摘要
基于低地球轨道和静止地球轨道(low Earth orbit&geo-synchronous Earth orbit,LEO&GEO)双层卫星网络结构,对其覆盖特性和星间链路(inter-satellite-link,ISL)特性进行了仿真分析。提出了分层分簇的管理方法,只有主簇头与GEO卫星有连接关系,简化了互联关系的复杂性。在该卫星组网结构中,利用星座网络拓扑的特点,提出一种负载均衡的动态路由算法,综合考虑了路径时延和ISL链路负载。与单层卫星网络相比,双层卫星网络可以更加均匀地分配通信量,仅在低层LEO卫星路由跳数超出一定阈值或者卫星网络链路利用率超过某个门限范围时,才利用上层GEO卫星进行中转传输,仿真结果表明,所提路由算法可以实现更低的时延、延迟抖动以及更优的服务质量性能。
The coverage and inter-satellite link（lSL） performances of low earth orbit 8. geo synchronous Earth orbit （LEO＆GEO） double-layered satellite network are first introduced in detail. Then layering and clus- tering level management is proposed, which can simplify the ISL connectivity because just the head satellite of a cluster has the connectivity to GEO satellite. Under the network model, a dynamic routing algorithm which considers path delay and ISL link load is proposed. Compared with single layer satellite networks, multilayer satellite networks distribute traffic more evenly and they can distribute traffic through GEO satellite just when the route hops exceed the threshold or the network link utility exceeds the threshold. Sinmlation results show that the proposed routing algorithm results in low delay, small delay jitter and provides excellent performance for the quality of service.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2013年第9期1966-1973,共8页
Systems Engineering and Electronics
基金
上海市青年自然科学基金(12ZR1450000)资助课题
关键词
低地球轨道和静地球轨道星座
分层分簇
负载均衡
链路利用率
拥塞避免
触发更新
low Earth orbit
geo synchronous Earth orbit （LEO^GEO） constellation
layering level andclustering level management
load balancing
link utilization
congestion avoidance
event-triggered update
