本文選題：高速移動(dòng)　切入點(diǎn)：網(wǎng)絡(luò)擁塞　出處：《北京交通大學(xué)》2017年碩士論文

【摘要】：隨著高速鐵路的快速發(fā)展,高速移動(dòng)通信網(wǎng)絡(luò)成為高速鐵路信息化建設(shè)的重要方向之一。高鐵移動(dòng)通信網(wǎng)主要分為鐵路專網(wǎng)和用戶開放式網(wǎng)絡(luò)。本文根據(jù)特定的用戶開放式高鐵移動(dòng)通信網(wǎng)為研究背景,結(jié)合當(dāng)前高速網(wǎng)絡(luò)擁塞控制算法的研究現(xiàn)狀和發(fā)展趨勢(shì),對(duì)網(wǎng)絡(luò)擁塞控制算法進(jìn)行優(yōu)化與改進(jìn),并提出了提高網(wǎng)絡(luò)服務(wù)質(zhì)量的高速網(wǎng)絡(luò)擁塞控制算法。算法性能分析和仿真結(jié)果表明,該算法在高速鐵路特定場(chǎng)景下可以提高網(wǎng)絡(luò)性能與服務(wù)質(zhì)量。本文的主要工作具體如下:(1)提出了一種基于非線性丟包率的自適應(yīng)擁塞控制算法,稱為GTRED算法。該算法主要解決了 TRED算法隊(duì)列長(zhǎng)度震蕩過(guò)大的問(wèn)題。GTRED算法采用分段三次函數(shù)計(jì)算丟包概率,并將平均隊(duì)列的長(zhǎng)度擴(kuò)大到2倍的最大閾值,在擴(kuò)大算法作用范圍的基礎(chǔ)上,實(shí)現(xiàn)了動(dòng)態(tài)網(wǎng)絡(luò)環(huán)境中隊(duì)列長(zhǎng)度的穩(wěn)定。實(shí)驗(yàn)仿真結(jié)果表明,該算法可有效權(quán)衡高低流量負(fù)載之間延遲和吞吐量的關(guān)系,解決隊(duì)列長(zhǎng)度震蕩過(guò)大的問(wèn)題,具有更好的魯棒性和穩(wěn)定性,而且能夠有效的提升網(wǎng)絡(luò)性能。(2)提出了一種基于鏈路反饋的網(wǎng)絡(luò)擁塞控制算法,稱為Pre-HSTCP算法。通過(guò)對(duì)HSTCP算法、Fast TCP算法、STCP算法等高速網(wǎng)絡(luò)擁塞控制算法的深入研究,在對(duì)高速鐵路特定研究背景的特殊性進(jìn)行詳細(xì)分析的基礎(chǔ)上,得出其固定路線上的丟包率具有一定規(guī)律性的結(jié)論,將固定路線上的丟包率規(guī)律作為判別網(wǎng)絡(luò)擁塞情況的條件之一,對(duì)高速網(wǎng)絡(luò)擁塞控制算法進(jìn)行改進(jìn)與優(yōu)化,進(jìn)一步提高了高速鐵路環(huán)境下用戶開放式移動(dòng)通信網(wǎng)絡(luò)的性能。(3)通過(guò)NS2實(shí)驗(yàn)平臺(tái)對(duì)Pre-HSTCP算法進(jìn)行仿真實(shí)驗(yàn),其仿真結(jié)果充分證明了該算法的性能優(yōu)勢(shì)。Pre-HSTCP算法通過(guò)提前調(diào)整窗口大小的形式,可以有效降低丟包率,充分利用鏈路帶寬,使高速鐵路通信網(wǎng)絡(luò)獲得平穩(wěn)的數(shù)據(jù)流和較高的網(wǎng)絡(luò)吞吐量。
[Abstract]:With the rapid development of high-speed railway, high-speed mobile communication network has become one of the important directions of high-speed railway information construction.High-speed railway mobile communication network is mainly divided into railway private network and user open network.In this paper, according to the research background of specific user open high-speed railway mobile communication network, combined with the current research status and development trend of high-speed network congestion control algorithm, the network congestion control algorithm is optimized and improved.A congestion control algorithm for high-speed networks is proposed to improve the quality of service.The performance analysis and simulation results show that the proposed algorithm can improve the network performance and QoS under the specific scenario of high-speed railway.The main work of this paper is as follows: (1) an adaptive congestion control algorithm based on nonlinear packet loss rate, called GTRED algorithm, is proposed.The algorithm mainly solves the problem of excessive queue length oscillation in TRED algorithm. GTRED uses piecewise cubic function to calculate packet loss probability, and extends the average queue length to the maximum threshold of 2 times.The queue length in dynamic network environment is stable.The experimental results show that the proposed algorithm can effectively balance the relationship between the delay and throughput between high and low traffic loads, and solve the problem of excessive queue length fluctuations, and has better robustness and stability.This paper proposes a network congestion control algorithm based on link feedback, which is called Pre-HSTCP algorithm.Through the deep research on the congestion control algorithms of high-speed network, such as HSTCP algorithm, Fast TCP algorithm, and so on, the particularity of the specific research background of high-speed railway is analyzed in detail.It is concluded that the packet loss rate on the fixed route has certain regularity. Taking the law of packet loss rate on the fixed route as one of the conditions for judging the network congestion, the congestion control algorithm of the high-speed network is improved and optimized.The performance of user open mobile communication network in high-speed railway environment is further improved. The simulation experiment of Pre-HSTCP algorithm is carried out through NS2 experimental platform.The simulation results show that the pre-HSTCP algorithm can effectively reduce the packet loss rate and make full use of the link bandwidth by adjusting the window size in advance.Make the high-speed railway communication network to obtain stable data flow and high network throughput.
【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】：2017
【分類號(hào)】：U285.21;TN929.5

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