低轨卫星网的用户位置管理技术研究  

Study on the technology of UE location management for LEO-satellite Non-Terrestrial Networks

作　　者：耿心怡 陈睿 王文鼐[1,2] GENG Xinyi;CHEN Rui;WANG Wennai(School of Communications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;Key Laboratory of Broadband Wireless Communication and Sensor Network Technology,Ministry of Education,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[1]南京邮电大学通信与信息工程学院,南京210003 [2]南京邮电大学宽带无线通信与传感网技术教育部重点实验室,南京210003

出　　处：《智能计算机与应用》2024年第10期222-226,共5页Intelligent Computer and Applications

基　　金：江苏省研究生科研与实践创新计划资助项目(KYCX21_0724)。

摘　　要：低轨卫星通信系统作为非地面网络的典型代表,凭借其低传输时延、低传输损耗、可全球覆盖和较强的抗毁性等特点成为全球移动通信系统的重要组成部分。位置管理作为移动性管理的一部分,关系到整个系统的性能。然而低轨卫星的高速运动为位置管理技术的发展带来了诸多挑战,同时海量用户的接入使得卫星跟踪和定位用户的信令开销猛增。本文针对低轨卫星的运动特征,提出了基于星下点轨迹预测的位置区设计方法,定义波束跟踪区列表作为位置管理的基本单元,最后基于纳什议价法构建最优化模型,使用Matlab平台进行代码编写和仿真验证,在位置更新和寻呼的信令开销之间达到平衡。Low Earth Orbit(LEO)satellite communication system,as a typical representative of Non-Terrestrial Networks(NTN),has emerged as a crucial component of global mobile communication systems for its short propagation delay,low transmission loss,worldwide coverage and high robustness.As a key technology in mobility management,location management has a profound impact on the performance of the entire network.However,the rapid movement of LEO satellites poses great challenges to the development of location management technology.Additionally,the access of a mega number of UEs increases the signalling overhead for the satellite to track and locate UEs.This research proposes the location area division strategy based on the prediction of sub-satellite point trajectory and defines Beam Tracking Area List(BTAL)as the basic unit for location management.An optimization problem is modelled based on the Nash bargaining solution to achieve a trade-off point between location update and the signalling overheads of paging.

关 键 词：低轨卫星 位置管理 位置更新 寻呼 信令开销 Matlab 

分 类 号：TN927[电子电信—通信与信息系统]