Abstract: This application discloses a data transmission solution. A terminal device generates channel state information and data for transmission in a data channel. The transmit power of the data channel is determined based on the number of bits used to transmit the data and the number of bits used to transmit the channel state information. The solution of this application reduces bit error probability and improves data decoding accuracy.

Abstract: An interference power measurement method and a device are provided. The method includes: receiving, by a terminal, first signaling that carries first indication information, where the first indication information is used to indicate n first channel state information-reference signal CSI RS resources, and a jth first CSI RS resource is associated with a power parameter Pc,j; and sending, by the terminal, a channel quality indicator CQI, where the CQI is determined based on a total interference power. The total interference power is a linear weighting result of an interference power measured on each of the n first CSI RS resources and an interference power I0 measured on a zero power CSI RS resource. A weighting coefficient of an interference power Ij measured on the jth first CSI RS resource is a function of the power parameter Pc,j, and a weighting coefficient of I0 is a function of 1 - ? j = 1 n ? P c , j .

Abstract: Embodiments of this application provide a precoding matrix indication method, a communications apparatus, and a storage medium. A precoding matrix of each of K frequency-domain units satisfies W=W1×W2, and elements in W2 in the K frequency-domain units are represented by P elements that are relatively few. A terminal device reports third indication information, where the third indication information includes first indication information and the second indication information, and the first indication information and the second indication information are independently encoded. The first indication information is used to indicate the P elements, and the second indication information is used to indicate P. Therefore, the terminal device can adjust a quantity of information bits of the second indication information based on a channel condition change, thereby improving precoding matrix reporting efficiency.

Abstract: Embodiments of the present invention disclose a communication method and a device. Configuration information indicating one or more spatial domain beam basis vector groups and Q thresholds is received from a network device, where the Q thresholds correspond one-to-one to spatial domain beam basis vectors in the one or more spatial domain beam basis vector groups. L spatial domain beam basis vectors are selected from a spatial domain beam basis vector group set. K frequency domain basis vectors are selected from a frequency domain basis vector set for each of the L spatial domain beam basis vectors.

Abstract: One example method for measuring a channel state information reference signal includes receiving, from a network device, a partial channel state information reference signal resource sets selected from a plurality of channel state information reference signal resource sets and indication information indicating one or more resource sets for channel measurement, which are from the partial channel state information reference signal resource sets, and performing channel measurement by using the one of the one or more resource sets for channel measurement indicated by the indication information.

Abstract: This application provides a data transmission method, terminal device, and network device. The method includes: sending, by a terminal device, at least one precoded reference signal on at least one reference signal resource corresponding to a first PRG, where different precoding matrixes are used for different reference signals, and the first PRG is a PRG used to transmit a reference signal; receiving, by the terminal device, resource indication information, where the resource indication information indicates a reference signal resource that is corresponding to a second PRG and that is in the at least one reference signal resource, and the second PRG is a PRG used to transmit a physical uplink shared channel (PUSCH); and sending, by the terminal device, a precoded PUSCH on the second PRG based on the resource indication information, where a precoding matrix used for the PUSCH is a precoding matrix used for a reference signal sent on the reference signal resource corresponding to the second PRG.

Abstract: Embodiments of this application provide an SRS sending method, an SRS receiving method, and a device. A manner of determining an antenna used to send an SRS is provided. In addition, a case in which one subframe includes a plurality of symbols is considered by using a quantity of first time units that are used by a terminal device to send an SRS in one uplink subframe and a case in which one antenna is enabled to implement continuous sending as much as possible is also considered by using a quantity of first time units that are consecutively used to send the SRS in one subframe by using a same antenna.

Abstract: The present disclosure relates to reference symbol indication methods, devices, and systems. One example method includes receiving, by a user equipment, a target parameter including a target reference symbol indication sent by a base station, determining a target transmission mode and target reference symbol information based on the target parameter and a preset reference symbol mapping relationship, generating a target reference symbol based on the target reference symbol information, and demodulating data based on the target reference symbol and the target transmission mode, where the preset reference symbol mapping relationship includes a mapping relationship among a reference symbol indication, reference symbol information, and a transmission mode.

Abstract: This application provides a channel state information transmission method, an access network device, and a terminal device. The method includes: receiving, by an access network device, CSI reported by a terminal device, where the CSI includes a first PMI and a second PMI; and determining, by the access network device based on the first PMI and the second PMI, a precoding matrix W whose rank is greater than or equal to 2, where W meets W=W1×W2, and the second PMI is used to indicate some column vectors in W2. According to the method in the embodiment, overheads of feeding back the CSI by the terminal device are effectively reduced.

Abstract: This application discloses a precoding matrix index (PMI) reporting method, and related communications apparatus and medium. The method includes: determining an rank indicator (RI) and a PMI, where the PMI is used to determine R precoding matrices W1, . . . , WR. An rth precoding matrix Wr in the R precoding matrices satisfies Wr=W1×W2,r, where an lth row of W2,r is obtained by performing DFT transform on an lth row of a matrix V2,r, and R is indicated by the RI. The PMI includes first indication information and second indication information. The first indication information includes location index information. The location index information is used to indicate Km,r element locations tr,m,1, . . . , ?{1, . . . , T} on an mth row of V2,r. The second indication information is used to indicate Km,r complex coefficients at the element locations tr,m,1, . . . , on the mth row of V2,r. V2,r is determined based on the Km,r element locations and the Km,r complex coefficients.

Abstract: Embodiments of this application provide a precoding matrix indication method, a communications apparatus, and a storage medium. A precoding matrix of each of K frequency-domain units satisfies W=W1×W2, and elements in W2 in the K frequency-domain units are represented by P elements that are relatively few. A terminal device reports third indication information, where the third indication information includes first indication information and the second indication information, and the first indication information and the second indication information are independently encoded. The first indication information is used to indicate the P elements, and the second indication information is used to indicate P. Therefore, the terminal device can adjust a quantity of information bits of the second indication information based on a channel condition change, thereby improving precoding matrix reporting efficiency.

