Patent ID: 11936456
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. Method performed by a user equipment (UE) for providing channel state information (CSI) feedback in a form of one or more CSI reports in a wireless communication system (A), the method comprising:
receiving, from a network node (gNB) higher layer configuration(s) of one or more downlink reference signals, and one or more CSI report configuration(s) associated with the downlink reference signal configuration(s), and a radio signal, the radio signal including the downlink reference signal(s) according to the one or more downlink reference signal configuration(s),
the downlink reference signal(s) being provided over a configured number of frequency domain resources, time domain resources and one or more ports;
determining, for each CSI report, a precoding matrix based on the downlink reference signal(s) and two codebooks, the two codebooks including
a spatial codebook comprising one or more spatial domain (SD) basis components of a precoder, and
a delay codebook comprising one or more delay domain (DD) basis components of the precoder,

and one or more non-zero combining coefficients for complex combining of the one or more SD and DD basis vectors; and
reporting, to the network node, the one or more CSI reports for the one or more CSI report configurations,, wherein each CSI report contains a selected precoding matrix in the form of a precoding matrix identifier (PMI) and a rank identifier (RI) indicating the transmission rank for the RI layers of the precoding matrix, and wherein each CSI report comprises two parts: CSI part 1 and CSI part 2, wherein part 1 has a fixed payload size and comprises information indicating the size of the payload of part 2, wherein part 2 comprises at least the amplitude and phase information of the selected non-zero combining coefficients of the CSI report, and wherein a portion, or the entirety, of part 2 is available for omission from the CSI report, wherein CSI part 1 contains at least the information on the selected number of non-zero combining coefficients across all RI layers and an indication of the transmission rank for the RI layers of the selected precoding matrix, wherein CSI part 2 of the NREP CSI reports is segmented into TNREP+1 CSI subgroups, where TNREP is a total number of CSI subgroups associated with the NREP CSI reports, wherein T CSI subgroups are associated with a single CSI report, and one CSI subgroup contains information associated with all NREP CSI reports, and wherein each CSI subgroup is associated with a priority (priority level), wherein each CSI subgroup with the highest priority and associated with a single CSI report may contain at least a fraction of the bitmaps for the RI layers and the phase and amplitude information of a fraction of the KNZ combining coefficients.