US 12,224,828 B2
Method of type II CSI reporting for multiple spatial layers
Victor Sergeev, Nizhny Novgorod (RU); Alexei Davydov, Nizhny Novgorod (RU); Bishwarup Mondal, San Ramon, CA (US); and Dmitry Dikarev, Nizhny Novgorod (RU)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/430,642
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed Feb. 6, 2020, PCT No. PCT/US2020/017061
§ 371(c)(1), (2) Date Aug. 12, 2021,
PCT Pub. No. WO2020/167584, PCT Pub. Date Aug. 20, 2020.
Claims priority of provisional application 62/805,892, filed on Feb. 14, 2019.
Prior Publication US 2022/0182120 A1, Jun. 9, 2022
Int. Cl. H04B 7/06 (2006.01)
CPC H04B 7/0626 (2013.01) [H04B 7/063 (2013.01); H04B 7/0632 (2013.01); H04B 7/0634 (2013.01); H04B 7/0639 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of reporting channel state information (CSI) for multiple spatial layers comprising:
determining, by a user equipment (UE), a precoding matrix indicator (PMI) for a set of precoding matrixes, wherein the PMI is determined based on a combination of mutually orthogonal digital Fourier transformation (DFT) spatial domain (SD) vectors with DFT-based frequency-domain (FD) compression, wherein the mutually orthogonal DFT SD vectors are selected as N subsets of a plurality of oversampled DFT SD vectors and a total number of elements of the N subsets is fixed, where N is a positive number greater than 1; and
transmitting, by the UE, the PMI to a base station.