UE CSI-RS Beam Selection with Predicted Time Resources
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently measuring channel state information reference signals (CSI-RS) due to insufficient time to process downlink control information and switch to candidate UE beams for accurate CSI-RS acquisition.
Innovation Solution
User equipment (UE) predicts time resources for CSI-RS based on past scheduled aperiodic CSI-RS configurations, switches to candidate UE beams, and measures CSI-RS without waiting for downlink control information, potentially using the same beam for multiple slots to increase measurement likelihood.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE waits to process downlink control information to determine CSI-RS scheduling, then the control accuracy is improved, but the time to measure CSI-RS is delayed
Solution Approach 1:
The UE performs beam switching to the candidate UE beam in advance based on predicted time resources for CSI-RS, before actually receiving and processing the downlink control information. This preliminary beam switching action ensures that when the CSI-RS is transmitted, the UE is already positioned on the correct beam, eliminating measurement delays while maintaining accuracy.
2Measurement precision
If the UE switches to candidate UE beams for CSI-RS measurement, then the beam selection accuracy is improved, but the device complexity increases
Solution Approach 1:
The UE pre-identifies and switches to candidate UE beams based on predicted CSI-RS time resources before actual measurement. This preliminary action simplifies the overall process by eliminating the need for complex real-time beam selection algorithms during CSI-RS measurement, as the appropriate beam is already established in advance.
Solution Approach 2:
The UE autonomously performs beam switching and CSI-RS measurement without requiring complex network coordination or additional control signaling. By using predicted time resources and independently managing beam switching, the UE reduces the complexity of beam management while maintaining measurement accuracy.
3Reliability
If the UE uses the same beam for multiple slots, then the measurement reliability is improved, but the adaptability to changing channel conditions decreases
Solution Approach 1:
The UE performs beam switching in advance based on predicted time resources, establishing a stable beam configuration before CSI-RS measurement. This preliminary action ensures measurement reliability by avoiding beam switching during the actual measurement process, while the prediction mechanism allows the system to adapt to different scheduling scenarios.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may perform a set of synchronization signal block (SSB) measurements and select a serving UE beam and a set of candidate UE beams for measuring a channel state information (CSI) reference signal (CSI-RS) based on the set of SSB measurements. The UE may identify, or predict, time resources for the CSI-RS based on previous CSI-RS configurations. The UE may measure the CSI-RS based on the time resources using a candidate UE beam from the set of candidate UE beams. The UE may transmit, to an access network entity, a measurement report based on measuring the CSI-RS using the candidate UE beam or a last CSI-RS measurement on the serving UE beam.