Beam Failure Recovery in Shared Spectrum

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Solution Overview

Problem

Current wireless communication networks face challenges in efficiently managing beam failure detection and recovery, especially in scenarios with high mobility and varying environmental conditions.

Innovation Solution

The implementation of a beam failure detection and recovery procedure using listen before talk (LBT) techniques, which involves periodic reference signal transmissions and dynamic adjustment of beam configurations based on real-time channel conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If beam failure detection and recovery procedures are implemented in shared radio spectrum, then reliability of beam management is improved, but latency increases due to listen before talk requirements

Engineering Contradiction:

Improvebeam management reliabilityVSAvoidrecovery latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements preliminary action by performing listen before talk (LBT) procedures in advance before beam failure recovery transmissions. The UE conducts LBT on alternative beams before attempting recovery, ensuring channel availability is confirmed beforehand. This preliminary channel assessment prevents failed recovery attempts and reduces overall recovery time despite the additional initial listening step.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies dynamics by enabling the UE to dynamically switch between multiple alternative beams during the recovery process. The UE can adaptively select from N alternative beams based on real-time channel conditions and LBT outcomes. This dynamic beam selection allows the system to respond flexibly to changing radio conditions, improving reliability while managing latency through intelligent beam switching.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If multiple alternative beams are configured for recovery, then adaptability of beam selection is improved, but device complexity increases

Engineering Contradiction:

Improvebeam selection adaptabilityVSAvoidbeam management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements parameter changes by varying the number of alternative beams (N) based on service requirements and channel conditions. The network can configure different values of N dynamically, allowing the system to adapt beam selection adaptability to specific scenarios. When low complexity is needed, N can be reduced; when high adaptability is required, N can be increased, providing flexible parameter tuning.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies partial action by configuring a limited set of N alternative beams rather than evaluating all possible beams. This selective approach provides sufficient adaptability for most scenarios while avoiding the excessive complexity of comprehensive beam evaluation. The system performs LBT and recovery attempts on a subset of pre-configured alternative beams, balancing adaptability with manageable device complexity.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12308933B2Beam failure recovery procedures with shared radio spectrum

Publication Date: 2025.05.20 OFINNO LLC

AI summary

A method may include determining, by a wireless device, a periodic beam failure detection (BFD) reference signal (RS) is not received due to a failure of a listen before talk (LBT) procedure. The method may include transmitting, in response to the determining, a message for a BFD procedure based on receiving an aperiodic BFD RS quasi collocated with the periodic BFD RS.