本文選題：大帶寬時(shí)延積 + 擁塞控制　； 參考：《北京郵電大學(xué)》2014年碩士論文

【摘要】：隨著主干網(wǎng)帶寬的大幅度提升、遠(yuǎn)程網(wǎng)絡(luò)連接的應(yīng)用以及衛(wèi)星網(wǎng)絡(luò)的普及等,這些網(wǎng)絡(luò)應(yīng)用均具有大帶寬時(shí)延積特征,已成為未來(lái)網(wǎng)絡(luò)的發(fā)展趨勢(shì)。帶寬時(shí)延積,即帶寬與時(shí)延的乘積,是一個(gè)能夠反映網(wǎng)絡(luò)傳輸速率的重要指標(biāo)。在網(wǎng)絡(luò)高速發(fā)展的背景下,原有的擁塞控制算法面臨著新的挑戰(zhàn),因此設(shè)計(jì)適用于大帶寬時(shí)延積網(wǎng)絡(luò)的擁塞控制算法具有十分重要的理論意義。 針對(duì)這種不足,本文從以下兩個(gè)方面展開(kāi)論文的研究工作： 首先,從互聯(lián)網(wǎng)使用最為廣泛的AIMD算法出發(fā),對(duì)其中基于時(shí)延的Vegas算法進(jìn)行了研究和改進(jìn)。論文分別從慢啟動(dòng)和擁塞避免兩個(gè)階段分析了Vegas算法在大帶寬時(shí)延積網(wǎng)絡(luò)下存在的問(wèn)題。在慢啟動(dòng)階段,本文分析了產(chǎn)生慢啟動(dòng)結(jié)束過(guò)快的原因,引入了速率控制因子作為調(diào)制窗口增長(zhǎng)速率的因素,從而有效解決了慢啟動(dòng)結(jié)束過(guò)快的問(wèn)題；在擁塞避免階段,通過(guò)動(dòng)態(tài)地調(diào)整窗口的變化速率,避免了長(zhǎng)時(shí)間窗口處于線性增減的問(wèn)題。本文將該算法命名為Vegas-f,并通過(guò)NS2仿真驗(yàn)證了算法的性能,仿真結(jié)果表明算法擁有更短的收斂時(shí)間,更好的協(xié)議間公平性。 其次,從MIMD算法的出發(fā),文章分析了目前主要針對(duì)大帶寬時(shí)延積網(wǎng)絡(luò)的一種擁塞控制協(xié)議FAST TCP的性能及存在的問(wèn)題,提出了改進(jìn)方案。FAST TCP是一種比較新的擁塞控制協(xié)議,本文首先分析了其對(duì)網(wǎng)絡(luò)的依賴性以及公平性方面的不足,其中公平性的不足是由于不同時(shí)間段的數(shù)據(jù)流造成的。通過(guò)分析,不同時(shí)間段的數(shù)據(jù)流會(huì)造成最小鏈路時(shí)延估計(jì)不準(zhǔn)確,由此,文章提出了一種由窗口以及RTT變化來(lái)調(diào)節(jié)鏈路最小時(shí)延的改進(jìn)算法,并且通過(guò)與傳統(tǒng)算法進(jìn)行仿真驗(yàn)證對(duì)比,從側(cè)面證明了改進(jìn)算法具有更好的協(xié)議內(nèi)公平性。 以上從AIMD和MIMD角度改進(jìn)的擁塞控制算法,為大帶寬時(shí)延積網(wǎng)絡(luò)的應(yīng)用發(fā)展提供了有效的理論支持。
[Abstract]:With the rapid increase of backbone network bandwidth, the application of remote network connection and the popularization of satellite network, these network applications have the characteristics of large bandwidth delay product, which has become the trend of future network development. Bandwidth delay product, which is the product of bandwidth and delay, is an important index which can reflect the network transmission rate. With the rapid development of the network, the existing congestion control algorithms are facing new challenges, so it is of great theoretical significance to design congestion control algorithms suitable for large bandwidth delay product networks. In view of this deficiency, this paper starts the research work from the following two aspects: Firstly, based on the most widely used AIMD algorithm on the Internet, the delay-based Vegas algorithm is studied and improved. In this paper, the problems of Vegas algorithm in large bandwidth delay product networks are analyzed in terms of slow start and congestion avoidance. In the stage of slow start, this paper analyzes the causes of slow start end too fast, introduces the rate control factor as the factor of modulation window growth rate, thus effectively solves the problem of slow start end too fast. By adjusting the changing rate of window dynamically, the problem of long time window in linear increasing or decreasing is avoided. The algorithm is named Vegas-f. and the performance of the algorithm is verified by NS2 simulation. The simulation results show that the algorithm has shorter convergence time and better inter-protocol fairness. Secondly, starting from the MIMD algorithm, this paper analyzes the performance and existing problems of a congestion control protocol FAST TCP, which is mainly used in large bandwidth delay product networks, and proposes an improved scheme. Fast TCP is a new congestion control protocol. This paper first analyzes its dependence on the network and the lack of fairness, in which the lack of fairness is caused by the data flow in different time periods. Through analysis, the data flow in different time periods will cause the minimum link delay estimation to be inaccurate. Therefore, an improved algorithm is proposed to adjust the minimum link delay by changing the window and RTT. Compared with the traditional algorithm, the improved algorithm has better intra-protocol fairness. The above improved congestion control algorithms from the point of view of AIMD and MIMD provide an effective theoretical support for the application and development of large bandwidth delay product networks.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TP393.06

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 顧明;張軍;蘇東林;;大帶寬時(shí)延積網(wǎng)絡(luò)TCP Vegas自適應(yīng)慢啟動(dòng)算法[J];電訊技術(shù);2007年02期

2 梁豐,翁格奇;AIMD擁塞控制算法分析[J];計(jì)算機(jī)工程與應(yīng)用;2004年01期

3 劉擁民;蔣新華;年曉紅;魯五一;;Internet端到端擁塞控制研究綜述[J];計(jì)算機(jī)科學(xué);2008年02期

4 邢國(guó)穩(wěn);薛勝軍;;高速網(wǎng)絡(luò)擁塞控制協(xié)議VCP的研究[J];計(jì)算機(jī)科學(xué);2009年03期

5 陳卓;劉波;;基于XCP協(xié)議的擁塞控制研究[J];計(jì)算機(jī)工程;2006年04期

6 陳晶,鄭明春,孟強(qiáng);基于路由器的網(wǎng)絡(luò)擁塞控制策略研究[J];計(jì)算機(jī)工程與科學(xué);2002年04期

7 羅萬(wàn)明,林闖,閻保平;TCP/IP擁塞控制研究[J];計(jì)算機(jī)學(xué)報(bào);2001年01期

8 黎蕓;陳元琰;羅曉曙;張軍洲;;高速網(wǎng)絡(luò)STCP擁塞控制算法的改進(jìn)[J];計(jì)算機(jī)應(yīng)用與軟件;2009年06期

9 賴峻;葉梧;馮穗力;;高速網(wǎng)絡(luò)傳輸控制協(xié)議研究[J];科學(xué)技術(shù)與工程;2009年04期

10 秦光;;計(jì)算機(jī)網(wǎng)絡(luò)擁塞的高效控制方法研究[J];計(jì)算機(jī)仿真;2012年09期

相關(guān)博士學(xué)位論文 前1條

1 毛鵬軒;下一代網(wǎng)絡(luò)擁塞控制關(guān)鍵算法的研究[D];北京交通大學(xué);2013年

，

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