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

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

Method and system for switching between mutually independent networks and maintaining call continuity technical field 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 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. 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 d...

AI Technical Summary

Problems solved by technology

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

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