Data transmission method and network device

A data transmission network device, wherein the network device comprises:

• a processor and a memory storing instructions executable by the processor such when executed, cause the network device to:
• send a first training frame to each of at least two terminals, and receive first feedback information that is sent by each terminal and that comprises a first antenna mode of the terminal, wherein the first antenna mode of each terminal comprises a beam used when the network device sends the first training frame and a beam used when the terminal receives the first training frame;
• categorize the at least two terminals into M groups based on the first antenna mode of each terminal, wherein each of the M groups comprises at least two terminals, and M is a positive integer, wherein
• send a second training frame to each terminal in each group, and receive second feedback information that is sent by each terminal in each group and that comprises a second antenna mode of the terminal, wherein the second antenna mode of each terminal comprises a beam used when the network device sends the second training frame and a beam used when the terminal receives the second training frame;
• and
• regroup the terminals in each group based on the second antenna mode of each terminal in the group, and determine an antenna mode of each group obtained through the regrouping, wherein the antenna mode of each group comprises a beam used when the network device sends downlink data to a terminal in the group and a beam used when the terminal in the group receives the downlink data;
• and
• send first downlink data to each terminal based on the antenna mode of each group, wherein the first downlink data comprises a superposition of first data of all the terminals in the group.