With reference to the eighth aspect, in a first possible implementation of the eighth aspect, the association request message further includes a Media Access Control MAC address of the first STA.
With reference to the first possible implementation of the eighth aspect, in a second possible implementation of the eighth aspect, the association acknowledgement information further includes a MAC address of the second STA.
With reference to any one of the eighth aspect to the second possible implementation, in a third possible implementation of the eighth aspect, a special traffic identifier TID or all 4 bits of a TID in the association acknowledgement information indicates or indicate a quantity of second STAs to which the AP sends acknowledgement requests by using a same piece of association acknowledgement information.
With reference to any one of the eighth aspect to the second possible implementation, in a fourth possible implementation of the eighth aspect, the association acknowledgement information further includes a statistical identifier, and the statistical identifier indicates a quantity of second STAs to which the AP sends acknowledgement requests by using a same piece of association acknowledgement information.
With reference to the fourth possible implementation of the eighth aspect, in a fifth possible implementation of the eighth aspect, the statistical identifier is located after per traffic identifier information in the association acknowledgement information.
With reference to the fourth possible implementation of the eighth aspect, in a sixth possible implementation of the eighth aspect, the statistical identifier occupies a bit reserved in block acknowledgement starting sequence control in the association acknowledgement information.