Beam Failure Detection Resource Selection Under TCI State Limits
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Solution Overview
Problem
The existing beam failure detection (BFD) mechanisms in 5G wireless communication systems face challenges in efficiently selecting and managing a subset of beam failure detection resources (BFD-RS) when the number of configured TCI states exceeds the maximum allowed BFD-RS, leading to issues with implicit configuration and high signaling costs in explicit configuration.
Innovation Solution
A mechanism is introduced for the UE to select a subset of N TCI states as BFD-RS based on predefined rules, ensuring both the UE and network have a consistent understanding of which resources are used for failure detection, even when the number of active TCI states (M) exceeds the maximum allowed BFD-RS (N < M).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If explicit configuration of BFD-RS is used, then beam failure detection accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the necessary subset of TCI states (N out of M) for BFD-RS configuration, rather than configuring all TCI states. This selective extraction reduces signaling overhead while maintaining detection accuracy for the most critical beams.
Solution Approach 2:
The patent segments the TCI states into different groups: some TCI states are configured for BFD-RS while others are not. This segmentation allows the system to focus resources on the most important beams for failure detection, reducing overall signaling requirements.
2Loss of information
If implicit configuration of BFD-RS is used, then signaling overhead is reduced, but beam failure detection reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-defining selection criteria and rules for choosing which TCI states become BFD-RS. Both network and UE have predetermined understanding of the selection methodology, eliminating the need for explicit signaling while ensuring consistent interpretation.
Solution Approach 2:
The patent changes the parameter of TCI state configuration from explicit to implicit by modifying the selection criteria. The implicit configuration uses predefined rules based on TCI state indices, activation status, and other parameters that both network and UE can independently evaluate to arrive at the same BFD-RS set.
3Reliability
If all configured TCI states are used for BFD-RS, then detection coverage is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential N TCI states from the total M configured states for BFD-RS purposes. This extraction reduces the number of resources the UE must monitor and manage, lowering device complexity while maintaining coverage for the most critical beams.
Solution Approach 2:
The patent applies partial action by configuring BFD-RS for only N TCI states rather than all M states. This partial configuration is sufficient for reliable beam failure detection while significantly reducing the computational and processing burden on the UE.
Data Source
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AI summary
According to an example aspect of the present invention, there is provided a method, comprising receiving at a user equipment configuration for M active transmission configuration indication states; selecting, according to one or more pre-defined rules,based on the configured M active transmission configuration indication states, a subset of N of the set of M transmission configuration indication states, where N<M; and determining by the user equipment beam failure detection resources based on the selected N transmission configuration indication states.