覆盖增强与容量增强技术研究。以3GPP在研的基于正交覆盖码(orthogonal covering code,OCC)的上行容量增强方案为基础,系统分析其技术路径并通过仿真评估其性能,同时探讨下行容量增强的标准化方向,为5G非地面网络(non terrestrial network,NTN)后续演进提供技术参考,并进一步提出基于图样分割多址接入(pattern division multiple access,PDMA)的非正交容量增强策略,从多用户接入效率与频谱资源利用维度突破传统正交多址限制,为6G NTN的超大容量需求奠定理论与技术基础。研究结果表明,通过对资源利用的优化,卫星通信系统容量得到显著提升,能够有效支撑未来NTN的规模化部署。
Satellite communication,as a key component of the global communication network,is irreplaceable in providing coverage in remote areas and for emergency communications.However,the development of emerging applications such as direct satellite connections for mobile phones has raised higher requirements for system capacity,urgently necessitating solutions to technical challenges such as scalable beam development,increased user numbers within beams,and improved user rates.To address this,3GPP had initiated research on coverage enhancement and capacity enhancement technologies starting from the Rel-18 version.Based on the uplink capacity enhancement scheme using orthogonal covering codes(OCC)that is currently under research by 3GPP,the technical pathway was systematically analyzed and its performance was evaluated through simulations.Additionally,the standardization direction for downlink capacity enhancement was explored,providing technical reference for the subsequent evolution of 5G non-terrestrial network(NTN).Furthermore,a non-orthogonal capacity enhancement strategy based on pattern division multiple access(PDMA)was proposed,breaking through the traditional orthogonal multiple access limitations from the perspectives of multi-user access efficiency and spectrum resource utilization,and laying a theoretical and technical foundation for meeting the ultra-large capacity demands of 6G NTN.The research results indicate that through the optimization of resource utilization,the capacity of satellite communication systems can be significantly enhanced,effectively supporting the large-scale deployment of NTN in the future.
作者
林家贤
关鹃
康绍莉
陈山枝
LIN Jiaxian;GUAN Juan;KANG Shaoli;CHEN Shanzhi(China Academy of Telecommunications Technology,Beijing 100083,China;CICT Mobile Communication Technology Co.,Ltd.,Beijing 100083,China;State Key Laboratory of Wireless Mobile Communication,Beijing 100083,China)
出处
《电信科学》
北大核心
2025年第8期101-114,共14页
Telecommunications Science
基金
国家重点研发计划项目(No.2022YFB2902605)。
