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Method and system for accessing termination call through visited IMS (IP Multimedia System) access point

A technology of visiting places and access points, which is applied in the field of IP multimedia subsystem access function access, and can solve the problem of occupying CS long-distance link resources, etc.

Inactive Publication Date: 2012-04-18
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The disadvantage of the existing technology is that even if the visited network of UE-1 has IMS network access capability, UE-1 will not use the IMS of the visited network of UE-1 when UE-1 is in the CS domain. Network access capability, thus occupying the long-distance link resources of the CS

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  • Method and system for accessing termination call through visited IMS (IP Multimedia System) access point
  • Method and system for accessing termination call through visited IMS (IP Multimedia System) access point
  • Method and system for accessing termination call through visited IMS (IP Multimedia System) access point

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Embodiment 1

[0047] figure 2 It is a flow chart of Embodiment 1 of the method of accessing the terminal call through the visited IMS access point in the present invention, as shown in figure 2 As shown, the application scenario of this example is that the IMS user terminal UE-1 registers to the IMS domain through the VICP, but the MSC does not provide the IMS access function. The domain accepts the voice call of UE-2. In this example, the method for terminating the call through the visited IMS access point specifically includes the following steps:

[0048] Step 201, UE-1 performs IMS registration using the identity A through the PS domain of the visited network, and the registration process passes VICP;

[0049] Step 202, UE-2 calls UE-1, for example, sending a call message such as an INVITE message targeting the identity A of UE-1;

[0050] Step 203, the call message (such as the INVITE message) is routed to the home IMS network of UE-1, and routed to the SCC AS by the CSCF of the ho...

Embodiment 2

[0061] image 3 The flow chart of Embodiment 2 of the method for accessing the terminal call through the visited IMS access point of the present invention, as shown in image 3 As shown, the application scenario of this example is that the IMS user terminal UE-1 registers to the IMS domain through the VICP, the MSC provides the IMS access function, and the MSC may replace UE-1 for IMS registration (that is, UE-1 has two IMS registration ), the registration process of MSC may pass through VICP (whether it does not affect the implementation of the technical solution of the present invention), because the PS domain of the visited network does not provide voice capability, it can only accept the voice call of UE-2 in the CS domain, including the following steps:

[0062] Step 301, UE-1 performs IMS registration through the PS domain of the visited location using the identifier A, and the registration process passes VICP;

[0063] Step 302, MSC uses identity B to replace UE-1 to p...

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Abstract

The invention discloses a method for accessing a termination call through a visited IMS (IP Multimedia System) access point. The method comprises the following steps: when an SCC AS (Service Centralization and Continuity Application Server) receives a call request to a called subscriber and ascertains that the called subscriber is accessed at a CS (Circuit Switch) domain, the SCC AS obtains identification information of the called subscriber CS domain and calls the called subscriber via a PS (Packet Switch) domain, and a calling massage carries identification information of the called subscriber CS domain; and a VICP (Virtual International Connecting Point) calls the called subscriber via the CS domain according to the identifier of the called subscriber CS domain, carried in the calling massage. The invention also discloses a system for accessing the termination call through the visited IMS (IP Multimedia System) access point, which is used for implementing the method. According to the invention, occupation to CS long-distance link resource is reduced to a certain extent.

Description

technical field [0001] The present invention relates to the access technology of the IP Multimedia Subsystem (IMS, IPMultimedia Core Network Subsystem) access function of the called user that the network of the visited place does not support, and in particular to a method for accessing the terminal call through the IMS access point of the visited place and system. Background technique [0002] IMS is an IP-based network architecture proposed by the 3rd Generation Partnership Project (3GPP, 3rd Generation Partnership Project), which builds an open and flexible service environment, supports multimedia applications, and can provide users with rich multimedia services. [0003] In the IMS service system, the control layer and the service layer are separated, and the control layer does not provide specific services, but only provides necessary functions such as triggering, routing, and charging to the service layer. [0004] The service triggering and control functions in the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06H04L1/16H04W76/16
CPCH04W76/026H04W76/16
Inventor 谢振华
Owner ZTE CORP