Abstract: A bit field indication manner is provided. A first field is determined, where the first field includes T1 bits, at least one of the T1 bits indicates at least two elements {bi0, bi1, . . . , bik} in a set B, the at least one bit further indicates at least one element {?j0, ?j1, . . . , ?jh} in a set ?, and at least one element in {bi0, bi1, . . . , bik} and at least one element in {?j0, ?j1, . . . , ?jh} are used to form a preceding matrix, where the set B={b0, b1, L, bT2?1}, an element in the set B is a vector with a length of N/4, the set ?={?0, ?1, . . . , ?S?1}, an element in ? is a complex number of a unit amplitude.

Abstract: The present disclosure describes information reporting methods and related apparatuses used to control channel state information reporting between network devices. One example method includes receiving, by a second network device, control information sent by a first network device. The control information can include a trigger signal and a channel state information type, and the trigger signal can be used to trigger the second network device to report target channel state information to the first network device. The second network device determines the target channel state information based on the channel state information type, and then reports the target channel state information to the first network device based on the trigger signal and the channel state information type.

Abstract: This application provides a channel state information reporting method and apparatus. The method includes: A terminal device receives M pieces of downlink control information, where first downlink control information in the M pieces of downlink control information indicates a first channel state information configuration, the first channel state information configuration is associated with a first channel state information interference measurement CSI-IM resource group, and the first CSI-IM resource group includes N1 CSI-IM resources, where M and N1 are positive integers, and N1 is greater than 1; and the terminal device measures a target CSI-IM resource, and reports channel state information, where the target CSI-IM resource is determined by the terminal device from the N1 CSI-IM resources based on M, and a quantity of target CSI-IM resources is less than N1.

Abstract: A channel state information reporting method and apparatus are described. The method can include a terminal device obtaining first indication information and sending the first indication information to a network device. The network device receives the first indication information, where the first indication information indicates a differential value between channel state information of a first antenna port set and channel state information of a second antenna port set. The first antenna port set includes x antenna ports of the terminal device, the second antenna port set includes m antenna ports of the terminal device, and the first antenna port set is different from the second antenna port set. The channel state information reporting method and apparatus in embodiments of this application help improve accuracy of channel state information obtained by a network device, and improve data transmission performance.

Abstract: Embodiments provide a data transmission method, a network device, and a terminal device. For achieving this, indication signaling indicating data transmission of one transport block can be sent. The indication signaling carries a status value indicating a quantity of coding block groups in the transport block. The status value further indicates at least one coding block group in the data transmission. The status value is represented by using a maximum of K+1 bits, and K is a maximum value of the quantity of coding block groups that can be included in the transport block. In various embodiments, a network device jointly indicates, by using the status value, the quantity of coding block groups in the transport block and the at least one coding block group included in the data transmission, so that a quantity of bits occupied by the indication signaling is reduced, thereby reducing signaling overheads.

Abstract: This application discloses a precoding matrix index (PMI) reporting method, and related communications apparatus and medium. The method includes: determining an rank indicator (RI) and a PMI, where the PMI is used to determine R precoding matrices W1, . . . , WR. An rth precoding matrix Wr in the R precoding matrices satisfies Wr×W1×W2, r, where an lth row of W2, r is obtained by performing DFT transform on an lth row of a matrix V2,rand R is indicated by the RI. The PMI includes first indication information and second indication information. The first indication information includes location index information. The location index information is used to indicate Km,r element locations tr,m,1, . . . , tr,m,Kmj?{1, . . . , T} on an mth row of V2,r. The second indication information is used to indicate Km,r complex coefficients ar,m,tr,mj at the element locations tr,m,1, . . . , tr,m,kmj on the mth row of V2,r. V2,r is determined based on the Km,r element locations and the Km,r complex coefficients.

Abstract: A reference signal sending method includes the following. A network device sends reference signals of N antenna ports and downlink data to a terminal device, where the reference signals of the N antenna ports include cell common reference signals of N1 antenna ports and reference signals that are of N2 antenna ports and that are specific to the terminal device. After receiving the reference signals of the N antenna ports and the downlink data, the terminal device detects the downlink data based on the reference signals.

Abstract: A method for transmitting a sounding reference signal and a terminal device are provided. The method includes: receiving, by the terminal device, SRS configuration information from a network device; determining, based on one or more of an SRS bandwidth configuration parameter, a sequence number nSRS of a quantity of SRS transmissions, a quantity ? of antenna ports, and the received SRS configuration information, an index ?(nSRS) corresponding to an antenna port used to transmit an SRS; selecting the antenna port with the index of ?(nSRS) from indexes corresponding to the ? antenna ports; and transmitting the SRS through the antenna port with the index of ?(nSRS) during an nSRSth SRS transmission. nSRS is an integer greater than or equal to 0, ? is a positive integer greater than or equal to 4, and a symbol * indicates a multiplication operation.

Abstract: This application provides sounding reference signal transmission methods and apparatuses. One method comprises: determining, by a terminal device, that a sounding reference signal (SRS) to be transmitted is an nSRSth transmission of a plurality of SRS?transmissions, wherein nSRS is a non-negative integer; selecting, by a terminal device, an antenna group of ? antenna groups to transmit the sounding reference signal (SRS) based on ? and nSRS, such that when sending the SRS for 2? times, the SRS is sent through each of the ? antenna groups at least once, wherein ? is a positive integer greater than or equal to 3; and sending, by the terminal device during the nSRSth transmission, the SRS through antenna ports comprised in the selected antenna group.