延迟/中断容忍网络技术在载人登月通信中的应用研究

Application and Analysis of Delay/Disruption Tolerant Network in Manned Lunar Network

针对未来构建天地一体化空间网络的需求,分析了载人登月网络的特点以及目前地面网络广泛应用的TCP/IP协议应用于载人登月网络所遇到的一系列问题;针对这些问题,提出了使用延迟/中断容忍网络(DTN,delay/disruption tolerant network)体系来构建载人登月网络的设想,并设计了载人登月网络协议体系架构;最后通过在测试平台上进行真实的文件传递试验来对基于DTN技术的载人登月网络进行性能仿真,并对利克里德传输协议(LTP,licklider transmission protocol)的参数进行理论上的优化分析;仿真结果表明,在地月信道误码率较高的情况下,采用LTP segment大小为400 Bytes,相比于LTP segment大小为1400 Bytes、800 Bytes和100 Bytes,分别提高了17540 Bytes/s、4160 Bytes/s和47000 Bytes/s的有效吞吐量。

Aiming at the requirement of building the space-ground integrative network in the future,the characteristic of the manned lunar network and a series of problems that will occur when the TCP/IP protocol suite is applied to the network are analyzed.To solve these problems,the idea of using Delay/Disruption Tolerant Network(DTN)to build the manned lunar network is proposed,as well as the protocol architecture of the network is designed.Finally,the performance of manned lunar network based on Delay/Disruption Tolerant Network technology is emulated by file-transfer experiments using the testbed.Besides,the parameter selection of Licklider Transmission Protocol(LTP)is analyzed theoretically,and the experimental results indicate that the improvements of 17540 Bytes/s,4160 Bytes/s,and 47000 Bytes/s in effective throughput can be obtained with LTP segment size of 400 Bytes,compared with that with LTP segment size of 1400 Bytes,800 Bytes,and 100 Bytes respectively at high bit error rate.