Beam Failure Detection Using Mixed DMRS and CSI-RS
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face inefficiencies in beam failure detection (BFD) procedures due to the reliance on CSI-RS resources, which can lead to increased resource usage and reduced flexibility in beam management.
Innovation Solution
The implementation of DMRS for BFD, allowing for reduced CSI-RS resource configuration and enabling BFD across multiple transmission configuration indicator states, combined with CSI-RS and SSB, to enhance beam failure detection and recovery processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSI-RS resources are used for beam failure detection, then beam failure detection can be performed, but resource usage increases and flexibility in beam management is reduced
Solution Approach 1:
The DMRS, originally designed for demodulation purposes, is made to serve dual functions by enabling both channel estimation for data reception and beam failure detection. This multi-functionality eliminates the need for separate dedicated reference signals for BFD, thereby reducing overall resource consumption while maintaining detection capability
Solution Approach 2:
The patent combines the beam failure detection function with the existing DMRS resource configuration. By merging BFD capabilities into the DMRS framework, the system utilizes already-configured reference signals for both demodulation and beam monitoring, thereby reducing the quantity of separate CSI-RS resources needed
2Reliability
If CSI-RS resources are used for beam failure detection, then beam failure detection can be performed, but flexibility in beam management is reduced
Solution Approach 1:
The DMRS is designed to serve multiple purposes including demodulation, channel estimation, and beam failure detection. This multi-functionality provides flexibility in beam management as the same reference signal structure can be adapted across different beam configurations and transmission modes without requiring separate dedicated resources
Solution Approach 2:
The patent enables dynamic beam failure detection by allowing the UE to monitor DMRS on multiple TCI states. The system can dynamically adapt to beam changes and switch between different TCI states based on detection results, providing greater flexibility compared to static CSI-RS based approaches
3Adaptability or versatility
If multiple TCI states are monitored for beam failure detection, then beam options increase, but measurement and comparison complexity increases
Solution Approach 1:
The patent implements a simplified measurement approach where the UE monitors DMRS on multiple TCI states but only needs to determine if any single beam meets the threshold criterion for beam failure declaration. This partial action approach (checking if any beam is sufficient rather than evaluating all beams comprehensively) reduces complexity while maintaining multiple beam options
Solution Approach 2:
The patent divides the beam failure detection process into separate measurement and evaluation stages. The UE measures RSRP for each TCI state independently and then compares results against configured thresholds, allowing the complex multi-beam monitoring to be broken down into manageable discrete operations
Data Source
AI summary
Aspects presented herein may improve the performance and/or efficiency of a BFD procedure for a UE, where the UE may use DMRS to perform the BFD to reduce the occasion(s) of configuring multiple or frequent CSI-RS resources sets for the UE. In one aspect, an apparatus measures RSRP of one or more reference signals in a reference signal set for a BFD, the one or more reference signals include at least one DMRS. Then the apparatus compares the measurement for the at least one DMRS to a threshold. Then the apparatus initiates or restarts a BFD timer or a BFR procedure based at least in part on the measurement.