Abstract: Example quasi co-location information determining methods and apparatus are described. One example method includes determining a quantity X of pieces of quasi co-location QCL information, where X is a positive integer. When it is determined that the quantity X of pieces of QCL information is two, and that DCI corresponding to a current data channel does not indicate QCL information of an antenna port of the data channel, or that an interval between the current data channel and the DCI corresponding to the data channel is less than a threshold, two pieces of default QCL information of the antenna port of the data channel are determined.

Abstract: This application provides a power control method, a terminal, and a network device. The power control method includes: receiving, by a terminal, at least one piece of downlink control information (DCI) sent by at least one network device, where the at least one piece of DCI includes at least two transmit power control commands; and determining, by the terminal, a transmit power on an uplink channel in a same carrier based on the at least two transmit power control commands. According to the power control method in the embodiments of this application, the terminal can determine the transmit power on the uplink channel based on a plurality of transmit power control commands, thereby ensuring efficient and proper power allocation and improving overall system performance.

Abstract: This application provides a transmission precoding matrix indication method and a device. The method includes: determining a bit quantity of a transmission precoding matrix indicator field corresponding to a subband scheduled for uplink based on downlink control information received from a network device, where the bit quantity of the transmission precoding matrix indicator field corresponding to the subband is related to a quantity of subbands corresponding to the resource scheduled for uplink; and further, determining an uplink transmission precoding matrix corresponding to the subband based on the bit quantity of the transmission precoding matrix indicator field corresponding to the subband and the uplink transmission layer quantity. A transmission precoding matrix indicator field can be effectively used, and control channel resource utilization is improved.

Abstract: This application provides a transmission precoding matrix indication method and a device. The method includes: determining a bit quantity of a transmission precoding matrix indicator field corresponding to a subband scheduled for uplink based on downlink control information received from a network device, where the bit quantity of the transmission precoding matrix indicator field corresponding to the subband is related to a quantity of subbands corresponding to the resource scheduled for uplink; and further, determining an uplink transmission precoding matrix corresponding to the subband based on the bit quantity of the transmission precoding matrix indicator field corresponding to the subband and the uplink transmission layer quantity. A transmission precoding matrix indicator field can be effectively used, and control channel resource utilization is improved.

Abstract: Embodiments disclose a communication method and a device. The method includes: processing first information, where a processing process includes ?/2 binary phase shift keying (BPSK) modulation, layer mapping, discrete Fourier transform (DFT) precoding, precoding, and orthogonal frequency division multiplexing (OFDM) waveform generation; and sending the processed first information to a network device. According to embodiments, a peak to average power ratio (PAPR) can be reduced.

Abstract: In accordance with an embodiment, the application discloses a communication method that includes the operations: generating downlink control information DCI; and sending the DCI to a terminal device. The DCI includes indication information used to indicate a single codeword scheduled by using the DCI, or a correspondence between a single codeword scheduled by using the DCI and a first resource. Alternatively, the DCI includes a first number of a hybrid automatic repeat request HARQ process corresponding to a single codeword scheduled by using the DCI, where a quantity of values of the first number is greater than a quantity of values of a second number of an HARQ process used by either one codeword of DCI used to schedule two codewords. In embodiments of the application, a utilization rate of an HARQ buffer can be improved.

Abstract: An information transmission method and a device are provided. The method includes: receiving antenna port grouping information from a terminal device, where the antenna port grouping information includes information about at least one antenna port group of the terminal device and information about at least one antenna port included in each antenna port group; sending indication information to the terminal device based on the antenna port grouping information, where the indication information is used to indicate an antenna port group set used by the terminal device to transmit uplink information at a first moment, the antenna port group set includes at least one first antenna port group, and the first antenna port group is one of antenna port groups indicated by the antenna port grouping information. The terminal device is prevented from continuously sending uplink information on a blocked antenna port.

Abstract: A method for measuring and feeding back channel state information and a device is provided. The method includes: sending, by a first network side device, channel state information (CSI) measurement configuration information to user equipment, where the CSI measurement configuration information includes coordination indication information indicating that the first network side device and at least one second network side device are in a coordination relationship, receiving, by the user equipment, the CSI measurement configuration information from the first network side device, performing measurement based on the CSI measurement configuration information, and feeding back at least one group of CSI to the first network side device based on the measurement configuration information. Accuracy of fed back content and further facilitating scheduling of a base station is improved.

Abstract: A method relating to quasi co-location functionality for wireless communication includes: a radio access network device sending signaling to a terminal device, where the signaling includes a quasi co-location type and at least one set of configuration parameters associated with the quasi co-location type, and the terminal device applying one set of configuration parameters associated with the first quasi co-location type, to learn of at least two quasi co-located antenna ports effective when at least one channel large-scale characteristic parameter associated with the first quasi co-location type is applied.

Abstract: A method for measuring and feeding back channel state information and a device is provided. The method includes: sending, by a first network side device, channel state information (CSI) measurement configuration information to user equipment, where the CSI measurement configuration information includes coordination indication information indicating that the first network side device and at least one second network side device are in a coordination relationship, receiving, by the user equipment, the CSI measurement configuration information from the first network side device, performing measurement based on the CSI measurement configuration information, and feeding back at least one group of CSI to the first network side device based on the measurement configuration information. Accuracy of fed back content and further facilitating scheduling of a base station is improved.

