基于SDN的企业级视频会议系统框架研究

Research on framework for enterprise video conference system based on SDN

研究了在软件定义网络(SDN)上的企业级视频会议服务质量保证问题,设计并实现了视频会议服务质量保证的总体框架.首先,探讨了视频会议内、会议间资源预约及分配机制,建立了视频会议服务质量保证的数学模型;然后,基于OpenDayLight Lithium控制器设计了视频会议服务质量控制框架;最后,详细阐述了该框架中各个模块包括资源矩阵、资源预约和分配、流识别及接入控制的实现机制,分析了以最小成本为目标的多播路由算法的实现方法.分析结果表明:该框架能够有效实现针对每个会议中的每个不同优先级视频流的QoS保证,并在有限时间内适应地调节网络路由,提高了网络资源利用率.

Quality of service(QoS)guarantee issues for enterprise video conference were investigated to realize the control framework in software defined networking(SDN).Firstly,resource reservation and allocation mechanism was comprehensively discussed within and in conferences.A corresponding mathematical model was formulated to minimize the cost for the target.Then,the QoS control framework was designed with OpenDayLight Lithium-based controller.Finally,the functions in the framework including resource matrix,resource reservation and allocation mechanism,flow identification and access control mechanism was elaborated in module and the multicast routing algorithm for the mathematical model was designed and analyzed.Analysis results show that the framework can realize effective QoS guarantee for every video stream with different priority class in every conference,and can adaptively adjust network route in a limited time,improving network resource utilization.