Abstract: Example communication methods and apparatus are described. One example method includes receiving a reference signal from a network device by a terminal device. The reference signal has an association relationship with a weight matrix and a channel between the network device and the terminal device, a quantity of rows or columns of the weight matrix is N, and N is a positive integer less than or equal to a quantity of receive ports of the terminal device. The terminal device determines an estimation result of the weight matrix based on the reference signal, where the estimation result of the weight matrix is used by the terminal device to perform signal detection on a data signal received by the terminal device from the network device, or is used by the terminal device to precode a data signal sent by the terminal device to the network device.

Abstract: Embodiments of this application disclose a channel information reporting method and an apparatus. The method includes: determining channel information of a first terminal, where the channel information indicates a channel state of a downlink channel between the first terminal and an access network device; and reporting, to the access network device, first information indicating some or all information in first common information in the channel information of the first terminal and channel information of a second terminal, where the channel information of the second terminal indicates a channel state of a downlink channel between the second terminal and the access network device. According to the method, different terminals can jointly report channel information.

Abstract: A method for operating an access node includes sending a configuration of one or more first channel state information reference signal (CSI-RS) resources and a configuration of one or more sounding reference signal (SRS) resources, generating first control information including an identifier of a SRS resource set that includes the one or more SRS resources precoded by one or more precoders, generating second control information including an identifier of the one or more first CSI-RS resources, wherein the one or more first CSI-RS resources are associated with the identified SRS resource set, wherein the one or more first CSI-RS resources convey a downlink reference signal (RS) used for making measurements, and wherein the one or more precoders are determined in accordance with measurements of the downlink RS, sending the first control information and the second control information, and sending the downlink RS.

Abstract: This disclosure provides example reference signal mapping methods, apparatuses, and media. One example method includes determining a time-frequency unit based on a size of a first frequency domain unit. A resource group in the time-frequency unit is determined based on a first port index, where the resource group corresponds to one port group, and the port group includes one or more ports. A reference signal corresponding to the first port index is mapped to a first resource group in the time-frequency unit in response to determining that a port corresponding to the first port index belongs to a first port group, or the reference signal corresponding to the first port index is mapped to a second resource group in the time-frequency unit in response to determining that a port corresponding to the first port index belongs to a second port group. The reference signal is sent.

Abstract: Example demodulation reference signal (DMRS) port indication methods and apparatus are described. In one example method, a network device determines DMRS port indication information, and sends the DMRS port indication information. The DMRS port indication information is used to indicate a DMRS port set, and the DMRS port set is one of a plurality of DMRS port sets. A first subset of the plurality of DMRS port sets are first DMRS port sets, and DMRS ports in each first DMRS port set belong to a plurality of CDM groups. A second subset of the plurality of DMRS port sets are second DMRS port sets, and at least one DMRS port in each second DMRS port set belongs to a same CDM group.

Abstract: This application provides a communication method and apparatus, so that a terminal device sends uplink pilot signals, the terminal device obtains a first delay information set based on downlink pilot signals from a network device, and the network device jointly considers the first delay information set and the uplink pilot signals to perform uplink channel estimation. The first delay information set may indicate a delay position of a strong path, and uplink channel estimation accuracy can be improved.

Abstract: This application provides an information indication method. The method includes: determining, by a terminal device, that communication on a first downlink resource fails, where the first downlink resource is a resource configured by a network device for the terminal device; and sending, by the terminal device, first indication information to a network device on a first uplink resource, where the first indication information is used to indicate that the communication on the first downlink resource fails, the first uplink resource is a resource used to carry second indication information, and lengths of respective information bits of the second indication information and the first indication information are the same, but status bits of the information bits are different.

Abstract: A neural network adjustment method and apparatus. The neural network adjustment method relates to a first neural network and a second neural network. The method includes: whether a currently used neural network needs to be updated is first determined; and if the currently used neural network needs to be updated, a first device may autonomously complete the update or indicate a second device to complete the update. In other words, a more appropriate neural network may be obtained by updating a neural network in an AI model, to improve precision of information transmission based on the AI model.

Abstract: The present disclosure describes methods, device, system that provide a codebook indication operation. In one example, a codebook indication method includes: receiving by a terminal device, a transmission parameter indication information indicating an index of one codebook subset configuration of three codebook subset configurations in the terminal device from a base station, wherein the three codebook subset configurations in the terminal device are related to fully coherent, partial coherent, and incoherent respectively, and the codebook subset configuration related to fully coherent includes M indexes, the codebook subset configuration related to partial coherent includes N indexes, and the codebook subset configuration related to incoherent includes K indexes, wherein M is an integer larger than N, and N is larger than K; and determining a transmission layer and precoding matrix associated with the index according to the transmission parameter indication information.

Abstract: This application provides a method which includes: receiving, by a terminal, N reference signal groups, where each of the N reference signal groups includes at least two reference signals that are simultaneously received; and sending indication information used to indicate channel state information of at least one reference signal in each of K reference signal groups. Therefore, the terminal can feed back the channel state information of the reference signal in a scenario in which a plurality of reference signals can be simultaneously received, so that a network device selects a beam from a plurality of beams that can be simultaneously sent to send data.

