| IMS(IP Multimedia Subsystem) is a brand new multimedia service platform, and it can provide customers more fresh types , more diversifications in multimedia services. At present, IMS is regarded as the core technique of the next generation networks,and ,also it is the most important way to converge voice,data and video service. Meanwhile IMS is evoluting sharply and the related standards are reaching agreements gradually.In this paper, the evolution of charging policy in IMS is pointed out, and the way of using policy control in IMS is analysed, and also this paper gives a short introduction of related protocols like Diameter and PCIM. At last, one prototype of the key network element in IMS, PDF, is emulated and the concerned results are analysed and listed. |
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