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

摘要:

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(Delay/Disruption Tolerant Network,DTN)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(Licklider Transmission Protocol,LTP)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。

Abstract:

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.