Dual-SIM UE Single Stack Mode Signaling for Power Saving

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Solution Overview

Problem

Dual-SIM devices experience high power consumption due to simultaneous operation of multiple SIM cards, leading to rapid battery drain and degraded system performance, with existing methods failing to effectively address inter-network communication and resource optimization.

Innovation Solution

A signaling method enabling Single Stack Mode (SSM) through coordinated communication between different network nodes (PLMN-1 and PLMN-2) to manage power consumption by allowing only one SIM to process both cards, using protocol stacks 1 and 2, and optimizing DRX parameters based on UE and network KPIs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If Dual-SIM devices operate both SIM cards simultaneously with full protocol stacks, then service coverage and communication reliability are improved, but power consumption increases rapidly

Engineering Contradiction:

Improveservice coverageVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent merges the protocol stack resources by allowing one protocol stack to handle both SIM cards. Specifically, when SSM is activated, the first protocol stack processes signaling for both the first SIM card (served by first network) and the second SIM card (served by second network), eliminating the need for a separate second protocol stack and reducing power consumption while maintaining service coverage

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent implements dynamic switching between dual protocol stack mode and single protocol stack mode based on service conditions. The device can activate SSM when power saving is needed and deactivate it when full functionality is required, allowing adaptive adjustment of resource allocation between the two SIM cards

Inventive Principle:

Principle #15Dynamics

2Reliability

If Dual-SIM devices use separate protocol stacks for each SIM card, then communication reliability is improved, but device complexity and resource utilization increase

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidprotocol stack resources

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the protocol stack resources by allowing one protocol stack to serve both SIM cards. The first protocol stack is configured to handle signaling messages for both the first network (serving first SIM) and the second network (serving second SIM), reducing the number of protocol stacks from two to one and simplifying device complexity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The first protocol stack is designed with multi-functionality to handle different types of signaling messages from different networks. It can process registration requests, service requests, and other control plane messages for both SIM cards, making a single protocol stack universal for both communication tasks

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Use of energy by moving object

If Dual-SIM devices activate Single Stack Mode to reduce power consumption, then battery life is extended, but inter-network coordination complexity increases

Engineering Contradiction:

Improvebattery lifeVSAvoidnetwork coordination

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent introduces the network side as an intermediary to manage the complexity of inter-network coordination. The first network (served by first network node) acts as a mediator that receives service requests from the second network, performs service matching, and coordinates the activation and deactivation of SSM mode, thereby offloading coordination complexity from the device to the network

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent implements feedback mechanisms where the device reports service requirements and power consumption status to the network, and the network responds with appropriate SSM activation decisions. The first network node receives service requests, determines whether to activate SSM based on service matching, and notifies the device accordingly, creating a closed-loop feedback system for coordinated power saving

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250330796A1Method performed by a dual-SIM UE, a second network node (PLMN-1) and a third network node (PLMN-2), operating in a wireless communication network

Publication Date: 2025.10.23 SAMSUNG ELECTRONICSA AMAZONIA LTDA

AI summary

The present invention describes a method for adjusting dynamically power saving mechanisms in Dual-SIM devices, considering different 5G and beyond networks inter-communication. Specifically, the present invention details the signaling and methodology for inter-network operation regarding the use of the proposed feature. Particularly, the present invention relates to a signaling method for enabling single stack mode (SSM) operation for power saving in Dual-SIM devices.