LTE channel access over unlicensed bands

摘要: Methods, systems, and devices are described for wireless communications. In one method, a clear channel assessment (CCA) may be performed at base station to determine availability of an unlicensed spectrum. A first waveform transmitted set user equipments (UEs) over the spectrum when available. The indicate time period second during which has access received from or more UEs responsive waveform. Each that respective UE receive data period.