MSIM Dual-Receive Handover Using Compatible Neighbor Frequency Filtering

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In multiple subscriber identity module (MSIM) dual receive (DR) scenarios, channel measurement procedures are hindered by RF channel-frequency incompatibilities, leading to delays in handover, loss of service, and increased modem power consumption due to unnecessary measurement attempts on incompatible frequencies.

Innovation Solution

A UE in DR mode identifies incompatible channel frequencies and performs channel measurements on a subset of neighbor frequencies that exclude these incompatibilities, ensuring minimum RF resources for active SIM operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If channel measurement procedures are performed on all neighbor channel frequencies in MSIM DR mode, then measurement completeness is improved, but handover delays increase due to futile measurements on incompatible frequencies

Engineering Contradiction:

Improvechannel measurement completenessVSAvoidhandover delay

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The system performs preliminary identification of incompatible channel frequencies before executing channel measurement procedures. By pre-determining which frequencies are incompatible with the current DR mode configuration, the system avoids performing futile measurements, thereby reducing handover delays while maintaining measurement completeness on compatible frequencies only.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system extracts and removes incompatible channel frequencies from the neighbor channel frequency list before performing measurements. This extraction process separates the useful measurement targets (compatible frequencies) from the harmful ones (incompatible frequencies), allowing measurements to proceed efficiently without waste on incompatible channels.

Inventive Principle:

Principle #2Taking out (Extraction)

2Measurement precision

If channel measurement procedures are performed on all neighbor channel frequencies, then measurement coverage is improved, but service loss increases due to measurement failures on incompatible frequencies

Engineering Contradiction:

Improvechannel measurement coverageVSAvoidservice continuity

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

Incompatible channel frequencies are extracted from the measurement list before execution. This prevents measurement failures on frequencies that cannot be measured in the current DR mode, thereby maintaining service continuity and reliability while preserving measurement coverage on all compatible frequencies.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system takes preliminary anti-action by identifying and excluding incompatible frequencies before measurements begin. This preemptive measure prevents potential measurement failures and service disruptions that would occur if measurements were attempted on incompatible frequencies, thereby protecting service continuity.

Inventive Principle:

Principle #9Preliminary anti-action

3Measurement precision

If channel measurement procedures are performed on all neighbor channel frequencies, then measurement thoroughness is improved, but modem power consumption increases due to unnecessary measurement attempts

Engineering Contradiction:

Improvechannel measurement thoroughnessVSAvoidmodem power consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

Incompatible channel frequencies are extracted from the measurement list, eliminating unnecessary measurement attempts. This reduces the total number of measurements the modem must perform, thereby lowering power consumption while maintaining thoroughness of measurements on compatible frequencies.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of performing measurements on all frequencies (excessive action), the system performs measurements only on the necessary subset of compatible frequencies (partial action). This optimized approach achieves sufficient measurement thoroughness for handover decisions while avoiding the energy waste of measuring incompatible frequencies.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12501330B2Handover timelines and power optimization for user equipment in multiple subscriber identity module dual receive scenarios

Publication Date: 2025.12.16 QUALCOMM INC

AI summary

Certain aspects of the present disclosure provide techniques for handover timelines and power optimization for user equipment (UE) in multiple subscriber identity module (MSIM) dual receive (DR) scenarios. An example method, performed by a UE, includes entering a DR mode in which a first subscriber identity module (SIM) is active in a first radio access technology (RAT) and a second SIM is idle in a second RAT, identifying one or more channel frequencies, of a neighbor channel frequency list, that are incompatible with the DR mode, and performing a channel measurement procedure with the second SIM, on a subset of the neighbor channel frequency list that does not include the one or more channel frequencies that are incompatible with the DR mode.