發(fā)布時間：2018-05-03 14:56

  本文選題：信息中心網(wǎng)絡(luò) + 內(nèi)容中心網(wǎng)絡(luò)�。� 參考：《北京郵電大學(xué)》2017年博士論文

【摘要】：互聯(lián)網(wǎng)從上個世紀(jì)誕生之初到現(xiàn)在,已經(jīng)發(fā)展成為信息社會的基礎(chǔ)設(shè)施之一。隨著云計(jì)算、物聯(lián)網(wǎng)、移動計(jì)算等技術(shù)的發(fā)展成熟,互聯(lián)網(wǎng)已滲透到經(jīng)濟(jì)、軍事、科技、新聞、教育等各個領(lǐng)域。以中國為例,中國互聯(lián)網(wǎng)絡(luò)發(fā)展?fàn)顩r統(tǒng)計(jì)報(bào)告顯示截至2016年12月份,互聯(lián)網(wǎng)用戶數(shù)量已達(dá)到7.31億,相比2005年的用戶數(shù)激增近7倍。同時,信息需求的多樣化也隨之增強(qiáng),相應(yīng)帶來對網(wǎng)絡(luò)的不同需求,網(wǎng)絡(luò)從最初的數(shù)據(jù)傳輸已經(jīng)變成集傳輸、存儲、運(yùn)算為一體的信息基礎(chǔ)設(shè)施平臺。因此,以IP為核心,以信息傳輸為目的的TCP/IP互聯(lián)網(wǎng)體系結(jié)構(gòu)越來越難以適應(yīng)服務(wù)發(fā)展的需求,而補(bǔ)丁式技術(shù)如內(nèi)容分發(fā)網(wǎng)絡(luò)CDN使得TCP/IP網(wǎng)絡(luò)變得越來越復(fù)雜,很難從根本上解決擴(kuò)展性、動態(tài)性、安全性等諸多問題。近年來,研究人員提出了信息中心網(wǎng)絡(luò)(Information-Centric Networking簡稱為ICN)這個全新的未來網(wǎng)絡(luò)體系架構(gòu)。ICN具有數(shù)據(jù)標(biāo)識、網(wǎng)內(nèi)緩存、良好的移動性等特征,利用與地址無關(guān)的數(shù)據(jù)標(biāo)識進(jìn)行路由通信,這種內(nèi)容和地址解耦的通信范式非常適合視頻分發(fā)等主流應(yīng)用、以及蓬勃發(fā)展的新型移動應(yīng)用如物聯(lián)網(wǎng)、車聯(lián)網(wǎng)等。服務(wù)是互聯(lián)網(wǎng)價值的最根本體現(xiàn),如何在全新的網(wǎng)絡(luò)體系架構(gòu)上實(shí)現(xiàn)高效的服務(wù)提供將是ICN能否大規(guī)模實(shí)用化部署的關(guān)鍵。目前,Web是互聯(lián)網(wǎng)的基礎(chǔ)服務(wù),而視頻服務(wù)則是互聯(lián)網(wǎng)帶寬的主要消費(fèi)者。因此,本文將針對這兩類具體的服務(wù)開展研究工作,主要貢獻(xiàn)包括以下三個方面:(1)針對ICN中的Web服務(wù)提供問題,本文基于開源的內(nèi)容中心網(wǎng)絡(luò)(Content-Centric Networking 簡稱為 CCN)協(xié)議棧 CCNx 和開源的Tomcat程序包,提出并實(shí)現(xiàn)了面向ICN的Web服務(wù)容器CCNxTomcat。CCNxTomcat可以同時運(yùn)行在TCP/IP網(wǎng)絡(luò)和ICN之上,支持網(wǎng)絡(luò)演進(jìn)過程中服務(wù)的平滑遷移。與現(xiàn)有的技術(shù)相比,CCNxTomcat可以支持更高的并發(fā)用戶、以及更低的訪問延遲。同時,我們也將CCNxTomcat部署在校園網(wǎng)的ICN測試平臺之上,用戶可以通過瀏覽器訪問ICN中的Web應(yīng)用,這對于ICN的實(shí)用化推廣具有重要的意義。(2)針對ICN Web服務(wù)器的性能問題,提出并實(shí)現(xiàn)了面向ICN的Web服務(wù)器動態(tài)請求緩存ccncache。ccncache由計(jì)數(shù)布隆過濾器、字典樹、以及跳躍鏈表組成,是一種低延遲,高并發(fā)的ICN數(shù)據(jù)包緩存。我們將ccncache集成在CCNxTomcat之中,并將之部署在校園網(wǎng)的測試環(huán)境中。通過實(shí)驗(yàn)數(shù)據(jù)顯示,ccncache相比現(xiàn)有的緩存技術(shù),其查詢時間減少了 2.5倍。(3)針對ICN動態(tài)自適應(yīng)流媒體的用戶體驗(yàn)問題,提出了 ICN無線網(wǎng)絡(luò)中動態(tài)自適應(yīng)流媒體的優(yōu)化框架BC-DAS。BC-DAS在ICN網(wǎng)絡(luò)層提出并實(shí)現(xiàn)了基于包對的可用帶寬探測算法,在應(yīng)用層利用馬爾科夫決策針對多緩存、多碼率的環(huán)境作出最優(yōu)的碼率適配。通過實(shí)驗(yàn)數(shù)據(jù)顯示,BC-DAS與現(xiàn)有的碼率適配技術(shù)相比,其整體的用戶體驗(yàn)有大幅提升。同時,具體的視頻質(zhì)量指標(biāo)如啟動延遲、平均碼率、視頻觀看卡頓、視頻卡頓率都得到了優(yōu)化。
[Abstract]:The Internet has developed into one of the infrastructure of the information society from the beginning of last century to now. With the development of cloud computing, Internet of things, mobile computing and other technologies, the Internet has penetrated into the economy, military, technology, news, education and other fields. In China, for example, the number of Internet users reached 731 million as of December 2016, up nearly seven times from 2005, according to the China Internet Development Statistics report. At the same time, the diversification of information demand also increases, which brings different demands to the network. The network has changed from the initial data transmission to the information infrastructure platform which integrates transmission, storage and operation. Therefore, the TCP/IP Internet architecture with IP as the core and information transmission as its purpose is becoming more and more difficult to meet the needs of the development of services. However, the