A user equipment, UE , for use in a wireless communication system, the UE comprising: a communication module ; and a processor for controlling the communication module , wherein the processor is configured to: attempt to transmit a transmission within a plurality of contiguous transmissions according to a channel access procedure type which is one of at least: - a first channel access procedure type based on a random back-off, - a second channel access procedure type based on channel sensing within a fixed time duration of 25μs, - a third channel access procedure type based on channel sensing within a fixed time duration of 16μs, and - a fourth channel access procedure type without channel sensing; characterized by , when a channel access for the transmission has failed according to the third channel access procedure type with the fixed time duration of 16μs, the processor is configured to attempt to transmit a next transmission within the plurality of contiguous transmissions, after the transmission, according to the second channel access procedure type with the fixed time duration of 25μs. a communication module ; and a processor for controlling the communication module , wherein the processor is configured to: attempt to transmit a transmission within a plurality of contiguous transmissions according to a channel access procedure type which is one of at least: - a first channel access procedure type based on a random back-off, - a second channel access procedure type based on channel sensing within a fixed time duration of 25μs, - a third channel access procedure type based on channel sensing within a fixed time duration of 16μs, and - a fourth channel access procedure type without channel sensing; characterized by , when a channel access for the transmission has failed according to the third channel access procedure type with the fixed time duration of 16μs, the processor is configured to attempt to transmit a next transmission within the plurality of contiguous transmissions, after the transmission, according to the second channel access procedure type with the fixed time duration of 25μs. attempt to transmit a transmission within a plurality of contiguous transmissions according to a channel access procedure type which is one of at least: - a first channel access procedure type based on a random back-off, - a second channel access procedure type based on channel sensing within a fixed time duration of 25μs, - a third channel access procedure type based on channel sensing within a fixed time duration of 16μs, and - a fourth channel access procedure type without channel sensing; - a first channel access procedure type based on a random back-off, - a second channel access procedure type based on channel sensing within a fixed time duration of 25μs, - a third channel access procedure type based on channel sensing within a fixed time duration of 16μs, and - a fourth channel access procedure type without channel sensing; characterized by , when a channel access for the transmission has failed according to the third channel access procedure type with the fixed time duration of 16μs, the processor is configured to attempt to transmit a next transmission within the plurality of contiguous transmissions, after the transmission, according to the second channel access procedure type with the fixed time duration of 25μs. <EOS>