IP多媒体子系统(IMS)作为下一代网络的核心技术,在现代视频会议中广泛采用IMS作为关键技术,以实现高质量的视频会议接入,从而为用户提供可靠的QoS(服务质量)保证.为此,设计并提出了一种基于IMS网络视频会议的QoS保证架构.该架构采用从核心网和承载网多个层次实现IMS网络QoS保证的解决思路,通过上下两个层次保证QoS.上层改进了区分服务(DiffServ)策略控制和计费(PCC)架构,使视频会议中的不同业务(语音,视频,数据)享有不同的优先级,优先级高的业务会享有更优的QoS保证,实现更加灵活的QoS;下层利用多协议标签转换(MPLS)技术以实现对Diff-Serv模型的承载.仿真结果表明,所提出的MPLS网络架构的网络资源占用率要优于普通网络,所采用的整体系统架构有效可行,能够达到优化网络资源、提高服务质量的目的.%As the core technology in next generation network,IP Multimedia Subsystem ( IMS) has been widely used as a key technology in modern video conference. If it is needed to ensure the high quality of video conference access,it is necessary to provide reliable QoS ( Quality of Service) guarantee. A QoS architecture based on IMS network video conference is proposed,in which the method of realizing IMS network QoS guarantee from multiple levels of the core network and bearing network is adopted. It has provided two layers of QoS, the upper of which has improved Differentiated Services ( DiffServ) Policy Control and Charging ( PCC) architecture to make different services ( voice,video,data) in video conference with different priorities. Service with high priority would enjoy better QoS guarantee and therefore more flexible QoS has been achieved in this way. The other layer uses the Multi-Protocol Label Switching ( MPLS) technology to achieve the DiffServ model bearer. The simulation shows that the network resources utilization of it is better than that of common one, as well as effectiveness of overall system and that it has achieved the goal of optimizing network resources and improving QoS.
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