Terminal Beam Failure Detection Using BFD-RS Sets
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Solution Overview
Problem
In next-generation mobile communication systems, particularly in NR, controlling beam failure detection and recovery across multiple transmission/reception points (TRPs) and user equipment (UE) panels is challenging, leading to potential reductions in communication throughput and quality.
Innovation Solution
A terminal equipped with a receiving section for configuring beam failure detection reference signals (BFD-RS) and a control section to assess radio link quality using transmission configuration indication (TCI) states associated with control resource sets or physical downlink control channels, enabling effective beam failure detection and recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure detection is performed in multiple TRPs/UE panels, then communication reliability is improved, but control complexity increases
Solution Approach 1:
The patent segments beam failure detection into separate BFD-RS sets for different TRPs and UE panels. Each BFD-RS set is independently configured and monitored, allowing the terminal to perform beam failure detection for each TRP/panel separately. This segmentation enables independent control and monitoring of beam failure conditions across multiple TRPs and panels, improving reliability without overwhelming control complexity.
Solution Approach 2:
The patent dynamically associates BFD-RS sets with TCI states that change over time. The terminal monitors BFD-RS resources and dynamically switches between different BFD-RS sets based on TCI state changes, allowing adaptive beam failure detection that responds to changing channel conditions while maintaining manageable control complexity through standardized procedures.
2Measurement precision
If multiple BFD-RS sets are configured for different TRPs, then beam failure detection accuracy is improved, but configuration complexity increases
Solution Approach 1:
The patent divides beam failure detection resources into multiple BFD-RS sets, where each set is associated with specific TRPs and UE panels. This segmentation allows independent configuration and monitoring of BFD-RS for each TRP/panel combination, improving detection accuracy by enabling separate assessment of beam conditions for each TRP while maintaining organized configuration management.
Solution Approach 2:
The patent creates a universal framework where BFD-RS sets can be associated with different TCI states and serve multiple TRPs and panels through standardized procedures. The same BFD-RS set can be used across different configurations, and the association between BFD-RS sets and TCI states follows consistent rules, reducing configuration complexity through universality.
3Reliability
If beam failure detection is performed independently for each TRP, then communication quality is maintained, but processing overhead increases
Solution Approach 1:
The patent segments beam failure detection into independent BFD-RS sets for different TRPs and UE panels, allowing separate monitoring of beam conditions for each TRP. This segmentation enables the terminal to identify and respond to beam failures on a per-TRP basis, maintaining communication quality by quickly detecting and recovering from failures while optimizing processing by only actively monitoring configured BFD-RS sets.
Solution Approach 2:
The patent implements partial monitoring by configuring and monitoring only the necessary BFD-RS sets associated with active TCI states and configured TRPs/panels. The terminal performs beam failure detection selectively on configured BFD-RS resources rather than continuously monitoring all possible beams, reducing processing overhead while maintaining adequate detection capability for active connections.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives a configuration indicating one or two beam failure detection reference signal (BFD-RS) sets for a cell, and a control section that assesses radio link quality by using at least one of two transmission configuration indication (TCI) states associated with one control resource set or two physical downlink control channels (PDCCHs), and the one or two BFD-RS sets. According to one aspect of the present disclosure, it is possible to appropriately perform beam failure detection.