本文關(guān)鍵詞：基于SDN分層組播的視頻會(huì)議系統(tǒng)研究　出處：《中國(guó)科學(xué)技術(shù)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 軟件定義網(wǎng)絡(luò) 可伸縮視頻編碼 組播 視頻會(huì)議系統(tǒng)

【摘要】：近幾年,互聯(lián)網(wǎng)通信技術(shù)得到長(zhǎng)足發(fā)展,極大地促進(jìn)了視頻會(huì)議系統(tǒng)的研發(fā)與應(yīng)用,使得傳統(tǒng)的會(huì)議召開模式得以改變,給人類社會(huì)生活帶來了重大變革。當(dāng)前主流的多點(diǎn)視頻會(huì)議系統(tǒng)主要基于多點(diǎn)控制單元(MCU)來實(shí)現(xiàn),盡管技術(shù)較為成熟,但是隨著用戶數(shù)增長(zhǎng)會(huì)消耗大量的網(wǎng)絡(luò)資源,使得視頻業(yè)務(wù)的服務(wù)質(zhì)量往往難以得到保證�？缮炜s視頻編碼(SVC)和軟件定義網(wǎng)絡(luò)(SDN)等領(lǐng)域的相關(guān)研究為傳統(tǒng)視頻會(huì)議系統(tǒng)的困境提供了新的應(yīng)對(duì)方法�？缮炜s視頻編碼技術(shù)以分層編碼和選擇性傳輸作為實(shí)現(xiàn)可伸縮的主要手段,通過分層編碼,使得同一視頻源可以對(duì)應(yīng)不同的幀率、分辨率或是質(zhì)量層次,為不同的信道和用戶終端發(fā)送合適層次的視頻,顯著降低傳輸成本。軟件定義網(wǎng)絡(luò)的新模式將傳統(tǒng)網(wǎng)絡(luò)設(shè)備的控制面與數(shù)據(jù)面相分離,極大地優(yōu)化了網(wǎng)絡(luò)流管理,使得網(wǎng)絡(luò)資源的利用更為高效。本文根據(jù)視頻會(huì)議系統(tǒng)的基本需求,提出了一種基于SDN分層組播的新型視頻會(huì)議系統(tǒng)架構(gòu)和相應(yīng)的分層組播樹實(shí)現(xiàn)算法。主要工作概括如下:首先,對(duì)系統(tǒng)實(shí)現(xiàn)原理進(jìn)行了詳細(xì)的闡述,設(shè)計(jì)并說明了系統(tǒng)的總體架構(gòu)和各模塊的具體功能。整個(gè)系統(tǒng)通過可伸縮視頻編碼實(shí)現(xiàn)分層組播流以滿足會(huì)議用戶的不同性能需求。SDN控制器實(shí)時(shí)監(jiān)控網(wǎng)絡(luò)狀態(tài)信息并動(dòng)態(tài)地管理調(diào)節(jié)視頻層數(shù)。此外,設(shè)計(jì)會(huì)議管理服務(wù)器對(duì)會(huì)議成員與業(yè)務(wù)進(jìn)行管理,舍棄了互聯(lián)網(wǎng)組管理協(xié)議(IGMP)和MCU等專業(yè)硬件設(shè)備。其次,為了實(shí)現(xiàn)上述架構(gòu),設(shè)計(jì)了基于DCSPFA_MPH的分層組播樹生成算法和相應(yīng)的組播樹動(dòng)態(tài)調(diào)整算法,可以根據(jù)鏈路帶寬、時(shí)延信息以及各層視頻的碼率,為每層視頻選擇合適的組播路徑,最大限度地利用網(wǎng)絡(luò)帶寬等資源,提高服務(wù)質(zhì)量,滿足用戶動(dòng)態(tài)QoS需求。最后,進(jìn)行了多用戶仿真實(shí)驗(yàn)測(cè)試算法性能,并搭建了簡(jiǎn)易的原型系統(tǒng)進(jìn)行系統(tǒng)功能驗(yàn)證和網(wǎng)絡(luò)自適應(yīng)測(cè)試。實(shí)驗(yàn)結(jié)果表明,本系統(tǒng)提供了靈活可控的分層視頻組播服務(wù),能夠在保證視頻會(huì)議服務(wù)質(zhì)量的同時(shí)節(jié)約寶貴的網(wǎng)絡(luò)資源。
[Abstract]:In recent years, the rapid development of Internet communication technology has greatly promoted the development and application of videoconferencing system, which has changed the traditional conference convening mode. The current mainstream multi-point video conferencing system is mainly based on multi-point control unit (MCU) to achieve, although the technology is more mature. However, as the number of users increases, a lot of network resources will be consumed. The quality of service (QoS) of video services is often difficult to guarantee. Scalable Video coding (SVCC) and Software defined Network (SDN)). Scalable video coding technology takes layered coding and selective transmission as the main means to achieve scalability. By layered coding, the same video source can correspond to different frame rate, resolution or quality levels, and send appropriate layers of video for different channels and user terminals. The new mode of software defined network separates the control surface of traditional network equipment from the data surface, and greatly optimizes the network flow management. Make the use of network resources more efficient. According to the basic needs of video conferencing system. A new video conference system architecture based on SDN hierarchical multicast and the corresponding hierarchical multicast tree implementation algorithm are proposed. The main work is summarized as follows: firstly, the principle of the system implementation is described in detail. The overall architecture of the system and the specific functions of each module are designed and explained. The whole system realizes hierarchical multicast stream through scalable video coding to meet the different performance requirements of conference users. SDN controller real-time monitoring network. State information and dynamically manage and adjust the number of video layers. Design the conference management server to manage the meeting members and business, abandon the Internet Group Management Protocol (IGMP) and MCU and other professional hardware equipment. Secondly, in order to achieve the above architecture. The hierarchical multicast tree generation algorithm based on DCSPFA_MPH and the corresponding multicast tree dynamic adjustment algorithm are designed, which can be based on link bandwidth, delay information and the bit rate of each layer of video. Select the appropriate multicast path for each layer of video, maximize the use of network bandwidth and other resources, improve the quality of service, to meet the needs of dynamic QoS users. Finally, multi-user simulation experiments are carried out to test the performance of the algorithm. A simple prototype system is built for system function verification and network adaptive testing. The experimental results show that the system provides a flexible and controllable layered video multicast service. Can ensure the quality of video conferencing services while saving valuable network resources.
【學(xué)位授予單位】：中國(guó)科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN948.63

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