A method includes: determining, by an access point based on remaining quantities of electricity and/or location information of all stations in at least one station group in a basic service set, an identifier of a type-1 station in each of the at least one station group and available time window information that corresponds to each type-1 station, and generating a notification message including relay enabling information of the at least one station group, relay enabling information of each station group includes identifiers of at least two type-1 stations in the station group and the available time window information of each type-1 station; and broadcasting, by the access point, the notification message in the basic service set.