A method of delivering downlink control information associated with downlink data transmission on an unlicensed channel includes, transmitting downlink control information to a user equipment (UE) on a second channel without knowing when the unlicensed channel is available for transmission, wherein the downlink control information corresponds to a later transmission of data on the unlicensed channel if the unlicensed channel is available; and transmitting the data to the UE on the unlicensed channel according to the downlink control information, if the unlicensed channel is available for transmission.