Methods and apparatuses for enhancement on basis subset indication for two-codebook based CSI reporting

US11901996B2 · kind B2 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Venkatesh Ramireddy · Erlangen, DE
• Marcus Grossmann · Erlangen, DE
• Markus Landmann · Erlangen, DE

Key dates

• Filing date: Apr 14, 2020
• Grant date: Feb 13, 2024
• Expiry date: Sep 16, 2040

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L25/0202
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

The present disclosure relates to methods and apparatuses (UE, network node or gNB) for CSI reporting. The method performed by a UE comprises: receiving from the gNB, a radio signal via a MIMO channel, wherein the radio signal contains at least one DL-RS according to a DL-RS configuration; estimating said MIMO channel based on said received at least one DL reference signal for configured subbands; calculating a precoder matrix or a CSI matrix for a number of antenna ports of the gNB and configured subbands; the precoder matrix based on a first codebook and on a second codebook and a set of combining coefficients for complex scaling/combining one or more of vectors selected from the first codebook and the second codebook; and reporting, to the gNB, a CSI feedback report and/or a PMI/RI, used to indicate the precoder matrix or the CSI matrix for the configured antenna ports and subbands.