基于SDN分层组播的视频会议系统研究

发布时间：2018-01-01 14:10

本文关键词：基于SDN分层组播的视频会议系统研究　出处：《中国科学技术大学》2017年硕士论文　论文类型：学位论文

【摘要】：近几年,互联网通信技术得到长足发展,极大地促进了视频会议系统的研发与应用,使得传统的会议召开模式得以改变,给人类社会生活带来了重大变革。当前主流的多点视频会议系统主要基于多点控制单元(MCU)来实现,尽管技术较为成熟,但是随着用户数增长会消耗大量的网络资源,使得视频业务的服务质量往往难以得到保证。可伸缩视频编码(SVC)和软件定义网络(SDN)等领域的相关研究为传统视频会议系统的困境提供了新的应对方法。可伸缩视频编码技术以分层编码和选择性传输作为实现可伸缩的主要手段,通过分层编码,使得同一视频源可以对应不同的帧率、分辨率或是质量层次,为不同的信道和用户终端发送合适层次的视频,显著降低传输成本。软件定义网络的新模式将传统网络设备的控制面与数据面相分离,极大地优化了网络流管理,使得网络资源的利用更为高效。本文根据视频会议系统的基本需求,提出了一种基于SDN分层组播的新型视频会议系统架构和相应的分层组播树实现算法。主要工作概括如下:首先,对系统实现原理进行了详细的阐述,设计并说明了系统的总体架构和各模块的具体功能。整个系统通过可伸缩视频编码实现分层组播流以满足会议用户的不同性能需求。SDN控制器实时监控网络状态信息并动态地管理调节视频层数。此外,设计会议管理服务器对会议成员与业务进行管理,舍弃了互联网组管理协议(IGMP)和MCU等专业硬件设备。其次,为了实现上述架构,设计了基于DCSPFA_MPH的分层组播树生成算法和相应的组播树动态调整算法,可以根据链路带宽、时延信息以及各层视频的码率,为每层视频选择合适的组播路径,最大限度地利用网络带宽等资源,提高服务质量,满足用户动态QoS需求。最后,进行了多用户仿真实验测试算法性能,并搭建了简易的原型系统进行系统功能验证和网络自适应测试。实验结果表明,本系统提供了灵活可控的分层视频组播服务,能够在保证视频会议服务质量的同时节约宝贵的网络资源。
[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.
【学位授予单位】：中国科学技术大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN948.63

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