Communication method and communications apparatus

A communication method, comprising:

• receiving, by a second communications apparatus, a first message;
• determining, by the second communications apparatus based on the first message, that a first channel learning model is not applicable, wherein the first channel learning model is used to determine first channel information based on target channel information, and a dimension of the first channel information is less than a dimension of the target channel information;
• and
• sending, by the second communications apparatus, first indication information, wherein the first indication information is used to indicate to perform channel learning model training.

A communications apparatus, comprising:

• at least one processor;
• and
• at least one memory coupled to the at least one processor and storing programming instructions for execution by the at least one processor to cause the communications apparatus to:
• determine whether a first channel learning model is applicable, wherein the first channel learning model is used to determine first channel information based on target channel information, and a data amount of the first channel information is less than a data amount of the target channel information;
• and
• send a first message in response to determining that determining that the first channel learning model is not applicable, wherein the first message is used to indicate that the first channel learning model is not applicable.