Beam Failure Detection Active-Time Extension Under DRX

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Solution Overview

Problem

Existing wireless communication systems face challenges in effectively extending the active time for beam failure detection (BFD) during discontinuous reception (DRX), which can lead to suboptimal performance and connectivity issues.

Innovation Solution

The method involves receiving and transmitting beam failure detection reference signals (BFD-RSs) during an active time extension outside the conventional DRX period, allowing for enhanced monitoring and reporting to improve beam failure detection accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the active time for beam failure detection is extended outside DRX active time, then beam failure detection accuracy is improved, but power consumption increases

Engineering Contradiction:

Improvebeam failure detection accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The system performs preliminary beam failure detection actions by monitoring BFD-RS during the active time extension period before the DRX inactive time begins. This allows the UE to proactively detect beam failures early and initiate recovery procedures before entering low-power state, improving detection accuracy while controlling power consumption through targeted monitoring rather than continuous operation

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements partial action by extending the active time only for the specific purpose of beam failure detection rather than maintaining full active operation. The UE monitors BFD-RS during this extended period and then transitions to DRX inactive time, performing detection actions partially (only when needed) rather than continuously, thus balancing detection accuracy with power consumption

Inventive Principle:

Principle #16Partial or excessive action

2Reliability

If beam failure detection is performed during DRX inactive time, then detection coverage is improved, but processing complexity increases

Engineering Contradiction:

Improvedetection coverageVSAvoidprocessing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the detection process into two distinct phases: (1) monitoring phase during active time extension where BFD-RS is received and initial assessment is performed, and (2) evaluation phase during DRX inactive time where final beam failure determination is made. This segmentation allows the system to spread processing complexity across different time periods, improving detection coverage without overwhelming the processor at any single moment

Inventive Principle:

Principle #1Segmentation

3Loss of time

If the active time is extended for BFD monitoring, then latency is reduced, but time resources are consumed

Engineering Contradiction:

ImprovelatencyVSAvoidactive time duration

Core Design Contradiction:

Loss of timeVSDuration of action of moving object

Solution Approach 1:

The system performs preliminary beam failure detection during the active time extension before the UE enters DRX inactive time. By detecting beam failures early during this extended active period, the system reduces the latency associated with waiting until the next DRX cycle to detect failures, while the extension duration is carefully controlled to minimize time resource consumption

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12621856B2Active time extension for beam failure detection

Publication Date: 2026.05.05 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive one or more beam failure detection (BFD) reference signals (RSs) during an active time under discontinuous reception (DRX). The UE may monitor BFD-RSs in an active time extension that is outside the active time for DRX. The UE may receive one or more BFD-RSs during the active time extension. Numerous other aspects are described.