5G NTN随机接入过程分析  

Analysis of 5G NTN Random Access Procedure

作　　者：于江涛 王森[2] 张建国 Yu Jiangtao;Wang Sen;Zhang Jianguo(Huaxin Consulting Co.,Ltd.,Hangzhou 310052,China;China Information Technology Designing&Consulting Institute Co.,Ltd.,Beijing 100048,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]中讯邮电咨询设计院有限公司,北京100048

出　　处：《邮电设计技术》2023年第10期40-44,共5页Designing Techniques of Posts and Telecommunications

摘　　要：首先分析了5G NTN的传播时延和差分时延,指出超长的且快速变化的传播时延不可避免地对5G NR的随机接入过程带来了极大的挑战。然后分析了5G NTN时间同步补偿策略,通过引入上行同步参考点、广播2个定时漂移参数和2个调度偏移参数,UE可以有效补偿超长的传播时延和较大的定时漂移,并满足5G NR的时序关系。最后给出了基于竞争的5G NTN随机接入过程。Firstly,it analyzes the propagation delay and differential delay of 5G NTN,it points out that the extremely long and rapidly changing propagation delay inevitably brings great challenges to the random access procedure of 5G NR.Then the time synchronization compensation strategies of 5G NTN are analyzed.By introducing the uplink synchronization reference point,broadcasting two timing drift parameters and two scheduling offset parameters,UE can effectively compensate for the ultra long propagation delay and large timing drift,and satisfy the timing relationship of 5G NR.Finally,it puts forward contentionbased random access procedure of 5G NTN.

关 键 词：5G NTN 定时提前 随机接入过程 同步参考点 传播时延 

分 类 号：TN929.5[电子电信—通信与信息系统]