DATA TRANSMISSION METHOD AND DEVICE

This application provides a data transmission method and an apparatus. The data transmission method is applied to a communications system. An access point in the communications system includes a first communications apparatus and a second communications apparatus, and a station in the communications system includes a third communications apparatus and a fourth communications apparatus. The data transmission method may include: After failing to send a first data frame to the third communications apparatus through a first channel, the first communications apparatus retransmits the first data frame, and sends a same second data frame to the second communications apparatus. The first communications apparatus receives a first notification message sent by the second communications apparatus. The first communications apparatus stops, in response to the first notification message, sending the first data frame. In this application, the same data frame is sent through two channels between the access point and the station, so that an anti-interference capability of wireless transmission is enhanced, a latency and a packet loss are reduced, and then reliability and real-time performance of data transmission on a wireless link are improved.