Virtual Line Registration That Preserves Native SIM Service

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Solution Overview

Problem

When a user equipment (UE) attempts to register a virtual line along with a native SIM line, failures in the virtual line registration can cause the native SIM line to also fail, leading to a loss of communication capabilities, including emergency call functionality.

Innovation Solution

The core network employs a proxy-call session control function (P-CSCF) to manage the registration process, allowing the UE to deregister the native SIM line if virtual line registration fails, ensuring the native SIM line remains operational by sending a single message indicating successful registration, even if the virtual line registration is unsuccessful.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the UE attempts to register both virtual line and native SIM line simultaneously, then the virtual line registration can be processed, but the native SIM line registration may fail causing loss of communication capabilities

Engineering Contradiction:

Improvevirtual line registration capabilityVSAvoidnative SIM line operational status

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent segments the registration process into separate operations: virtual line registration and native SIM line registration are handled as independent registration requests rather than a combined operation. This allows the native SIM line registration to proceed independently without being affected by virtual line registration failures.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent performs preliminary action by ensuring the native SIM line registration is completed and confirmed before attempting virtual line registration. The system waits for successful native SIM line registration acknowledgment before proceeding with virtual line registration, preventing the scenario where virtual line registration failures could affect native SIM line functionality.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If the system processes virtual line registration requests, then virtual line functionality is enabled, but communication capabilities including emergency calls may be lost

Engineering Contradiction:

Improvevirtual line functionalityVSAvoidcommunication capability availability

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent implements beforehand cushioning by maintaining a backup mechanism where the native SIM line registration status is continuously monitored and preserved. If virtual line registration fails, the system ensures the native SIM line registration remains intact and functional, providing a cushion against total communication capability loss.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The patent uses the core network's authentication and authorization mechanisms as an intermediary layer that independently validates both virtual line and native SIM line registrations. This intermediary validation process ensures that failures in one registration type do not propagate to affect the other, maintaining communication capabilities through the native SIM line.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If the UE sends combined registration request for SIM and virtual line, then registration process is streamlined, but failure in virtual line registration causes native SIM line registration to fail

Engineering Contradiction:

Improveregistration process efficiencyVSAvoidregistration success rate

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent divides the combined registration request into separate registration requests for native SIM line and virtual line. This segmentation allows each registration type to be processed independently, so that a failure in virtual line registration does not cause native SIM line registration to fail, thereby improving overall registration reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements preliminary action by first processing and confirming native SIM line registration before attempting virtual line registration. This sequential approach with preliminary validation ensures that the more critical native SIM line registration is secured first, preventing subsequent virtual line registration failures from compromising overall registration success.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12513508B2Virtual line registration system

Publication Date: 2025.12.30 T MOBILE US INC

AI summary

An improved core network that allows a UE to still initiate and/or receive communications via a native SIM line even if the registration of a virtual line fails is described herein. For example, the UE may include embedded virtual line settings that, when enabled, cause the UE to transmit a virtual line registration request to the core network. The core network can determine whether the UE is authorized to register a virtual line. If the UE is authorized, the core network can register a native SIM line, register the virtual line, and transmit a single message to the UE indicating that the native SIM and virtual lines are registered. If the UE is not authorized, the core network still registers the native SIM line and transmits a single message to the UE indicating that the native SIM line is registered.