LEO卫星网中MPLS协议体系及其实现方案

由于卫星网拓扑时变的特性,使得现有的多协议标签交换(MPLS)技术难以在卫星网中有效地运行。以铱(Irid ium)系统为例,首先分析低轨卫星网(LEO)中星际链路的变化情况。针对卫星网具有频繁断接性和传输大时延等特点,将基于MPLS技术的LEO卫星网系统进行功能模块的划分,并重点对MPLS协议中的标签设计、信令协议选择、标签交换路径(LSP)的切换等问题进行仿真,同时提出相应的改进方案。

The Framework of MPLS Protocol for LEO Satellite Networks and It's Implementation

Due to the change of satellite constellation networks topology,it is very difficult to operate the multiprotocol label switching(MPLS) in satellite networks directly.In this paper,take the Iridium system for example,the intersatellite link performance is analyzed.The MPLS based satellite networks operate with frequent handoffs and the signal transmission is accompanies with a certain long delay.So,the functions of the MPLS based satellite network are resolved in sections.Three important focus factors in the MPLS protocol are analyzed and simulated,including the design of label,the comparison of signaling protocols,and the handovers of label switching path(LSP).Some modification are proposed to improve the performance of the satellite networks.