Beam failure evaluation

EP4758739A1Pending Publication Date: 2026-06-17TOYOTA JIDOSHA KK
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
TOYOTA JIDOSHA KK
Filing Date
2024-08-07
Publication Date
2026-06-17

AI Technical Summary

Technical Problem

Existing methods for beam failure detection in high-frequency communications, such as those using mmWave bands, are inadequate due to the lack of correlation between reference signal measurements and error rates, leading to undetected beam failures and potential radio link failures, especially in sidelink communications where central management is absent and both UEs are moving.

Method used

A method for evaluating beam failures by determining instances based on measurements of reference signals and acknowledgements, allowing for accurate detection and recovery from beam failures in a distributed manner without relying on continuous connectivity to central entities.

Benefits of technology

The proposed method effectively reduces the rate of undetected beam failures and false alarms by utilizing both reference signal measurements and HARQ feedback information, enabling swift and accurate beam failure detection and recovery in sidelink communications.

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Abstract

Disclosed are methods, apparatuses, and systems for beam failure evaluation in a communication. One method includes: determining, by a first node, a first beam failure instance based on one or more measurements performed on one or more reference signals received from a second node; determining, by the first node, a second beam failure instance based on a quantity of one or more acknowledgements issued by the first node, the one or more acknowledgements acknowledging receipt of one or more signals at the first node; and determining, by the first node, whether a beam failure occurred based on at least one of: the first beam failure instance or the second beam failure instance.
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