摘要
单层卫星网络由于轨道高度和覆盖能力的不同,以至构成通信的单层系统往往不能满足不同业务服务质量的需求。分析了Walkerdelta型星座构建多层卫星通信网络的拓扑结构和ISL性能,提出了在统计分布模型下的多层卫星自适应路由策略,综合考虑了路径时延和ISL链路负载。仿真结果表明了多层网络自适应路由策略能够更加有效地分配网络通信量,网络具有较小的丢包率、网络平均归一化链路负载和特定路径综合路径权重,有利于降低网络平均阻塞概率和特定路径阻塞概率,获得更高的可靠性,较传统的单层非自适应路由更加有效、可靠。
The characteristics of multi-coverage of multilayer satellite networks make sure of good validity and reliability of the space-based networks. Walker delta type constellation guarantees permanent inter satellite links between satellites in the same layer and provides nonpermanent inter orbit links, both of which make an autonomic satellite backbone. Under statistic model of traffic flow from global perspective, multilayer satellite networks consider path delay and ISL link weight adopt adaptive routing strategy and bear more reliability. Compare with single layer satellite networks, multilayer satellite networks distribute traffic more evenly and have smaller percent of lost packet, network normalized link load and total path weight of special path, which do favor to decreasing percent of blocking probability of network and the special path.
出处
《通信学报》
EI
CSCD
北大核心
2006年第8期119-128,共10页
Journal on Communications
基金
信息产业部电子科学研究院预研基金资助项目(41306070201)~~
关键词
卫星通信
多层卫星网络
星间链路
自适应路由
satellite communication
multi layer satellite networks
inter satellite link
adaptive routing
