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Implementation method of final calling in IP multimedia subsystem

A technology of a multimedia subsystem and an implementation method, which is applied in the field of terminal call implementation, can solve problems such as waste of network resources, and achieve the effects of small impact, convenient technology upgrade, and small technical change

Inactive Publication Date: 2008-07-30
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0030] From the above call termination process, it can be seen that if the UE is located in the home network of the calling user, or if the UE and the calling user are located in the same visited network at the same time, there will be a circuitous routing phenomenon of the media stream shown in Figure 2, which will affect network resources. cause a lot of waste

Method used

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  • Implementation method of final calling in IP multimedia subsystem
  • Implementation method of final calling in IP multimedia subsystem
  • Implementation method of final calling in IP multimedia subsystem

Examples

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no. 1 example

[0061] Fig. 5 is a flowchart of a method for implementing call termination in an IMS network according to the first embodiment of the present invention. In this embodiment, the UE roams to the visited network, and the calling user on the same network initiates a session request to it; the P-CSCF serves as the decision point to make a local transfer-out function decision, and adds the permission to use the session request to the session request according to the decision result The local switch-out flag of the local switch-out function, according to which the UE uses the local switch-out function. The steps in the figure are as follows:

[0062] S501) The user terminal (UE) is in a roaming state, at this time, the calling user calls the UE, and sends a session request (INVITE message) to the S-CSCF currently serving the UE;

[0063] S502) The S-CSCF forwards the session request to the P-CSCF;

[0064] S503) After the P-CSCF receives the session request, from the corresponding ...

no. 2 example

[0089] Fig. 6 is a flowchart of a method for implementing call termination in an IMS network according to the second embodiment of the present invention. In this embodiment, the UE roams to the visited network, and the calling user on the same network initiates a session request to it; the P-CSCF serves as the decision point to make a decision on the local transfer-out function, and adds the disallowed function to the session request according to the decision result. Local rollout flag using the local rollout feature. The steps in the figure are as follows:

[0090] S601) The user terminal (UE) is in a roaming state, at this time the calling user calls the UE, and sends a session request (INVITE message) to the S-CSCF currently serving the UE;

[0091] S602) The S-CSCF forwards the session request to the P-CSCF;

[0092] S603) After receiving the session request, the P-CSCF interacts with the corresponding policy server (for example, the PCRF of the home network: PCRF-1) to ...

no. 3 example

[0106] Fig. 7 is a flowchart of a method for implementing call termination in an IMS network according to the third embodiment of the present invention. In this embodiment, the UE roams to the visited network, and the calling user on the same network initiates a session request to it; the S-CSCF serves as a decision point to make a local transfer-out function decision, and adds the permission to use the session request to the session request according to the decision result The local switch-out flag of the local switch-out function, according to which the UE uses the local switch-out function. The steps in the figure are as follows:

[0107] S701) The user terminal (UE) is in a roaming state, at this time, the calling user calls the UE, and sends a session request (INVITE message) to the S-CSCF currently serving the UE;

[0108] S702) The S-CSCF makes a local transfer-out function decision according to the local transfer-out policy information stored locally or obtained from ...

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Abstract

A method of terminating in IP Multimedia System (IMS) is provided. When a Terminal Originating a Call (TLO) initiates a conversation request to a Terminal Terminating a Call (TLT) roaming to the visiting network, an IMS network element receives a conversation request and determines whether the TLT is accessible to the local call transfer-out function in the conversation corresponding to the request and transmits the conversation request to the TLT after adding the local call transfer-out tag to the conversation request. The invention of the terminating effectively solves the problem of the media route alternation of the local terminating in the roaming service condition and modifies prior art of the IMS network slightly, which only relates to an individual network element modification, a partial process addition and a proper modification of the header field. The invention has a slight influence on prior IMS network structure and facilitates the technical update.

Description

technical field [0001] The invention relates to the communication field, in particular to a method for realizing call termination in an IP (Internet Protocol, Internet Protocol) multimedia subsystem. Background technique [0002] IMS (IP Multimedia Subsystem, IP Multimedia Subsystem) is the third generation partnership organization (3 rd Generation Partnership Project (referred to as 3GPP) is a next-generation network standard. Its notable feature is that it adopts the Session Initiation Protocol (SIP) system, and communication has nothing to do with access. It can have a variety of media service control functions and Separation of bearer capacity, call and session, application and service, service and network, and integration of mobile network and Internet services. The proposal of IMS conforms to the development trend of communication network integration. [0003] The main functional entities in the IMS system include: Call Session Control Function (CSCF for short) that ...

Claims

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Application Information

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IPC IPC(8): H04Q7/38H04Q7/22H04L12/56H04L29/06
Inventor 陈志峰
Owner ZTE CORP
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