FIELD: electrical communication engineering.
SUBSTANCE: invention relates to wireless communication. First waveform may be transmitted to a set of user equipment (UEs) over the unlicensed spectrum when available. First waveform may indicate a first time period and a second time period during which the base station has channel access over the unlicensed spectrum. Second waveform may be received from one or more UEs responsive to the first waveform. Each second waveform may be received over the unlicensed spectrum during the first time period and may indicate that the respective UE has channel access over the unlicensed spectrum to receive data from the base station during the second time period.
EFFECT: technical result is enabling clear channel assessment (CCA) at a base station to determine availability of an unlicensed spectrum.
28 cl, 28 dwg
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