Abstract: A method for operating an access node includes sending a configuration of one or more first channel state information reference signal (CSI-RS) resources and a configuration of one or more sounding reference signal (SRS) resources, generating first control information including an identifier of a SRS resource set that includes the one or more SRS resources precoded by one or more precoders, generating second control information including an identifier of the one or more first CSI-RS resources, wherein the one or more first CSI-RS resources are associated with the identified SRS resource set, wherein the one or more first CSI-RS resources convey a downlink reference signal (RS) used for making measurements, and wherein the one or more precoders are determined in accordance with measurements of the downlink RS, sending the first control information and the second control information, and sending the downlink RS.

Abstract: Embodiments of the present invention disclose an information transmission method, a related device, and a system. The method includes: determining, by a terminal device at a moment n, that a communication failure occurs on a physical downlink control channel (PDCCH) on a first control resource set; and if the terminal device detects, within a first time period after the moment n, that channel quality of the PDCCH on the first control resource set meets a first preset condition, canceling, by the terminal device, sending of communication failure recovery request information, and/or stopping, by the terminal device, timing of a communication failure recovery clock. In the embodiments of the present invention, a communication link can be rapidly recovered after a communication failure occurs.

Abstract: This application provides an enhanced physical downlink control channel transmission method and apparatus. The method includes: in a physical resource block set, separately arranging first resource groups in each physical resource block pair (PRB) pair, where the first resource groups are enhanced resource element groups (eREGs) or REGs, and the physical resource block set includes at least one of the physical resource block pairs; numbering second resource groups according to a correspondence between the first resource groups and the second resource groups in the physical resource block set, where the second resource groups are control channel element eCCE groups or control channel candidates; determining numbers of the second resource groups for transmitting an E-PDCCH; and mapping, according to the determined numbers, the E-PDCCH to the corresponding first resource groups for transmission. The technical solution of this application resolves an E-PDCCH transmission problem.

Abstract: Example link recovery methods and apparatus are described. One example method includes determining a link failure of a first control resource set, where the first control resource set is a control resource set configured by a first master information block MIB. A link failure recovery request is sent, where the link failure recovery request is used to request to recover a communication link of the first control resource set. The first control resource set may be a control resource set (CORESET), a control region, or an enhanced physical downlink control channel (ePDCCH) set defined in a 5G mobile communications system.

Abstract: A signal sending method and a related apparatus are disclosed. In the signal sending method, an access network device obtains a channel information sample, determines M? frequency domain units in M frequency domain units in an (x+T)th time unit based on the channel information sample, and sends one or more measurement pilots to a terminal in the M? frequency domain units. The one or more measurement pilots are used to measure CSI, and the channel information sample includes channel information in an xth time unit to an (x+T?1)th time unit, where M?<M. In the method, the access network device may determine the M? frequency domain units in the M frequency domain units in the (x+T)th time unit to send the one or more measurement pilots, to implement frequency-domain dimension reduction of the one or more measurement pilots.

Abstract: An information transmission method and apparatus. In the method, a terminal device generates a first codeword, where the first codeword is obtained based on a second codeword, a quantity of elements included in the second codeword is greater than a quantity of elements included in the first codeword, the second codeword is associated with a first coefficient set of a downlink channel, and the first coefficient set includes an element included in at least one row vector or column vector of a first coefficient matrix; and then the terminal device feeds back the first codeword to a network device. The terminal device can indicate a position and a numerical value of an element in the first coefficient set by reporting only the first codeword. This manner is simple. In addition, a codeword length of the first codeword is shorter than a codeword length of the second codeword.

Abstract: The present disclosure describes methods, device, system that provide a codebook indication operation. In one example, a codebook indication method includes: receiving by a terminal device, a transmission parameter indication information indicating an index of one codebook subset configuration of three codebook subset configurations in the terminal device from a base station, wherein the three codebook subset configurations in the terminal device are related to fully coherent, partial coherent, and incoherent respectively, and the codebook subset configuration related to fully coherent includes M indexes, the codebook subset configuration related to partial coherent includes N indexes, and the codebook subset configuration related to incoherent includes K indexes, wherein M is an integer larger than N, and N is larger than K; and determining a transmission layer and precoding matrix associated with the index according to the transmission parameter indication information.

Abstract: A downlink control channel transmission method, a receiving network element, and a sending network element are provided, to improve accuracy of beam measurement. A receiving network element obtains target downlink control information (DCI) on a first target control channel candidate in a target control channel candidate set, where the target DCI is DCI of the receiving network element, and the first target control channel candidate includes one or more control channel element groups (CCEGs); the receiving network element determines, based on the target DCI, a quantity of measurement reference signals and a time-frequency resource corresponding to each measurement reference signal; the receiving network element measures each measurement reference signal, to obtain channel quality information corresponding to each measurement reference signal; and the receiving network element reports the channel quality information corresponding to each measurement reference signal to a sending network element.

Abstract: Example receiving parameter indication methods and apparatus are described. One example method includes receiving transmission parameter indication information, where the transmission parameter indication information is used to indicate an index value in an index value set corresponding to a codebook subset configuration. The value of the quantity of transmission layers and a precoding matrix is determined based on the transmission parameter indication information.

Abstract: An uplink power control method comprises: receiving configuration information of a channel state information reference signal (CSI-RS) from a base station, wherein the configuration information of the CSI-RS comprises reference signal port information and reference signal power information; and measuring a path loss for uplink power control based on the configuration information of the CSI-RS. Using the CSI-RS to measure the path loss differs from using a common CRS in that the CSI-RS may be aimed at a specific base station. Therefore, path loss measurement may be performed with respect to a target base station of uplink transmission, enabling the path loss compensation to match the actual path loss, thus improving the performance of uplink power control.