Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Koninklijke Philips Corporation N.v.

Ramireddy Venkatesh

Markus Landmann

Marcus Grossmann

A method performed by a UE for providing CSI feedback in the form of CSI reports in a wireless communication system includes receiving, from a gNB, higher layer configurations of one or more downlink reference signals, and CSI report configurations associated with the downlink reference signal configurations, and a radio signal including the downlink reference signals according to the one or more downlink reference signal configurations, the downlink reference signals 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 signals and two codebooks, and one or more non-zero combining coefficients for complex combining of one or more spatial domain and delay domain basis vectors; and reporting to the network node the CSI reports for the CSI report configurations.

Three-component codebook based CSI reporting

Three component codebook based CSI reporting

The embodiments herein relate to a 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, by means of e.g. the processor () to: estimate the MIMO channel between the gl'JB () 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 antemia ports and resource blocks.

Methods and apparatuses for feedback reporting in a wireless communications network

The invention relates to a method performed by a combination of a radio network node, a network node, and a user equipment (device) for reducing s feedback overhead. The method performed by the user equipment (device) decomposes each entry corresponding to a (i,j)-th combining coefficient of a precoder matrix into at least two coefficients then quantizing, each of the at least two coefficients and reporting information related to at least one phase value or at least one amplitude value of the quantized coefficients.

Methods and apparatuses for reducing feedback overhead

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.

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

The embodiments herein relate to a 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, by means of e.g. the processor () 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.

The embodiments herein relate to method performed by a radio network node, a network node, a method performed by a UE and a UE for reducing feedback overhead. The method performed by the UE includes at least: decomposing each entry corresponding to a (i, j)-th combining coefficient of a precoder matrix into at least two coefficients; quantizing, separately, each of the at least two coefficients with a least one bit, and reporting information related to at least one phase value or at least one amplitude value or at least one phase value and an amplitude value of said quantized coefficient.

Growing community of inventors

Erlangen, Germany

Ramireddy Venkatesh