中文摘要：

针对极轨道星座低轨（LEO，LowEarthOrbit）卫星通信系统路由存在的切换处理和差异化服务能力不足问题，提出了一种分布式与源路由相结合的区分服务路由机制。利用网络拓扑变化特征、地面热点区域模型与星际链路拥塞状态等局部信息分布式转发尽力交付业务，在此基础上综合星地、星际链路可用时长和业务特点设计源路由算法转发时延、带宽敏感业务。仿真结果表明，该机制的切换处理与区分服务能力有明显提升，信令开销、端到端时延、丢包率和时延抖动优于传统方法。

英文摘要：

Exiting routing schemes for Polar-orbit LEO （Low Earth Orbit） satellite communication systems have some drawbacks in handover handling and differentiated service. Novel differentiated service-oriented routing mechanisms are proposed combining distributed routing with source routing method. Best-effort delivery traffic is distributedly forwarded considering topological change charac- teristic, hot spot model on the earth＇s surface and inter-satellite-link congestion. Moreover, delay- and bandwidth-sensitivity traffic are transmitted employing source routing based on traffic character- istic and the duration of user-data-link and inter-satellite-link. Simulation results demonstrate that the proposed mechanisms perform better in terms of handling handover and providing differentiated serv- ice, and have lower signaling overhead, end-to-end delay, packet loss ratio and delay jitter when compared to other routing schemes.