本文選題：多徑TCP + 傳輸協(xié)議　； 參考：《北京郵電大學(xué)》2015年碩士論文

【摘要】：伴隨著互聯(lián)網(wǎng)和無線網(wǎng)絡(luò)技術(shù)的飛速發(fā)展,移動終端隨處可見,隨時隨地上網(wǎng)成為了現(xiàn)實(shí),也成為了用戶的一種普遍需求。然而無線網(wǎng)絡(luò)由于受到傳輸媒介的限制,它的帶寬和時延都無法滿足用戶的需求。盡管大部分移動終端上都有兩個及以上的網(wǎng)絡(luò)接口,但現(xiàn)有的網(wǎng)絡(luò)傳輸協(xié)議僅支持單路徑傳輸,只使用了了其中一個接口,并沒有使資源得到充分的利用。因此,多路徑傳輸成為近年來的一個研究熱點(diǎn)。本課題的研究點(diǎn)是無線網(wǎng)絡(luò)中的多路徑傳輸協(xié)議�，F(xiàn)有的多路徑傳輸協(xié)議中普遍存在著瓶頸鏈路的問題,即較差鏈路會成為網(wǎng)絡(luò)傳輸?shù)钠款i,影響較好鏈路的傳輸,進(jìn)而導(dǎo)致整個網(wǎng)絡(luò)的吞吐量下降,在無線網(wǎng)絡(luò)中瓶頸鏈路的問題會更嚴(yán)重。本文首先介紹一些和研究課題相關(guān)的技術(shù),先是無線網(wǎng)絡(luò)的相關(guān)技術(shù),然后介紹了網(wǎng)絡(luò)編碼的相關(guān)技術(shù),主要介紹了三種主流的網(wǎng)絡(luò)編碼方式,即隨機(jī)線性編碼、噴泉碼、系統(tǒng)碼,詳細(xì)介紹了兩種多路徑傳輸協(xié)議。最后,我們設(shè)計(jì)了一種基于隨機(jī)線性編碼的多徑TCP傳輸協(xié)議NCMPTCP,該協(xié)議將網(wǎng)絡(luò)編碼技術(shù)應(yīng)用到多路徑傳輸中以弱化鏈路之間的影響,盡可能的提高多徑傳輸?shù)耐掏铝�。傳輸前先將�?shù)據(jù)分成數(shù)據(jù)塊,然后對各個數(shù)據(jù)塊進(jìn)行編碼,同一數(shù)據(jù)塊中的編碼包是相互獨(dú)立的,任何編碼包都不是唯一的,都可以互相替代。接收方不用關(guān)心接收到編碼包的順序,只關(guān)心編碼包的數(shù)量。一旦該數(shù)量達(dá)到指定值,就能夠成功解碼數(shù)據(jù)塊,還原出原始信息。網(wǎng)絡(luò)編碼能屏蔽數(shù)據(jù)差異性的優(yōu)點(diǎn)可以使用到傳輸中,屏蔽數(shù)據(jù)包的差異性,解決異構(gòu)網(wǎng)絡(luò)中的瓶頸鏈路問題。在此基礎(chǔ)上,文中設(shè)計(jì)了一種基于估計(jì)交付時間的多徑調(diào)度算法,根據(jù)各條路徑的鏈路情況調(diào)度編碼包,目的是充分利用帶寬資源,讓各條路徑相互協(xié)調(diào),盡快將塊中編碼包傳輸?shù)綄Χ?使網(wǎng)絡(luò)的實(shí)際吞吐量和資源利用率最大化。
[Abstract]:With the rapid development of Internet and wireless network technology, mobile terminals can be seen everywhere. However, due to the limitation of transmission media, the bandwidth and delay of wireless network can not meet the needs of users. Although there are two or more network interfaces on most mobile terminals, the existing network transport protocols only support single path transmission, only one of them is used, and the resources are not fully utilized. Therefore, multipath transmission has become a research hotspot in recent years. The research point of this thesis is the multipath transmission protocol in wireless network. The problem of bottleneck link exists in the existing multipath transmission protocol, that is, the poor link will become the bottleneck of network transmission, which will affect the transmission of better link, and then lead to the decline of the throughput of the whole network. The problem of bottleneck links in wireless networks is even more serious. This paper first introduces some technologies related to the research topic, first the wireless network technology, then introduces the network coding related technology, mainly introduces the three main network coding methods, namely random linear coding, fountain code, Fountain Code, Fountain Code, Fountain Code, Fountain Code, Fountain Code, Fountain Code. System code, two multipath transmission protocols are introduced in detail. Finally, we design a multipath TCP transport protocol based on random linear coding, which applies network coding technology to multipath transmission to reduce the influence between links, and improve the throughput of multipath transmission as much as possible. Before transmission, the data is divided into data blocks, and then each block is encoded. The coding packets in the same block are independent of each other, and any coded packets are not unique and can be replaced by each other. The recipient does not care about the order in which the encoded packets are received, but the number of packets. Once the number reaches the specified value, the data block can be decoded successfully and the original information can be restored. The advantage of network coding which can shield data differences can be used in transmission, mask the differences of data packets, and solve the bottleneck link problem in heterogeneous networks. On this basis, a multipath scheduling algorithm based on estimation of delivery time is designed to schedule the coding packets according to the link conditions of each path. The purpose of this algorithm is to make full use of the bandwidth resources and coordinate the paths with each other. Code packets in blocks are transmitted to the opposite end as soon as possible to maximize the actual throughput and resource utilization of the network.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN915.04

【參考文獻(xiàn)】

相關(guān)期刊論文 前4條

1 蘇琪;龔儉;蘇艷s，

本文編號：1948879