A wireless transmit/receive unit, WTRU, the WTRU comprising: a receiver, the receiver configured at least to receive downlink control information, DCI, the DCI comprising: an indication of an uplink, UL, grant for an UL transmission, the UL grant indicating one or more subframes; and an indication of one or more parameters associated with a Clear Channel Assessment, CCA, occasion, the CCA occasion corresponding to a time period to conduct one or more CCAs; and a processor, the processor configured at least to: determine a start time for the UL transmission for a subframe of the one or more subframes based at least on the UL grant; identify the CCA occasion based at least on the determined start time for the UL transmission and at least one of the one or more parameters associated with the CCA occasion indicated in the DCI, wherein the CCA occasion is before the determined start time for the UL transmission; perform the one or more CCAs on a channel during the CCA occasion; determine whether the channel is at least one of available or unavailable based on the one or more CCAs; and send the UL transmission at the determined start time via the channel on condition that the channel is determined to be available. a receiver, the receiver configured at least to receive downlink control information, DCI, the DCI comprising: an indication of an uplink, UL, grant for an UL transmission, the UL grant indicating one or more subframes; and an indication of one or more parameters associated with a Clear Channel Assessment, CCA, occasion, the CCA occasion corresponding to a time period to conduct one or more CCAs; and an indication of an uplink, UL, grant for an UL transmission, the UL grant indicating one or more subframes; and an indication of one or more parameters associated with a Clear Channel Assessment, CCA, occasion, the CCA occasion corresponding to a time period to conduct one or more CCAs; and a processor, the processor configured at least to: determine a start time for the UL transmission for a subframe of the one or more subframes based at least on the UL grant; identify the CCA occasion based at least on the determined start time for the UL transmission and at least one of the one or more parameters associated with the CCA occasion indicated in the DCI, wherein the CCA occasion is before the determined start time for the UL transmission; perform the one or more CCAs on a channel during the CCA occasion; determine whether the channel is at least one of available or unavailable based on the one or more CCAs; and send the UL transmission at the determined start time via the channel on condition that the channel is determined to be available. determine a start time for the UL transmission for a subframe of the one or more subframes based at least on the UL grant; identify the CCA occasion based at least on the determined start time for the UL transmission and at least one of the one or more parameters associated with the CCA occasion indicated in the DCI, wherein the CCA occasion is before the determined start time for the UL transmission; perform the one or more CCAs on a channel during the CCA occasion; determine whether the channel is at least one of available or unavailable based on the one or more CCAs; and send the UL transmission at the determined start time via the channel on condition that the channel is determined to be available.