巨型LEO星座的时不变拓扑与航点路由设计  

Time-Invariant Topology and Waypoint Routing in Mega LEO Constellations

作　　者：李公顺 陈睿[1] 吴炜[1] 王文鼐[1] LI Gongshun;CHEN Rui;WU Wei;WANG Wennai(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,江苏南京210003

出　　处：《移动通信》2024年第9期147-152,共6页Mobile Communications

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：LEO卫星网是6G空地一体通信的重要组成部分,在带来低成本广覆盖等应用优势的同时,面临高动态和快切换等技术挑战。虽然卫星规律运动,星座图时变性也有章可循,但天基网的规模远高于地面网,不能简单延用因特网现有路由技术。综合应用快照变换和虚拟节点法,以卫星及星际链路为参考系,通过3步位置变换和极区收缩处理,得到巨型LEO星座的时不变拓扑,证明完全格网的适用性,并应用航点路由机制设计了本地卫星固定式路由算法,进一步给出了格网星座与循环图的同构性以及结构优化的探索方向。LEO satellite networks are a critical component of 6G space-ground integrated communication,offering advantages such as low cost and wide coverage,but also presenting technical challenges like high dynamics and frequent handovers.Although satellite motion follows predictable patterns and the time-varying nature of constellations is regular,the large scale of spacebased networks far exceeds that of terrestrial networks,making traditional Internet routing technologies inadequate.By applying snapshot transformations and virtual node methods,using satellites and inter-satellite links as reference frames,a time-invariant topology for mega LEO constellations is derived through a three-step position transformation and polar region contraction process.The suitability of a complete grid topology is demonstrated,and a waypoint routing mechanism is employed to design a local satellite fixed-routing algorithm.The isomorphism between grid constellations and cyclic graphs is also established,providing insights for further structural optimization.

关 键 词：LEO星座 天基网络 参照系 格网拓扑 航点路由 

分 类 号：TN929.5[电子电信—通信与信息系统]