摘要： 在空间信息网络大时空尺度和节点稀疏特性的环境下，传统网络的异构性会降低网络传输效率，星间通信过程易中断，无法充分利用已存在的异构节点，导致星间链路频繁切换，使得平均传输时延增大与服务质量降低。为此，以空间信息网络为背景、以软件定义网络架构为核心对Floodlight控制器模块进行改进，运用控制器实现IP包与ATM包之间相互转换的策略，提出一种基于网络有效性的路由算法。仿真结果表明，与传统空间信息网络模型架构和卫星网络架构相比，通过该算法改进后的SDHSN架构在单位时间片内网络平均传输时延降低约3.75%，吞吐量提升7.22%~11.49%。

关键词: 空间信息网络, 软件定义网络, 传输策略, 路由算法, 网络有效性

Abstract: In the environment of large spatial-temporal scale and sparse nodes of spatial information network,the heterogeneity of traditional networks decreases the efficiency of network transmission,and the inter-satellite communication process is easily interrupted.The existing heterogeneous nodes cannot be fully utilized,resulting in frequent switching of inter-satellite links,which makes an increase in average transmission delay and a decrease in QoS.Therefore,this paper takes the spatial information network as the background,and the Software Defined Networks(SDN) architecture as a core to improve the Floodlight controller module,so that the controller can realize the conversion strategy between IP packets and ATM packets.This paper proposes a Network Effectiveness based Routing Algorithm(NERA) for this strategy.Results of simulation experiments show that compared with traditional spatial information network model architecture and satellite network architecture,the average network delay of Software Defined Heterogeneous Satellite Network(SDHSN) architecture improved by the proposed algorithm is reduced by about 3.75% per unit time,and the throughput is increased by 7.22%~11.49%.

Key words: spatial information network, Software Define Network(SDN), transmit strategy, routing algorithm, effectiveness of network

中图分类号: 

• TP391