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为了解决目前星载交换系统中路由交换技术的协议开销大、信令复杂、服务质量(QoS)保障能力弱等问题,提出一种基于软件定义网络(SDN)技术的星载交换系统组网架构,对卫星通信SDN控制器和星载SDN交换机的系统结构和功能模块进行了初步设计,实现了星载交换系统控制平面与转发平面的分离,为进一步开展相关研究打下了基础。通过实验仿真,分析比较了SDN星载交换系统和传统星载交换系统的系统负荷和路由收敛时间。结果表明,SDN星载交换系统在降低星载计算能力需求和有效提高拓扑结构稳定性上具有明显优势,可以有效减少传统星载交换系统的有效负荷,优化卫星信道资源利用率,提高卫星通信网络的QoS保障能力。
In order to solve the problems such as large protocol overhead, complex signaling and weak QoS guarantee capability in the current satellite-based switching system, this paper proposes a network-based switching architecture based on software defined network (SDN) , Designed the system structure and function module of SDN controller and SDN switchboard of satellite communication, and realized the separation of control plane and forwarding plane of satellite-based switching system, laying the foundation for further research. Through experimental simulation, the system load and routing convergence time of SDN satellite-based and traditional space-borne switching systems are analyzed and compared. The results show that the SDN system has obvious advantages in reducing the demand of on-board computing capacity and effectively improving the stability of the topology. It can effectively reduce the payload of the traditional space-borne switching system, optimize the utilization rate of satellite channels, and improve the satellite communication network QoS guarantee ability.