A method for sending an uplink multi-user transmission trigger frame, wherein the method comprises: sending, by an access point , a beacon frame including service identifier mapping information, wherein the service identifier mapping information includes a first bitmap, a bit in the first bitmap indicates whether a corresponding station that is in a sleep state has to-be-receiving downlink data; wherein the bit being set to 1 indicates that the corresponding station has to-be-receiving downlink data; the bit being set to 0 indicates that the corresponding station does not have to-be-receiving downlink data; wherein the beacon frame further includes a second bitmap, and the method further comprises, before the sending of the beacon frame: determining, by the access point from stations that are in a sleep state and have to-be-receiving downlink data, a station that is to be triggered and a station that is not to be triggered; and generating, by the access point , the second bitmap according to the station that is to be triggered and the station that is not to be triggered; wherein each bit in the second bitmap is corresponding to one station in the stations that are in the sleep state and have to-be-receiving downlink data, and is used to indicate whether the station is to be triggered, sending, by the access point , a trigger frame, to at last one station whose bit in the second bitmap indicates that the station is to be triggered, receiving, by the access point feedback information from a station of the at least one station , wherein the feedback information indicates that the station is in an active state. sending, by an access point , a beacon frame including service identifier mapping information, wherein the service identifier mapping information includes a first bitmap, a bit in the first bitmap indicates whether a corresponding station that is in a sleep state has to-be-receiving downlink data; wherein the bit being set to 1 indicates that the corresponding station has to-be-receiving downlink data; the bit being set to 0 indicates that the corresponding station does not have to-be-receiving downlink data; wherein the beacon frame further includes a second bitmap, and the method further comprises, before the sending of the beacon frame: determining, by the access point from stations that are in a sleep state and have to-be-receiving downlink data, a station that is to be triggered and a station that is not to be triggered; and generating, by the access point , the second bitmap according to the station that is to be triggered and the station that is not to be triggered; wherein each bit in the second bitmap is corresponding to one station in the stations that are in the sleep state and have to-be-receiving downlink data, and is used to indicate whether the station is to be triggered, determining, by the access point from stations that are in a sleep state and have to-be-receiving downlink data, a station that is to be triggered and a station that is not to be triggered; and generating, by the access point , the second bitmap according to the station that is to be triggered and the station that is not to be triggered; wherein each bit in the second bitmap is corresponding to one station in the stations that are in the sleep state and have to-be-receiving downlink data, and is used to indicate whether the station is to be triggered, sending, by the access point , a trigger frame, to at last one station whose bit in the second bitmap indicates that the station is to be triggered, receiving, by the access point feedback information from a station of the at least one station , wherein the feedback information indicates that the station is in an active state. <EOS>