Multi-SIM DRX Handover Using Neighbor Cell Quality Thresholds

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Solution Overview

Problem

Multi-SIM user equipment (UE) experiences collisions in discontinuous reception (DRX) cycles, leading to inefficient handover processes due to overlapping DRX cycles and suboptimal quality of neighbor cells, resulting in failed handovers and increased power consumption.

Innovation Solution

The UE determines overlapping DRX cycles and assesses neighbor cell quality, triggering a handover only when the neighbor cell quality meets a threshold, skipping active times if the threshold is not met, and handling failed handovers by adjusting DRX cycles to optimize power usage and handover efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the UE triggers handover based on overlapping DRX cycles, then handover efficiency is improved, but power consumption increases due to unnecessary handovers to suboptimal cells

Engineering Contradiction:

Improvehandover efficiencyVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent introduces a quality threshold parameter for neighbor cells before triggering handover. The UE evaluates whether the neighbor cell quality satisfies the threshold condition before proceeding with handover, thereby changing the handover decision parameter from purely timing-based (DRX overlap) to quality-based, reducing unnecessary handovers and power consumption

Inventive Principle:

Principle #35Parameter changes

2Use of energy by moving object

If the UE skips active times to resolve DRX cycle overlap, then power consumption is reduced, but handover efficiency deteriorates due to delayed or missed handover opportunities

Engineering Contradiction:

Improvepower consumptionVSAvoidhandover efficiency

Core Design Contradiction:

Use of energy by moving objectVSProductivity

Solution Approach 1:

The patent dynamically adjusts DRX active times based on handover needs. When handover is triggered and quality threshold is met, the UE activates the target SIM during overlapping active times to perform handover procedures. This dynamic adjustment ensures handover efficiency is maintained while minimizing power consumption by only activating when necessary

Inventive Principle:

Principle #15Dynamics

3Reliability

If the UE monitors both SIMs continuously to prevent handover failures, then handover reliability is improved, but power consumption increases significantly

Engineering Contradiction:

Improvehandover reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic monitoring of neighbor cell quality during DRX active times rather than continuous monitoring. The UE periodically evaluates neighbor cell quality metrics (RSRP, RSRQ, SINR) during scheduled active periods, maintaining handover reliability through regular checks while significantly reducing power consumption compared to continuous monitoring

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS12604361B2Techniques for discontinuous reception collision resolution for multi-SIM user equipment

Publication Date: 2026.04.14 QUALCOMM INC

AI summary

In a device (120) with two SIMs (305a, 305b), the overlapping DRXs of the two connections is reduced by handovering one of the two SIM to a neighbor cell that satisfies a quality threshold.