Dual-SIM VoWiFi Registration Beyond Wi-Fi Coverage

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Solution Overview

Problem

In VoWiFi technology, terminals cannot perform voice over Wi-Fi (VoWiFi) services when outside of a Wi-Fi network environment.

Innovation Solution

A terminal with dual subscriber identity card modules accesses a first mobile network using a first subscriber identity card and transmits a VoWiFi registration message for a second subscriber identity card over the first mobile network, enabling VoWiFi service even without Wi-Fi.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If Wi-Fi is used as access network for VoWiFi service, then the terminal can perform voice and video calls within Wi-Fi coverage area, but the terminal cannot perform VoWiFi service when not in Wi-Fi network environment

Engineering Contradiction:

ImproveVoWiFi service availabilityVSAvoidnetwork access requirement

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The terminal is configured to perform VoWiFi registration and voice/video calls through multiple access networks including both Wi-Fi and mobile networks. The dual SIM card setup enables the terminal to universally access VoWiFi services regardless of whether Wi-Fi is available, by falling back to mobile network access when needed.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The mobile network acts as an intermediary access path when Wi-Fi is unavailable. The terminal uses the mobile network to transmit VoWiFi registration messages and establish voice/video calls, bridging the gap between Wi-Fi dependency and service continuity requirements.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the terminal uses dual subscriber identity card modules to access mobile network for VoWiFi registration, then VoWiFi service continuity is improved, but the device complexity increases

Engineering Contradiction:

Improveservice continuityVSAvoidsubscriber identity card configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The terminal is divided into multiple functional modules including a first subscriber identity card module for mobile network access and a second subscriber identity card module for VoWiFi registration. This segmentation allows independent configuration and operation of each module while achieving overall service reliability through their coordinated function.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12634862B2Service registration method, terminal, and network side device

Publication Date: 2026.05.19 VIVO MOBILE COMM CO LTD

AI summary

A service registration method, a terminal, and a network side device are provided. The terminal includes a first subscriber identity card module associated with a first subscriber identity card and a second subscriber identity card module associated with a second subscriber identity card. The method includes: accessing a first mobile network based on the first subscriber identity card; and transmitting a voice over wireless fidelity (VoWiFi) registration message of the second subscriber identity card based on the first mobile network.