UE Beam Failure Detection Using CORESET-Based RS Selection
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Solution Overview
Problem
In future radio communication systems, detecting beam failure and selecting appropriate resources for beam failure recovery is challenging when the UE is not configured with specific resources, leading to reduced communication throughput.
Innovation Solution
A terminal selects up to a given number of control resource sets (CORESETs) for determining reference signal indices based on a specific rule when not configured using higher layer signaling, and evaluates radio link quality based on these indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the UE uses up to two reference signal indices corresponding to TCI state of CORESET for beam failure detection when not configured with specific resources, then the device complexity is reduced, but the reliability of beam failure detection deteriorates when more than two CORESETs are configured
Solution Approach 1:
The patent changes the selection parameter from arbitrary or implementation-dependent to based on monitoring order and detection timing. When more than two CORESETs are configured, the UE selects reference signal indices based on the order of monitoring PDCCH and the timing of detection, ensuring consistent and reliable beam failure detection across different configurations while maintaining the simplicity of using up to two indices.
2Adaptability or versatility
If the UE selects reference signal indices from more than two CORESETs without a clear selection rule, then the adaptability is increased, but the measurement precision of beam failure detection deteriorates
Solution Approach 1:
The patent introduces specific selection parameters based on PDCCH monitoring order and detection timing to determine which reference signal indices to use from the available CORESETs. This ensures that even when adapting to different numbers of CORESETs, the UE consistently selects the most relevant indices for accurate beam failure detection.
Solution Approach 2:
The patent establishes predetermined selection rules based on monitoring order and detection timing before the actual beam failure detection occurs. This preliminary determination of which reference signal indices to use ensures that the UE can accurately and consistently select from multiple CORESETs without requiring complex real-time decisions.
3Ease of operation
If no specific rule is defined for selecting reference signal indices from multiple CORESETs, then the ease of operation is improved, but the loss of information about beam quality increases
Solution Approach 1:
The patent uses monitoring order and detection timing as selection parameters to determine which reference signal indices to use. This approach maintains implementation simplicity by providing clear, deterministic rules while ensuring that the selected indices contain the most relevant beam quality information for accurate failure detection.
Data Source
AI summary
A beam failure is appropriately detected. A terminal according to an aspect of the present disclosure includes a control section that, when a set of a reference signal (RS) index corresponding to a resource for beam failure detection (BFD) is not configured using higher layer signaling and a specific parameter is configured, selects up to a given number of control resource sets (CORESETs) for determining the RS index to be included in the set in accordance with a specific rule, and a receiving section that evaluates radio link quality, based on an RS corresponding to the RS index.