面向深空通信的LTP异步加速重传策略
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摘要
针对LTP会话中链路利用率不高的问题,本文通过改进会话传输机制,提出了一种面向未来深空通信的LTP异步加速重传策略。在对LTP会话传输过程建模分析的基础上,仿真验证了理论模型的正确性。为加速启动重传过程,采用了一种由接收端触发的异步加速重传方法,对异步加速重传过程建模,并给出了平均文件传输时间的表达式。在地月、地火场景中比较分析了改进策略的性能。结果表明异步加速重传策略可有效提高数据传输效率,非常适用于极长距离、高误码率的深空通信场景。
Aiming at the problem of insufficient link utilization in a session transmission of LTP protocol,a LTP asynchronous accelerated retransmission strategy is proposed by improving the session transfer mechanism for future deep space communications. Based on the analysis of LTP session transmission modeling,the theoretical model is validated by simulation. An asynchronous accelerated retransmission method triggered by receiver is used to accelerate start-up of retransmit process. The process of asynchronous accelerated retransmission is modeled and the expression of expected file delivery delay is derived. The improved strategy is analyzed by comparison under Earth-Moon and Earth-Mars scenarios. Results show that asynchronous accelerated retransmission strategy can improve data transmission efficiency effectively and especially favors the deep-space scenarios characterized by extremely long link and high bit error rate.
Aiming at the problem of insufficient link utilization in a session transmission of LTP protocol,a LTP asynchronous accelerated retransmission strategy is proposed by improving the session transfer mechanism for future deep space communications. Based on the analysis of LTP session transmission modeling,the theoretical model is validated by simulation. An asynchronous accelerated retransmission method triggered by receiver is used to accelerate start-up of retransmit process. The process of asynchronous accelerated retransmission is modeled and the expression of expected file delivery delay is derived. The improved strategy is analyzed by comparison under Earth-Moon and Earth-Mars scenarios. Results show that asynchronous accelerated retransmission strategy can improve data transmission efficiency effectively and especially favors the deep-space scenarios characterized by extremely long link and high bit error rate.
引文
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[18]Wu H,Li Y,Jiao J,et al.LTP Asynchronous Accelerated Retransmission Strategy for Deep Space Communications[C]//IEEE International Conference on Wireless for Space and Extreme Environments,Aachen,2017:99-104.
[2]董光亮,崔健雄,李海涛,等.物理层网络编码在深空通信中的应用展望[J].电子技术应用,2016,42(5):21-23.(Dong G L,Cui J X,Li H T,et al.ASurvey on Application of Physical Layer Network Coding in Deep Space Communication[J].Application of Electronic Technique,2016,42(5):21-23.)
[3]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.(Nie Y L,Peng F B,Zhang GX,et al.Research on Application of DTN Protocol Architectures in Deep Space Communication[J].Radio Communications Technology,2016,42(3):22-25.)
[4]叶建设,宋世杰,沈荣骏.深空通信DTN应用研究[J].宇航学报,2010,31(4):941-949.(Ye J S,Song S J,Shen R J.Research on DTN for Deep Space Communications[J].Journal of Astronautics,2010,31(4):941-949.)
[5]Consultative Committee for Space Data Systems.CCSDSBundle Protocol Specification[R].CCSDS 734.2-B-1,Blue Book,September 2015.
[6]Consultative Committee for Space Data Systems.Licklider Transmission Protocol(LTP)for CCSDS[R].CCSDS734.1-B-1,Blue Book,Issue 1.May 2015.
[7]Yang Z,Wang R,Yu Q,et al.Analytical Characterization of Licklider Transmission Protocol(LTP)in Cislunar Communications[J].IEEE Transactions on Aerospace and Electronic Systems,2014,50(3):2019-2031.
[8]Wang R,Burleigh S C,Parikh P,et al.Licklider Transmission Protocol(LTP)-based DTN for Cislunar Communications[J].IEEE/ACM Transactions on Networking,2011,19(2):359-368.
[9]Shi L,Jiao J,Sabbagh A,et al.Integration of ReedSolomon Codes to Licklider Transmission Protocol(LTP)for Space DTN[J].IEEE Aerospace&Electronic Systems Magazine,2017,32(4):48-55.
[10]Gu S,Jiao J,Yang Z,et al.RCLTP:A Rateless Coding-based Licklider Transmission Protocol in Space Delay/Disruption Tolerant Network[C]//International Conference on Wireless Communications&Signal Processing.IEEE,2013:1-6.
[11]王洋,杨宏,陈晓光,等.深空通信LTP传递时延的理论建模及试验验证[J].系统仿真学报,2017,29(3):479-486.(Wang Y,Yang H,Chen X G,et al.Theoretical Model and Validation of Delivery Time of LTP in Deep Space Communication[J].Journal of System Simulation,2017,29(3):479-486.)
[12]Yu Q,Burleigh S C,Wang R,et al.Performance Modeling of Licklider Transmission Protocol(LTP)in Deepspace Communication[J].IEEE Transactions on Aerospace and Electronic Systems,2015,51(3):1609-1620.
[13]王洋,杨宏,陈晓光,等.面向深空通信的DTN网络跨层包大小的优化设计[J].宇航学报,2017,38(5):533-541.(Wang Y,Yong H,Chen X G,et al.Optimization Design of Cross-Layer Packet Sizes in Deep Space Delay/Disruption Tolerant Network[J].Journal of Astronautics,2017,38(5):533-541.)
[14]Liu Y,Wang K,Xu L,et al.An Improved Packet Sending Algorithm Based on LTP in Delay Tolerant Networks[J].Journal of Computational Information Systems,2014,10(12):5279-5286.
[15]梁迎春.CFDP协议中延迟NAK文件传输时间分析与仿真[J].航天控制,2012,30(2):80-83.(Liang Y C.Analysis and Simulation on File Delivery Time of Deferred NAK in CFDP Protocol[J],Aerospace Control,2012,30(2):80-83.)
[16]梁迎春.CFDP协议中延迟NAK模式的一种改进建议[J].航天控制,2012,30(4):60-63.(Liang Y C.An Improved Proposal to Deferred NAK Mode in CFDPProtocol[J].Aerospace Control,2012,30(4):60-63.)
[17]吴海涛.CFDP中延迟NAK双重传方案的验证与分析[J].航天控制,2012,30(6):65-69.(Wu H T.The Validation and Analysis of Double Retransmission Scheme to Deferred NAK in CFDP Protocol[J],Aerospace Control,2012,30(6):65-69.)
[18]Wu H,Li Y,Jiao J,et al.LTP Asynchronous Accelerated Retransmission Strategy for Deep Space Communications[C]//IEEE International Conference on Wireless for Space and Extreme Environments,Aachen,2017:99-104.
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