A method includes calculating first high dimensional channel characteristics of a first frequency band in accordance with measurements of the first frequency band; estimating a power angle delay spectrum (PADS) in accordance with the first high dimensional channel characteristics of the first frequency band; determining a domain conversion matrix for a second frequency band in accordance with the PADS; and generating second high dimensional channel characteristics of the second frequency band in accordance with the domain conversion matrix and the first high dimensional channel characteristics of the first frequency band.

The present invention relates to a method for transmitting and receiving channel state information (CSI) and a device for same. Specifically, the method comprises the steps of: receiving setting information including information about a codebook; receiving a reference signal; measuring CSI on the basis of the reference signal; and transmitting the CSI, wherein the CSI is calculated on the basis of the codebook, which is formed by linear combination on the basis of multiple matrices, a first matrix of the codebook includes a plurality of column vectors set differently for each polarization of antenna ports, and the CSI includes precoding matrix indicators (PMIs) corresponding to indexes of the codebook.

A terminal according to an aspect of the present disclosure includes a receiving section that receives one piece of downlink control information (DCI) for scheduling a plurality of downlink shared channels (PDSCHs), and a control section that determines either a single TCI state or a plurality of TCI states for the plurality of PDSCHs in at least one of a first case and a second case, the first case being a case that a time offset from the DCI to the plurality of PDSCHs is shorter than a threshold, the second case being a case that a transmission configuration indication (TCI) field is not configured. According to an aspect of the present disclosure, QCL parameters for multi-panel/TRP can be appropriately determined.

A communication method includes receiving first signaling. The first signaling indicates a first reference signal resource. The first reference signal resource corresponds to P antenna ports. The method also includes receiving first indication information. The method further includes determining, by a processor, based on the first indication information, Q antenna ports that are in the P antenna ports and that are used to determine channel state information (CSI). Both P and Q are positive integers and P>Q.

The technology of this application relates to a beam pair training method and a communication apparatus. The method includes receiving configuration information sent by a network device, where the configuration information is used to configure a downlink reference signal resource set and a first uplink reference signal resource set associated with the downlink reference signal resource set, measuring, based on the downlink reference signal resource set by using a first antenna panel of a terminal device, a downlink reference signal sent by the network device, and sending a first uplink reference signal to the network device based on the first uplink reference signal resource set by using a second antenna panel of the terminal device. Based on the solution provided in this application, a simultaneous-reception beam pair or a simultaneous-transmission beam pair including beams generated by different antenna panels of the terminal device can be obtained through training.

Apparatuses and methods for frequency selective uplink precoding are provided. The method includes receiving configuration information about resource allocation for an uplink transmission, the configuration information indicating: allocated resources for uplink transmission, and uplink precoding information for G antenna port groups for the uplink transmission on the allocated resources, wherein the uplink precoding information indicates: SD basis vectors, FD basis vectors, coefficients for (SD, FD) basis vector pairs, and two components for the coefficients across the G antenna port groups; based on the uplink precoding information, applying uplink precoding for the G antenna port groups; and performing uplink transmission on the allocated resources according to the configuration information.

A method of identifying reference signal resources to be used in a transmission by a wireless device is disclosed. The method comprises a wireless device receiving signaling configuring the wireless device with a plurality of reference signal resource groups, each group comprising a plurality of reference signal resources. The wireless device subsequently receives an indication, in a control channel, of a selection of reference signal resources to be used. Each of the plurality of reference signal resources to be used is selected from a different one of the plurality of reference signal resource groups such that reference signal resources belonging to the same reference signal resource group are not selected for simultaneous use. A reference signal is then transmitted to a network node in the network using the indicated selection of reference signal resources.

A method to operate a wireless access point (WAP) that includes identifying multiple stations from uplink statistics of a plurality of uplinks and determining an optimal spatial state of an antenna array for reception of the plurality of uplinks. Channel state information (CSI) is evaluated for each antenna in the antenna array. Determining the optimal spatial state of the antenna array includes using the CSI for each antenna to extrapolate the optimal spatial state of the antenna array for the plurality of uplinks. The method further includes changing a spatial state of the antenna array to the optimal spatial state.

A customer premise equipment includes N antennas provided at intervals in a periphery of the equipment and provided with radiation surfaces facing at least three different directions; a radio frequency (RF) circuit configured to control the antennas to transmit and receive antenna signals and measure network information of the antenna signals; and a processor, connected to the RF circuit, configured to: configure first transceiving antenna groups from the N antennas, wherein the first transceiving antenna group are made up by M antennas, which are provided with two radiation surfaces adjacent to each other and facing different directions; obtain the network information of the antenna signals measured based on the first transceiving antenna groups; determine a target first transceiving antenna group based on the measured network information; and configure the RF circuit to control the target first antenna.

A method of a user equipment (UE) for an uplink power control is provided. The method comprises receiving, from a base station (BS), configuration information indicating a power scaling value (β) to be applied to a physical uplink shared channel (PUSCH) transmission, determining, based on the received configuration information, the power scaling value (β) for the PUSCH transmission from values of $\beta =1\mathrm{or}\beta =\frac{{\rho }_0}{\rho },$
where ρ.sub.0 is a number of antenna ports with a non-zero PUSCH transmission power and ρ is a number of sounding reference signal (SRS) ports, and transmitting the PUSCH transmission with a linear value ({circumflex over (P)}) of transmit power scaled based on the determined power scaling value (β), where the linear value ({circumflex over (P)}) of the transmit power after power scaling, β×{circumflex over (P)}, is divided equally across the antenna ports on which the UE transmits the PUSCH transmission with non-zero power.