深空DTN网络中LTP协议的额外传输开销优化
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摘要
针对深空延迟/中断容忍网络(DTN)能量资源有限,而利克里德传输协议(LTP)段大小对额外传输开销影响明显,需要确定最优的LTP段大小的问题,文章分析了深空DTN网络的数据传输过程,利用深空DTN网络中额外传输开销的数学理论模型,通过求导的方法计算出了LTP段大小的最优值,并得到了最优化问题的解析解。数值仿真结果表明:通过解析解表达式得到的LTP段大小的最优值与该最优化问题的数值解重合,在深空通信时采用此方法,可快速精准地选择LTP段大小,也可大幅减小额外传输开销。
The available energy resources in deep space Delay/Disruption Tolerant Network(DTN)are very limited,and the Licklider transmission protocol(LTP)segment size has an obvious impact on the extra transmission effort,so it is essential to determine the optimal LTP segment size.In this paper,the data transmission process of deep space DTN is analyzed firstly.Then,based on the theoretical model of extra transmission effort,analytical solution of the optimization problem known as the optimal LTP segment size is computed by introducing the derivative of extra transmission effort with respect to LTP segment size.The simulation results show that the optimal LTP segment sizes achieved by the expression of the analytical solution and the numerical solution of the optimization problem coincide.This method can provide a fast and accurate solution to the selection of the LTP segment size,and save the extra transmission effort efficiently in the deep space communications.
The available energy resources in deep space Delay/Disruption Tolerant Network(DTN)are very limited,and the Licklider transmission protocol(LTP)segment size has an obvious impact on the extra transmission effort,so it is essential to determine the optimal LTP segment size.In this paper,the data transmission process of deep space DTN is analyzed firstly.Then,based on the theoretical model of extra transmission effort,analytical solution of the optimization problem known as the optimal LTP segment size is computed by introducing the derivative of extra transmission effort with respect to LTP segment size.The simulation results show that the optimal LTP segment sizes achieved by the expression of the analytical solution and the numerical solution of the optimization problem coincide.This method can provide a fast and accurate solution to the selection of the LTP segment size,and save the extra transmission effort efficiently in the deep space communications.
引文
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[14]唐力群,杨明川,肖靖,等.面向火星探测的中继通信星座设计[J].国际太空,2014(8):25-28Tang Liqun,Yang Mingchuan,Xiao Jing,et al.Design of relay communication constellation for Mars exploration[J].Space International,2014(8):25-28(in Chinese)
[2]Durst R C,Feighery P D,Scott K L.Why not use the standard internet suite for the interplanetary internet[EB/OL].[2017-01-20].http://www.ipnsig.org/reports/TCP_IP.pdf
[3]Fall K.A delay-tolerant network architecture for challenged internets[C]//In Proceedings of SIGCOMM’03.New York:ACM,2003:27-34
[4]燕洪成,张庆君,孙勇,等.延迟/中断容忍网络技术及其在行星际因特网中的应用[J].航天器工程,2014,23(2):114-123Yan Hongcheng,Zhang Qingjun,Sun Yong,et al.Delay/Disruption tolerant network and its application to interplanetary internet[J].Spacecraft Engineering,2014,23(2):114-123(in Chinese)
[5]Scott K,Burleigh S.IETF RFC 5050Bundle protocol specification[S].Washington D.C.:NASA Jet Propulsion Laboratory,2007
[6]Burleigh S,Ramadas M,Farrell S.IETF RFC 5325Licklider transmission protocol-motivation[S].Washington D.C.:NASA Jet Propulsion Laboratory,2008
[7]Ramadas M,Burleigh S,Farrell S.IETF RFC 5326Licklider transmission protocol-specification[S].Washington D.C.:NASA Jet Propulsion Laboratory,2007
[8]Bezirgiannidis N,Tsaoussidis V.Packet size and DTNtransport service:Evaluation on a DTN Testbed[C]//In2010International Congress on Ultra Modern Telecommunications and Control Systems and Workshops.Moscow:Russia Popov Society,2010:1198-1205
[9]Samaras C,Tsaoussidis V.Adjusting transport segmentation policy of DTN Bundle protocol under synergy with lower layers[J].Journal of Systems and Software,2011,84(2):226-237
[10]Jiang F,Lu H.Packet size optimization in delay tolerant networks[C]//In Proceedings of the 11th Annual IEEE Consumer Communications and Networking Conference(CNCC).New York:IEEE Communications Society,2014:392-397
[11]Lu H,Jiang F,Wu J,et al.Performance improvement in DTNs by packet size optimization[J].IEEE Transactions on Aerospace and Electronic Systems,2015,51(4):2987-2999
[12]Wang Y,Yang H,Chen X,et al.Energy saving scheme of delay/disruption tolerant network in deep space communications[C]//8th International Conference on Wireless Communications&Signal Processing(WCSP2016).New York:IEEE Communications Society,2016
[13]Chong E K P,Zak S H.最优化导论[M].孙志强,白圣建,郑永斌,译.4版.北京:电子工业出版社,2015:192-195Chong E K P,Zak S H.An introduction to optimization[M].Sun Zhiqiang,Bai Shengjian,Zheng Yongbin,translated.4th ed.Beijing:Publishing House of Electronics Industry,2015:192-195(in Chinese)
[14]唐力群,杨明川,肖靖,等.面向火星探测的中继通信星座设计[J].国际太空,2014(8):25-28Tang Liqun,Yang Mingchuan,Xiao Jing,et al.Design of relay communication constellation for Mars exploration[J].Space International,2014(8):25-28(in Chinese)