patched technology such as the content distribution network (CDN) makes the TCP/IP network more and more complex. It is difficult to solve many problems such as expansibility, dynamic, security and so on. In recent years, researchers have proposed the information center network Information-Centric Networking (ICNs), a new future network architecture. ICN has the characteristics of data identification, cache in the network, good mobility and so on. Routing communication using address-independent data identity is very suitable for mainstream applications such as video distribution and new mobile applications such as the Internet of things and the network of cars etc. This communication paradigm of content and address decoupling is very suitable for the mainstream applications such as video distribution and so on. Service is the most fundamental embodiment of Internet value. How to achieve efficient service delivery in a new network architecture will be the key to large-scale practical deployment of ICN. At present, Web is the basic service of Internet, and video service is the main consumer of Internet bandwidth. Therefore, this paper will focus on these two types of specific services, the main contributions include the following three aspects: 1) Web services in the ICN to provide the problem, Based on the open source Content-Centric Networking protocol stack CCNx and the open source Tomcat package, this paper proposes and realizes that the Web service container CCNxTomcat.CCNxTomcat for ICN can run on TCP/IP network and ICN simultaneously. Supports smooth migration of services during network evolution. Compared with existing technology, CCNX Tomcat can support higher concurrent users and lower access latency. At the same time, we also deploy CCNxTomcat on the ICN test platform of campus network. Users can access the Web application in ICN through browser. This is of great significance for the practical promotion of ICN. A dynamic request cache ccncache.ccncache for ICN oriented Web server is proposed and implemented, which is composed of count Bloom filter, dictionary tree and hopping list. It is a low latency and high concurrency ICN packet cache. We integrated ccncache into CCNxTomcat and deployed it in the testing environment of the campus network. The experimental data show that compared with the existing cache technology, the query time is reduced by 2.5 times. (3) aiming at the user experience problem of ICN dynamic adaptive streaming media, In this paper, an optimization framework of dynamic adaptive streaming media in ICN wireless networks, BC-DAS.BC-DAS, is proposed and implemented in the ICN network layer. The available bandwidth detection algorithm based on packet pairs is proposed and implemented. In the application layer, Markov decision is used for multi-cache. The multi-rate environment makes the optimal bit-rate adaptation. The experimental data show that the BC-DAS has greatly improved its overall user experience compared with the existing bit-rate adaptation technology. At the same time, the specific video quality indicators such as startup delay, average bit rate, video viewing rate, and video rate are optimized.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TP393.09

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本文編號：1838963