UE Beam Selection Using Uplink Power and Spectral Efficiency
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Solution Overview
Problem
Existing beam selection techniques in wireless communications systems do not adequately consider uplink performance, leading to suboptimal selection of candidate UE beams for channel state information reference signal measurements, which can result in low performance for uplink communication.
Innovation Solution
The UE selects candidate beams for measuring CSI-RS based on power measurements for uplink transmissions, refines the beam list using SSB measurements, and chooses a serving beam based on spectral efficiency, incorporating virtual power headroom and power threshold calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing beam selection techniques are used without uplink consideration, then the beam selection process is simple, but uplink communication performance deteriorates
Solution Approach 1:
The UE performs power measurements for uplink transmissions and calculates virtual power headroom values before selecting candidate beams for CSI-RS measurements. This preliminary assessment of uplink capabilities ensures that beams suitable for both downlink and uplink communications are selected, preventing uplink performance deterioration while maintaining a manageable selection process through structured pre-evaluation criteria
Solution Approach 2:
The beam selection process incorporates multiple parameters including power measurements, virtual power headroom values, and SSB measurements to evaluate candidate beams. By changing the selection criteria from simple downlink-based metrics to a multi-parameter approach that includes uplink-specific parameters, the system achieves reliable uplink communication while the structured parameter evaluation prevents excessive complexity
2Measurement precision
If multiple candidate beams are evaluated for CSI-RS measurements, then beam selection accuracy improves, but measurement time and processing complexity increase
Solution Approach 1:
The UE identifies a subset of candidate beams that meet specific criteria based on power measurements and virtual power headroom values before performing CSI-RS measurements. This localized filtering approach ensures that only beams with potential for both downlink and uplink performance are measured in detail, improving beam selection accuracy while reducing the number of time-consuming measurements required
Solution Approach 2:
Power measurements and virtual power headroom calculations are performed in advance to pre-filter candidate beams before conducting CSI-RS measurements. This preliminary action reduces the set of beams that require detailed measurement, thereby improving the accuracy of beam selection through more thorough evaluation of promising candidates while minimizing the total measurement time by excluding unlikely candidates early
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may select a set of candidate UE beams for measuring channel state information (CSI) reference signal (CSI-RS) based on one or more power measurements for uplink transmissions. The UE may measure multiple synchronization signal blocks (SSBs) using the set of candidate UE beams and select a subset of the selected candidate beams based on the SSB measurements. The UE may measure spectral efficiency via the resource carrying the CSI-RS using the subset of candidate UE beams and select a serving beam from the subset based on the spectral efficiency of each beam. The UE may calculate the power measurements based on a difference between a power threshold and a reference power value for each candidate beam.