基于软件定义网络的卫星网络路由预置方法  

Satellite network routing preset methodbased on software-defined network

作　　者：孙延涛[1,2] 刘承昕 李琪[3] 宁金枝 SUN Yantao;LIU Chengxin;LI Qi;NING Jinzhi(School of Computer and Information Technology,Beijing Jiaotong University,Beijing 100044,China;Beijing Key Lab of Traffic Data Analysis and Minding,Beijing Jiaotong University,Beijing 100044,China;DFH Satellite Co.,Ltd.,Beijing 100094,China)

机构地区：[1]北京交通大学计算机与信息技术学院,北京100044 [2]北京交通大学交通数据分析与挖掘北京重点实验室,北京100044 [3]航天东方红卫星有限公司,北京100094

出　　处：《北京交通大学学报》2021年第2期111-118,134,共9页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家自然科学基金(61871026)。

摘　　要：由于卫星网络所拥有的节点负载有限、拓扑变化频繁、通信距离长等特点,常见的动态路由算法在卫星网络上存在路由无法收敛、丢包严重和传输延迟较大等问题.为此,本文提出了一种基于软件定义网络(Software-Defined Network,SDN)的卫星网络路由预置方法.利用卫星网络的运动规律性,由控制器根据网络拓扑变化情况预先计算路由路径,并在卫星链路断开前为相关卫星节点下发新的路由条目,卫星节点在拓扑发生变化后按照新的路由条目转发数据报文.实验表明:本文方法在180个节点的卫星网络中,端到端时延约为100 ms,丢包率约为0.3%,与OLSR相比,延迟和丢包率均降低了90%以上,可以较好地支持大规模星群系统的通信.Due to the limited node load,frequent topology changes,and long communication distances of satellite networks,common dynamic routing algorithms have many problems such as inability to converge routing,serious packet loss,and large transmission delays on satellite networks.This paper proposes a satellite network routing preset method based on Software-Defined Network(SDN).This method utilizes the movement regularity of the satellite network,the controller pre-calculates the routing path according to the change of the network topology,and issues a new routing entry for the relevant satellite node before the satellite link is disconnected.The satellite node follows new routing entry forwards data packets after the topology change.Experiments show that in a 180-node satellite network,the end-to-end delay of the proposed method is about 100 ms,and the packet loss rate is about 0.3%.Compared with OLSR,the delay and packet loss rate are both reduced by more than 90%.It could support the communication of large-scale constellation systems well.

关 键 词：卫星网络 软件定义网络 路由预置方法 路由算法 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]