Coordinated Dual SIM UEs for Missed Communication Handling

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Solution Overview

Problem

In wireless communication systems using dual SIM dual standby (DSDS) mode, network communications on the non-active SIM are often missed when the primary UE is engaged in active-mode communications on the active SIM, leading to missed calls, SMS, or other important notifications.

Innovation Solution

The implementation of coordinated UEs, where a secondary UE dynamically switches its active SIM based on the active SIM of a primary UE operating in DSDS mode, ensures that network communications on the non-active SIM are not missed. This is achieved by the primary UE checking the default SIM of the secondary UE and instructing it to switch to the non-active SIM when the primary UE activates its active SIM.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a primary UE operates in DSDS mode with one active SIM and one non-active SIM, then the primary UE can maintain service on the active SIM, but network communications on the non-active SIM are missed

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidmissed communications

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

A secondary UE acts as an intermediary device to monitor and receive network communications on the non-active SIM when the primary UE is engaged in active-mode communications. The secondary UE receives indications from the primary UE about which SIM is active and dynamically switches its own active SIM accordingly, serving as a mediator that prevents communication loss.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The solution extends the single-UE DSDS architecture to a multi-UE coordination system. By adding a secondary UE as another dimension to the system, the solution enables simultaneous monitoring of multiple SIM states across different devices, allowing network communications to be captured on whichever device currently has the appropriate SIM active.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If the primary UE monitors both SIMs simultaneously, then no communications are missed, but the device complexity and power consumption increase significantly

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The communication monitoring function is segmented across multiple UEs rather than requiring a single UE to handle all SIMs simultaneously. Each UE maintains its own active SIM and monitors network communications independently, dividing the overall monitoring task into manageable segments that can be executed with standard single-SIM capabilities.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The secondary UE is configured with both SIMs and can dynamically switch between them based on the primary UE's active SIM state. This multi-functionality allows a single device to serve multiple roles: acting as a backup for the non-active SIM, receiving notifications, and coordinating with the primary UE to ensure continuous coverage.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If the secondary UE dynamically switches SIM based on primary UE's active SIM, then continuous service availability is achieved, but the coordination complexity between UEs increases

Engineering Contradiction:

Improveservice availabilityVSAvoidcoordination complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The primary UE provides feedback to the secondary UE about its active SIM state through indication messages. The secondary UE uses this feedback to dynamically switch its own active SIM, creating a closed-loop coordination system where the secondary device adapts its behavior based on real-time information from the primary device.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The secondary UE is pre-configured with both SIMs before coordination begins. This preliminary setup ensures that when the primary UE needs the non-active SIM monitored, the secondary UE is already prepared and can immediately switch to the required SIM without delay, enabling rapid response to changing communication needs.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250048077A1Systems and methods for handling non-active subscriber identity module services in multiple subscriber identity module dual subscriber identity module dual standby mode

Publication Date: 2025.02.06 APPLE INC

AI summary

Systems and methods for providing non-active subscriber identity module (SIM) services leveraging multiple SIMs configured at multiple UEs are disclosed herein. A primary user equipment (UE), activating a first SIM of a dual SIM dual standby (DSDS) configuration used by the primary UE to perform active-mode network communications on the first SIM and sends, to a secondary UE, an indication to activate a second SIM of the DSDS configuration in response to the activating the first SIM of the DSDS configuration used by the primary UE. The secondary UE receives the indication to activate the second SIM of the first DSDS configuration used by the primary UE and activates the second SIM for use by the secondary UE in response to receiving the indication. Accordingly, the secondary UE may handle any network communications on the second SIM during the network communications on the first SIM at the primary UE.