极轨道LEO卫星通信系统区分服务路由机制  

Differentiated service-oriented routing mechanisms for polar-orbit LEO satellite communication systems

作　　者：饶元[1,2,3] 元昌安 朱军[1] 傅雷扬[1] 邵星[3] 王汝传[3] 

机构地区：[1]安徽农业大学信息与计算机学院,安徽合肥230036 [2]科学计算与智能信息处理广西高校重点实验室,广西南宁530023 [3]宽带无线通信与传感网技术教育部重点实验室,江苏南京210003

出　　处：《广西大学学报（自然科学版）》2013年第2期351-358,共8页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(61203217);安徽省高校省级自然科学研究重点项目(KJ2012A102);广西高校重点实验室资助项目(GXSCIIP201215;GXSCIIP201216)

摘　　要：针对极轨道星座低轨(LEO,Low Earth Orbit)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。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.

关 键 词：卫星通信系统 拓扑 网络路由 机制 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]