低轨星座网络多控制器动态部署研究
Research on Dynamic Placement of Multiple-Controllers in LEO Constellation Networks

LEO (Low Earth Orbit)星座网络凭借其全球覆盖能力，能够有效扩展和补充地面网络的不足，但其高速运动和拓扑结构快速变化为控制器的部署带来了巨大挑战。为应对LEO星座网络中动态拓扑的挑战，本文提出了一种基于区域划分的SDN多控制器选择与动态迁移方法，采用Voronoi区域划分，并引入动态评分机制，综合考虑卫星与种子点的距离、资源使用情况和卫星在区域内停留时间等因素，动态选拔最优控制器。此外，本文提出的控制器迁移策略，通过监测域内平均时延和控制器的资源消耗，确保控制器及时迁移，提升管理效率与稳定性。仿真实验表明，本文提出的SDN多控制器部署方法在降低传输时延方面优于现有方法，同时有效优化了控制器的资源使用率，更加适应LEO星座网络的频繁拓扑变化。
The LEO (Low Earth Orbit) constellation network, with its global coverage capability, can effectively expand and supplement the deficiencies of terrestrial networks. However, its high-speed movement and rapidly changing topology pose a huge challenge for the placement of controllers. To address the challenge of dynamic topology in LEO constellation networks, this paper proposes an SDN multi-controller selection and dynamic migration method based on regional division. It adopts Voronoi regional division and introduces a dynamic scoring mechanism. By comprehensively considering factors such as the distance between satellites and seed points, resource usage, and the residence time of satellites in the region to dynamically select the optimal controller. In addition, the controller migration strategy proposed in this paper ensures timely migration of controllers by monitoring the average delay within the domain and the resource consumption of the controller. Simulation experiments show that the SDN multi-controller deployment method proposed in this paper is superior to existing methods in reducing transmission delay. At the same time, it effectively optimizes the resource utilization rate of the controller, making it more adaptable to the frequent topological changes of LEO constellation networks.