UE Beam Failure Recovery in Multi-TRP 5G Networks
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Solution Overview
Problem
In 5G New Radio (NR) systems, during inter-cell multi-TRP/panel operations, user equipment (UE) can only perform Beam Failure Recovery (BFR) using reference signals from serving cells, leading to unnecessary interruptions, overheads, and delays due to incorrect beam failure detection from non-serving cells.
Innovation Solution
The UE is enhanced to receive and analyze beams from multiple cells, including non-serving cells, allowing it to determine beam failures and identify candidate beams based on signal quality from all cells, thereby preventing unnecessary BFR procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE monitors only serving cell reference signals for beam failure detection, then the detection process is simple, but beam failure detection becomes inaccurate in inter-cell multi-TRP/panel operations
Solution Approach 1:
The UE is enhanced to monitor reference signals from multiple cells (both serving and non-serving cells) for beam failure detection. The beam failure detection mechanism is made universal by allowing it to operate across different cell types, enabling accurate detection in inter-cell multi-TRP/panel operations while maintaining the same detection logic and thresholds used for serving cells.
2Productivity
If the UE performs BFR using only serving cell reference signals, then the BFR procedure is straightforward, but unnecessary BFR procedures are triggered in inter-cell multi-TRP/panel operations
Solution Approach 1:
The UE performs comprehensive beam quality assessment by monitoring reference signals from multiple cells and uses this feedback information to make informed BFR decisions. The network can configure different reference signals for different cells, and the UE provides feedback on beam quality metrics, enabling accurate identification of actual beam failures versus temporary signal variations in non-serving cells.
3Reliability
If the UE monitors reference signals from multiple cells, then beam failure detection accuracy improves, but the monitoring overhead increases
Solution Approach 1:
The network configures UE-specific reference signal monitoring settings that adapt to local conditions. The UE monitors reference signals from multiple cells but the specific configuration (which cells to monitor, which reference signals to use) is tailored to the local inter-cell multi-TRP/panel operation scenario. This allows reliable beam failure detection while optimizing monitoring overhead based on actual deployment conditions.
Data Source
AI summary
A terminal receives beams from a plurality of cells that include a non-serving cell and are formed by the same base station. The terminal determines a beam failure or a candidate beam by identifying received signals of the beams from the plurality of cells that include the non-serving cell.