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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DiffServ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 of NGN, IP Multimedia Subsystem (IMS) widely applies IMS as a key technology in modern video conferencing for high-quality video conference access, thereby providing users with reliable QoS (Quality of Service) guarantee. To this end, we design and propose a QoS guarantee architecture based on IMS network video conference. The architecture adopts the solution idea of implementing QoS guarantee of IMS network from multiple layers of the core network and the bearer network, and ensures QoS through two levels. The upper layer improves the DiffServ policy control and accounting (PCC) architecture so that different services (voice, video and data) in video conferencing have different priorities, and higher priority services enjoy better QoS guarantee , To achieve more flexible QoS; the underlying use of multi-protocol label conversion (MPLS) technology to achieve the DiffServ model of the bearer. The simulation results show that the proposed MPLS network architecture has better network resource utilization than the common network, and the overall system architecture adopted is effective and feasible, which can optimize the network resources and improve the service quality.