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.

Abstract: This application discloses methods and apparatuses for determining precoding vector. One example method includes: determining, by a network apparatus, 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 disclosure provides a precoding method and apparatus, to improve precision of an uplink precoding matrix. The method includes: receiving a plurality of precoded downlink reference signals; measuring the plurality of downlink reference signals and determining an uplink precoding vector corresponding to an uplink data stream. This can reduce signal interference between multiple users, and improve signal quality.

Abstract: The present disclosure discloses a method and apparatus for generating an optical frequency comb. The specific generation method comprises: receiving a pump laser that matches a thermally stable state of a nonlinear optical resonant cavity and causing the pump laser to oscillate in the nonlinear optical resonant cavity, such that a Brillouin gain corresponding to the pump laser coincides with a target longitudinal mode in the nonlinear optical resonant cavity; continuously generating a Brillouin laser at the target longitudinal mode in the case that a pump power of the pump laser exceeds a threshold for generating the Brillouin laser; and generating an optical frequency comb by using the Brillouin laser through a Kerr nonlinear four-wave mixing process. According to the technical solution of the present disclosure, the nonlinear optical resonant cavity with the Brillouin gain can generate an optical frequency comb in its thermally stable region.

Abstract: A transmission control method includes: receiving N pieces of transmission control information; and generating, based on the N pieces of transmission control information, transmission feedback information corresponding to transport blocks respectively scheduled by using the N pieces of transmission control information. Transport blocks can be accurately distinguished based on different effective transmission parameter group fields, and an effective feedback is provided.

Abstract: A search space blind detection method and a communication apparatus. The method includes: a terminal receives indication information that corresponds to a first search space set and that is sent by a network device, where the indication information is used to indicate one or more search space groups, one search space group includes at least two search spaces having an association relationship, and at least one search space in one search space group belongs to the first search space set; and then, the terminal determines, based on the indication information, a quantity of blind detection times corresponding to the first search space set. The quantity of blind detection times corresponding to the first search space set is determined by considering an association relationship between a plurality of search spaces.

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, N?2, and both M and N are integers.

Abstract: Embodiments of the present disclosure provide a precoding matrix indication method, user equipment, and an access device. The precoding matrix indication method includes: generating indication information, where the indication information indicates KNZ - v non-zero weighting coefficients, the KNZ - v non-zero weighting coefficients belong to KNZ non-zero weighting coefficients, v is a quantity of transport layers, the KNZ non-zero weighting coefficients are for constructing a precoding matrix, and the precoding matrix is constructed based on at least the KNZ non-zero weighting coefficients, m spatial domain vectors, and n frequency domain vectors, where the indication information is generated in a first manner when a first preset condition is met, or the indication information is generated in a second manner when a second preset condition is met; and sending the indication information.

Abstract: Embodiments of this application disclose a channel estimation method and apparatus, and relate to the field of communications technologies. One example method include: generating and sending indication information, where the indication information is used to indicate L space-frequency basis vectors for constructing an M×N-dimensional space-frequency vector; the space-frequency vector includes M N-dimensional precoding vectors, each precoding vector is used in one of M frequency bands, and the space-frequency vector is generated by performing a weighted combination on L space-frequency component vectors; each of the L space-frequency component vectors is a vector including M×N elements that are in one of the L space-frequency basis vectors, and each of the L space-frequency basis vectors is an Nf×N-dimensional vector; the space-frequency basis vector is a three-dimensional oversampled (DFT) vector; and L?2, Nf?M?1, N?2, and L, M, N, and Nf are all integers.

Abstract: This application provides an information transmission method, an apparatus, and a device, which are applicable to the communication field, and are used to feed back information obtained based on channel information of different network devices, so as to improve performance gains and reduce performance loss.

Abstract: A channel measurement method and a communication apparatus are provided. The method includes: generating channel information, where the channel information indicates one or more receive beam vectors and one or more weighting coefficients, each of the one or more weighting coefficients corresponds to one receive beam vector, the one or more receive beam vectors and the one or more weighting coefficients corresponding to the one or more receive beam vectors are used to determine a channel of at least one frequency domain unit between a terminal device and a network device, the one or more receive beam vectors are selected from a receive beam vector set, and the receive beam vector set is determined based on a predefined base vector set; and sending the channel information.

Abstract: This application discloses a method for sending a demodulation reference signal, a method for receiving a demodulation reference signal, and a communication apparatus. The method for sending a demodulation reference signal includes: A network device generates a first signal and sends the first signal on a first time-frequency resource, where the first signal is formed by superimposing M DMRS port signals, and delay segmentation locations corresponding to at least two of the M DMRS port signals are different. Because the first signal is formed by superposing the M DMRS port signals, that is, the network device sends a plurality of DMRS port signals on a same time-frequency resource, reference signal overheads can be reduced. The network device sends more DMRS port signals on the same time-frequency resource. In this way, the network device can send more streams without increasing pilot overheads.

Abstract: This disclosure discloses an information indication method and an apparatus, to resolve a problem that indication precision of an uplink precoding matrix is low. The method includes: receiving a downlink reference signal sent by a network device on a first transmission resource; performing channel estimation based on the downlink reference signal, to obtain a downlink equivalent channel corresponding to the first transmission resource; and determining, based on the downlink equivalent channel, to-be-indicated information corresponding to a terminal device, where the to-be-indicated information indicates an uplink precoding matrix used when a first terminal device sends uplink data on the first transmission resource. The downlink equivalent channel is obtained by performing channel estimation based on the downlink reference signal.

Abstract: This application relates to the field of communications technologies and provides a quasi co-location indication method and an apparatus, so that a terminal learns of a quasi co-location relationship between a plurality of antenna ports of a first reference signal resource. The method includes: A terminal receives quasi-co-location indication information, where the quasi-co-location indication information is used to indicate M antenna port groups corresponding to a first reference signal resource, each of the M antenna port groups includes one or more CDM groups of the first reference signal resource, the CDM group includes a plurality of antenna ports, and any two antenna ports in a same antenna port group are in a quasi-co-location relationship. Then, the terminal determines a quasi-co-location relationship between a plurality of antenna ports of the first reference signal resource based on the quasi-co-location indication information.

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.