Abstract: This application provides a data transmission method and related 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 includes that 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.

Abstract: This application provides a data transmission method and related 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 includes that 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.

Abstract: Embodiments of the present invention provide a channel selection method and an apparatus. The WiFi network includes a first access point, a second access point, and a third access point. The first access point supports connections on at least two different frequency bands, and the at least two different frequency bands include a first frequency band and a second frequency band. The method includes: directly cascading, by the first access point by using the first frequency band, to the second access point by using the second access point as a higher-level access point; and receiving, by the first access point, a cascading access request of the third access point, and allowing the third access point to directly cascade as a lower-level access point to the first access point by using the second frequency band.