WTRU DRX Cycle Switching for Power-Efficient Beam Failure Detection

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Solution Overview

Problem

Existing wireless communication systems face challenges in implementing power-efficient measurements for high-frequency operations, particularly in managing beam failure detection and recovery within discontinuous reception (DRX) cycles.

Innovation Solution

A wireless transmit/receive unit (WTRU) determines measurement occasions based on scheduling activity and beam configuration, switching between different DRX cycles and configuring multiple sets of CSI-RS measurement opportunities to optimize power efficiency and beam management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If continuous beam failure detection measurements are performed at high frequencies, then beam management reliability is improved, but power consumption increases

Engineering Contradiction:

Improvebeam failure detection reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic beam failure detection measurements at specific measurement occasions rather than continuous monitoring. The WTRU performs CSI-RS measurements only at configured measurement occasions during active DRX periods, transforming continuous power-consuming operations into periodic actions that maintain detection reliability while significantly reducing average power consumption.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent dynamically adjusts measurement behavior based on DRX state and beam failure detection status. During active DRX periods, the WTRU performs measurements at configured occasions; during inactive periods, measurements are suspended. The system also dynamically switches between different DRX cycles (first and second DRX cycles) based on beam failure instance thresholds, optimizing the balance between reliability and power consumption in real-time.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If multiple sets of CSI-RS measurement opportunities are configured with different periodicities, then measurement flexibility is improved, but system complexity increases

Engineering Contradiction:

Improvemeasurement flexibilityVSAvoidsystem complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments CSI-RS measurement opportunities into multiple distinct sets, each with specific periodicities and measurement occasions. The network configures separate measurement opportunity sets that can be independently activated based on DRX state and beam failure conditions, allowing flexible adaptation without requiring a single complex measurement configuration.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes measurement parameters (periodicity, measurement occasions) based on system state. Different CSI-RS measurement opportunity sets are configured with different periodicities, and the WTRU selects which set to use based on current DRX state and beam failure detection status, enabling adaptive measurement flexibility through parameter changes rather than fixed complex configurations.

Inventive Principle:

Principle #35Parameter changes

3Loss of energy

If DRX cycles are switched based on beam failure instances, then power efficiency is improved, but control complexity increases

Engineering Contradiction:

Improveenergy efficiencyVSAvoidcontrol complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent implements feedback-based DRX cycle selection where the WTRU monitors beam failure instances and compares them against configured thresholds. Based on this feedback loop, the WTRU automatically switches between first and second DRX cycles, with the network providing threshold configurations and the WTRU reporting status, creating a controlled feedback mechanism that improves energy efficiency through automated adaptation.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent pre-configures multiple DRX cycles and beam failure instance thresholds before operation begins. The network provides the WTRU with configurations for both first and second DRX cycles along with threshold values, enabling the WTRU to make immediate switching decisions based on measured beam failure instances without requiring complex real-time calculations or negotiations.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12279140B2Power efficient measurements at higher frequencies

Publication Date: 2025.04.15 INTERDIGITAL PATENT HOLDINGS INC

AI summary

Power efficient measurements may be implemented for high frequency operations. A WTRU may determine measurement occasions, DRX cycle/configuration transitions, DRX pause/resume, DRX timer operation, and/or BFR based on scheduling activity, beam configuration, BFI detection, BFD, beam loss, etc. A WTRU may be configured with multiple DRX cycles and measurement opportunities (e.g., with different periodicities). The WTRU may perform (e.g., RS) measurement(s) with determined/configured timing (e.g., DRX on-durations) in a first DRX cycle based on condition(s). The WTRU may switch to a second DRX cycle and perform RS measurement(s) with determined/configured timing based on condition(s) (e.g., counted number of BFIs detected in first DRX cycle). The WTRU may switch from the second (e.g., short) DRX cycle to the first (e.g., long) DRX cycle or to non-DRX operation (e.g., DRX suspension or reset DRX inactivity timer) based on condition(s) (e.g., number of BFIs in first and/or second DRX cycle(s)).