Dual SIM Network Return via Secondary Modem Search

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Solution Overview

Problem

Terminal devices often fail to return to a high-standard network after falling back from it to a low-standard network, affecting user experience, especially when the primary card is in data service connected mode and cannot use a background search mechanism to find a high-standard network.

Innovation Solution

The method involves detecting when a first SIM card falls back to a second-standard network, obtaining the registration status of a second SIM card, determining the target high-standard network based on this status, and registering the first SIM card with that network, using the second SIM card's modem to search for the target network if necessary, to facilitate the return to the high-standard network.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the primary SIM card falls back from high-standard network to low-standard network while in data service connected mode, then data service continuity is maintained, but the ability to return to high-standard network is lost

Engineering Contradiction:

Improvedata service continuityVSAvoidnetwork switching capability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent segments the network search function by assigning it to the secondary SIM card's modem while keeping the primary SIM card in data service mode. This allows the search function to operate independently without interrupting the primary data service, resolving the contradiction between maintaining data service continuity and enabling network switching capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The secondary SIM card acts as an intermediary to perform the network search function. By using the secondary SIM card's modem to search for high-standard networks while the primary SIM card maintains data service, the system resolves the conflict between service continuity and network adaptability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If the terminal device uses background search mechanism for the primary SIM card, then network search capability is maintained, but data service is interrupted

Engineering Contradiction:

Improvenetwork search capabilityVSAvoiddata service interruption

Core Design Contradiction:

Adaptability or versatilityVSDuration of action of moving object

Solution Approach 1:

The patent divides the search function to the secondary SIM card, allowing network search to occur in parallel with primary SIM data service without interruption. This segmentation eliminates the need to interrupt data service for background searches.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent combines the network search function with the secondary SIM card's operations, merging two functions (data service and network search) that were previously mutually exclusive into a unified dual-SIM architecture where both can operate simultaneously.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If the terminal device switches SIM cards for network search, then network return capability is improved, but system complexity increases

Engineering Contradiction:

Improvenetwork return capabilityVSAvoiddual SIM dual standby management

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The secondary SIM card is given multi-functionality, serving both as a standby communication card and as the agent for network search operations. This universal use of the secondary SIM simplifies the overall system architecture compared to implementing separate search mechanisms.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11589280B2Method for returning from low-standard network to high-standard network and communications apparatus

Publication Date: 2023.02.21 HUAWEI TECH CO LTD

AI summary

This application provides a method for returning from a low-standard network to a high-standard network, to resolve a problem that a primary card of a terminal device in dual SIM dual standby single pass mode cannot return to the high-standard network after falling back from the high-standard network to the low-standard network during a data service. The method includes: detecting that a first subscriber identification module SIM card of the terminal device falls back from a first-standard network to a second-standard network; obtaining a registration status of a second SIM card, where the registration status includes an operator of the second SIM card and a network on which the second SIM card camps, and the first SIM card and the second SIM card enable the terminal device to work in the dual SIM dual standby single pass mode; obtaining a target standard network based on the registration status of the second SIM card; and registering the first SIM card with the target standard network.