UE Beam Switching via Reference Signal Refinement
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in beam switching during user equipment (UE) beam refinement procedures, leading to suboptimal UE beam selection after network node beam switches, especially when beams are associated with different or the same wide beams.
Innovation Solution
The implementation of a method where a UE receives a reference signal via a first network node beam and an indication to switch to a second network node beam, allowing for appropriate UE beam selection based on beam refinement procedures, using MAC-CE signals to prompt optimal beam switching, even when beams are associated with different or the same wide beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network node switches beams during UE beam refinement procedure, then the network node can maintain connection with the UE, but the UE may select suboptimal beams leading to reduced communication quality
Solution Approach 1:
The network node transmits a reference signal via the first network node beam before the beam switch occurs, enabling the UE to perform beam refinement measurements in advance. This preliminary action allows the UE to identify the optimal UE beam corresponding to the first network node beam before the switch, ensuring accurate beam selection after the network node beam switch.
Solution Approach 2:
The UE performs beam refinement measurements by receiving the reference signal and provides feedback information about the measured beam qualities. This feedback mechanism enables the UE to identify the optimal beam pair link, ensuring that the UE selects the correct beam after the network node beam switch while maintaining connection reliability.
2Measurement precision
If the UE performs beam refinement procedure, then the UE can identify optimal beams, but the process requires additional time and signaling overhead
Solution Approach 1:
The beam refinement procedure is executed before the network node beam switch, allowing the UE to pre-identify the optimal UE beam. This timing arrangement minimizes the actual beam switching delay by ensuring that all measurements and selections are completed before the switch occurs, reducing the time loss during the transition.
Solution Approach 2:
The reference signal transmission and beam refinement procedure are integrated into the ongoing beam management process, ensuring continuous useful action without interrupting the connection. The UE continuously monitors reference signals and maintains beam refinement capability, eliminating idle time during beam transitions.
3Adaptability or versatility
If the UE switches to a beam that does not match the network node beam, then the UE can maintain beam diversity, but communication quality deteriorates
Solution Approach 1:
The UE measures the reference signal transmitted via the first network node beam and provides feedback on the measured beam qualities. This feedback enables the UE to identify the UE beam that best matches the network node beam, ensuring optimal beam pairing while maintaining beam diversity capability for future adaptations.
Solution Approach 2:
The UE performs beam refinement measurements before the network node beam switch to pre-identify the optimal matching beam pair. This preliminary identification ensures that when the network node switches beams, the UE can immediately switch to the corresponding optimal beam, maintaining both beam diversity and communication quality.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, for a UE beam refinement procedure, a reference signal via a first network node beam. The UE may receive, based at least in part on the UE beam refinement procedure, an indication of a switch to the first network node beam from a second network node beam. Numerous other aspects are described.