A wireless communication system includes a plurality of communication devices. The RF transceiver includes a transmitter and a plurality of receivers, each receiving signal from an associated communication device. A Enhanced Node B (eNB) can communicate with a plurality of communication devices in a Multiple-Input Multiple-Output (MIMO) system. The Node B includes a transmitter and plurality of antenna configured to transmit control information. The wireless communication system may utilize licensed and unlicensed RF spectrum. Long Term Evolution (LTE) is transmitted according to licensed and unlicensed spectrum. The invention deals with swapping between primary carrier and secondary carrier(s) for licensed and unlicensed spectrum.