基于SDN和虚拟拓扑的天基网络路由算法

Routing algorithm for space-based network based on SDN and virtual topology

针对天基网络的时变拓扑结构给网路管理和路由设计带来的难题,综合考虑GEO卫星和LEO卫星的优势,建立了一种基于软件定义网络(SDN)架构的天基网络模型,提出了一种基于虚拟拓扑的包含必经节点的天基网络路由算法(VTPN)。通过改进时间片划分策略,提高了计算效率,通过必经节点的设定,改善了链路拥塞问题。仿真结果表明:SDN架构下的VTPN算法与其他算法相比,网络链路利用率和负载均衡性能提高了约50%,丢包率降低了约20%。

Aiming at the challenges brought by time-varying topology structure of space-based networks to network management and routing design,considering the advantages of GEO satellites and LEO satellites,a space-based network model based on SDN architecture is established,a virtual topology-based approach is proposed.A space-based network routing algorithm which contains required node that must pass through the nodes,(VTPN)is proposed.By improving the time slice division strategy,the computational efficiency is improved,and the link congestion problem is improved by setting of passing through node.The simulation results show that compared wiTHother algorithms,the VTPN algorithm under the SDN architecture improves the network link utilization and load balancing performance by about 50%,and the packet loss rate decreases by about 20%.