Signaling Addressing Function for Roaming Service Access
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Solution Overview
Problem
The CAMEL phase I standard limits users roaming in other networks to accessing only a single IN service logic, requiring continuous redesign of existing service logic to integrate new services, which lacks flexibility and slows down the implementation of new services.
Innovation Solution
Interposing an addressing function in the signaling connection from the Service Switching Function of a visited network to update signaling messages with service addressing data, allowing invocation of multiple IN services in the home network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CAMEL phase I standard is used, then service logic can be separated from switching equipment, but users roaming in other networks can access only a single IN service logic
Solution Approach 1:
The patent introduces an addressing function as an intermediary component in the signaling connection between the visited network's Service Switching Function and the home network's Service Control Function. This addressing function intercepts and modifies signaling messages to include service addressing data, enabling multiple IN services to be accessed while roaming without requiring continuous redesign of service logic architecture.
Solution Approach 2:
The patent segments the service logic into multiple independent IN services that can be selectively invoked through the addressing function. Instead of integrating all services into a single service logic, the system allows separate service logics to be managed and routed independently, enabling flexible service selection for roaming users.
2Productivity
If existing service logic is continuously redesigned to integrate new services, then new services can be added, but implementation speed is slowed down
Solution Approach 1:
The patent implements a dynamic service selection mechanism where the addressing function can be configured to route different services to different Service Control Functions based on real-time needs. This allows new services to be added by configuring the addressing function without requiring redesign of existing service logic, thereby increasing implementation speed.
Solution Approach 2:
The patent performs preliminary configuration of service addressing data in the addressing function before services are needed. Service routing information is pre-configured, allowing new services to be activated quickly by simply updating the addressing function configuration rather than redesigning the entire service logic architecture.
3Ease of operation
If IN services are made available only from home network, then service reliability is maintained, but user convenience is reduced when roaming
Solution Approach 1:
The patent makes the home network's IN services universal by enabling them to be accessed from visited networks through the addressing function. The Service Control Function in the home network can serve both local and roaming users, providing multi-functionality that maintains service reliability while improving accessibility for roaming users.
Data Source
AI summary
A method of making network services available to a subscriber of a first mobile communications network when the subscriber roams in a second mobile communications network. The method includes: intercepting a signaling message issued by a service switching function of the second mobile communications network as a consequence to a service request by the subscriber; checking the intercepted signaling message; and based on the check, updating the intercepted signaling message so as to include service addressing data adapted to invoke a service in the first mobile communications network.