软件定义天地一体化网络：架构、技术及挑战

[摘要] 提出了一种基于软件定义网络（SDN）的天地一体化网络架构，将控制平面和数据平面分离。该架构下，地面信息港和地球静止轨道卫星组成了多控制器结构的控制平面，将中轨、近地轨道卫星作为简单的转发设备，提供了更灵活的路由策略，更方便的网络配置以及更好的兼容性。同时，考虑到目前在卫星节点上部署网络设备的难度，提出了初期在地面部署控制器，之后逐步向静止轨道卫星扩展控制平面的演进思路。此外，还分析了这种架构面临的挑战。

[关键词] 天地一体化网络；SDN；多控制器；演进式

[Abstract] A space-terrestrial integrated network architecture based on software defined network(SDN) is proposed in this paper. In this architecture, (1) control plane and data plane are separated; (2) the terrestrial information station and geostationary orbit(GEO) satellites are combined as the control plane; and (3) medium earth orbit(MEO) & low earth orbit(LEO) satellites are regarded as simple forwarding devices. This architecture could provide more flexible routing strategies, more convenient network configuration and better compatibility. Meanwhile, considering the difficulty of deploying network devices on satellites, an evolutionary strategy is proposed, in which controllers are deployed in terrestrial stations at the present stage and extended to GEO satellites gradually. Moreover, the challenge of this space-terrestrial integrated network architecture is analyzed.

[Keywords] integrated space and terrestrial network; SDN; multiple controllers; evolutionary