IMS中基于时延的E2E QOS控制机制

An E2E QOS Control Mechanism Based on Session Delay in IMS

分析了IMS现有的基于策略的QOS(服务质量)机制,提出了一种新的基于策略的E2E(端到端)QOS机制.新的机制主要通过SIP协议的扩展、PDF(策略判决功能)功能的改进实现IMS中的各个层次间的相互协作.仿真结果表明,新机制能够有效地改善IMS中的会话建立时延.

IMS(IP Multimedia Subsystem) is proposed by 3GPP to provide real-time multimedia services.In the future,the multimedia services will give priority to video,audio and mixture of video and audio,so they need high quality on real-time and delay.The traditional QOS(Quality of Service) mechanism based on policy is analyzed,and a new QOS mechanism based on policy is proposed.The new mechanism improves the function of PDF(Policy Decision Function) and does some extension to the SIP,so implements the cooperation be...