A method performed by a wireless device to perform a transmission in a frequency spectrum requiring Listen-Before-Talk, LBT, comprising: performing (606, 700) a LBT procedure for a plurality of channels within a transmit bandwidth of the transmit node, the transmit bandwidth being divided into a plurality of bandwidth parts that correspond to the plurality of channels; and transmitting (608, 702) a transmission in a subset of the plurality of bandwidth parts that correspond to a subset of the plurality of channels determined, based on a result of the LBT procedure performed for the plurality of channels, to be available, wherein resources in the plurality of bandwidth parts are logically divided into a plurality of interlaces, wherein the subset of the plurality of channels comprises at least two adjacent channels from the plurality of channels, wherein transmitting the transmission comprises transmitting the transmission in accordance with a transmit scheme that: uses carrier aggregation and/or carrier merging to transmit the transmission on the subset of the plurality of bandwidth parts; and uses resources in one or more guard bands between two or more adjacent bandwidth parts from among the subset of the plurality of bandwidth parts, wherein transmitting (608, 702) the transmission in the subset of the plurality of bandwidth parts comprises: transmitting (608, 702) the transmission using one or more of the plurality of interlaces in at least two adjacent bandwidth parts that correspond to the at least two adjacent channels in accordance with a carrier merging scheme that: merges the at least two adjacent bandwidth parts; and utilizes at least some resources in at least one guard band between the at least two adjacent bandwidth parts; or transmitting (608, 702) the transmission using one or more of the plurality of interlaces in at least two adjacent bandwidth parts that correspond to the at least two adjacent channels in accordance with a carrier aggregation scheme that utilizes at least some resources in at least one guard band between the at least two adjacent bandwidth parts; wherein the at least some resources in the at least one guard band comprising resources that are allocated to at least one of the one or more of the plurality of interlaces on which the transmission is transmitted. performing (606, 700) a LBT procedure for a plurality of channels within a transmit bandwidth of the transmit node, the transmit bandwidth being divided into a plurality of bandwidth parts that correspond to the plurality of channels; and transmitting (608, 702) a transmission in a subset of the plurality of bandwidth parts that correspond to a subset of the plurality of channels determined, based on a result of the LBT procedure performed for the plurality of channels, to be available, wherein resources in the plurality of bandwidth parts are logically divided into a plurality of interlaces, wherein the subset of the plurality of channels comprises at least two adjacent channels from the plurality of channels, wherein transmitting the transmission comprises transmitting the transmission in accordance with a transmit scheme that: uses carrier aggregation and/or carrier merging to transmit the transmission on the subset of the plurality of bandwidth parts; and uses resources in one or more guard bands between two or more adjacent bandwidth parts from among the subset of the plurality of bandwidth parts, uses carrier aggregation and/or carrier merging to transmit the transmission on the subset of the plurality of bandwidth parts; and uses resources in one or more guard bands between two or more adjacent bandwidth parts from among the subset of the plurality of bandwidth parts, wherein transmitting (608, 702) the transmission in the subset of the plurality of bandwidth parts comprises: transmitting (608, 702) the transmission using one or more of the plurality of interlaces in at least two adjacent bandwidth parts that correspond to the at least two adjacent channels in accordance with a carrier merging scheme that: merges the at least two adjacent bandwidth parts; and utilizes at least some resources in at least one guard band between the at least two adjacent bandwidth parts; or transmitting (608, 702) the transmission using one or more of the plurality of interlaces in at least two adjacent bandwidth parts that correspond to the at least two adjacent channels in accordance with a carrier aggregation scheme that utilizes at least some resources in at least one guard band between the at least two adjacent bandwidth parts; wherein the at least some resources in the at least one guard band comprising resources that are allocated to at least one of the one or more of the plurality of interlaces on which the transmission is transmitted. merges the at least two adjacent bandwidth parts; and utilizes at least some resources in at least one guard band between the at least two adjacent bandwidth parts; or transmitting (608, 702) the transmission using one or more of the plurality of interlaces in at least two adjacent bandwidth parts that correspond to the at least two adjacent channels in accordance with a carrier aggregation scheme that utilizes at least some resources in at least one guard band between the at least two adjacent bandwidth parts; wherein the at least some resources in the at least one guard band comprising resources that are allocated to at least one of the one or more of the plurality of interlaces on which the transmission is transmitted.