Beam Failure Reporting in Multi-TRP 5G NR Systems
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Solution Overview
Problem
In multi-transmission/reception point (TRP) operations for 3GPP New Radio (NR) mobile communications, user equipment (UE) fails to detect downlink control information (DCI) when control beams of one TRP fail, leading to missed beam failure detection and unnecessary power consumption by turning on antenna panels for disconnected TRPs.
Innovation Solution
The UE is equipped with a radio frequency (RF) signal processing device that receives candidate-beam reference-signal lists associated with different beam-failure-detection reference-signal sets, allowing it to perform measurements and report beam failures, transmit scheduling requests, and determine the use of physical uplink control and shared channels for beam failure recovery, thereby identifying new candidate beams and managing resource allocation efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors all control beams from all TRPs to detect beam failures, then the beam failure detection reliability is improved, but the power consumption increases due to turning on antenna panels for disconnected TRPs
Solution Approach 1:
The patent segments the beam failure detection process by introducing separate BFD-RS sets for different TRPs (first BFD-RS set for first TRP, second BFD-RS set for second TRP). This allows the UE to independently monitor and detect beam failures for each TRP separately, rather than treating all TRPs as a single group. The segmentation enables selective monitoring where the UE can focus resources on active TRPs and reduce monitoring for disconnected TRPs, thereby reducing power consumption while maintaining detection reliability for each individual TRP.
2Stability of the object's composition
If the UE triggers BFR procedure only when all control beams of all TRPs fail, then the system stability is improved, but the beam failure detection speed deteriorates causing missed DCI detection
Solution Approach 1:
The patent divides the BFR triggering condition into separate evaluations for each TRP. Instead of requiring all TRPs to fail before triggering BFR, the system evaluates beam failure conditions independently for each TRP based on their respective BFD-RS sets. This allows the UE to trigger BFR procedures selectively when a specific TRP experiences beam failure, reducing detection time and preventing missed DCI detection while maintaining system stability through controlled, TRP-specific recovery procedures.
Solution Approach 2:
The patent implements dynamic BFR triggering where the decision to initiate beam failure recovery is adapted based on the current state of each individual TRP. The system dynamically evaluates beam failure conditions for each TRP separately and triggers BFR procedures only when necessary for specific TRPs, rather than using a static threshold that requires all TRPs to fail. This dynamic approach reduces detection time and allows the system to respond quickly to individual TRP failures while maintaining overall stability.
3Adaptability or versatility
If the UE performs measurements on all candidate beam RS lists to find candidate beams for BFR, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent segments the candidate beam measurement process by associating different candidate beam RS lists with different BFD-RS sets (and consequently different TRPs). This segmentation allows the UE to perform measurements on candidate beam lists selectively based on which TRP is experiencing beam failure, rather than always measuring all candidate beams from all TRPs. The segmented approach maintains adaptability by having multiple candidate lists available while reducing complexity through selective measurement of only relevant candidate beams for the failed TRP.
Data Source
AI summary
A UE for beam failure detection is provided. The UE includes a radio frequency (RF) signal processing device. The RF signal processing device receives a first candidate-beam reference-signal (RS) list and a second candidate-beam RS list and reports a beam failure information. The first candidate-beam RS list is associated with a first beam-failure-detection RS (BFD-RS) set and the second candidate-beam RS list is associated with a second BFD-RS set. The beam failure information includes at least one of following: at least on component carrier (CC) index, at least one new candidate beam, an identity of BFD-RS set, or an CORESETPoolIndex.