Beam Failure Recovery for Repeated PDCCH Transmission

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing beam failure recovery mechanisms in wireless communications systems do not effectively support repeated transmission of physical downlink control channels (PDCCH), leading to inefficiencies in determining beam failure events and recovery processes, particularly in scenarios involving multiple transmission and reception points (TRPs).

Innovation Solution

A method and apparatus for beam failure recovery that involves determining beam failure events based on measurement results of a target PDCCH repeatedly transmitted at least K times, where K≥2, and reporting a recovery request to the network-side device, with configuration of reference signal resources for measurement and feedback mechanisms to facilitate beam recovery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a single PDCCH transmission is used for beam failure detection, then the detection process is simple, but the reliability of beam failure detection is insufficient in repeated transmission scenarios

Engineering Contradiction:

Improvebeam failure detection reliabilityVSAvoiddetection mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the beam failure detection process into multiple independent measurement instances corresponding to each repeated PDCCH transmission. Instead of treating repeated transmissions as a single event, the system divides them into K separate measurements, each evaluated independently against the beam failure threshold, thereby improving detection reliability while maintaining manageable complexity through modular evaluation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies partial action by requiring only a threshold number of failed measurements (e.g., N out of K) to trigger beam failure declaration, rather than requiring all K measurements to fail. This partial criterion balances reliability improvement with complexity control, avoiding the need to process and evaluate every single measurement result in full detail.

Inventive Principle:

Principle #16Partial or excessive action

2Adaptability or versatility

If beam failure detection is based on BFD RS spatially QCLed with CORESET, then the measurement configuration is straightforward, but it cannot accurately reflect beam quality when PDCCH repeated transmission is supported

Engineering Contradiction:

Improvemeasurement configuration adaptabilityVSAvoidbeam quality measurement precision

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent introduces dynamic adaptability by allowing the beam failure detection mechanism to adjust its behavior based on the transmission mode. When PDCCH repeated transmission is configured, the system dynamically switches from single-instance BFD RS measurement to multi-instance measurement across K repetitions, enabling the measurement configuration to adapt to different operational scenarios while maintaining precise beam quality assessment.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent creates a universal beam failure detection framework that can operate in both single-transmission and repeated-transmission modes. The same detection mechanism handles both cases by adjusting the number of measurement instances (K=1 for single transmission, K>1 for repeated transmission), providing multi-functional capability that improves measurement precision across different scenarios without requiring separate dedicated mechanisms.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If repeated PDCCH transmission is implemented, then the coverage and reliability of control channel are improved, but the existing beam failure recovery mechanism cannot handle it

Engineering Contradiction:

Improvecontrol channel reliabilityVSAvoidrecovery mechanism adaptability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent changes key parameters of the beam failure recovery mechanism to accommodate repeated PDCCH transmission. Specifically, it modifies the measurement evaluation parameter from single-instance to multi-instance (K repetitions), adjusts the failure threshold parameter to account for multiple measurements, and modifies the recovery triggering parameter to initiate recovery based on aggregated results from K measurements rather than a single measurement, thereby enabling the mechanism to handle repeated transmissions effectively.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12538149B2Beam failure recovery method and apparatus, and device

Publication Date: 2026.01.27 VIVO MOBILE COMM CO LTD

AI summary

A beam failure recovery method and apparatus, and a device. The method includes: determining, based on a measurement result of a target reference signal corresponding to a target physical downlink control channel PDCCH, whether a beam failure event occurs, where the target PDCCH includes at least a first PDCCH repeatedly transmitted for K times, and K≥2; and reporting a beam failure recovery request to a network-side device.