Frequency-Selective Beam Reporting for mmWave CSI-RS Subbands
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing and reporting frequency-selective beams, particularly in high-frequency bands like mmWave and THz, due to hardware constraints and high channel propagation loss, which affect beamforming gain and signal coverage.
Innovation Solution
Implementing a frequency selective beam measurement and reporting (FSBMR) system that utilizes a transceiver and processor to measure and report beam metrics based on configured CSI-RS resources and settings, enabling frequency-selective beam management through joint phase-time array (JPTA) systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency selective beam measurement and reporting is implemented to improve beamforming gain, then signal coverage is enhanced, but device complexity increases due to additional measurement and reporting mechanisms
Solution Approach 1:
The frequency band is segmented into multiple subbands, and beam measurements are performed separately for each subband. This allows the system to identify frequency-selective beam characteristics without requiring complete remeasurement of the entire bandwidth, thereby improving signal coverage while managing complexity through divided measurement tasks.
Solution Approach 2:
The system performs preliminary beam measurements on a subset of frequency subbands to identify frequency-selective beams before full-scale beamforming operations. This preliminary identification reduces the overall complexity by pre-categorizing beams that require frequency-selective handling.
2Use of energy by moving object
If analog and hybrid beamforming architectures are used to reduce hardware costs, then power consumption decreases, but manufacturing precision requirements increase for analog components
Solution Approach 1:
The system applies different beamforming approaches to different frequency subbands based on measured characteristics. For subbands where frequency-selective beamforming provides significant gain, analog beamforming is used with relaxed precision requirements, while other subbands use hybrid approaches. This local optimization reduces overall power consumption while maintaining necessary precision only where critical.
Data Source
AI summary
Methods and apparatuses for frequency selective beam measurement and reporting (FSBMR) in a wireless communication system. A method for operating a user equipment (UE) includes receiving a configuration for a channel state information (CSI) reference signal (RS) resource and a CSI reporting setting to enable FSBMR. The method further includes receiving first information indicating a first set of frequency subbands for the CSI-RS resource and receive second information indicating a second set of frequency subbands for the CSI reporting setting. The method further includes measuring, based on the configuration and the first information, the CSI-RS resource and determining, based on the configuration, the measurement, and the second information, a beam report including one or more beam metrics.