5G NTN定时提前调整策略分析  

Analysis on Timing Advance Adjustment Strategies of 5G NTN

作　　者：叶向阳 单单 韩春娜 张建国 Ye Xiangyang;Shan Dan;Han Chunna;Zhang Jianguo(Huaxin Consulting Co.,Ltd.,Hangzhou 310052,China;Nokia Solu-tions and Networks System Technology Co.,Ltd Zhejiang Branch,Hangzhou 310053,China)

机构地区：[1]华信咨询设计研究院有限公司,浙江杭州310052 [2]诺基亚通信系统技术(北京)有限公司浙江分公司,浙江杭州310053

出　　处：《邮电设计技术》2023年第9期58-62,共5页Designing Techniques of Posts and Telecommunications

摘　　要：首先阐述了5G NTN的网络架构,指出NTN有透明转发和再生转发两大场景,较大的传播时延不可避免地对5G NR定时提前调整策略带来了极大的挑战。然后分析了5G NTN上行定时提前调整策略,通过引入上行时间同步参考点,由gNB指定UE补偿时延的数值,如UE补偿服务链路和馈电链路在内的所有时延,或UE只补偿服务链路的时延;gNB通过向UE广播定时漂移信息,以补偿LEO卫星移动引起的大的定时漂移。最后对5G NTN定时关系进行了分析,包括上行定时关系增强和MAC CE定时关系增强。Firstly,it introduces 5G NTN architectures and points out that NTN has two scenarios:transparent forwarding and regenerative forwarding.The large propagation delay inevitably brings great challenges to the timing advance adjustment strategy of 5G NR.Then,it analyzes uplink timing advance adjustment strategies of 5G NTN.By introducing the uplink time synchronization reference point,gNB specifies the value of UE delay compensation,for example,UE compensates all delays including the service link and the feed link,or UE only compensates the delay of the service link.The gNB broadcasts timing drift information to UE to compensate the large timing drift due to LEO satellite movement.Finally,it analyzes the timing relationship of 5G NTN,including uplink timing relationship enhancement and MAC CE timing relationship enhancement.

关 键 词：5G NTN 定时提前 传播时延 同步参考点 定时关系 

分 类 号：TN929.5[电子电信—通信与信息系统]