US Patent 10143037 Millimeter wave wireless systems using licensed and unlicensed frequency spectrum

A method of wireless communication includes transmitting in a downlink direction on a licensed millimeter wave band, by a radio base station, a first millimeter wave band signal at high transmit equivalent isotropically radiated power (EIRP) using a multiple input multiple output transmit antenna array. The method includes receiving by a communications device the first millimeter wave band signal. The method includes transmitting in an uplink direction on an unlicensed millimeter wave band, by the communications device, a second millimeter wave band signal at low transmit equivalent isotropically radiated power (EIRP) using a multiple input multiple output transmit antenna array. The method includes receiving on the unlicensed millimeter wave band, by the radio base station, the second millimeter wave band signal at a high receive gain using a multiple input multiple output receive antenna array.