中文摘要：

从改善LEO／MEO双层卫星网络拓扑结构稳定性的角度出发，该文提出了3种基于集中重建的层间星际链路建立策略。新策略的基本思想是通过强制所有层间星际链路在相同时间进行重建来大幅减少网络拓扑的重构次数。仿真结果表明，与原有的策略相比，该文提出的策略能够以可接受的代价提高LEO／MEO双层卫星网络拓扑结构的稳定性。

英文摘要：

Three new merged-reconstruction-based Inter-Layer Inter-Satellite Link（ILISL） establishment strategies are proposed to reduce the number of network topology reconfiguration and enhance the topology structure stability of the two-tier Low Earth Orbit （LEO）/Medium Earth Orbit （MEO） satellite networks. These proposed strategies decrease the number of the network topology reconfiguration by forcing reconstruction of all ILISL at the same time. Simulation results show that the number of the network topology reconfiguration can be reduced greatly with proposed strategies. Hence the topological stability of the LEO/MEO two-tier satellite networks can be improved with acceptable cost.