Method and system for communication from public telephone switching network to IP multimedia subsystem

Abstract

The invention discloses a method for communicating from a public telephone switching network to an IP multimedia subsystem. The method comprises: inserting a strategy at the side of the public telephone switching network in the IP bearer network transmission layer at the junction point between the IP multimedia subsystem and the public telephone switching network Execution unit; the media gateway control functional entity in the IP multimedia subsystem sends a service quality authorization request to the resource admission control subsystem after receiving the service request from the public switched telephone network; the resource admission control subsystem sends the service quality authorization request according to the service quality authorization request , complete the service quality assurance process, and send the service quality policy to the policy execution unit; the policy execution unit installs the service quality policy. At the same time, the invention also discloses a communication system. The invention controls the service quality of the data flow from PSTN to IP multimedia subsystem by adding a policy execution unit on the side of the public telephone switching network in the IP bearer network transmission layer.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a method and system for communicating from a Public Switched Telephone Network (PSTN) to an Internet Protocol Multimedia Subsystem (IP Multimedia Subsystem, IMS). Background technique [0002] With the continuous increase of the scale of the Internet (Internet), various network services emerge one after another, and advanced multimedia communication systems emerge in endlessly. Since real-time services are sensitive to characteristics such as network transmission delay and delay jitter, when there are services such as text transfer protocol (FTP) or hypertext transfer protocol (HTTP) containing image files on the network, the real-time service will be greatly affected; on the other hand, because multimedia services take up a large amount of bandwidth, it is difficult to obtain reliable transmission of key services to be guaranteed by the existing network. Therefore...

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Problems solved by technology

However, there is no policy execution unit controlled by the RACS system at the junction of the PSTN network and the IMS network, and it is impossible to complete the QoS resource management control of the data flow entering the IMS network from the PSTN network

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