Methods and apparatuses for codebook restriction for type-II feedback reporting and higher layer configuration and reporting for linear combination codebook in a wireless communications network

US11251854B1 · kind B1 · utility

Assignee

• Max-Planck-Gesellschaft zur Föderung der Wissenschaften e.V. · US

Inventors

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

Key dates

• Filing date: Dec 16, 2019
• Grant date: Feb 15, 2022
• Expiry date: Dec 16, 2039

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04W88/08
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

Method performed by a UE for providing a channel state information (CSI) feedback in a wireless communication system including at least the UE and a gNB or a radio network node. The UE is operative to: estimate the MIMO channel between the gNB and the UE based on received DL reference signals for the configured resource blocks. The UE is further operative to calculate, based on a performance metric, a precoder matrix, for a number of antenna ports of the gNB and configured subbands, the precoder matrix being based on two codebooks and a set of combination coefficients for complex scaling/combining one or more of vectors selected from a first codebook and a second codebook, and the UE is operative to report a CSI feedback and/or a PMI and/or a PMI/RI, to the gNB, used to indicate the precoder matrix for the configured antenna ports and resource blocks.