本文選題：軟件定義網(wǎng)絡(luò) + 可伸縮視頻編碼�。� 參考：《中國科學(xué)技術(shù)大學(xué)》2017年博士論文

【摘要】：近年來隨著網(wǎng)絡(luò)與多媒體技術(shù)的進(jìn)步,諸如互聯(lián)網(wǎng)電視、視頻會(huì)議、視頻點(diǎn)播、網(wǎng)絡(luò)視頻監(jiān)控、虛擬現(xiàn)實(shí)等多媒體應(yīng)用越來越深入到人們的生產(chǎn)和生活中。隨之而來的是網(wǎng)絡(luò)中IP流量的急速增長,而快速增長的網(wǎng)絡(luò)資源消耗,可引發(fā)網(wǎng)絡(luò)擁塞、傳輸時(shí)延變大等問題,最終會(huì)降低多媒體業(yè)務(wù)的服務(wù)質(zhì)量,導(dǎo)致用戶體驗(yàn)變差,因此需要尋求新的機(jī)制、架構(gòu)和算法對多媒體傳輸業(yè)務(wù)進(jìn)行優(yōu)化。網(wǎng)絡(luò)承載的業(yè)務(wù)不斷豐富,當(dāng)前互聯(lián)網(wǎng)出現(xiàn)了諸如體系臃腫、服務(wù)質(zhì)量保障缺失等方面的問題,因此學(xué)術(shù)與產(chǎn)業(yè)界正在探索建立新的網(wǎng)絡(luò)體系架構(gòu)。軟件定義網(wǎng)絡(luò)(Software Defined Networking,SDN)近年來被提出,因其支持服務(wù)可編程、網(wǎng)絡(luò)可控等優(yōu)勢被業(yè)界認(rèn)為是下一代互聯(lián)網(wǎng)的發(fā)展方向。利用多媒體編解碼的先進(jìn)技術(shù)、網(wǎng)絡(luò)優(yōu)化理論、在線網(wǎng)絡(luò)測量以及組播技術(shù)等手段,研究在軟件定義網(wǎng)絡(luò)中的多媒體傳輸機(jī)制、架構(gòu)和算法,對于解決多媒體傳輸存在的問題具有重要意義。為了保證網(wǎng)絡(luò)多媒體的服務(wù)質(zhì)量,優(yōu)化網(wǎng)絡(luò)資源的利用率,本文研究了在軟件定義網(wǎng)絡(luò)環(huán)境下的多媒體組播傳輸控制與優(yōu)化問題,主要研究工作概括如下:1)軟件定義可伸縮視頻組播系統(tǒng)架構(gòu)的研究。利用SDN提供的網(wǎng)絡(luò)可控、可編程的特點(diǎn),針對可伸縮視頻,本文研究如何構(gòu)建在軟件定義網(wǎng)絡(luò)中的多媒體業(yè)務(wù)組播服務(wù)系統(tǒng)。為了使網(wǎng)絡(luò)轉(zhuǎn)發(fā)節(jié)點(diǎn)支持對視頻內(nèi)容的感知、實(shí)現(xiàn)完全可控的組播,本文設(shè)計(jì)了管理子系統(tǒng),同時(shí)定義了視頻服務(wù)系統(tǒng)中的功能實(shí)體并設(shè)計(jì)了組成功能實(shí)體的各個(gè)模塊。為了滿足系統(tǒng)對服務(wù)質(zhì)量(Quality of Service,QoS)的支持,本文提出了在軟件定義視頻組播系統(tǒng)中鏈路帶寬和網(wǎng)絡(luò)時(shí)延的測量方法。針對系統(tǒng)在實(shí)際網(wǎng)絡(luò)中部署時(shí)存在的域間和跨ISP服務(wù)問題,本文提出了支持大規(guī)模網(wǎng)絡(luò)的域間與多ISP部署服務(wù)解決方案。在提出架構(gòu)的基礎(chǔ)上,我們搭建了軟件定義可伸縮視頻組播的原型系統(tǒng),進(jìn)行了相關(guān)實(shí)驗(yàn)以評估系統(tǒng)的性能。實(shí)驗(yàn)表明,提出的架構(gòu)能夠?qū)崿F(xiàn)可伸縮視頻在軟件定義網(wǎng)絡(luò)下的組播傳輸業(yè)務(wù),能夠達(dá)到優(yōu)化網(wǎng)絡(luò)資源利用的目的。2)軟件定義網(wǎng)絡(luò)中可伸縮視頻自適應(yīng)組播傳輸策略的研究。本文提出的軟件定義可伸縮視頻組播系統(tǒng)架構(gòu)中,管理服務(wù)器的策略模塊支持路由計(jì)算、組播樹構(gòu)建、視頻傳輸控制等算法的定制,可以根據(jù)不同的場景、應(yīng)用和需求部署不同的策略。本文提出了在軟件定義網(wǎng)絡(luò)中具有可用帶寬和時(shí)延約束的組播路由算法,根據(jù)SDN控制器中的網(wǎng)絡(luò)拓?fù)浜玩溌窢顟B(tài)等信息,構(gòu)建具有QoS約束的最小代價(jià)視頻組播樹;同時(shí)本文提出了基于等效帶寬估計(jì)的組播自適應(yīng)調(diào)節(jié)控制策略,可伸縮視頻在SDN網(wǎng)絡(luò)傳輸過程中,系統(tǒng)可以依據(jù)網(wǎng)絡(luò)狀態(tài)信息檢測到網(wǎng)絡(luò)鏈路擁塞,依據(jù)相應(yīng)層數(shù)選擇算法在網(wǎng)絡(luò)內(nèi)部動(dòng)態(tài)地調(diào)節(jié)可伸縮視頻的傳輸層數(shù),保證用戶的觀看體驗(yàn)。我們在原型系統(tǒng)中進(jìn)行了相關(guān)實(shí)驗(yàn),實(shí)驗(yàn)結(jié)果表明提出的算法和策略能夠有效避免網(wǎng)絡(luò)鏈路擁塞,顯著提高視頻業(yè)務(wù)的服務(wù)質(zhì)量。3)軟件定義網(wǎng)絡(luò)中基于分層組播的視頻會(huì)議系統(tǒng)研究。本文在軟件定義網(wǎng)絡(luò)中,基于可伸縮視頻編解碼技術(shù)和網(wǎng)絡(luò)組播技術(shù)部署視頻會(huì)議服務(wù)。在基于MCU的視頻會(huì)議系統(tǒng)中,由于集中式的MCU具有很高的負(fù)載,極有可能成為系統(tǒng)的瓶頸,難以確保較高的QoS;而采用P2P技術(shù)部署的視頻會(huì)議系統(tǒng),成員上行網(wǎng)絡(luò)帶寬資源的限制也可能導(dǎo)致服務(wù)的中斷。本文提出的系統(tǒng)中,集中式會(huì)議管理服務(wù)器只負(fù)責(zé)管理會(huì)議,而不接收和處理來自會(huì)議成員的媒體數(shù)據(jù)。會(huì)議管理服務(wù)器通過網(wǎng)絡(luò)控制器提供的接口獲取網(wǎng)絡(luò)拓?fù)湫畔�、網(wǎng)絡(luò)可用帶寬和路徑時(shí)延等狀態(tài)信息,從而為SVC視頻流建立具有QoS約束的組播樹,并在服務(wù)過程中采用基于等效帶寬估計(jì)的可伸縮視頻自適應(yīng)組播傳輸策略,動(dòng)態(tài)地調(diào)節(jié)網(wǎng)絡(luò)中傳輸?shù)囊曨l流。實(shí)驗(yàn)結(jié)果表明,所提出的系統(tǒng)不僅可以提供靈活可控的視頻會(huì)議組播傳輸,而且可以減少網(wǎng)絡(luò)帶寬的使用,保證視頻會(huì)議的服務(wù)質(zhì)量。
