Precoding matrix reporting

WO2026129191A1PCT designated stage Publication Date: 2026-06-25TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) +1
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Filing Date
2024-12-18
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Existing codebooks for precoding matrices in MIMO systems fail to account for varying wavefront curvatures, leading to reduced array gain and spatial multiplexing gains when wavefronts are non-spherical, particularly in massive MIMO systems with larger antenna arrays.

Method used

Implement codebooks that consider different wavefront curvatures by calculating precoding matrices based on channel conditions from downlink reference signals, using codebook parameters that accommodate varying radii of curvature in principal planes.

Benefits of technology

Enhances spatial multiplexing gains and reduces array gain loss by adapting precoding matrices to real-world wavefront conditions, improving communication performance in diverse propagation environments.

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Abstract

There is provided techniques for precoding matrix reporting. A method is performed by a first radio transceiver device. The method comprises receiving configuration of precoding matrix reporting from a second radio transceiver device. The configuration pertains to codebook parameters for precoding matrices that take into account different wavefront curvatures. The method comprises receiving, at an antenna of the first radio transceiver device, downlink reference signals from the second radio transceiver device. The method comprises calculating, based on channel conditions as obtained from measurements on the received downlink reference signals, a precoding matrix according to the codebook parameters for the different wavefront curvatures. The method comprises reporting, to the second radio transceiver device, the precoding matrix.
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