Terminal Beam Failure Detection Reference Signal Determination
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Solution Overview
Problem
In next-generation mobile communication systems, particularly for New Radio (NR), the method for determining a Beam Failure Detection (BFD) reference signal is indefinite, leading to potential throughput reduction and communication quality degradation unless appropriately determined.
Innovation Solution
A terminal is equipped with a receiving section to process medium access control-control elements (MAC CE) for activating transmission configuration indication (TCI) states, and a control section that determines reference signals for BFD in cases where the BFD reference signal is not configured, utilizing these signals for beam failure detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the BFD reference signal is not configured, then the terminal structure is simpler, but the beam failure detection accuracy deteriorates leading to throughput reduction and communication quality degradation
Solution Approach 1:
The terminal uses existing TCI states configured for downlink communication to automatically determine BFD reference signals without requiring separate BFD RS configuration. The terminal serves its own beam failure detection needs by leveraging already-configured downlink reference signals, eliminating the need for additional dedicated BFD RS configuration while maintaining detection accuracy.
Solution Approach 2:
Downlink reference signals (TCI states) serve dual purposes: both for normal downlink communication and for beam failure detection. By making the reference signal universal, the system eliminates the need for separate dedicated BFD RS, reducing configuration complexity while maintaining detection reliability through the same signal.
2Reliability
If a dedicated BFD reference signal is configured, then the beam failure detection accuracy is improved, but the device complexity and configuration burden increase
Solution Approach 1:
The terminal autonomously determines BFD reference signals by selecting from existing TCI states without requiring network-side dedicated configuration. This self-service approach eliminates configuration burden while maintaining detection accuracy through automated selection of appropriate reference signals.
Solution Approach 2:
The system changes the parameter of reference signal selection from network-configured dedicated BFD RS to terminal-autonomous selection from TCI states. This parameter change allows the terminal to adaptively choose appropriate reference signals based on current communication conditions, reducing configuration complexity while maintaining detection reliability.
3Ease of manufacture
If the terminal uses existing TCI states for BFD, then the configuration simplicity is improved, but the detection precision may deteriorate if TCI states are not appropriately selected
Solution Approach 1:
The terminal uses feedback from downlink communication quality assessment to determine appropriate TCI states for BFD. By monitoring the actual communication conditions and using this feedback, the terminal can selectively determine which TCI states to use as BFD reference signals, ensuring detection precision while maintaining configuration simplicity.
Solution Approach 2:
The system dynamically adapts the BFD reference signal selection based on current communication conditions rather than using a fixed predetermined mapping. The terminal can flexibly choose from available TCI states according to actual channel conditions, maintaining detection precision while keeping the configuration simple.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives a medium access control-control element (MAC CE) to activate two transmission configuration indication (TCI) states for one codepoint of a field in downlink control information, and a control section that determines one or more reference signals in a case where a reference signal for beam failure detection (BFD) is not configured, the one or more reference signals being used for BFD. According to one aspect of the present disclosure, it is possible to appropriately determine a BFD RS.