Abstract: The embodiment of the present disclosure relates to methods and apparatuses for enhancing the reporting of the channel state information (CSI) with respect to multiple downlink resources A method performed by a UE comprises: receiving (401), from a network node, a CSI report configuration which provides a number N of reference signal resources for channel measurement; performing (402) measurements on said N RS resources; calculating (403) or determining one or more CSI quantities for a number M of selected RS resources; and transmitting (404), to the network node, a CSI report including the calculated or determined CSI quantities, wherein the CSI report comprises two parts—part 1 and part 2—, and wherein the content contained in part 1 indicates the size of part 2. There is also disclosed a UE (600), a method performed in a network node (700) and a network node (700).

Abstract: A communication device for providing a channel state information, CSI, feedback in a wireless communication system includes a transceiver to receive, from a transmitter a radio signal via a time-variant, frequency-selective MIMO channel, the radio signal including downlink reference signals according to a reference signal configuration including a number of antenna ports, and downlink signals including the reference signal configuration; and a processor. The processor estimates an explicit CSI in the frequency domain using measurements on the downlink reference signals on the radio channel, selects a Doppler-delay precoder matrix (W) for a composite Doppler-delay-beam three-stage precoder, calculates either one or more of a channel quality indicator, CQI, and/or a precoder matrix indicator, PMI, and/or a rank indicator, RI, and reports to the transmitter the CSI feedback including either one or more of the CQI, and/or the PMI and/or the RI.

Abstract: A receiver processes a radio signal received via a radio channel from a transmitter employing a plurality of antenna ports, determines complex precoder coefficients and delays of one or more space-delay precoders for one or more transmission layers and antenna ports at the transmitter so as to achieve a predefined property for a communication over the radio channel, and feeds back, explicitly or implicitly, delays and the complex precoder. The space-delay precoder has a dual-stage structure having a spatial codebook matrix including spatial beamforming vectors, a frequency-domain codebook matrix, and a combining element per layer for complex scaling or combining one or more of the vectors selected from the spatial and/or frequency-domain codebook matrices. The frequency-domain codebook matrix is defined by a sub-matrix of a DFT matrix, which the sub-matrix of the DFT matrix is associated with a range of delay values.

Abstract: 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 comprises 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 said 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.

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.

Abstract: A communication device providing CSI feedback in a wireless communication system includes a transceiver to receive downlink reference signals and downlink signals including a reference signal configuration. A processor estimates an explicit CSI in the frequency domain. The processor selects a Doppler-delay-beam precoder matrix for a composite Doppler-delay-beam three-stage precoder, which is based on one or more codebooks including one or more transmit-side spatial beam components, one or more delay components, and one or more Doppler-frequency components. The processor calculates a CQI and/or a PMI and/or a rank indicator, RI, using the explicit CSI and the composite Doppler-delay-beam three-stage precoder, and reports the CSI feedback including the CQI, and/or the PMI and/or the RI. The one or more delay and/or Doppler-frequency components are defined by one or more sub-matrices of a DFT matrix or an oversampled DFT matrix.

Abstract: A communication device for providing a channel state information, CSI, feedback in a wireless communication system includes a transceiver to receive, from a transmitter a radio signal via a time-variant, frequency-selective MIMO channel, the radio signal including downlink reference signals according to a reference signal configuration including a number of antenna ports, and downlink signals including the reference signal configuration; and a processor. The processor estimates an explicit CSI in the frequency domain using measurements on the downlink reference signals on the radio channel, selects a Doppler-delay precoder matrix (W) for a composite Doppler-delay-beam three-stage precoder, calculates either one or more of a channel quality indicator, CQI, and/or a precoder matrix indicator, PMI, and/or a rank indicator, RI, and reports to the transmitter the CSI feedback including either one or more of the CQI, and/or the PMI and/or the RI.

Abstract: 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.

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.

Abstract: The present disclosure relates to methods and apparatuses for generating and reporting a CSI report.

