Default Beam Selection via Selected Coresets
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Solution Overview
Problem
In wireless communication systems, particularly in unlicensed frequency spectra, the existing methods for determining default beams during Channel Occupancy Time (COT) can lead to incorrect beam selection, degrading communication quality due to the reliance on Quasi-Co-Location (QCL) assumptions that may not align with successful Clear Channel Assessment (CCA) results.
Innovation Solution
The base station indicates selected CORESETs or QCL assumptions to the User Equipment (UE), allowing the UE to determine a default beam based on successful CCA beams, ensuring accurate beam alignment for communication during COT.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE determines default beam based on QCL assumptions from all configured CORESETs, then beam selection coverage is improved, but beam selection accuracy deteriorates due to mismatch with successful CCA results
Solution Approach 1:
The patent extracts only the subset of CORESETs that were successfully transmitted during COT (those that passed CCA) from the full set of configured CORESETs. The UE is indicated to monitor only these selected CORESETs for default beam determination, thereby extracting the relevant information needed for accurate beam selection while discarding irrelevant QCL assumptions from unsuccessful CORESETs.
Solution Approach 2:
The patent applies local quality by providing different monitoring configurations to different UEs based on their specific scenarios. The base station indicates to each UE which specific CORESETs from the configured set should be monitored for default beam determination, allowing each UE to have customized beam selection criteria matched to the actual successful transmissions in its local context.
2Adaptability or versatility
If the base station configures multiple CORESETs with different QCL assumptions, then beam diversity is improved, but device complexity increases due to additional monitoring and determination procedures
Solution Approach 1:
The patent extracts only the necessary subset of CORESETs for default beam determination. Instead of requiring the UE to monitor and process QCL assumptions from all configured CORESETs, the base station indicates specifically which CORESETs (those successfully transmitted during COT) should be monitored, thereby reducing the monitoring burden while preserving beam diversity benefits.
Solution Approach 2:
The indicated CORESETs serve multiple functions: they are used for both downlink control information transmission and for default beam determination. This multi-functionality reduces the need for separate reference signals or additional signaling mechanisms, simplifying the overall system while maintaining beam diversity.
3Ease of operation
If the UE uses QCL assumptions from the lowest CORESET ID, then beam selection simplicity is improved, but communication quality deteriorates due to incorrect beam selection in unlicensed spectra
Solution Approach 1:
The base station performs preliminary action by determining which CORESETs were successfully transmitted during COT before indicating them to the UE. This pre-selection ensures that the UE receives indications only for CORESETs that actually passed CCA, eliminating the need for the UE to complexly evaluate which QCL assumption to use while ensuring correctness.
Solution Approach 2:
The system implements feedback by having the base station monitor CCA results and feed back to the UE which specific CORESETs were successfully transmitted. This feedback mechanism allows the UE to align its default beam determination with the actual channel conditions and successful transmissions, improving communication quality while maintaining simple operation.
Data Source
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AI summary
In order to overcome problems that a UE may face in determining a default beam for communication with the base station during a COT, a method, apparatus, and computer-readable medium are provided for a base station to indicate to the UE which CORESET(s), QCL assumptions, UL resources, and/or spatial relationships are selected for a COT. A UE receives, from a base station, an indication corresponding to a COT. The indication is for at least one of a set of CORESETs, a set of QCL assumptions, a set of UL resources, or a set of spatial relations for determining a default beam. The UE determines the default beam from the base station for use during the COT based on the indication. The UE transmits or receives a transmission using the default beam.