Abstract: Embodiments of this application provide a channel information reporting method and an apparatus. The method includes: A communication apparatus measures a plurality of reference signals from a plurality of radio access network devices, and determines first delay information and first channel information based on the plurality of reference signals; performs delay compensation on the first channel information based on the first delay information, to determine second channel information; determines a precoding matrix indicator (PMI) based on the second channel information, where the PMI indicates the second channel information; and reports the first delay information and the PMI.

Abstract: Example communication methods and communications apparatus are described. One example method include: receiving downlink control information (DCI), where the DCI indicates N demodulation reference signal (DMRS) ports. The N DMRS ports correspond to each of M physical downlink shared channel (PDSCH) transmission units, at least two of the M PDSCH transmission units correspond to different transmission configuration indicator (TCI)-states, N is an integer greater than or equal to 1, and M are integers greater than or equal to 2. M PDSCHs are received based on the DCI.

Abstract: This application provides an information transmission method and apparatus. The method includes: receiving, by a terminal device, a plurality of downlink data channels, where the plurality of downlink data channels are scheduled through a plurality of downlink control channels; determining, by the terminal device based on the plurality of downlink data channels, one or more pieces of feedback information corresponding to at least two downlink data channels; and sending, by the terminal device, the one or more pieces of feedback information through a same uplink control channel.

Abstract: Embodiments of this application provide a method and an apparatus for triggering channel state information (CSI) reporting. The method includes: A terminal device receives downlink control information sent by a network device. The downlink control information is for triggering N pieces of CSI reporting. The N pieces of CSI reporting are in a one-to-one correspondence with N pieces of CSI reporting configuration information indicated by the downlink control information. The N pieces of CSI reporting configuration information are different from each other, where N is a positive integer greater than 1. The terminal device performs the N pieces of CSI reporting based on the N pieces of CSI reporting configuration information. In the communication method provided in this application, one piece of downlink control information simultaneously triggers a plurality of different pieces of CSI reporting.

Abstract: This application provides a precoding matrix indicating and determining method and a communications apparatus. The method includes: generating, by a terminal device, first indication information, and sending the first indication information to a network device, where the first indication information indicates a spatial domain vector, a frequency domain vector, and a weighting coefficient that are used to construct a precoding matrix. When a value of a rank Z is greater than 2, Z transport layers include at least one first-type transport layer, and a maximum quantity M1 of frequency domain vectors reported for the first-type transport layer satisfies: M 1 = ? p 1 × N 3 R ? , wherein p1 is a preconfigured coefficient for determining the maximum quantity of frequency domain vectors reported for the first-type transport layer, 1?p1?0, R is a preconfigured value, N3 is a length of a frequency domain vector, Z>2, and R, N3, and Z are all positive integers.

Abstract: This application provides a method for reporting a terminal device capability and a communications apparatus. The method includes: The terminal device generates first indication information and sends the first indication information to a network device. The first indication information is used to indicate one or more frequency domain parameters and one or more of the following capability parameters associated with each frequency domain parameter: a port quantity, a spatial domain parameter, a reference signal resource quantity, and a total port quantity. The frequency domain parameter is used to indicate a maximum quantity of frequency domain units that can be supported by the terminal device. The frequency domain unit is a frequency domain unit based on which the terminal device feeds back a PMI. Each capability parameter group may be used to indicate one combination of a plurality of parameters that can be supported by the terminal device.

Abstract: This application provides a data transmission method and a communication apparatus, to improve data transmission reliability. The method includes: receiving downlink control information (DCI); determining a plurality of pieces of quasi-co-location (QCL) information based on the DCI; and receiving downlink data based on the plurality of pieces of QCL information. The plurality of pieces of QCL information correspond to a plurality of time domain units, each time domain unit corresponds to at least one piece of QCL information, and at least two of the plurality of pieces of QCL information are different, that is, the downlink data is from at least two network devices.

Abstract: A channel measurement method and a communications apparatus, the method including generating, by a terminal device, first indication information, where the first indication information indicates one or more component features of a time-varying feature, and further indicates a weighting coefficient of each component feature of the one or more component features, and the one or more component features and the weighting coefficient of each component feature represent the time-varying feature of a channel, and sending, by the terminal device, the first indication information to a network device.

Abstract: Embodiments of this application disclose a channel estimation method and apparatus, and relate to the field of communications technologies, to help reduce indication overheads. The method may include: generating and sending indication information, where the indication information is used to indicate M N-dimensional precoding vectors, each precoding vector is applied to one of M frequency bands, the M N-dimensional precoding vectors form a space-frequency matrix, and the space-frequency matrix is generated by performing weighted combination on a plurality of space-frequency component matrices, where the space-frequency matrix is an M×N-dimensional space-frequency vector or an X×Y space-frequency matrix, X and Y are one and the other of M and N, M?1, N24 2, and both M and N are integers.

Abstract: A terminal device generates at least two pieces of HARQ-ACK information based on a plurality of received PDSCHs, and sends the at least two pieces of HARQ-ACK information to a network device. Each piece of HARQ-ACK information includes an ACK or a NACK fed back for one or more PDSCHs. When a piece of HARQ-ACK information includes ACKs or NACKs fed back for a plurality of PDSCHs, at least one of the following of the plurality of PDSCHs corresponding to the HARQ-ACK information is the same: port groups to which ports of DMRSs used to demodulate the PDSCHs belong, identifiers of enabled transport blocks carried in the plurality of PDSCHs, and PDCCH configurations of a plurality of PDCCHs used to schedule the plurality of PDSCHs.

