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出 处:《计算机应用研究》2015年第11期3375-3378,共4页Application Research of Computers
基 金:国家"863"计划资助项目(2012AA012704)
摘 要:卫星间的链路具有间歇连通、传播时延长等特点,使得基于端到端持续连通的互联网协议无法适应星间链路延迟容忍环境,造成数据传输效率低下的问题。为提高传输效率,设计了一种基于局部连通图的延迟容忍数据转发算法。该算法首先分析同层和层间卫星链路的建立条件,计算卫星链路的连通时间,建立链路的局部连通图,然后在局部连通图内选择中继节点进行转发。仿真结果表明,与现有同类型的CGR、PER和CVDFA算法相比,该算法在星间链路环境中报文投递率提高了4%以上、报文平均时延和网络开销降低超过15%,提高了传输效率。With satellite links have characteristics of intermittent connectivity, extend propagation, Internet protocol cannot adapt to the delay tolerant environment of satellite links, resulting in data transmission inefficiencies. To solve this problem, this paper presented a delay tolerant data forwarding algorithm based on local-connected-graph. The algorithm analyzed the established conditions in inter-satellite links and inter-orbital links, computed connected time, established local-connected-graph, then selected the relay node in local-connected-graph and forwards. Simulation resuhs show that the algorithm increases packet delivery probability by more than 4% , lowers the average latency and overhead ratio by more than 15 % , comparing with the existing same types algorithm CGR, PER and CVDFA in satellite links environment,improving the transmission efficiency.
分 类 号:TP393.04[自动化与计算机技术—计算机应用技术] TP301.6[自动化与计算机技术—计算机科学与技术]
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