According to an exemplary embodiment, the second radio frame may be a radio frame of a conventional format. For example, the second radio frame may be but not limited to a CTS-TO-SELF frame or a physical layer frame (for example but not limited to, a NDP frame, a physical layer signaling frame and the like).

According to an exemplary embodiment, a stopping time of the time indicated by the second radio frame for reserving the channel is the same with a stopping time of the first radio frame, or a stopping time of the time indicated by the second radio frame for reserving the channel is the same with a stopping time of the time indicated by the first radio frame for reserving the channel.

According to an exemplary embodiment, receiving identification carried in the second radio frame is broadcast identification or identification of the access point.

In other exemplary embodiments, the receiving identification may be other particular identification.

According to an exemplary embodiment, after the station associated with the access point receives the second radio frame, if it is determined that the time indicated by the second radio frame for reserving a channel is greater than local network allocation vector of the station, the station may update the local network allocation vector using the time indicated by the second radio frame for reserving the channel.

Referring to FIG. 5, an access point A and a station A belong to a basic service set A, an access point B and a station B belong to a basic service set B, and the basic service sets A and B are OBSSs.