發(fā)布時(shí)間：2019-05-23 19:38

【摘要】：近年來(lái),隨著移動(dòng)互聯(lián)網(wǎng)的大規(guī)模部署應(yīng)用,為適應(yīng)當(dāng)今及未來(lái)泛在異構(gòu)的網(wǎng)路接入環(huán)境,移動(dòng)終端普遍使用多接口技術(shù),方便用戶隨時(shí)隨地訪問(wèn)互聯(lián)網(wǎng),也推動(dòng)了多路傳輸方式的興起與發(fā)展。多路傳輸具有帶寬聚合、冗余容錯(cuò)、負(fù)載均衡等特征優(yōu)勢(shì),能夠提高數(shù)據(jù)吞吐量,滿足內(nèi)容實(shí)時(shí)性與交互性的高帶寬需求,成為未來(lái)互聯(lián)網(wǎng)數(shù)據(jù)傳輸?shù)陌l(fā)展趨勢(shì)之一。然而,在高動(dòng)態(tài)的無(wú)線移動(dòng)網(wǎng)絡(luò)中,多路傳輸不可避免遭受數(shù)據(jù)失序與丟失問(wèn)題的影響,造成傳輸阻塞,大大降低傳輸效率。現(xiàn)有大部分研究方案僅僅依靠傳輸層參數(shù)來(lái)實(shí)施數(shù)據(jù)調(diào)度,難以捕獲底層無(wú)線鏈路的變化情況,導(dǎo)致數(shù)據(jù)調(diào)度的準(zhǔn)確性和有效性不足。同時(shí),在網(wǎng)絡(luò)資源緊張和競(jìng)爭(zhēng)的情況下,多路傳輸?shù)牟l(fā)性和貪婪性會(huì)侵占過(guò)多的帶寬資源,引起對(duì)當(dāng)前占主導(dǎo)的TCP數(shù)據(jù)流的不友好性,影響整體網(wǎng)絡(luò)性能。 針對(duì)上述問(wèn)題,本文提出了一種新穎的跨層優(yōu)化的多路友好傳輸解決方案,對(duì)現(xiàn)有多路傳輸協(xié)議進(jìn)行改進(jìn),為未來(lái)移動(dòng)網(wǎng)絡(luò)服務(wù)及應(yīng)用提供高效而友好的數(shù)據(jù)傳輸服務(wù)。本文開(kāi)展了如下研究工作：(1)設(shè)計(jì)了無(wú)線鏈路等效測(cè)量計(jì)算方法,準(zhǔn)確而簡(jiǎn)便獲得鏈路層參數(shù)；(2)設(shè)計(jì)了新型的時(shí)延測(cè)量、帶寬估計(jì)和速率估計(jì)算法,完善傳輸層參數(shù)的獲取；(3)提出了基于友好性窗口的流量控制機(jī)制,結(jié)合獎(jiǎng)勵(lì)和懲罰方法,兼顧公平與效率；(4)建立了路徑容量的跨層評(píng)估模型,基于丟包分析修改了重傳策略,實(shí)現(xiàn)精確的路徑管控和有效的數(shù)據(jù)適配。 為評(píng)估該方案的性能,本文搭建了基于NS-2仿真平臺(tái)的多組網(wǎng)絡(luò)場(chǎng)景,進(jìn)行了詳細(xì)具體的仿真實(shí)驗(yàn)測(cè)試。實(shí)驗(yàn)結(jié)果表明,對(duì)比現(xiàn)有的多路傳輸方案,本文所提出的方案在數(shù)據(jù)吞吐量指標(biāo)和TCP友好性指標(biāo)上有明顯優(yōu)勢(shì),能夠顯著提高數(shù)據(jù)吞吐量,同時(shí)保證TCP友好性,優(yōu)化整體網(wǎng)絡(luò)性能,提高網(wǎng)絡(luò)資源利用率。
[Abstract]:In recent years, with the large-scale deployment of mobile Internet applications, in order to adapt to the current and future heterogeneous network access environment, mobile terminals generally use multi-interface technology to facilitate users to access the Internet anytime and anywhere. It also promotes the rise and development of multi-channel transmission mode. Multi-channel transmission has the advantages of bandwidth aggregation, redundancy and fault tolerance, load balancing and so on. It can improve data throughput and meet the high bandwidth requirements of real-time and interactive content. It has become one of the development trends of Internet data transmission in the future. However, in high dynamic wireless mobile networks, multi-channel transmission is inevitably affected by data disorder and loss, resulting in transmission congestion and greatly reducing transmission efficiency. Most of the existing research schemes only rely on transport layer parameters to implement data scheduling, which is difficult to capture the changes of the underlying wireless link, resulting in insufficient accuracy and effectiveness of data scheduling. At the same time, under the condition of tight and competitive network resources, the concurrency and greed of multi-channel transmission will encroach on too many bandwidth resources, which will cause unfriendliness to the current dominant TCP data stream and affect the overall network performance. In order to solve the above problems, a novel cross-layer optimized multi-channel friendly transmission solution is proposed in this paper, which improves the existing multi-channel transmission protocols and provides efficient and friendly data transmission services for future mobile network services and applications. In this paper, the following research work is carried out: (1) the equivalent measurement and calculation method of wireless link is designed, and the link layer parameters are obtained accurately and easily; (2) A new algorithm of delay measurement, bandwidth estimation and rate estimation is designed to improve the acquisition of transport layer parameters. (3) A flow control mechanism based on friendliness window is proposed, which combines reward and punishment methods to take into account fairness and efficiency. (4) the cross-layer evaluation model of path capacity is established, and the retransmission strategy is modified based on packet loss analysis to achieve accurate path control and effective data adaptation. In order to evaluate the performance of the scheme, several sets of network scenarios based on NS-2 simulation platform are built in this paper, and the detailed simulation experiments are carried out. The experimental results show that compared with the existing multi-channel transmission schemes, the proposed scheme has obvious advantages in data throughput index and TCP friendliness index, and can significantly improve data throughput and ensure TCP friendliness. Optimize the overall network performance and improve the utilization of network resources.
【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)】：TN929.5;TP393.01

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本文編號(hào)：2484170