[Abstract]:In recent years, with the progress of network and multimedia technology, such as Internet television, video conferencing, video on demand, network video surveillance, virtual reality and so on, multimedia applications are becoming more and more deep into people's production and life. The rapid growth of IP traffic in the network is followed, and the rapid growth of network resources can lead to network support. Problems such as plug and transmission delay will eventually reduce the service quality of multimedia services and lead to the deterioration of user experience. Therefore, we need to seek new mechanisms, architecture and algorithms to optimize the multimedia transmission service. The network is rich in service, and the current Internet has appeared in such aspects as overstaffed system and lack of quality of service. Therefore, the academic and industrial circles are exploring the establishment of a new network architecture. Software Defined Networking (SDN) has been proposed in recent years, because its support service is programmable, and the advantages of network controllability are considered to be the development side of the next generation Internet. The advanced technology of multimedia codec is used to optimize network. Theory, online network measurement and multicast technology are used to study multimedia transmission mechanism, architecture and algorithm in software defined network. It is of great significance to solve the problem of multimedia transmission. In order to guarantee the quality of network multimedia service and optimize the utilization of network resources, this paper studies the definition of network loop in software. The main work of multimedia multicast transmission control and optimization is summarized as follows: 1) the research of software definition scalable video multicast architecture. Using the network controllable and programmable features provided by SDN, this paper studies how to construct multimedia service multicast service system in the software definition network. In order to enable the network forwarding node to support the perception of video content and realize the completely controllable multicast, this paper designs a management subsystem, defines the functional entities in the video service system and designs the modules that make up the functional entities. In order to satisfy the support of Quality of Service (QoS), this paper puts forward in this paper The software defines the measurement method of link bandwidth and network delay in video multicast system. Aiming at the problem of inter domain and cross ISP service in the actual network deployment, this paper proposes a solution for inter domain and multi ISP deployment services to support large-scale networks. The prototype system of frequency multicast has carried out some experiments to evaluate the performance of the system. The experiment shows that the proposed architecture can achieve multicast transmission service in the software defined network, and can