A method of operation of a radio access node for performing a transmit burst to a wireless communication device in an unlicensed spectrum, the transmit burst spanning multiple subframes/slots, the method comprising: preparing a transmission for a first subframe/slot of the transmit burst as a full subframe/slot transmission; performing a Listen-Before-Talk, LBT, procedure for the transmit burst; transmitting the transmit burst in an unlicensed spectrum in response to a successful completion of the LBT procedure; wherein: if the LBT procedure did not successfully complete before a start of the first subframe/slot, reprocessing the transmission for the first subframe/slot of the transmit burst as one or more short Transmit Time Interval sTTI, /mini-slot transmissions in the first subframe/slot and the transmission of the transmit burst starts at one of a plurality of candidate starting points defined in one or more of the multiple subframes/slots of the transmit burst that occurs after successful completion of the LBT procedure for the transmit burst, the plurality of candidate starting points comprising starting points of two or more sTTIs / mini-slots in the first subframe/slot of the transmit burst; and transmitting the transmit burst comprises transmitting two or more sTTI/mini-slot transmissions using sTTI/mini-slot scheduling in the first subframe/slot of the transmit burst. preparing a transmission for a first subframe/slot of the transmit burst as a full subframe/slot transmission; performing a Listen-Before-Talk, LBT, procedure for the transmit burst; transmitting the transmit burst in an unlicensed spectrum in response to a successful completion of the LBT procedure; wherein: if the LBT procedure did not successfully complete before a start of the first subframe/slot, reprocessing the transmission for the first subframe/slot of the transmit burst as one or more short Transmit Time Interval sTTI, /mini-slot transmissions in the first subframe/slot and the transmission of the transmit burst starts at one of a plurality of candidate starting points defined in one or more of the multiple subframes/slots of the transmit burst that occurs after successful completion of the LBT procedure for the transmit burst, the plurality of candidate starting points comprising starting points of two or more sTTIs / mini-slots in the first subframe/slot of the transmit burst; and transmitting the transmit burst comprises transmitting two or more sTTI/mini-slot transmissions using sTTI/mini-slot scheduling in the first subframe/slot of the transmit burst. if the LBT procedure did not successfully complete before a start of the first subframe/slot, reprocessing the transmission for the first subframe/slot of the transmit burst as one or more short Transmit Time Interval sTTI, /mini-slot transmissions in the first subframe/slot and the transmission of the transmit burst starts at one of a plurality of candidate starting points defined in one or more of the multiple subframes/slots of the transmit burst that occurs after successful completion of the LBT procedure for the transmit burst, the plurality of candidate starting points comprising starting points of two or more sTTIs / mini-slots in the first subframe/slot of the transmit burst; and transmitting the transmit burst comprises transmitting two or more sTTI/mini-slot transmissions using sTTI/mini-slot scheduling in the first subframe/slot of the transmit burst.