空间DTN网络下的转发决策方法
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摘要
空间DTN网络采用存储转发机制进行数据传输,基于LTP红段来提供可靠传输以及LTP绿段或UDP等提供不可靠传输。如何灵活地利用可靠方式和不可靠方式进行数据传输,成为研究热点。提出一种基于历史重传率的转发决策方法,在链路质量较好时,采用不可靠方式进行数据传输,可以提高效率;当链路质量变差时,可以考虑采用可靠传输来提高传输成功率,并搭建了典型场景进行了试验,试验结果表明,在近地空间通信场景中,即信道误码率10~(-7)～10~(-6)之间时,该方法相较传统IPN方法,传输延迟时间更短,转发效率更高。
Space DTN network transfers data based on store-and-forward mechanism,using Red Segment of LTP protocol for reliable transform and using Green Segment of LTP protocol or UDP protocol for unreliable transform.It becomes a hot research that how to take advantage of reliable and unreliable method to transfer data flexibly.It proposed a forwarding decision method based on historical retransmission rate,using unreliable method to improve efficiency when link quality changes better and using reliable method to improve the successfully delivery rate when link quality changes worse.We have established typical experimental environment.And experiment results indicate that in near earth space scenario,i.e.BER between 10~(-6)～10~(-7).Compared with traditional IPN forward method,our method has shorter transmit delay time and higher forward efficiency.
Space DTN network transfers data based on store-and-forward mechanism,using Red Segment of LTP protocol for reliable transform and using Green Segment of LTP protocol or UDP protocol for unreliable transform.It becomes a hot research that how to take advantage of reliable and unreliable method to transfer data flexibly.It proposed a forwarding decision method based on historical retransmission rate,using unreliable method to improve efficiency when link quality changes better and using reliable method to improve the successfully delivery rate when link quality changes worse.We have established typical experimental environment.And experiment results indicate that in near earth space scenario,i.e.BER between 10~(-6)～10~(-7).Compared with traditional IPN forward method,our method has shorter transmit delay time and higher forward efficiency.
引文
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[13] 宋蒲斌,孙贺,王兆俊,等.基于DTN的高分卫星传感器网络性能优化研究[J].计算机工程,2014,42(8):46-51.
[14] RFC5050,Bundle Protocol Specification[S].Virginia,USA:Internet Society,2007.
[15] RFC6257,Bundle Security Protocol Specification[S].Virginia,USA:Internet Society,2011.
[16] RFC5326,Licklider Transmission Protocol Specification[S].Virginia,USA:Internet Society,2008.
[17] CCSDS 727.0-B-4,CCSDS FILE DELIVERY PROTOCOL (CFDP)[S].Virginia,USA:Internet Society,2007.
[18] BURLEIGH S.Interplanetary Overlay Network (ION) Design and Operation v1.13[R].California Institute of Technology:Pasadena:Jet Propulsion Laboratory,2011.
[19] Interplanetary Overlay Network (ION).Jet Propulsion Laboratory California Institute of Technology,CA[online at https://sourceforge.net/projects/ion-dtn],December,2018.
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[2] FALL K.A Delay-tolerant Network Architecture for Challenged Internets[C]//In Proceedings of the 2003 Conference on Applications,Technologies,Architectures,and Protocols for Computer Communications,Karlsruhe,Germany,2003:27-34.
[3] BURLEIGH S,HOOKE A,TORGERSON L,et al.Delay-tolerant Networking:Approach to Interplanetary Internet[J]mmunications Magazine,2003,41(6):128-136.
[4] RFC4838,Delay-tolerant Networking Architecture[S].Virginia,USA:Internet Society,2007.
[5] 陈运军.空间网络技术发展分析与建议[J].飞行器测控学报,2016,35(2):153-162.
[6] 聂宇雷,彭锋彬,张更新,等.深空通信中容迟容断网络协议体系应用研究[J].无线电通信技术,2016,42(3):22-25.
[7] 杨辉,蔚保国,王正勇,等.空间信息网络时间同步技术研究[J].无线电工程,2018,48(3):173-177.
[8] 徐键卉,杜昊阳,雷旺春,等.喷泉编码在DTN网络中的应用研究[J].无线电通信技术,2016,42(3):110-114.
[9] 马蓓蕾,王贵竹,朱妍娟,等.基于缓冲区占用率的DTN散发等待路由算法[J].计算机工程,2015,41(10):88-93.
[10] 王旭,何荣希.延迟容忍网络中一种多信息融合的改进概率路由算法[J].电讯技术,2014,54(11):1569-1575.
[11] 张滔,徐建波.基于位置预测的社会性DTN路由算法[J].计算机工程与应用,2014,50(18):94-98.
[12] 王挺,张玉梅.一种基于DTN的震后救援路由新策略[J].计算机工程与应用,2017,53(22):71-76.
[13] 宋蒲斌,孙贺,王兆俊,等.基于DTN的高分卫星传感器网络性能优化研究[J].计算机工程,2014,42(8):46-51.
[14] RFC5050,Bundle Protocol Specification[S].Virginia,USA:Internet Society,2007.
[15] RFC6257,Bundle Security Protocol Specification[S].Virginia,USA:Internet Society,2011.
[16] RFC5326,Licklider Transmission Protocol Specification[S].Virginia,USA:Internet Society,2008.
[17] CCSDS 727.0-B-4,CCSDS FILE DELIVERY PROTOCOL (CFDP)[S].Virginia,USA:Internet Society,2007.
[18] BURLEIGH S.Interplanetary Overlay Network (ION) Design and Operation v1.13[R].California Institute of Technology:Pasadena:Jet Propulsion Laboratory,2011.
[19] Interplanetary Overlay Network (ION).Jet Propulsion Laboratory California Institute of Technology,CA[online at https://sourceforge.net/projects/ion-dtn],December,2018.
[20] MCGOWAN J F.Video Technologies for Mars[M].Lakewood,Colorado,USA:In Proceedings of the Second International Convention of the Mars Society,2000.