Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine a set of recommended base station transmit beams for full duplex operation based at least in part on measurements of a set of base station transmit beams and measurements of self-interference associated with the set of base station transmit beams. The UE may transmit a report that indicates a recommendation to use one or more of the set of recommended base station transmit beams for full duplex operation. Numerous other aspects are described.

The present disclosure relates to channel learning and power transmission in wireless power networks. A method of estimating channels between a transmitter and a plurality of receivers in a wireless power network is described. The transmitter comprises an array of wireless power transmission antennas. The method comprises: transmitting a pilot signal from the wireless power transmission antennas of the transmitter; receiving feedback signals from each receiver of the plurality of receivers, the feedback signals comprising received signal power indications for each respective receiver; calculate channel matrices for channels between the wireless transmission antennas and wireless power reception antennas of each respective receiver by minimizing an objective function of a channel matrix and the received signal power indications for the respective receiver; and estimating spatial channel signatures of the reception antennas on the array of wireless power transmission antennas from the dominant eigenvalue and corresponding eigenvector of the respective channel matrix.

Methods, systems, and devices for wireless communication are described. For example, the described techniques provide for a base station to determine and indicate to a UE (e.g., via control signaling) a configuration for layer one (L1) reporting of non-serving cells including, for example, a number of beams or cells for which the UE is to report metrics. The UE may receive the control signaling and measure or otherwise obtain metrics for beams of a serving cell of the UE, at least one non-serving cell of the UE, or beams of a non-serving cell of the UE. The UE may also identify an index associated with at least the one non-serving cell or indices of beams of the non-serving cell which the UE may use to identify the metrics in a L1 report. Accordingly, the UE may generate and transmit an L1 report to the base station.

A user equipment (UE) for channel state information (CSI) feedback comprises a transceiver configured to receive, from a base station (BS), configuration information for the CSI feedback, the configuration information indicating a number of antenna panels (N.sub.g) at the BS and a codebook mode, wherein N.sub.g>1 and each of the antenna panels comprises antenna ports with a first polarization (P.sub.1) and antenna ports with a second polarization (P.sub.2). The UE further comprises a processor operably connected to the transceiver, the processor configured to identify the number of antenna panels (N.sub.g) at the BS, identify a codebook for the CSI feedback based on the codebook mode configured between a first codebook mode and a second codebook mode, and generate the CSI feedback using the identified codebook. The transceiver is further configured to transmit the generated CSI feedback to the BS.

The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for initiating a random access procedure in a carrier aggregation system, the method comprising: receiving, from a network, a Radio Resource Control (RRC) signal which configures a Physical Uplink Control Channel (PUCCH) resource for a cell in a Timing Advance Group (TAG); checking whether a Time Alignment Timer (TAT) associated with the TAG to which the cell with PUCCH resource belong is running or not; and initiating a random access procedure if the associated TAT is not running.

Disclosed is a method for supporting uplink multiple-input and multiple-output (MIMO) in a wireless communication system. A method for transmitting data according to the present invention comprises the steps of: mapping, to first orthogonal frequency division multiplexing (OFDM) symbols within a subframe, first demodulation reference signals (DMRSs) corresponding to a first antenna port and a second DMRSs corresponding to a second antenna port; mapping, to second OFDM symbols except the first OFDM symbols within the subframe, first data corresponding to the first antenna port and second data corresponding to the second antenna port; and transmitting the subframe by using resources allocated to the uplink, wherein predetermined precodings are applied to the first data and the second data, and the predetermined precodings may be changed according to the index of the second OFDM symbols.

Discloses is a method in which a user equipment (UE) reports channel state information to an evolved Node B (eNB) for beamforming based on multiple antennas in a wireless communication system. Specifically, the method comprises the steps of: receiving information on a plurality of reference signal resources from the eNB; generating channel state information containing information related to one preferred precoder to be applied to the plurality of reference signal resources in common and information related to one linking precoder for connecting the plurality of reference signal resources; and reporting the channel state information to the eNB, wherein the multiple antennas are partitioned into sections of row or column units and the plurality of reference signal resources correspond to the sections.

A UE may select a first beam for communication with a base station. The UE may attempt, through the selected first beam, at least one RACH procedure with the base station. The UE may determine that the at least one RACH procedure failed with the base station. The UE may send, after a successful RACH procedure with the base station, information indicating that the at least one RACH procedure failed. In an aspect, the UE may select a new beam for communication with the base station after the determination that the at least one RACH procedure failed, and at least a portion of the successful RACH procedure may be performed through the selected new beam.

A CSI measurement method, a CSI acquisition method, a terminal and a network device are provided, to measure CSI. The terminal performs interference measurement to acquire initial interference measurement result, determine the CSI based on the initial interference measurement result and an interference measurement parameter configured by the network device, and then report the determined CSI to the network device. The interference measurement parameter is configured by the network device, so the interference measurement parameter configured by the network device is capable of reflecting an actual situation of interference information, and interference information acquired by the terminal based on the interference measurement parameter matches interference information for actual transmission in a better manner. As a result, it is able to improve a matching degree between the interference information acquired by the terminal and the interference information for the actual transmission, thereby to enable a network to select a more appropriate parameter for link adaptation.

Aspects of the present disclosure provide apparatus and techniques that may be applied in systems for improving reliability of cell selection to ensure that a UE is capable of transmitting on the uplink in addition to receiving on the downlink upon mobility An exemplary method, performed by a user equipment (UE), generally includes receiving reference signals from one or more transmission reception points (TRPs) in a wireless communications network, pre-selecting, based on the received reference signals, a first TRP, of the one or more TRPs, from which to receive wireless service, transmitting an uplink (UL) signal to the first TRP, receiving, from the first TRP, feedback comprising information about the UL signal, and determining, based at least in part on the feedback, to select the first TRP from which to receive the wireless service.