AGCF Intermediary for Traditional Terminal IMS Access
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Solution Overview
Problem
Traditional terminal users, such as POTS and ISDN users, cannot access the IP Multimedia Subsystem (IMS) domain due to the lack of integration with the IMS system architecture, which complicates service management and expansion.
Innovation Solution
The method involves allocating IMS domain user identification to traditional terminal users through an access gateway control function (AGCF) entity, establishing a mapping relation between user identification and line identification, and using SIP messages to facilitate communication between the AGCF entity and the IMS domain, ensuring secure communication and simplifying user authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional terminal users (POTS/ISDN) are integrated into the IMS domain, then service management and expansion are simplified, but the network architecture complexity increases due to the need for AGCF entities and protocol conversions
Solution Approach 1:
The AGCF entity serves as an intermediary between traditional terminal users and the IMS domain. It performs protocol conversion between circuit-switched signaling and SIP protocols, enabling traditional users to access IMS services without requiring changes to their terminals or core IMS architecture. This mediator approach simplifies service management while containing architecture complexity to a specific gateway component.
2Adaptability or versatility
If traditional terminal users access the IMS domain, then unified value-added services are provided, but authentication and security requirements increase
Solution Approach 1:
The AGCF entity acts as a security intermediary that handles authentication for traditional terminal users. It validates user credentials and establishes secure sessions before allowing access to the IMS domain. This approach provides unified service access while maintaining security by centralizing authentication functions in the gateway rather than requiring terminal users to implement complex security mechanisms.
3Adaptability or versatility
If protocol conversion is implemented between circuit-switched and packet-switched domains, then traditional users can access IMS services, but processing time and signaling overhead increase
Solution Approach 1:
The AGCF entity performs preliminary actions by pre-establishing session parameters and maintaining state information about active calls between traditional and IMS users. This allows protocol conversions to be executed more efficiently during call setup and teardown, reducing processing time compared to performing all conversions in real-time without pre-computed parameters.
Data Source
AI summary
Provided are an implementing method and a communication system for a traditional terminal user accessing an IMS domain. The method allocates an IMS domain user identification including a public identification and a private identification to a traditional terminal user on an AGF entity controlled by an AGCF entity, and establishes a mapping relation between the IMS domain user identification and the line identification of the user. When receiving a command or message for a certain user terminal sent from the AGF entity, the AGCF entity determines the IMS domain user identification of the user according to the mapping relation and sends a corresponding SIP message to the IMS domain.