基于海量用户属性的低轨卫星网络优化分组切换方法  

Optimized Group Handover Method for Low Earth Orbit Satellite Networks Based on Massive User Attributes

作　　者：杨兆瑞 张晨 张更新 YANG Zhaorui;ZHANG Chen;ZHANG Gengxin(School of Communications and Information Engineering,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,江苏南京210003

出　　处：《无线电工程》2024年第12期2850-2857,共8页Radio Engineering

基　　金：国家重点研发计划重点专项(2022YFB2902600);国家自然科学基金(61901230,U21A20450)。

摘　　要：随着低地球轨道(Low Earth Orbit, LEO)卫星通信系统设备的大规模部署,用户终端数量呈迸发式增长。然而卫星运动会导致服务间断,大量用户需要同时发生切换,产生了大量的信令开销,致使网络性能下降。针对以上问题,提出了一种基于海量用户的属性优化分组方式的多星切换方法。该方法根据用户服务卫星向网络发送的满足用户通信需求的切换卫星信息,对用户考虑其在波位内相对位置和切换需求带宽等属性进行初始分组。通过考虑切换成功率、负载均衡和切换时延等因素,调度组内用户和用户组,优化用户的分组切换方法。对于信令交互流程,分析了优化分组切换方法对比谱聚类分组切换方法和单用户切换方法的信令开销。仿真结果表明,优化后的分组切换方法能够有效提高切换成功率,改善卫星的负载均衡,降低切换时延,减少部分节点间交互的信令,从而降低切换的信令开销。With the large-scale deployment of Low Earth Orbit(LEO)satellite communication systems,there has been an explosive growth in user terminal numbers.However,satellite motion can cause service interruptions,leading to a scenario where a large number of users need to undergo handover simultaneously,resulting in significant signaling overhead and decreased network performance.To address these issues,a multi-satellite handover method based on optimized grouping of massive users'attributes is proposed.This method initially groups users based on attributes such as relative positions within the beam and switch demand bandwidth,using the switch satellite information satisfying user communication needs sent to the network by the serving satellite.By considering factors like handover success rate,load balancing,and handover delay,the method optimizes user grouping handover by scheduling users within groups and user groups.The signaling overhead of the optimized grouping handover method compared to spectral clustering grouping handover method and single-user handover method is analyzed in terms of signaling interaction process.Simulation results demonstrate that the optimized grouping handover method effectively improves handover success rate,enhances satellite load balancing,reduces handover delay,and decreases signaling overhead by minimizing signaling interactions between nodes during handover.

关 键 词：低轨卫星 多星覆盖 星间切换 分组切换 

分 类 号：TN927.2[电子电信—通信与信息系统]