基于SDN的卫星网络最短路径优化算法研究

Research of SDN-Based Space Network Shortest Path Optimization Algorithm

摘要: 天地一体化网络正在成为下一代网络的发展新趋势，SDN和NFV正在成为集成卫星网络和地面网络的主要渠道。SDN具有转控分离的特性，可以从整个网络配置资源，实现卫星网络的优化。本文在基于SDN的天地一体化网络背景之下，针对卫星网络流量不均、拥塞等问题，将扩展最短路径优化算法进行改进，并应用于天地卫星网络中，在多层卫星架构中使用LEO卫星作为支持OpenFlow的SDN转发交换机，GEO同步卫星作为控制器控制全局网络，并对相关网络指标进行了性能分析和仿真。与现有卫星路由算法的研究相比，本算法降低卫星网络端到端时延与丢包率。

Abstract: Space-ground integrated network is becoming the new development trend of the next generation network, and SDN and NFV are becoming the main channels for integrating satellite network and ground network. SDN has the characteristics of transfer and control separation, which can allocate resources from the whole network and realize the optimization of satellite network. In this paper, under the background of heaven and earth integration network based on SDN, the satellite network traffic, congestion, using OpenFlow switch as forwarding plane in LEO satellite architecture, GEO synchronous satellite as a controller, will extend the shortest path optimization algorithm applied to heaven and earth satellite network, and the related network index performance analysis and simulation. Compared with the existing satellite routing algorithm, this algorithm reduces the end-to-end delay and packet loss rate of satellite network.