Data transmission method, terminal device, and network device

A terminal device for data transmission, comprising:

• a processor configured to determine a reporting type of channel state information (CSI), wherein the reporting type indicates a relationship between CSI of a beam that is currently reported by the terminal device and CSI of a beam that is previously reported by the terminal device in a current reporting period;
• a transceiver, configured to send CSI of N beams to a network device based on the reporting type and a codebook parameter, wherein the codebook parameter indicates a quantity N of the currently reported beams, and N is an integer greater than or equal to 1;
• wherein the processor is further configured to:
• before the CSI of the N beams are sent to the network device based on the reporting type and the codebook parameter, determine the codebook parameter, and
• determine the currently reported N beams based on the reporting type and the codebook parameter;
• and
• wherein the transceiver is further configured to:
• after the codebook parameter is determined, send the codebook parameter to the network device.

A chip for data transmission, comprising:

• a memory;
• at least one processor, configured to read an instruction stored in the memory, wherein when the processor executes the instruction, the chip performs operations comprising:
• determining a reporting type of channel state information (CSI), wherein the reporting type indicates a relationship between CSI of a beam that is currently reported by a terminal device and CSI of a beam that is previously reported by the terminal device in a current reporting period;
• and
• sending CSI of N beams to a network device based on the reporting type and a codebook parameter, wherein the codebook parameter indicates a quantity N of the currently reported beams, and N is an integer greater than or equal to 1, wherein before the sending CSI of N beams to the network device, the operations further comprise:
• determining the codebook parameter,
• sending, after the codebook parameter is determined, the codebook parameter to the network device, and
• determining the currently reported N beams based on the reporting type and the codebook parameter.

A data transmission method, comprising:

• determining, by a network device, a reporting type of channel state information (CSI) of a terminal device, wherein the reporting type indicates a relationship between CSI of a beam that is currently reported by the terminal device and CSI of a beam that is previously reported by the terminal device in a current reporting period;
• receiving, by the network device, CSI of N beams that is from the terminal device, wherein N is an integer greater than or equal to 1;
• and
• determining, by the network device, a current channel state of a downlink channel based on a codebook parameter, the reporting type, and the CSI of the N beams, wherein the codebook parameter is used to indicate a quantity N of beams currently reported by the terminal device;
• wherein before the determining, by the network device, a current channel state of a downlink channel based on a codebook parameter, the reporting type, and the CSI of the N beams, the method further comprises:
• receiving, by the network device, the codebook parameter from the terminal device.

A method device for data transmission, comprising:

• a processor configured to determine a reporting type of channel state information (CSI) of a terminal device, wherein the reporting type indicates a relationship between CSI of a beam that is currently reported by the terminal device and CSI of a beam that is previously reported by the terminal device in a current reporting period;
• a transceiver, configured to receive CSI of N beams that is from the terminal device, wherein N is an integer greater than or equal to 1;
• wherein the processor is further configured to determine a current channel state of a downlink channel based on a codebook parameter, the reporting type, and the CSI of the N beams, wherein the codebook parameter is used to indicate a quantity N of beams currently reported by the terminal device;
• wherein the transceiver is further configured to receive, the codebook parameter from the terminal device.

A chip for data transmission, comprising:

• a memory;
• at least one processor, configured to read an instruction stored in the memory, wherein when the at least one processor executes the instruction, the chip performs operations comprising:
• determining a reporting type of channel state information (CSI) of a terminal device, wherein the reporting type indicates a relationship between CSI of a beam that is currently reported by the terminal device and CSI of a beam that is previously reported by the terminal device in a current reporting period;
• receiving CSI of N beams that is from the terminal device, wherein N is an integer greater than or equal to 1;
• and
• determining a current channel state of a downlink channel based on a codebook parameter, the reporting type, and the CSI of the N beams, wherein the codebook parameter is used to indicate a quantity N of beams currently reported by the terminal device;
• wherein before the determining a current channel state of a downlink channel based on a codebook parameter, the reporting type, and the CSI of the N beams, the operations further comprise:
• receiving the codebook parameter from the terminal device.