Roaming Gateway IMS CS Network Service Continuity
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Solution Overview
Problem
Current wireless communication systems lack the ability to provide supplementary services to mobile stations when they roam from an Internet Protocol Multimedia Subsystem (IMS) network to a Circuit Switched (CS) network, resulting in incomplete service provision and control.
Innovation Solution
A method and system that utilizes a roaming gateway to receive authentication requests, acquire and verify authentication and service information, and send authentication success messages and service information between the IMS and CS networks, enabling the provision of IMS services in the CS network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mobile station roams from an IMS network to a CS network, then voice service can be provided, but supplementary services serviced by the IMS network cannot be provided or controlled
Solution Approach 1:
The patent introduces an application server as an intermediary component that mediates between the CS network and IMS network. This application server receives service information from the HSS, determines which supplementary services the roaming mobile station is entitled to, and provides these services in the CS network environment, thus enabling service continuity without requiring complex direct integration between networks
Solution Approach 2:
The application server performs multiple functions: it acts as an authentication helper, service information manager, and supplementary service provider. By consolidating these functions in a single component, the system achieves versatile service provision across different network types without proportionally increasing overall system complexity
2Reliability
If authentication and service information are acquired and verified for roaming mobile stations, then service continuity is enabled, but authentication and service control complexity increases
Solution Approach 1:
The system performs preliminary authentication and service information acquisition during the initial roaming setup phase. The application server obtains service information from the HSS in advance and stores it locally, so that when the mobile station needs supplementary services, the authentication and service determination can be performed quickly without repeated complex queries to the home network
Solution Approach 2:
The application server implements a feedback mechanism where it continuously monitors service usage and authentication status of roaming mobile stations. When service information changes or authentication status updates, the system automatically refreshes and retransmits relevant information to maintain service continuity, creating a self-regulating authentication system
Data Source
AI summary
A method and apparatus for providing roaming service in a wireless communication system. A roaming gateway for performing communication between an Internet protocol multimedia subsystem (IMS) network and a circuit switched (CS) network receives an authentication request for a roaming mobile station (MS), which roams from an IMS network to a CS network, from a mobile service center (MSC) of the CS network, acquires authentication information for the roaming MS and service information for services, with which the roaming MS has been provided from the IMS network, at the authentication request, checks if the roaming MS is entitled to use the services according to the service information by using the authentication information and the service information, and sends an authentication success message to the MSC when the roaming MS is entitled to use the services.