Abstract: This application provides a transmission precoding matrix indication method and a device. The method includes: determining a bit quantity of a transmission precoding matrix indicator field corresponding to a subband scheduled for uplink based on downlink control information received from a network device, where the bit quantity of the transmission precoding matrix indicator field corresponding to the subband is related to a quantity of subbands corresponding to the resource scheduled for uplink; and further, determining an uplink transmission precoding matrix corresponding to the subband based on the bit quantity of the transmission precoding matrix indicator field corresponding to the subband and the uplink transmission layer quantity. A transmission precoding matrix indicator field can be effectively used, and control channel resource utilization is improved.

Abstract: Embodiments of the present invention relate to the communications field, and disclose an information transmission method and device to implement beamforming on an SRS. A specific solution is as follows: A base station configures at least one first resource for a UE, where the first resource is used by the UE to transmit a target channel and/or signal; and the base station transmits first indication information to the UE, where the first indication information is used to indicate a correspondence between the first resource and a beam, or the first indication information is used to indicate a correspondence between the first resource and a second resource. The embodiments of the present invention are used in a beamforming process.

Abstract: A data transmission method is disclosed. The method includes: processing, by a network device, first data to obtain at least one first modulation symbol that is in a first antenna port set, where the first antenna port set includes at least one first antenna port; and sending, by the network device, the at least one first modulation symbol to a terminal device in a first subframe by using a first carrier, where the at least one first modulation symbol is different from at least one second modulation symbol that a network device sends to the terminal device in the first subframe by using the first carrier and that is in a second antenna port set, and the second antenna port set includes at least one second antenna port.

Abstract: An information transmission method and a device are provided. The method includes: receiving antenna port grouping information from a terminal device, where the antenna port grouping information includes information about at least one antenna port group of the terminal device and information about at least one antenna port included in each antenna port group; sending indication information to the terminal device based on the antenna port grouping information, where the indication information is used to indicate an antenna port group set used by the terminal device to transmit uplink information at a first moment, the antenna port group set includes at least one first antenna port group, and the first antenna port group is one of antenna port groups indicated by the antenna port grouping information. The terminal device is prevented from continuously sending uplink information on a blocked antenna port.

Abstract: One example method includes receiving first indication information through a higher layer signaling, the first indication information indicating an available codebook subset, receiving downlink control information, determining a precoding matrix corresponding to a transmission precoding matrix indicator (TPMI) and a transmission rank obtained from the downlink control information, where the precoding matrix belongs to the available codebook subset indicated by the first indication information, precoding a signal based on the determined precoding matrix, and sending the precoded signal to a network device.

Abstract: A CSI-RS measurement feedback method and device are provided to optimize analog and digital precoding. A network device sends S CSI-RSs to a terminal device. Each CSI-RS corresponds to one antenna port number. The terminal device sends M antenna port numbers that correspond to M CSI-RSs and sends a PMI that corresponds to a channel matrix H or the quantization result of a channel matrix H to the network device. The terminal device selects the M antenna port numbers that correspond to the M CSI-RSs from the S antenna port numbers that correspond to the S CSI-RSs, and feeds back the M antenna port numbers to the network device.

Abstract: This application provides a power control method, a terminal, and a network device. The power control method includes: receiving, by a terminal, at least one piece of downlink control information (DCI) sent by at least one network device, where the at least one piece of DCI includes at least two transmit power control commands; and determining, by the terminal, a transmit power on an uplink channel in a same carrier based on the at least two transmit power control commands. According to the power control method in the embodiments of this application, the terminal can determine the transmit power on the uplink channel based on a plurality of transmit power control commands, thereby ensuring efficient and proper power allocation and improving overall system performance.

Abstract: This application provides a transmission precoding matrix indication method and a device. The method includes: determining a bit quantity of a transmission precoding matrix indicator field corresponding to a subband scheduled for uplink based on downlink control information received from a network device, where the bit quantity of the transmission precoding matrix indicator field corresponding to the subband is related to a quantity of subbands corresponding to the resource scheduled for uplink; and further, determining an uplink transmission precoding matrix corresponding to the subband based on the bit quantity of the transmission precoding matrix indicator field corresponding to the subband and the uplink transmission layer quantity. A transmission precoding matrix indicator field can be effectively used, and control channel resource utilization is improved.

Abstract: A communication method and an apparatus is provided. The method includes: determining, by a first network device for a first carrier, association information between a first resource and at least one of a first HARQ entity, a first MAC entity, or a first RLC entity, and sending configuration information to a terminal device, where the configuration information includes the association information between the first resource and the at least one of the first HARQ entity, the first MAC entity, or the first RLC entity; and receiving, by the terminal device, the configuration information, receiving first data, determining that the first data corresponds to the first resource, and determining, based on the configuration information and the first data that corresponds to the first resource, at least one of the first HARQ entity, the first MAC entity, or the first RLC entity corresponding to the first data, HARQ performance is ensured.

Abstract: The present disclosure relates to communications methods, systems, and devices. One example communications method includes when a base station determines that a quasi-co-location (QCL) relationship exists between antenna ports of at least two serving cells in a same serving cell group, sending, by the base station and to user equipment (UE), QCL indication signaling used to indicate that the QCL relationship exists between the antenna ports of the at least two serving cells in the same serving cell group, where the same serving cell group is a group predefined according to a preset rule or is a group obtained after the base station groups serving cells allocated to the UE.