A system comprising an apparatus for transmitting data, and two apparatuses for receiving the data, wherein the apparatus for transmitting the data comprises: a data transmitter for transmitting the data in a first channel, being an unlicensed spectrum band, by a first transmission, and a transmit information receiver for receiving transmission information in a second channel, being a licensed spectrum band, by a second transmission, wherein the transmission information is control information depending on the first transmission, or the transmission information is channel quality information indicating a channel quality of the first channel, and wherein the second channel is different from the first channel; and wherein each of the two apparatuses for receiving the data comprises: a data receiver for receiving the data from the apparatus for transmitting the data, and a transmit information transmitter for transmitting the transmission information in a second channel to the apparatus for transmitting the data, wherein the two apparatuses for receiving the data are adapted to transmit their transmission information at the same time to the apparatus for transmitting the data, wherein the system is configured to provide interference coordination in a licensed band, wherein the transmit information transmitter of the apparatus for receiving the data is configured to transmit a packet acknowledgement, ACK, signal, indicating that the data has been received, as the transmission information in the second channel, and wherein the transmit information receiver of the apparatus for transmitting the data is configured to receive a packet acknowledgement, ACK, signal, indicating that the data has been received, as the transmission information in the second channel. wherein the apparatus for transmitting the data comprises: a data transmitter for transmitting the data in a first channel, being an unlicensed spectrum band, by a first transmission, and a transmit information receiver for receiving transmission information in a second channel, being a licensed spectrum band, by a second transmission, wherein the transmission information is control information depending on the first transmission, or the transmission information is channel quality information indicating a channel quality of the first channel, and wherein the second channel is different from the first channel; and a data transmitter for transmitting the data in a first channel, being an unlicensed spectrum band, by a first transmission, and a transmit information receiver for receiving transmission information in a second channel, being a licensed spectrum band, by a second transmission, wherein the transmission information is control information depending on the first transmission, or the transmission information is channel quality information indicating a channel quality of the first channel, and wherein the second channel is different from the first channel; and wherein each of the two apparatuses for receiving the data comprises: a data receiver for receiving the data from the apparatus for transmitting the data, and a transmit information transmitter for transmitting the transmission information in a second channel to the apparatus for transmitting the data, a data receiver for receiving the data from the apparatus for transmitting the data, and a transmit information transmitter for transmitting the transmission information in a second channel to the apparatus for transmitting the data, wherein the two apparatuses for receiving the data are adapted to transmit their transmission information at the same time to the apparatus for transmitting the data, wherein the system is configured to provide interference coordination in a licensed band, wherein the transmit information transmitter of the apparatus for receiving the data is configured to transmit a packet acknowledgement, ACK, signal, indicating that the data has been received, as the transmission information in the second channel, and wherein the transmit information receiver of the apparatus for transmitting the data is configured to receive a packet acknowledgement, ACK, signal, indicating that the data has been received, as the transmission information in the second channel.