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Method and system for switching between independent networks and keeping call continuity

A technology for inter-network switching and call continuity, which is applied in the field of call continuity and can solve the problems that user equipment cannot be switched and ensure call continuity.

Active Publication Date: 2008-01-16
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention provides a method and system for switching between mutually independent networks and maintaining call continuity, so as to solve the problem that user equipment cannot switch between different domains belonging to two independent networks and ensure call continuity in the prior art. continuity problem

Method used

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  • Method and system for switching between independent networks and keeping call continuity
  • Method and system for switching between independent networks and keeping call continuity
  • Method and system for switching between independent networks and keeping call continuity

Examples

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Embodiment Construction

[0054] Referring to the system shown in Figure 2, the CS domain and the IMS domain are mutually independent networks, and the user terminal UE has two numbers belonging to the CS domain and the IMS domain respectively, and can access the CS domain and the IMS domain by using the two numbers . In the CS domain, the service control SCP can implement the continuous call control function CCCF, in the IMS domain, the application server AS can implement the continuous call control function CCCF, and the media gateway control function MGCF / border gateway control function BGCF can be used as the information in the IMS domain The control function entity of the command plane is used to convert and transmit signaling between the CS domain and the IMS.

[0055] Referring to Fig. 3A, the main processing procedure for switching a user who has established a call in the CS domain to the IMS domain is as follows:

[0056] Step 300, the user terminal in the CS domain requests to switch the cal...

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Abstract

The invention discloses a method for switching between independent networks while maintaining call continuity to solve the problem of the prior arts that a user cannot switch between different domains belonging to independent networks while ensuring call continuity. The method includes that a user terminal which has established a call in an circuit exchange CS domain requests for switching the call into an IMS domain, in which the CS domain and the IMS domain belong to two independent networks respectively; a continuous call control functional CCCF entity in the CS domain connects the call into the IMS domain; a SIP session controlling program of the CCCF entity in the IMS domain establishes an IMS session path between the user terminal and the calling terminal; and the user terminal releases CS call after the IMS session path is established. The invention also discloses a communication system.

Description

technical field [0001] The invention relates to the call continuity technology in the communication field, in particular to a method and system for switching between mutually independent networks and maintaining call continuity. Background technique [0002] At present, 3G technology has gradually matured and has been put into commercial use in many countries and regions around the world. The proposal of IP Multimedia Subsystem (IMS) provides a solution for multimedia services in mobile networks. The 3G network adopts a network structure in which bearer and control are separated, and supports multiple bearer modes of ATM, IP, and TDM. [0003] The network is divided into circuit switched domain, IP multimedia domain and packet switched domain. The circuit switching domain uses circuit switching technology to provide voice and multimedia services, similar to the 2G system; the packet switching domain provides IP connectivity for users, and users can use this to access the I...

Claims

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Application Information

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IPC IPC(8): H04Q7/38H04L12/56H04W36/14H04L29/06H04W76/00
Inventor 马其锋
Owner HUAWEI TECH CO LTD
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