Wireless Systems and Methods Using Low-Frequency Spectrum for Small Cells and Millimeter Wave Spectrum for Macrocells

摘要

A method of forming a small cell coverage area includes receiving millimeter wave band downlink signals having a large subcarrier spacing and transmitting millimeter wave band uplink signals having the large subcarrier spacing. The method includes transmitting sub-7 GHz band downlink signals having a small subcarrier spacing and receiving sub-7 GHz band uplink signals having the small subcarrier spacing. The small cell coverage area is formed using a sub-7 GHz band spectrum. The method includes transmitting the millimeter wave band downlink signals by a macrocell radio base station, and receiving the millimeter wave band downlink signals by a small cell radio base station. The method includes transmitting the sub-7 GHz band downlink signals by the small cell radio base station, and receiving the sub-7 GHz band downlink signals by a communication device.