摘要
在面向6G的移动通信网络中,低轨卫星网络(LEO,Low Earth Orbit)运行高度低、时延小,可大范围部署实现全球广域低时延通信。当前低轨卫星星座正朝着多层轨道面发展,多层轨道的跨层链路增加了数据传输路径,但跨层轨间链路的频繁通断,增大了多层LEO网络层间路由选择的难度。为此提出了一种面向6G移动通信的多层LEO卫星网络路由算法。首先建立跨层链路,面向端到端传输时延和可靠性需求,分析影响跨层轨间链路频繁通断的因素,基于LEO卫星网络虚拟位置思想,选择卫星节点对建立可靠跨层链路;然后实现路由选择,基于所建立的跨层星间链路,采用时空演化图模型刻画动态网络拓扑,设计最短路径算法计算最佳传输路径。最后,构建三层卫星网络场景对所提算法进行仿真验证。结果表明,相对于现有方法,所提算法在端到端时延和可靠性均有明显提升。
In mobile communication networks oriented towards 6G,Low Earth Orbit(LEO)satellite networks,with their low operational altitude and reduced latency,are capable of widespread deployment for global wide-area low-latency communication.Current LEO satellite constellations are evolving towards multi-layer orbital planes,where inter-layer links increase data transmission paths.However,the frequent on-off switching of inter-layer inter-orbital links complicates routing decisions in multi-layer LEO networks.To address this,a routing algorithm for multi-layer LEO satellite networks in 6G mobile communications is proposed.Firstly,inter-layer links are established,taking into account the end-to-end transmission latency and reliability requirements.Factors influencing the frequent disruptions of inter-layer inter-orbital links are analyzed,and reliable inter-layer links are established using the concept of virtual positioning in LEO satellite networks.Next,for routing selection,a spatio-temporal evolution graph model is employed to depict the dynamic network topology,and the shortest path algorithm is designed to calculate the optimal transmission route.Finally,a three-layer satellite network scenario is constructed to simulate and validate the proposed algorithm.The results demonstrate significant improvements in end-to-end latency and reliability compared to existing methods.
作者
徐小涛
赵国锋
韩珍珍
蔡茹意
徐川
XU Xiaotao;ZHAO Guofeng;HAN Zhenzhen;CAI Ruyi;XU Chuan(School of Information Communication,National University of Defense Technology,Wuhan 430010,China;School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)
出处
《移动通信》
2024年第1期56-64,87,共10页
Mobile Communications
基金
中国博士后科学基金资助项目“面向超密集低轨卫星网络的高效多播路由机制研究”(2023MD734136)
宜宾市引进高层人才项目“云端协同的移动终端内生安保技术及应用”(2022YG05)。
关键词
低轨卫星网络
跨层轨间链路
多属性决策
路由算法
Low Earth Orbit Satellite Network
inter-layer inter-orbital link
multi-attribute decision making
routing algorithm
