本文選題：延遲容忍網(wǎng)絡(luò)　切入點(diǎn)：地月通信　出處：《北京交通大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：延遲容忍網(wǎng)絡(luò)(Delay Tolerant Network, DTN)是一種可以在受限網(wǎng)絡(luò)環(huán)境中實(shí)現(xiàn)有效通信的網(wǎng)絡(luò)架構(gòu),為用戶在具有長(zhǎng)時(shí)延、高誤碼率、連接頻繁中斷等特征的異構(gòu)網(wǎng)絡(luò)中提供通信保證,滿足復(fù)雜環(huán)境條件下建立互通互聯(lián)網(wǎng)絡(luò)的需求。在受限通信環(huán)境中,可用鏈路資源有限,因此如何高效的利用鏈路資源,提高傳輸可靠性和傳輸效率是DTN架構(gòu)研究中一個(gè)值得關(guān)注的領(lǐng)域。本文以國(guó)家863計(jì)劃課題“未來(lái)一體化網(wǎng)絡(luò)關(guān)鍵技術(shù)和示范”(NO.SQ2015AA0101106)為依托,對(duì)DTN網(wǎng)絡(luò)架構(gòu)中主要匯聚適配傳輸層協(xié)議進(jìn)行了分析測(cè)試,并重點(diǎn)對(duì)Licklider傳輸協(xié)議(Licklider Transmission Protocol, LTP)的通信機(jī)制及其傳輸模型做了相關(guān)研究。本文首先介紹了DTN網(wǎng)絡(luò)體系結(jié)構(gòu)和DTN網(wǎng)絡(luò)結(jié)構(gòu)中包裹層和匯聚適配傳輸層主要協(xié)議：包裹協(xié)議(Bundle Protocol, BP)、LTP協(xié)議、TCPCL協(xié)議(TCPConvergence-Layer Protocol)、UDPCL協(xié)議(UDP Convergence-Layer Protocol)。通過(guò)STK (Satellite Tool Kit)仿真平臺(tái)建立深空環(huán)境地月通信場(chǎng)景,并在實(shí)驗(yàn)室設(shè)計(jì)的深空通信鏈路模擬平臺(tái)中分別完成LTP架構(gòu),TCPCL架構(gòu)和TCPCL/LTP混合架構(gòu)的地月通信場(chǎng)景實(shí)驗(yàn)測(cè)試,分析造成三種協(xié)議架構(gòu)吞吐量性能差異的主要原因。接著完成了單跳通信環(huán)境中LTP架構(gòu)及TCPCL架構(gòu)的吞吐量性能測(cè)試及不同LTP協(xié)議匯聚策略下的吞吐量性能測(cè)試,從協(xié)議設(shè)計(jì)機(jī)制等方面深入分析了LTP協(xié)議與TCPCL協(xié)議匯聚機(jī)制差異,并得到不同LTP協(xié)議匯聚策略下吞吐量性能的變化結(jié)果。隨后,本文從數(shù)學(xué)分析的角度出發(fā)建立了LTP協(xié)議傳輸模型。主要基于LTP協(xié)議鏈路帶寬利用率、有效傳輸數(shù)據(jù)比例和完整交付時(shí)長(zhǎng),分別建立LTP協(xié)議在非對(duì)稱上下行信道條件中的最佳傳輸效率模型、傳輸開(kāi)銷模型和交付延遲模型,同時(shí)進(jìn)行實(shí)驗(yàn)對(duì)比測(cè)試。并結(jié)合LTP協(xié)議傳輸模型及傳輸協(xié)議架構(gòu)測(cè)試結(jié)果,設(shè)計(jì)了地月通信環(huán)境LTP協(xié)議傳輸配置方案和配置界面。測(cè)試結(jié)果表明本文建立的分析模型可以在常規(guī)信道環(huán)境和高匯聚尺寸惡劣信道環(huán)境中準(zhǔn)確的描述實(shí)驗(yàn)結(jié)果,對(duì)DTN網(wǎng)絡(luò)中相關(guān)傳輸實(shí)驗(yàn)的開(kāi)展具有參考意義。
[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.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN915.04

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