中文摘要：

针对卫星通信系统配置更新不灵活、管理复杂等问题,将软件定义网络框架引入卫星网络。简要介绍基于SDN的星地混合网络架构,分析SDN架构中的南向接口协议在卫星网络中的适用性。针对卫星交换节点特性与功能,扩展和增强南向接口OpenFlow协议的功能,以利用多流表架构实现卫星节点多粒度交换,增加对微波端口特性的支持,通过控制器实时获取卫星性能参数,达到对卫星网络节点的灵活配置。

英文摘要：

In view of inflexible configuration update and complex management of satellite communication system, the softwaredefined network （ SDN ） framework is introduced into satellite networks. This paper briefly introduces the terrestrial satellite hybridnetwork architecture based on SDN, and analyzes the applicability of southbound interface protocol in SDN architecture to satellitenetworks. Based on characteristics and functions of satellite switching nodes,the function of southbound interface OpenFlow protocol isextended and enhanced to realize satellite nodes multi-granularity switching by taking advantage of multi-table architecture. Additionally,the support for microwave port characteristics is added, which enables the real-time acquisition of satellite performance parametersthrough a controller and achieves flexible configuration of satellite network nodes.