API-Driven IMS Routing for Dual Registration Subscribers

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Solution Overview

Problem

Conventional mobile network operators are unaware of secondary IMS registrations for RCS services, leading to session setup failures and missed messages when subscribers use external RCS messaging hubs, as they incorrectly route RCS traffic as in-network traffic.

Innovation Solution

Implementing an API-driven system that detects and modifies service order codes to differentiate between single and dual registration subscribers, routing single registration traffic internally and dual registration traffic externally to ensure correct routing of RCS messaging traffic.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the mobile network operator routes all RCS traffic as in-network traffic, then the routing process is simple, but session setup failures occur and messages are missed when subscribers use external RCS messaging hubs

Engineering Contradiction:

Improverouting process simplicityVSAvoidsession setup success rate

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system changes the routing parameter based on the service order code. When the service order code indicates dual registration, the system switches from internal routing to external routing, thereby adapting the routing behavior to the correct network path and avoiding session setup failures

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system uses the service order code as feedback information to determine the appropriate routing path. By detecting the service order code, the system receives information about the subscriber's registration status and adjusts the routing accordingly, ensuring reliable message delivery

Inventive Principle:

Principle #23Feedback

2Reliability

If the mobile network operator implements service order code detection and modification, then accurate routing of RCS traffic is achieved, but the system complexity increases

Engineering Contradiction:

ImproveRCS traffic routing accuracyVSAvoidsystem architecture complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The service order code acts as an intermediary element that carries routing information between the external RCS messaging hub and the mobile network operator's core device. This intermediary enables accurate routing decisions without requiring complex direct communication protocols, simplifying the overall system architecture while maintaining reliability

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20250024398A1API driven subscriber IMS registration status changes and IMS routing steering

Publication Date: 2025.01.16 AT&T INTELLECTUAL PROPERTY I L P

AI summary

A method for discerning single registration subscribers and dual registration subscribers, and routes single registration traffic as internal and routes dual registration traffic as external.