A user equipment for being scheduled with uplink radio resources, wherein at least one unlicensed cell is configured for communication between the user equipment and a radio base station that is responsible for scheduling uplink radio resources on the unlicensed cell, wherein the user equipment comprises: a receiver, which in operation, is configured to receive from the radio base station a first-stage uplink resource scheduling message, indicating uplink radio resources usable by the user equipment to perform an uplink transmission via the unlicensed cell, a processor, which in operation, is configured to determine whether the first-stage uplink resource scheduling message is valid or not, which comprises determining that the first-stage uplink resource scheduling message is valid in case one or more bits of one or more data fields in the first-stage uplink resource scheduling message are set to respectively predetermined values, the receiver, which in operation, is configured to receive from the radio base station a second-stage uplink resource scheduling message which is related to the first-stage uplink resource scheduling message, the processor, which in operation, is configured to determine when receiving the second-stage uplink resource scheduling message, that an uplink transmission is scheduled in case the processor determined that the first-stage uplink resource scheduling message is valid, and a transmitter, which in operation, and in case the processor determined that an uplink transmission is scheduled, is configured to perform an uplink transmission via the unlicensed cell according to the uplink radio resources indicated in the first-stage uplink resource scheduling message, wherein the first-stage uplink resource scheduling message is a downlink control information, DCI, message of format 0A, 0B, 4A, or 4B, respectively comprising a first-stage flag indicating that the DCI message is a first message of a two-stages uplink resource scheduling. a receiver, which in operation, is configured to receive from the radio base station a first-stage uplink resource scheduling message, indicating uplink radio resources usable by the user equipment to perform an uplink transmission via the unlicensed cell, a processor, which in operation, is configured to determine whether the first-stage uplink resource scheduling message is valid or not, which comprises determining that the first-stage uplink resource scheduling message is valid in case one or more bits of one or more data fields in the first-stage uplink resource scheduling message are set to respectively predetermined values, the receiver, which in operation, is configured to receive from the radio base station a second-stage uplink resource scheduling message which is related to the first-stage uplink resource scheduling message, the processor, which in operation, is configured to determine when receiving the second-stage uplink resource scheduling message, that an uplink transmission is scheduled in case the processor determined that the first-stage uplink resource scheduling message is valid, and a transmitter, which in operation, and in case the processor determined that an uplink transmission is scheduled, is configured to perform an uplink transmission via the unlicensed cell according to the uplink radio resources indicated in the first-stage uplink resource scheduling message, wherein the first-stage uplink resource scheduling message is a downlink control information, DCI, message of format 0A, 0B, 4A, or 4B, respectively comprising a first-stage flag indicating that the DCI message is a first message of a two-stages uplink resource scheduling.