Licklider Transmission Protocol (LTP)-Based DTN for Cislunar Communications
Licklider Transmission Protocol (LTP)-Based DTN for Cislunar Communications
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DOI：
10.1109/tnet.2010.2060733
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发表时间：
2011-04
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通讯作者：
Ruhai Wang;S. Burleigh;Paavan Parikh;Che-Jen Lin;Bo Sun
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文献类型：
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作者：
Ruhai Wang;S. Burleigh;Paavan Parikh;Che-Jen Lin;Bo Sun
延迟/中断容忍网络（DTN）技术为空间环境下的高压力通信提供了一种新的解决方案，特别是在深空任务中具有长链路延迟和频繁链路中断的通信。迄今为止，在评估DTN可用的“收敛层”协议，特别是Licklider传输协议（LTP）在应用于星际互联网（IPN）时的性能方面所做的工作很少。在本文中，我们在模拟的具有不同程度的信号传播延迟和数据丢失特征的地月通信环境中，对在各种“收敛层”协议上运行的束协议（BP）进行了实验评估。我们专注于运行在UDP/IP（即BP/LTPCL/UDP/IP）之上的LTP融合层（LTPCL）适配器。在基于pc的网络测试平台上，将BP/LTPCL/UDP/IP在实际文件传输中的性能与另外两种DTN协议栈选项BP/TCPCL/TCP/IP和BP/UDPCL/UDP/IP进行了比较。对实验结果的分析也采用了t检验的统计方法。实验结果表明，无论误码率（BER）如何，LTPCL都比传输控制协议收敛层（TCPCL）具有显著的性能优势。对于误码率约为10-5的非常有损耗的信道，LTPCL在所研究的所有链路延迟级别上都比TCPCL具有显著的优势，对于延迟超过1500 ms的信道，LTPCL的优势约为3000 B/s。在所有级别的链路延迟和ber上，LTPCL始终比UDPCL具有显著的优势，大约在2500-3000 B/s之间。
Delay/disruption-tolerant networking (DTN) technology offers a new solution to highly stressed communications in space environments, especially those with long link delay and frequent link disruptions in deep-space missions. To date, little work has been done in evaluating the performance of the available “convergence layer” protocols of DTN, especially the Licklider Transmission Protocol (LTP), when they are applied to an interplanetary Internet (IPN). In this paper, we present an experimental evaluation of the Bundle Protocol (BP) running over various “convergence layer” protocols in a simulated cislunar communications environment characterized by varying degrees of signal propagation delay and data loss. We focus on the LTP convergence layer (LTPCL) adapter running on top of UDP/IP (i.e., BP/LTPCL/UDP/IP). The performance of BP/LTPCL/UDP/IP in realistic file transfers over a PC-based network test bed is compared to that of two other DTN protocol stack options, BP/TCPCL/TCP/IP and BP/UDPCL/UDP/IP. A statistical method of t-test is also used for analysis of the experimental results. The experiment results show that LTPCL has a significant performance advantage over Transmission Control Protocol convergence layer (TCPCL) for link delays longer than 4000 ms regardless of the bit error rate (BER). For a very lossy channel with a BER of around 10-5, LTPCL has a significant goodput advantage over TCPCL at all the link delay levels studied, with an advantage of around 3000 B/s for delays longer than 1500 ms. LTPCL has a consistently significant goodput advantage over UDPCL, around 2500-3000 B/s, at all levels of link delays and BERs.