摘要
研究了星间链路(ISL)约束及区域不均匀性对LEO移动通信星座的路由时延和呼叫阻塞概率(CBP)的影响。构建了完整而精确的LEO移动通信星座模型。考虑星间链路约束,完成了星间可视计算,得到了星间链路表和链路时延;从覆盖区域和覆盖时间两方面考虑区域不均匀性,完成了星座覆盖计算,并提出了一种根据星座覆盖估算链路呼叫阻塞的方法;利用改进的遗传算法(GA)完成了路由时延和呼叫阻塞的同时优化,得到了最佳路由。仿真结果表明:星间链路约束及区域不均匀性影响到路由的有效性和安全性,二者在路由优化中的应用可以大大改善路由的性能。
The inter-satellite link（ISL） constraints and regional heterogeneity influence on routing delay and call blocking probability（CBP） was studied.First,a complete and accurate model of LEO mobile communication constellation was constructed.On this basis,the inter-satellite visual computing was completed with taking the constraints of ISL into account,which helped to obtain the inter-satellite link table and link delay.Also,from both the coverage area and the time to consider the regional heterogeneity,the coverage calculation was completed.Moreover,a new method was presented to estimate the link call blocking probability from the coverage.The best route was received via the improved genetic algorithm（GA） which optimized the routing delay and call blocking probability at the same time.The simulation results show that the inter-satellite link constraints and regional heterogeneity have large effect on routing validity and security,and their application in the routing optimization is advantageous to improve routing performance.
出处
《系统仿真学报》
CAS
CSCD
北大核心
2011年第B07期219-223,227,共6页
Journal of System Simulation
关键词
通信星座
星间链路
区域不均匀
路由
影响
communication constellation
ISL
regional heterogeneity
routing
effects