Abstract: The invention describes a method performed by a radio network node, a network node, a method performed by a UE and a UE for reducing s feedback overhead. The method performed by the UE is decomposing each entry corresponding to a combining coefficient of a precoder matrix into at least two coefficients and quantizing, separately, each of two coefficients with a least one bit, and reporting information related to a phase value or an amplitude value or at a phase value and an amplitude value of the quantized coefficient.

Abstract: The embodiment of the present disclosure relates to methods and apparatuses for enhancing the reporting of the channel state information (CSI) with respect to multiple downlink resources. A method performed by a UE comprises: receiving, from a network node, a CSI report configuration which provides a number N of reference signal resources for channel measurement; performing measurements on said N RS resources; calculating or determining one or more CSI quantities for a number M of selected RS resources; and transmitting, to the network node, a CSI report including the calculated or determined CSI quantities, wherein the CSI report comprises two parts—part 1 and part 2—, and wherein the content contained in part 1 indicates the size of part 2. There is also disclosed a UE, a method performed in a network node and a network node.

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.

Abstract: Methods and apparatuses for enhancing the reliability and performance of the PDCCH in a wireless network. The method performed by a UE comprises: receiving a configuration of search space sets for the PDCCH, each search space set comprises a number of PDCCH candidates made up of a number of resource elements; monitoring for DCIs of a specific format as indicated in the configured PDCCH candidates; wherein a configuration an indication of an association of the search space sets with a search space set pool is provided to the UE, and at least two PDCCH candidates from the search space sets are associated with the same DCI content, or an association of two or more TCI states with a single CORESET is obtained from the network node; and applying the configuration(s) or indication of the association for receiving one or more PDCCH(s) on the search space sets.

Abstract: 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.

Abstract: A communication device providing CSI feedback in a wireless communication system includes a transceiver to receive downlink reference signals and downlink signals including a reference signal configuration. A processor estimates an explicit CSI in the frequency domain. The processor selects a Doppler-delay-beam precoder matrix for a composite Doppler-delay-beam three-stage precoder, which is based on one or more codebooks including one or more transmit-side spatial beam components, one or more delay components, and one or more Doppler-frequency components, The processor calculates a CQI and/or a PMI and/or a rank indicator, RI, using the explicit CSI and the composite Doppler-delay-beam three-stage precoder, and reports the CSI feedback including the CQI, and/or the PMI and/or the RI. The one or more delay and/or Doppler-frequency components are defined by one or more sub-matrices of a DFT matrix or an oversampled DFT matrix.

Abstract: Methods and apparatuses for channel state information (CSI) reporting in a wireless communications network are described. One method performed by a wireless device includes receiving the CSI report configuration and a higher layer configuration indicating a subset of spatial-domain components from a set of spatial-domain components and a maximum average amplitude value or power for restricting an average amplitude or power of the combination coefficients associated with the spatial-domain component in the subset of spatial-domain components. The method may also include determining a spatial-domain component from a set spatial-domain components, a time-domain components from a set of time-domain components, and a frequency-domain components from a set of frequency-domain components, and generating and transmitting or the CSI report which may include an indication of the determined spatial-, frequency- and time-domain components, and combination coefficients of the precoder vector or matrix.

Abstract: 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.

Abstract: A method performed by a user equipment (UE) includes receiving, from a network node via a physical downlink control channel (PDCCH) or a higher layer signaling, a transmission configuration indication (TCI)-state indication for M TCI-states, where M>1. The method may also include applying the M TCI-states to transmission occasion or parts thereof of a physical channel according to a predetermined or indicated mapping of the M TCI-states or applying the M TCI-states to one or more reference signal (RS) resources or one or more RS resource sets according to a predetermined or indicated mapping of the M TCI-states.

Abstract: A base station is configured to control a wireless communication network cell of a wireless communication network and is configured to use a coarse position information related to a coarse position of a user equipment to determine a direction towards the user equipment. The base station is configured to transmit a positioning signal to the user equipment and to direct the transmission of the positioning signal towards the user equipment. The positioning signal is adapted to allow for a determining of a fine position information relating to the user equipment.