Communication method and communications device thereof

A database network element, comprising:

• a processor, configured to obtain training data, wherein the training data comprises service transmission data and network data;
• a transmitter, configured to send the training data to a data analytics network element;
• and
• a receiver, configured to receive first information from the data analytics network element, wherein the first information comprises a first feature index list set, a service identifier corresponding to each feature index list in the first feature index list set, and a data network name (DNN) corresponding to the service identifier.

A data analytics network element, comprising:

• a receiver, configured to receive training data from a database network element, wherein the training data comprises service transmission data and network data;
• a processor, configured to determine first information based on the training data, wherein the first information comprises a first feature index list set, a service identifier corresponding to each feature index list in the first feature index list set, and a data network name (DNN) corresponding to the service identifier;
• and
• a transmitter configured to send the first information to the database network element.