Data transmission method, apparatus and system for

Embodiment of the present invention provides a data transmission method, apparatus and system. The method comprising: a reception history site stock RTS frame comprises a main channel, including transmission channel, the transmission frame to indicate the history of the new station sites and the stock, so that inventory history station according to the instruction frame including a primary channel comprising a channel transmission data and transmits data in accordance with the new addition to the site indicated on the secondary channel frame historical stock unoccupied site. Embodiment of the present invention is a data transmission method, apparatus and system provided to achieve the OFDMA uplink data transmission in the compatibility mode, the waste of bandwidth to solve the problem caused when the history data transmission site inventory.