Methods, systems, and devices for wireless communication are described. A user equipment (UE) may monitor a first control channel in a first frequency band. The UE may determine that a bandwidth capability of the UE supports communicating on the first frequency band and at least a second frequency band. The UE may perform a channel measurement procedure on the first frequency band and the second frequency band concurrently. The UE may transmit a channel feedback message including information associated with the channel measurement procedure.

A method and apparatus for performing precoding matrix indicator (PMI) feedback are provided. The apparatus may include at least one storage device containing a computer program, at least one processing circuit and related control/computing devices. The at least one processing circuit is configured with at least one storage device and computer program to feed back the selected PMI and to receive related signalings of the PMI feedback method. One of the signalings includes the precoder candidate set configuration which defines the subset of precoders in a codebook for each precoder to report PMI next time. The selected PMI is transmitted by the apparatus to the corresponding communication device in the communication network.

A wireless communication method for a terminal, a terminal, and a wireless communication system receive one or more Channel State Information Reference Signals (CSI-RSs). Further, quantization of combination coefficients of the one or more CSI-RSs corresponding to one or more spatial beams Discrete Fourier Transform (DFT) basis vector amplitudes is performed.

The present disclosure provides a method of generating codebook in a wireless communication system with multiple antenna arrays, as well as a wireless communication system, base station and terminal using the codebook for communication. The method comprises steps of: providing a basic codebook which contains multiple pre-coding matrices; and assigning phase offsets to certain pre-coding matrices in the basic codebook to form a codebook with phase offset. The feedback overhead from a client to a base station side is reduced and a good precision of feedback for multi-antenna array is kept by applying the method of generating codebook and using the generated codebook in the wireless communication system, base station and terminal.

A method in a user equipment, UE, for reporting channel state information, CSI, to a network includes determining a number of subbands of a bandwidth part, BWP, to report CSI. The method further includes determining a CSI computation time including a CSI computation delay requirement. The method further includes performing CSI estimation for a plurality of the number of subbands based on the CSI computation time. The method further includes reporting the CSI report for at least one of the number of subbands. Analogous UEs, computer programs and computer program products are also provided.

A transmission control method includes sending, by a terminal, uplink control information (UCI) in a first format of the UCI to a radio access network device, where the UCI includes at least one of measurement result information of beam groups or information of the beam groups. The measurement result information of the beam groups includes a measurement result of a first beam group and an offset of a measurement result of a second beam group relative to the measurement result of the first beam group. The measurement result of the first beam group is a reference measurement result, and the information of the beam groups indicates a beam group corresponding to at least one of the measurement result of the first beam group or the measurement result of the second beam group.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first device may determine that a power threshold for the first device is satisfied. The first device may transition from a first type of channel state feedback processing to a second type of channel state feedback processing based at least in part on determining that the power threshold for the first device is satisfied.

Certain aspects of the present disclosure generally relate to methods and apparatus for providing channel state feedback. One example method generally includes receiving at least one first pilot signal, and generating a first channel state information (CSI) report based on the at least one first pilot signal. The first CSI report may include a differential phase feedback for each subband (SB) of one or more SBs associated with the at least one first pilot signal. The method may also include transmitting the first CSI report having the differential phase feedback.

A method and apparatus is provided for generating a channel state information report. The method includes receiving reference signals transmitted from a base station. A set of beams are selected based on the received reference signals, each of the beams corresponding to a discrete Fourier transform vector, wherein each of the beams has a corresponding beam index. A set of quantized weighting coefficients are reported, each of the weighting coefficients corresponding to a respective beam index and a respective tap index. The tap index corresponds to a member of a Fourier basis set. At least two subsets of the reported set of weighting coefficients are quantized according to separate quantization procedures.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first device may receive a channel state information (CSI) feedback configuration comprising an indication to save, for a specified time period, a channel state feedback (CSF) that corresponds to a first reference signal carried on a downlink channel. The first device may transmit a differential CSF based at least in part on the CSF and a second reference signal carried on the downlink channel. Numerous other aspects are provided.