中文摘要：

针对空间信息网络结构复杂、拓扑动态以及空间通信时延大等特点，提出了一种基于软件定义网络（SoftwareDefinedNetworking，SDN）的空间信息网络架构。在该架构中，地面核心网作为骨干网，多种邻近卫星构成接入网，整个网络通过多域控制器与单域控制器协同控制的方式实现空间信息网络的统一组网。同时，针对空间信息网络拓扑动态变化易导致通信中断的特点，提出了基于星际光互联的多路径承载策略，并对该策略进行了系统仿真。仿真结果表明，相比于一般的保护策略，多路径承载策略具有更低的阻塞率，且随着该策略中保护级别系数的增加，网络的阻塞率也相应增大。

英文摘要：

Due to the characteristics such as complex structure,dynamic topology and long communication delay of space informa- tion networks,a novel structure for space networks based on Software Defined Network （SDN） is proposed.The architecture is composed of multiple sub-networks,among which the terrestrial core network is used as backbone network,and a variety of satelfitcs are used as access networks.The space information network is controlled by combining the single-domain controller and the multi-domain controller. Meanwhile,according to the characteristic that the changing topology leads to the interrupt of communication, a multi-path algorithm is proposed.The simulation results show that with the increasing value of protection factor, the network blocking rate increases.Meanwhile, the blocking rate of the multi-path carrying strategy is lower than that of the general protection strategy.