NR CSI-RS Beam Failure Detection Evaluation Period Extension
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Solution Overview
Problem
The traditional evaluation time period for beam failure detection (BFD) in NR CSI-RS based BFD/RLM in FR2 is not effective in multi-beam environments, as it does not adapt to scenarios where CSI-RS is configured without beam information or with repetition ON, leading to potential beam failure misidentification.
Innovation Solution
The evaluation period for BFD is extended by an N factor, which is determined based on RRC configuration, including scenarios where CSI-RS is configured without beam information or with repetition ON, ensuring accurate beam failure detection by adjusting the evaluation period dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the traditional evaluation time period is used for BFD in multi-beam environments, then the detection process is simple and fast, but the detection accuracy deteriorates due to beam failure misidentification
Solution Approach 1:
The evaluation period is made dynamic by introducing an N factor that multiplies the base evaluation period. The N factor is determined based on whether beam information is configured and the repetition setting, allowing the evaluation period to adapt to different operational scenarios rather than using a fixed traditional period
Solution Approach 2:
The patent changes the parameter of evaluation period by introducing a multiplicative N factor. When beam information is not configured or repetition is enabled, N > 1, which extends the evaluation period. This parameter adjustment directly addresses the detection accuracy issue in multi-beam environments while maintaining a systematic approach to configuration
2Reliability
If the evaluation period is extended by N factor to improve detection accuracy, then false negatives are reduced, but the detection time increases
Solution Approach 1:
The evaluation period extension is applied locally and selectively based on specific conditions. The N factor is only greater than 1 when beam information is not configured or repetition is enabled. In other scenarios, the traditional evaluation period is used, thus avoiding unnecessary time extension when it is not needed for accurate detection
Solution Approach 2:
The patent applies partial action by extending the evaluation period only in specific scenarios where beam information is missing or repetition is configured. This avoids the excessive time loss that would occur if the evaluation period were extended in all cases, while still providing sufficient evaluation time when necessary for accurate beam failure detection
Data Source
AI summary
Apparatus and methods are provided for NR CSI-RS based BFD/RLM in FR2. In one novel aspect, BFD in FR2, the evaluation period is extended by the N factor if the CSI-RS for BFD is in a resource set configured with repetition ON or the BFD is performed on CSI-RS#1 without beam information or, where the CSI-RS#1 is configured without beam information if CSI-RS for BFD is not QCL-TypeD with SSB for L1-RSRP beam reporting, nor the CSI-RS for BFD is not QCL-TypeD with CSI-RS for L1-RSRP beam reporting. In one embodiment, the N factor equals to 1 only when at least one predefined RX beam information is included in the RRC configuration. In another embodiment, the predefined RX beam information for BFD is Type-D QCL information for a synchronization signal block (SSB) configured in its TCI state or the CSI-RS#1 is configured with repetition ON.