Channel measurement method and communications apparatus

A channel measurement method, comprising:

• preconfiguring, by a network device, using second indication information sent from the network device to a terminal device, a quantity of domain vectors of at least one domain vector;
• receiving, by the network device, first indication information, wherein 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, wherein the weighting coefficient of each component feature corresponds to the at least one domain vector selected to construct a precoding vector, and wherein the one or more component features and the weighting coefficient of each component feature represent the time-varying feature of a channel using a weighted sum of the one or more domain vectors;
• and
• determining, by the network device based on the first indication information, the one or more component features and the weighting coefficient of each component feature.

A communications apparatus, comprising:

• at least one processor;
• a non-transitory memory configured storing a computer program for execution by the at least one processor, wherein the computer program includes instructions to:
• generate first indication information, wherein 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, wherein the weighting coefficient of each component feature corresponds to at least one domain vector selected to construct a precoding vector, wherein a quantity of the domain vectors of the at least one domain vector is preconfigured by a network device using second indication information sent from the network device to the communications apparatus, and wherein the one or more component features and the weighting coefficient of each component feature represent the time-varying feature of a channel using a weighted sum of the one or more domain vectors;
• and
• send the first indication information.

A communications apparatus, comprising:

• at least one processor;
• a non-transitory memory configured storing a computer program for execution by the at least one processor, wherein the computer program includes instructions to:
• preconfigure, using second indication information sent from the communications apparatus to a terminal device, a quantity of domain vectors of at least one domain vector;
• receive first indication information, wherein 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, wherein the weighting coefficient of each component feature corresponds to the at least one domain vector selected to construct a precoding vector, and wherein the one or more component features and the weighting coefficient of each component feature represent the time-varying feature of a channel using a weighted sum of the one or more domain vectors;
• and
• determine, based on the first indication information, the one or more component features and the weighting coefficient of each component feature.