Abstract: Embodiments of this application provide a downlink control information transmission method in which after receiving one piece of downlink control information (DCI), the terminal device learns whether blind detection of DCI needs to be continued. The method includes: A terminal device receives first DCI, where the first DCI includes first indication information, and the first indication information is used to indicate a first antenna port. The terminal device determines, based on the first antenna port and antenna port configuration information, whether second DCI exists. The configuration information may include an index of a CDM group to which each of a plurality of antenna ports belongs and a maximum quantity of CDM groups that is supported by the terminal device. Alternatively the configuration information may include one or more antenna port groups, and each of the one or more antenna port groups includes one or more antenna ports.

Abstract: This application provides a UCI sending and receiving method and a communications apparatus. In the method, an association relationship between a PUCCH and a PUSCH is established, so that when resources of the PUSCH and the PUCCH overlap, a terminal device can determine UCI on which PUCCHs can be transmitted by multiplexing the resource of the PUSCH. A network device may receive the UCI on the PUSCH. Because the network device may know in advance which PUCCHs and PUSCHs are sent to the network device, the network device can demodulate and decode a signal on the received PUSCHs, to successfully obtain UCI. The network device can make a proper decision based on the UCI.

Abstract: This application provides a data sending and receiving method. The method includes: receiving, by a terminal device, a first PDCCH and a second PDCCH, where the first PDCCH is used to schedule a first PDSCH, and the first PDSCH is used to transmit first data; determining, based on the first PDCCH and the second PDCCH, a first resource used to transmit the first data, where the first resource is a part or all of a resource of the first PDSCH; and receiving, by the terminal device, the first data from a network device on the first resource. The first resource is determined with reference to the first PDCCH and the second PDCCH, to avoid a problem that receiving performance of the first PDSCH and the second PDCCH may deteriorate when a resource of the second PDCCH overlaps the resource of the first PDSCH.

Abstract: A resource scheduling method and a communication apparatus. In the method, a terminal device receives first indication information for determining a quantity of layers to be scheduled corresponding to each frequency domain unit in a plurality of frequency domain units, or for determining a quantity of layers to be scheduled corresponding to each frequency domain unit group in one or more frequency domain unit groups, where one frequency domain unit group includes one or more frequency domain units, one frequency domain unit includes one or more frequency domain resources with a same quantity of layers to be scheduled; and determines, based on the first indication information, a quantity of layers to be scheduled that are on frequency domain resources for data transmission, where at least two of the frequency domain resources for data transmission have different quantities of layers to be scheduled.

Abstract: Embodiments of this application provide a channel estimation method and apparatus, and relate to the field of communications technologies, to help reduce indication overheads. The method includes: generating and sending indication information, wherein the indication information is used to indicate M N-dimensional precoding vectors, each precoding vector is applied to one of M frequency bands, the M N-dimensional precoding vectors form a space-frequency matrix, and the space-frequency matrix is generated by performing weighted combination on a plurality of space-frequency component matrices, wherein the space-frequency matrix is an M×N-dimensional space-frequency vector or an X×Y space-frequency matrix, X and Y are one and the other of M and N, M?1, N?2, and both M and N are integers.

Abstract: This application provides a method for indicating a precoding vector, a method for determining a precoding vector, and a communications apparatus. The method includes: generating and sending, by a terminal device, first indication information; and determining, by a network device, a precoding vector of one or more frequency domain units based on the first indication information. The first indication information is used to indicate L1 beam vectors in a beam vector set, K1 frequency domain vectors in a frequency domain vector set, and T1 space-frequency component matrices. A weighted sum of the T1 space-frequency component matrices is used to determine a precoding vector of each frequency domain unit. The T1 space-frequency component matrices are selected from M1 space-frequency component matrices corresponding to the L1 beam vectors and the K1 frequency domain vectors, each space-frequency component matrix is uniquely determined by one beam vector and one frequency domain vector.

Abstract: This application discloses communication methods and communication apparatuses. In an implementation, a communication method includes: receiving first information that indicates first group configuration information and second group configuration information, the first group configuration information indicates a correspondence between P reference signal ports and Z layers, and the second group configuration information indicates a correspondence between N frequency domain base vectors and the Z layers; and sending a precoding matrix indicator (PMI) corresponding to the Z layers, where the PMI is determined based on the first information.

Abstract: This application provides a channel measurement configuration method and a communications apparatus. The method includes: receiving, by a terminal device, a measurement configuration, where the measurement configuration includes a plurality of resource settings, and the plurality of resource settings include a plurality of resource settings for channel measurement and a plurality of resource settings for interference measurement; receiving, by the terminal device, channel state information reference signals CSI-RSs on resources configured in the plurality of resource settings; and generating, by the terminal device, a CSI group based on the CSI-RSs, where the CSI group includes one or more pieces of CSI. In embodiments of this application, a plurality of resource settings for channel measurement and a plurality of resource settings for interference measurement are associated in one report setting.

Abstract: This disclosure provides methods and apparatuses for generating precoding vectors. One method includes: receiving a channel state information (CSI) report, wherein the CSI report indicates a quantity of space-frequency vector pairs to be reported for a quantity of R transport layers, wherein a size of an overhead for indicating the quantity of the space-frequency vector pairs is same when the quantity of R is greater than or equal to 2, wherein each of the space-frequency vector pairs comprises one spatial domain vector and one frequency domain vector, and wherein for each of the R transport layers, one or more frequency domain units associated with the transport layer correspond to one or more precoding vectors, and determining the quantity of space-frequency vector pairs according to the CSI report.