achieve the purpose of optimizing the use of network resources.2) the research of extensible video Adaptive multicast transmission strategy in the software definition network. In the framework of software definition scalable video multicast system, the policy module of management server supports routing computing, multicast tree construction, video transmission control and other algorithms. It can deploy different strategies according to different scenarios, applications and requirements. This paper proposes that the bandwidth and delay constraints are available in the software definition network. The multicast routing algorithm is based on the network topology and link state in the SDN controller to construct the minimum cost video multicast tree with QoS constraints. At the same time, this paper proposes a multicast adaptive control strategy based on the equivalent bandwidth estimation. In the SDN network transmission process, the scalable video can be based on the network state information detection. The network link congestion is measured, and the number of scalable video transmission layers is dynamically adjusted within the network according to the corresponding layer number selection algorithm, and the user's viewing experience is guaranteed. We have carried out the related experiments in the prototype system. The experimental results show that the proposed algorithm and strategy can effectively avoid network link congestion and significantly improve the service of video service. .3 in software definition network based on layered multicast video conferencing system. In this paper, video conference services are deployed based on scalable video codec technology and network multicast technology in software defined networks. In MCU based video conferencing systems, because centralized MCU has a high load, it is very likely to become a system A bottleneck is difficult to ensure a higher QoS; and a video conferencing system deployed by P2P technology may also lead to a disruption in service. In this paper, a centralized conference management server is responsible for managing meetings only without receiving and handling media data from members of the conference. Conference management services By using the interface provided by the network controller, the network topology information is obtained, the network available bandwidth and path delay and other state information are used to establish a multicast tree with QoS constraints for the SVC video stream, and the scalable video Adaptive multicast transmission strategy based on the equivalent bandwidth estimation is adopted in the service process, which dynamically regulates the transmission in the network. The experimental results show that the proposed system can not only provide flexible and controllable multicast transmission of video conferencing, but also reduce the use of network bandwidth and ensure the quality of video conferencing service.
【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN919.8

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