UE Reference Signal Detection and Gating

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Solution Overview

Problem

In wireless communication systems, particularly in unlicensed spectra, the detection of reference signals and the subsequent processing can be inaccurate due to unsuccessful listen-before-talk (LBT) procedures, leading to holes in the frequency domain and incorrect channel state feedback or frequency/time tracking loops.

Innovation Solution

A method and apparatus for user equipment (UE) to detect the presence of reference signals in a channel at expected time instances and selectively gate processing based on the detection, preventing inaccurate processing when reference signals are not present or have holes in the frequency domain.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE continuously processes reference signals without detection, then the processing speed is maintained, but the reliability deteriorates due to incorrect processing when reference signals are not present

Engineering Contradiction:

Improvereference signal processing reliabilityVSAvoidprocessing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The UE performs preliminary detection of the reference signal before processing it. This preliminary action determines whether the reference signal is actually present in the channel, allowing the UE to gate processing accordingly and avoid incorrect processing when the reference signal is absent.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The detection result feeds back into the processing decision-making process. Based on whether the reference signal is detected as present or absent, the UE gates the processing operation, creating a feedback-controlled system that adapts its behavior based on actual signal conditions.

Inventive Principle:

Principle #23Feedback

2Reliability

If the UE gates processing based on reference signal detection, then the reliability improves, but the productivity decreases due to interrupted processing

Engineering Contradiction:

Improvechannel state feedback accuracyVSAvoidreference signal processing throughput

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The processing system becomes dynamic rather than static. The gating mechanism allows the processing to be activated or deactivated based on real-time detection conditions, enabling the system to adapt its operational state to match actual reference signal availability while maintaining accuracy.

Inventive Principle:

Principle #15Dynamics

3Measurement precision

If the UE processes reference signals without detection, then the processing speed is maintained, but the measurement precision deteriorates due to holes in the frequency domain

Engineering Contradiction:

Improvefrequency domain measurement accuracyVSAvoidprocessing speed

Core Design Contradiction:

Measurement precisionVSSpeed

Solution Approach 1:

The UE performs preliminary detection to determine reference signal presence before processing. This ensures that processing only occurs when the reference signal is actually present, preventing measurement precision deterioration from processing holes in the frequency domain while maintaining processing speed when conditions are favorable.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12323948B2Detection of reference signals and gating of reference signal processing

Publication Date: 2025.06.03 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may detect whether a reference signal is present in a channel at a time instance at which the reference signal is expected. The UE may selectively gate processing of the reference signal based on detecting whether the reference signal is present in the channel. Numerous other aspects are described.