US 12,308,918 B2
CSI reporting based on linear combination codebook
Marcus Grossmann, Erlangen (DE); and Venkatesh Ramireddy, Erlangen (DE)
Assigned to Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., (DE)
Appl. No. 18/038,268
Filed by Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Munich (DE)
PCT Filed Nov. 23, 2021, PCT No. PCT/EP2021/082709
§ 371(c)(1), (2) Date May 23, 2023,
PCT Pub. No. WO2022/106730, PCT Pub. Date May 27, 2022.
Claims priority of application No. 20209350 (EP), filed on Nov. 23, 2020.
Prior Publication US 2023/0421220 A1, Dec. 28, 2023
Int. Cl. H04B 7/06 (2006.01); H04B 7/0456 (2017.01); H04W 24/10 (2009.01)
CPC H04B 7/0626 (2013.01) [H04B 7/0456 (2013.01); H04W 24/10 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method performed by a user equipment (UE) for generating a channel state information (CSI) report in a wireless communication system, the method comprising:
receiving from a network node, a CSI report configuration information including at least one parameter, D, for indicating a first basis set of D basis vectors used for constructing for each transmission layer a precoding vector or matrix for a rank set, wherein the first basis set is a subset of a basis set comprising N3 basis vectors, each vector of size N3×1, wherein D<N3, and N3 is a number of subbands;
identifying a precoding vector or matrix for each transmission layer based on the first basis set, a second basis set comprising P basis vectors, and a number of combining coefficients for combining selected vectors from the first and second basis sets;
generating a CSI report based on the CSI report configuration information for a rank indication value (RI) or v of the rank set, wherein the CSI report comprises for each transmission layer or subsets of transmission layers or all transmission layers an indication of a subset of P′ selected basis vectors from the second basis set, wherein P′<P or P′≤P, and for each of the P′ basis vectors an indication of D′<D or D′≤D selected basis vectors from the first basis set, wherein a maximum number, K0, of combining coefficients per layer, or subset of layers, or all layers of the precoding vector or matrix contained in the CSI report is defined by K0=αP, wherein α<1 or a α∈{0.5,0.75, 1,1.25,1.5,2}; and
transmitting the CSI report to the network node.