Relay UE Beam Failure Notification in Multi-Path Relay Links
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing beam failure in multi-path relays, leading to resource wastage and inefficiencies in reporting mechanisms.
Innovation Solution
A method and device for a relay user equipment (UE) to establish a PC5 RRC connection with a remote UE, transmit signals to a base station, and detect beam failure, reporting this failure to the remote UE through sidelink communication, thereby triggering appropriate actions such as RLC deactivation or reselection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relay UE continuously monitors and reports beam failure status, then the reliability of beam failure detection is improved, but the energy consumption and signaling overhead increase
Solution Approach 1:
The relay UE performs preliminary actions by configuring the remote UE with beam failure detection parameters and notification mechanisms in advance. The relay UE pre-establishes the monitoring framework and notification procedures, so when beam failure occurs, the system can respond immediately without needing continuous active monitoring and reporting throughout the entire communication session.
Solution Approach 2:
The patent implements a feedback mechanism where the relay UE notifies the remote UE about beam failure status through predefined notification messages. This feedback approach allows the system to maintain reliability by informing the remote UE of beam failure conditions, while avoiding continuous energy-consuming monitoring by using event-triggered notifications rather than continuous status reporting.
2Measurement precision
If the relay UE implements comprehensive beam failure reporting mechanisms, then the measurement precision of beam failure detection is improved, but the device complexity increases
Solution Approach 1:
The patent extracts the beam failure detection and reporting functionality from the relay UE's core processing tasks. By separating the monitoring function (performed by the relay UE) from the notification function (performed by the remote UE upon receiving notifications), the system achieves precise beam failure detection without requiring the relay UE to handle all processing complexity alone. The remote UE independently manages its own actions based on notifications.
Solution Approach 2:
The notification message structure is designed to be universal, handling multiple beam failure scenarios through a single standardized mechanism. The relay UE uses a unified notification approach that can convey different types of beam failure information, reducing the need for multiple specialized detection and reporting mechanisms and thereby simplifying the overall system complexity while maintaining measurement precision.
3Reliability
If the remote UE continuously monitors beam status through the relay UE, then the reliability of connection maintenance is improved, but the loss of time in response to beam failure increases
Solution Approach 1:
The relay UE performs preliminary configuration of the notification mechanism with the remote UE before beam failure occurs. By pre-establishing the notification framework and parameters, the system eliminates the need for the remote UE to continuously monitor beam status through the relay UE, thereby maintaining connection reliability while reducing response time to beam failure events.
Solution Approach 2:
The relay UE acts as an intermediary that monitors beam failure conditions on the Uu link and translates this information into notification messages for the remote UE. This intermediary role allows the remote UE to maintain connection reliability through proper notification mechanisms without needing to directly monitor beam status, thereby avoiding the time loss associated with continuous monitoring while still achieving timely response to beam failure.
Data Source
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AI summary
An operation method of a relay user equipment (UE) related to beam failure in a multi-path relay in a wireless communication system includes establishing a PC5 radio resource control (RRC) connection with a remote UE by the relay UE, transmitting a signal transmitted by the remote UE to a base station (BS) by the relay UE, and detecting beam failure in a Uu link with the BS by the relay UE, wherein the relay UE transmits information indicating that the beam failure is detected, to the remote UE.