延迟容忍网络传输协议研究

发布时间：2018-03-08 03:27

本文选题：延迟容忍网络　切入点：地月通信　出处：《北京交通大学》2016年硕士论文　论文类型：学位论文

【摘要】：延迟容忍网络(Delay Tolerant Network, DTN)是一种可以在受限网络环境中实现有效通信的网络架构,为用户在具有长时延、高误码率、连接频繁中断等特征的异构网络中提供通信保证,满足复杂环境条件下建立互通互联网络的需求。在受限通信环境中,可用链路资源有限,因此如何高效的利用链路资源,提高传输可靠性和传输效率是DTN架构研究中一个值得关注的领域。本文以国家863计划课题“未来一体化网络关键技术和示范”(NO.SQ2015AA0101106)为依托,对DTN网络架构中主要汇聚适配传输层协议进行了分析测试,并重点对Licklider传输协议(Licklider Transmission Protocol, LTP)的通信机制及其传输模型做了相关研究。本文首先介绍了DTN网络体系结构和DTN网络结构中包裹层和汇聚适配传输层主要协议：包裹协议(Bundle Protocol, BP)、LTP协议、TCPCL协议(TCPConvergence-Layer Protocol)、UDPCL协议(UDP Convergence-Layer Protocol)。通过STK (Satellite Tool Kit)仿真平台建立深空环境地月通信场景,并在实验室设计的深空通信链路模拟平台中分别完成LTP架构,TCPCL架构和TCPCL/LTP混合架构的地月通信场景实验测试,分析造成三种协议架构吞吐量性能差异的主要原因。接着完成了单跳通信环境中LTP架构及TCPCL架构的吞吐量性能测试及不同LTP协议汇聚策略下的吞吐量性能测试,从协议设计机制等方面深入分析了LTP协议与TCPCL协议汇聚机制差异,并得到不同LTP协议汇聚策略下吞吐量性能的变化结果。随后,本文从数学分析的角度出发建立了LTP协议传输模型。主要基于LTP协议链路带宽利用率、有效传输数据比例和完整交付时长,分别建立LTP协议在非对称上下行信道条件中的最佳传输效率模型、传输开销模型和交付延迟模型,同时进行实验对比测试。并结合LTP协议传输模型及传输协议架构测试结果,设计了地月通信环境LTP协议传输配置方案和配置界面。测试结果表明本文建立的分析模型可以在常规信道环境和高汇聚尺寸恶劣信道环境中准确的描述实验结果,对DTN网络中相关传输实验的开展具有参考意义。
[Abstract]:Delay Tolerant Network (DTNN) is a kind of network architecture which can realize effective communication in restricted network environment. It provides communication guarantee for users in heterogeneous networks with long delay, high bit error rate and frequent connection interruptions. In the limited communication environment, the available link resources are limited, so how to make efficient use of the link resources, Improving transmission reliability and transmission efficiency is an important field in the research of DTN architecture. This paper is based on the national 863 project "key Technology and demonstration of Future Integrated Network" (no. SQ2015AA0101106). This paper analyzes and tests the main convergent transport layer protocols in DTN network architecture. The communication mechanism and transport model of Licklider transport protocol, Licklider Transmission protocol, are studied. Firstly, this paper introduces the DTN network architecture and the main protocols of packet layer and convergent transport layer in DTN network structure. The protocol bundle protocol, the STK protocol and the TCPCL protocol are used to establish the Convergence-Layer Convergence-Layer protocol in the deep space environment, which is based on the simulation platform of STK satellite Tool Kitt, and is used to set up the monthly communication scene in the deep space environment by means of the UDPCL protocol and the UDPCL protocol. And in the laboratory design of the deep space communication link simulation platform completed the LTP architecture of TCPCL architecture and TCPCL/LTP hybrid architecture of the ground-month communication scenarios experimental test. The main reasons for the difference in throughput between the three protocols are analyzed. Then the throughput performance testing of LTP architecture and TCPCL architecture in single-hop communication environment and the throughput performance test under different LTP protocol convergence strategies are completed. The differences between LTP protocol and TCPCL protocol aggregation mechanism are analyzed from the aspects of protocol design mechanism, and the results of throughput performance change under different LTP protocol aggregation strategies are obtained. In this paper, the transmission model of LTP protocol is established from the point of view of mathematical analysis. It is mainly based on the utilization of link bandwidth of LTP protocol, the ratio of effective transmission data and the complete delivery time. The optimal transmission efficiency model, transmission overhead model and delivery delay model of LTP protocol in asymmetric uplink and downlink channel are established respectively, and the experimental results are compared and tested. The test results of LTP protocol transmission model and transmission protocol architecture are combined. The transmission configuration scheme and configuration interface of LTP protocol in ground-month communication environment are designed. The test results show that the analytical model established in this paper can accurately describe the experimental results in the conventional channel environment and the high convergent size bad channel environment. It has reference significance for the development of related transmission experiment in DTN network.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN915.04

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