基于SIP协议和应用层组播的视频会议系统研究
发布时间：2018-08-18 11:43
【摘要】：视频会议系统是当前网络视频应用领域最火热的需求之一。传统的视频会议系统大多基于H.32X协议族构建,IETF工作组提出了SIP协议作为H.32X的替代,相比之下具有易搭建、扩展灵活等优点。本文设计了一套基于SIP协议的视频会议系统。简要介绍了SIP协议的信令格式和网络逻辑单元等概念,以及SIP协议的基本呼叫流程,从整体上对SIP有了一定认识。由于SIP协议必须要与其它众多协议协同工作,又简单介绍了SDP协议、RTP协议和RTCP协议等。对视频会议系统的拓扑结构进行了分析,集中式信令流和组播式媒体流拓扑的结构具有较大优势。由于当前网络环境中IP组播技术发展不够成熟,因此提出了应用层组播技术代替IP组播进行媒体流传输。在对比了基于节点综合能力的计算模型和基于RTT平均值的计算模型两种节点可用性计算方式后,将两者结合起来作为本文应用层组播树的构建基础,并说明了组播树维护过程。在分析视频会议系统需求的基础上,给出了系统的总体结构和各模块的功能设计,并结合SIP协议与应用层组播树详细说明了实现细节,从节点间会话协商、会议功能管理、数据传输等角度展示了SIP信令交换的流程。QoS策略为多媒体应用提供网络服务保障,在结合了RTCP报文和应用层组播树的传输方式上,本文提出了局部拥塞和全局拥塞的概念,并设计了完整的拥塞解决方案。最后,以PJSIP和JRTPLIB两个开源的框架为基础,对系统进行了实现,并在测试中验证了其功能的完整性。
[Abstract]:The video conference system is one of the hottest demands in the field of network video application. Most of the traditional video conferencing systems are based on H.32X protocol family. The SIP protocol is proposed as an alternative to H.32X protocol, which has the advantages of easy to build, flexible extension and so on. This paper designs a video conference system based on SIP protocol. This paper briefly introduces the concepts of signaling format and network logic unit of SIP protocol, and the basic call flow of SIP protocol, and has a certain understanding of SIP as a whole. Since the SIP protocol must work with many other protocols, the SDP protocol and RTCP protocol are briefly introduced. The topology structure of video conference system is analyzed. The structure of centralized signaling flow and multicast media flow has great advantages. Because the IP multicast technology is not mature enough in the current network environment, the application layer multicast technology is proposed to replace IP multicast for media stream transmission. After comparing the two computing methods of node availability based on node synthesis ability and RTT average, this paper combines the two models as the basis of constructing the application layer multicast tree, and explains the maintenance process of the multicast tree. On the basis of analyzing the requirements of videoconferencing system, the overall structure of the system and the function design of each module are given. The implementation details are explained in detail by combining SIP protocol and application layer multicast tree, from the nodes to the session negotiation, the conference function management. From the point of view of data transmission, the flow. QoS policy of SIP signaling exchange provides network service guarantee for multimedia applications. In this paper, the concepts of local congestion and global congestion are proposed in combination with RTCP packets and application layer multicast tree. A complete congestion solution is designed. Finally, based on two open source frameworks, PJSIP and JRTPLIB, the system is implemented, and its functional integrity is verified in the test.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN948.63
[Abstract]:The video conference system is one of the hottest demands in the field of network video application. Most of the traditional video conferencing systems are based on H.32X protocol family. The SIP protocol is proposed as an alternative to H.32X protocol, which has the advantages of easy to build, flexible extension and so on. This paper designs a video conference system based on SIP protocol. This paper briefly introduces the concepts of signaling format and network logic unit of SIP protocol, and the basic call flow of SIP protocol, and has a certain understanding of SIP as a whole. Since the SIP protocol must work with many other protocols, the SDP protocol and RTCP protocol are briefly introduced. The topology structure of video conference system is analyzed. The structure of centralized signaling flow and multicast media flow has great advantages. Because the IP multicast technology is not mature enough in the current network environment, the application layer multicast technology is proposed to replace IP multicast for media stream transmission. After comparing the two computing methods of node availability based on node synthesis ability and RTT average, this paper combines the two models as the basis of constructing the application layer multicast tree, and explains the maintenance process of the multicast tree. On the basis of analyzing the requirements of videoconferencing system, the overall structure of the system and the function design of each module are given. The implementation details are explained in detail by combining SIP protocol and application layer multicast tree, from the nodes to the session negotiation, the conference function management. From the point of view of data transmission, the flow. QoS policy of SIP signaling exchange provides network service guarantee for multimedia applications. In this paper, the concepts of local congestion and global congestion are proposed in combination with RTCP packets and application layer multicast tree. A complete congestion solution is designed. Finally, based on two open source frameworks, PJSIP and JRTPLIB, the system is implemented, and its functional integrity is verified in the test.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN948.63
【参考文献】
相关期刊论文 前7条
1 吴吉义;傅建庆;平玲娣;谢琪;;一种对等结构的云存储系统研究[J];电子学报;2011年05期
2 曾彬;张大方;黎文伟;吕磊;;基于节点性能估算的应用层组播算法[J];计算机工程;2009年08期
3 蒋建国;苏兆品;李援;梁立伟;;RTP/RTCP自适应流量控制算法[J];电子学报;2006年09期
4 罗建光;赵黎;杨士强;;基于用户行为分析的应用层组播树生成算法[J];计算机研究与发展;2006年09期
5 张睿琳;戴青;范作栋;武清芳;;基于SIP的视频会议中发言权管理的研究与实现[J];微计算机信息;2006年03期
6 李s，
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