A method for a user equipment device, UE, to perform a listen-again-after-talk, LAAT, procedure, comprising: the UE, determining, within a transmission occasion, a frequency and a subframe/slot, SS, configuration of modified transmission frames, including determining parameters defining a transmission time for data transmission during an SS, a listening time for listening to an access medium during the SS, and timing for switching between transmitting and receiving within the modified transmission frames, wherein the transmission occasion was reserved via a listen before talk, LBT, procedure on an unlicensed access medium, and wherein each of the modified transmission frames includes an initial transmission period (1010, 1110) for data transmission, a first switching period (1012, 1112) to switch a radio of the UE from a transmission mode of operation to a receiving mode of operation, a listening period (1014, 1112) for listening to an access medium, and a second switching period (1016, 1112) for switching the radio of the UE from the receiving mode of operation to the transmission mode of operation; determining, within the transmission occasion, a timing of the modified transmission frames, including randomizing the timing of modified transmission frames throughout the transmission occasion; detecting, within the transmission occasion, at least one collision during the listening period (1014, 1112) of at least one of the modified transmission frames; and adjusting, for a remainder of the transmission occasion, at least one of the frequency and the SS configuration of the modified transmission frames and LBT parameters based, at least in part, on the detection of the at least one collision. determining, within a transmission occasion, a frequency and a subframe/slot, SS, configuration of modified transmission frames, including determining parameters defining a transmission time for data transmission during an SS, a listening time for listening to an access medium during the SS, and timing for switching between transmitting and receiving within the modified transmission frames, wherein the transmission occasion was reserved via a listen before talk, LBT, procedure on an unlicensed access medium, and wherein each of the modified transmission frames includes an initial transmission period (1010, 1110) for data transmission, a first switching period (1012, 1112) to switch a radio of the UE from a transmission mode of operation to a receiving mode of operation, a listening period (1014, 1112) for listening to an access medium, and a second switching period (1016, 1112) for switching the radio of the UE from the receiving mode of operation to the transmission mode of operation; determining, within the transmission occasion, a timing of the modified transmission frames, including randomizing the timing of modified transmission frames throughout the transmission occasion; detecting, within the transmission occasion, at least one collision during the listening period (1014, 1112) of at least one of the modified transmission frames; and adjusting, for a remainder of the transmission occasion, at least one of the frequency and the SS configuration of the modified transmission frames and LBT parameters based, at least in part, on the detection of the at least one collision.