Subband Measurement Reporting for Beam Squinting in SDM
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing beamforming and interference in wideband communications, particularly in high-frequency bands like FR2, where frequency-dependent changes in beams can lead to interference and reduce the suitability of beams for spatial division multiplexing (SDM) due to squinting effects.
Innovation Solution
The implementation of subband-based measurement reporting, where user equipment (UE) receives reference signals over a wideband and measures them across multiple subbands, allowing for the identification of preferred beam pairs and subbands with less interference, thereby optimizing beam selection for SDM communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wideband reference signals are transmitted over the entire bandwidth, then comprehensive channel coverage is achieved, but frequency-dependent beam squinting causes interference and reduces beam suitability for SDM
Solution Approach 1:
The patent divides the wideband bandwidth into multiple subbands and performs separate beam measurements for each subband. This segmentation allows the system to identify subbands where beams maintain stable directional characteristics without squinting effects, thereby resolving the contradiction between comprehensive coverage and beam reliability for SDM.
Solution Approach 2:
The patent applies different measurement and selection criteria to different subbands based on their local channel characteristics. By evaluating beam quality metrics (such as RSRP) independently for each subband and selecting subbands with preferred beam pairs, the system optimizes beam suitability for SDM in each local frequency region while avoiding subbands affected by beam squinting.
2Loss of information
If beam measurements are performed across the entire wideband, then complete channel information is obtained, but interference from beam squinting reduces measurement accuracy
Solution Approach 1:
The patent segments the wideband into subbands and performs measurements on each subband separately. This allows the system to obtain comprehensive channel information across the entire bandwidth while avoiding measurement errors caused by beam squinting in problematic frequency regions, thus maintaining both information completeness and measurement accuracy.
Solution Approach 2:
The patent extracts and identifies subbands with preferred beam pairs that are not affected by beam squinting interference. By separating these clean subbands from contaminated ones, the system can use the extracted subband information for accurate beam measurement and SDM configuration without the corrupting influence of frequency-dependent beam distortion.
3Productivity
If all available beams are used for SDM communications, then resource utilization is maximized, but beams affected by squinting effects cause interference and reduce communication performance
Solution Approach 1:
The patent segments the set of available beams into preferred beam pairs (for subbands without squinting) and non-preferred beams (for subbands with squinting effects). By configuring SDM communications only with preferred beam pairs identified through subband-based measurements, the system maximizes productive beam usage while excluding interfering beams, thus resolving the contradiction between resource utilization and communication performance.
Solution Approach 2:
The patent changes the selection parameter for beam configuration from a blanket wideband assessment to subband-specific beam quality metrics. By evaluating and selecting beams based on subband RSRP measurements and beam pair preferences, the system dynamically adjusts which beams are suitable for SDM in each subband, thereby maximizing productivity while avoiding harmful interference from squinting-affected beams.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, via multiple UE receive beams, one or more reference signals transmitted over a wideband, the wideband including one or more subbands. The UE may transmit a report based at least in part on one or more measurements of the one or more subbands. Numerous other aspects are described.