深空DTN网络中LTP协议的额外传输开销优化  

Optimization in Terms of Extra Transmission Effort of LTP Protocol in Deep Space DTNs

作　　者：王洋[1] 杨宏[1] 陈晓光[1] 丁凯[1] WANG Yang YANG Hong CHEN Xiaoguang DING Kai(Institute of Manned Space System Engineering,China Academy of Space Technology, Beijing 100094, China)

机构地区：[1]中国空间技术研究院载人航天总体部,北京100094

出　　处：《航天器工程》2017年第3期78-83,共6页Spacecraft Engineering

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 obvi-ous impact on the extra transmission effort, so it is essential to determine the optimal LTP seg-ment 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 opti-mization problem known as the optimal LTP segment size is computed by introducing the deriva-tive 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 accu-rate solution to the selection of the LTP segment size,and save the extra transmission effort effi-ciently in the deep space communications.

关 键 词：延迟/中断容忍网络 利克里德传输协议 深空通信 段大小优化 额外传输开销 解析解 

分 类 号：TN927[电子电信—通信与信息系统]