UE Beam Switching via QCL Type D Reference Signals
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Solution Overview
Problem
Current mobile and wireless telecommunication systems, such as 5G NR, face challenges in reducing latency and overhead in beam pair link switching, particularly in aligning transmit and receive beams between next-generation Node B and user equipment, which affects efficient communication.
Innovation Solution
The implementation of user equipment (UE)-initiated beam selection and activation based on beam reporting, allowing the UE to autonomously select and activate beams without network indication, using quasi-co-location (QCL) Type D reference signals to maintain beam alignment and reduce switching latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If network indicates beam selection for downlink communication, then beam alignment accuracy is improved, but switching latency and overhead increase
Solution Approach 1:
The user equipment autonomously selects and activates beams based on beam reporting without requiring network indication. The UE uses quasi-co-location Type D reference signals to determine appropriate beams independently, eliminating the need for network-side beam indication and reducing switching latency while maintaining alignment accuracy through self-based decision making
Solution Approach 2:
The system performs beam measurement and reporting in advance before actual communication begins. By pre-measuring beam qualities and reporting them to the network, the UE prepares beam selection information ahead of time, enabling faster beam switching when communication starts without requiring real-time network indication
2Reliability
If traditional beam switching procedure is used, then beam alignment is achieved, but communication efficiency decreases due to overhead
Solution Approach 1:
The invention extracts and removes the network indication step from the traditional beam switching procedure. By taking out the network indication requirement, the system eliminates the associated overhead and timing delays while maintaining beam alignment reliability through UE-based autonomous selection using quasi-co-location Type D reference signals
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for fast downlink beam switching assumptions related to quasi-colocation are provided. For example, a method can include determining whether a reported downlink reference signal corresponds to a reference signal, based on a spatial reception parameter corresponding to channel conditions and supporting beamforming, with a resource set that is configured to a user equipment with a tracking reference signal parameter. The method can also include interpreting a downlink reception parameter based on the determination regarding the reported downlink reference signal. The method can further include controlling at least a receive beam or a transmit beam of the user equipment based on the interpretation of the downlink transmission configuration indicator state.