Multi-TRP Beam Failure Recovery With Candidate BFD RS Selection

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Solution Overview

Problem

Existing beam failure recovery techniques in 3GPP networks suffer from high latency due to inefficient configuration of beam failure detection reference signals (BFD RSs), particularly in multi-TRP scenarios, leading to suboptimal beam failure detection and recovery processes.

Innovation Solution

Implementing techniques to reduce latency in beam failure recovery by providing multiple lists of candidate BFD RSs per TRP through RRC signaling, associating these RSs with TCI states, and using priority rules or MAC/DCI signaling to select optimal BFD RSs, enabling efficient TRP-specific beam failure recovery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If traditional beam failure recovery techniques are used in multi-TRP mode, then the system can maintain basic connectivity, but the reconfiguration latency is high and TRP-specific BFR is not effectively supported

Engineering Contradiction:

Improvereconfiguration latencyVSAvoidTRP-specific BFR support

Core Design Contradiction:

Loss of timeVSAdaptability or versatility

Solution Approach 1:

The patent segments the beam failure recovery process by introducing separate BFD RS lists for each TRP (first BFD RS list for first TRP, second BFD RS list for second TRP). This allows independent monitoring and recovery for each TRP, enabling TRP-specific BFR and reducing overall reconfiguration latency by parallelizing the recovery process across multiple TRPs.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies preliminary action by pre-configuring multiple candidate BFD RSs in separate lists for each TRP before beam failure occurs. When failure is detected, the UE can immediately select from pre-prepared candidate beams without waiting for network reconfiguration, significantly reducing recovery latency.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If multiple lists of candidate BFD RSs are provided per TRP, then TRP-specific BFR and latency reduction are achieved, but the configuration complexity and signaling overhead increase

Engineering Contradiction:

Improvebeam failure recovery speedVSAvoidconfiguration complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies local quality by providing different BFD RS lists tailored to each specific TRP's characteristics and beam configurations. Each TRP has its own optimized candidate beam list, allowing the system to adapt the complexity locally to each TRP's needs rather than using a uniform configuration across all TRPs.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces dynamic selection mechanisms where the UE can dynamically choose which BFD RS list to use based on current beam conditions and TRP status. The network can also dynamically update and reconfigure the BFD RS lists adaptively, allowing the system to adjust complexity in real-time based on operational requirements.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12634977B2Latency reduction for beam failure recovery

Publication Date: 2026.05.19 APPLE INC

AI summary

The present application relates to devices and components including apparatus, systems, and methods for latency reduction for beam failure recovery (BFR), with respect to transmit-receive point (TRP)-specific BFR.