US 12,034,508 B2
Smaller sub-band size for PMI than for CQI
Niklas Wernersson, Kungsängen (SE); Sebastian Faxér, Järfälla (SE); and Maksym Girnyk, Solna (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Filed on Feb. 27, 2023, as Appl. No. 18/174,712.
Application 18/174,712 is a continuation of application No. 17/551,800, filed on Dec. 15, 2021, granted, now 11,595,098.
Application 17/551,800 is a continuation of application No. 16/981,507, granted, now 11,206,070, previously published as PCT/SE2019/051067, filed on Oct. 28, 2019.
Claims priority of provisional application 62/755,127, filed on Nov. 2, 2018.
Prior Publication US 2023/0268970 A1, Aug. 24, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 7/06 (2006.01)
CPC H04B 7/0632 (2013.01) [H04B 7/0634 (2013.01); H04B 7/0639 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method performed by a wireless device for transmitting channel state information, CSI, feedback using a multi-beam precoder codebook, the method comprising:
receiving a configuration for a sub-band size for channel quality indicator, CQI, reporting and a sub-band size for precoding matrix indicator, PMI, reporting, wherein the sub-band size for PMI reporting is smaller than the sub-band size for CQI reporting; and
transmitting the CSI feedback to a base station, wherein the CSI feedback is in accordance with the sub-band size for CQI reporting and the sub-band size for PMI reporting, wherein the CSI feedback indicates a precoder vector for each of a plurality of frequency sub-bands having the sub-band size for PMI reporting, wherein each of the precoder vectors is a linear combination of vectors, and wherein the coefficients for the vectors in the linear combinations of vectors are parameterized in the frequency-domain as a linear combination of a set of basis vectors and a set of coefficients for the basis vectors in the linear combination of the set of basis vectors.