A station, wherein the station is in a basic service set, BSS, comprising an access point, AP, and multiple stations and the station comprises: a sending unit configured: when the station obtains, by means of listening, a second request to send sent by another station acting as a master station, and the station satisfies the following conditions: the station has buffer data to be transmitted; the station is in a same basic service set, BSS, as the other station sending the second request to send, and a power of a signal received from the other station sending the second request to send and obtaining at least one channel by means of contention is greater than a preset threshold, to send a third request to send to the AP, and a receiving unit, configured to receive response information sent by the AP, wherein the response information is used to schedule the station to transmit data on a specified sub-channel; wherein a master station is a station which after obtaining at least one channel by means of contention sends the second request to send and wherein the second request to send comprises buffer data information and information about a BSS to which the master station sending the second request to send belongs, wherein the BSS information is used to identify, by the station, whether the station is in the same BSS as the master station sending the second request to send, and wherein the buffer data information of the second request to send comprises a length and a type of data needing to be sent by the master station sending the second request to send and wherein the buffer data information of the third request to send comprises a length and a type of data needing to be sent by the station sending the third request to send. when the station obtains, by means of listening, a second request to send sent by another station acting as a master station, and the station satisfies the following conditions: the station has buffer data to be transmitted; the station is in a same basic service set, BSS, as the other station sending the second request to send, and a power of a signal received from the other station sending the second request to send and obtaining at least one channel by means of contention is greater than a preset threshold, to send a third request to send to the AP, and a receiving unit, configured to receive response information sent by the AP, wherein the response information is used to schedule the station to transmit data on a specified sub-channel; wherein a master station is a station which after obtaining at least one channel by means of contention sends the second request to send and wherein the second request to send comprises buffer data information and information about a BSS to which the master station sending the second request to send belongs, wherein the BSS information is used to identify, by the station, whether the station is in the same BSS as the master station sending the second request to send, and wherein the buffer data information of the second request to send comprises a length and a type of data needing to be sent by the master station sending the second request to send and wherein the buffer data information of the third request to send comprises a length and a type of data needing to be sent by the station sending the third request to send.