A method comprising: establishing a data radio bearer, DRB, by a base station with a user equipment, UE, in a wireless communications network, wherein the DRB is associated with an Evolved Packet System, EPS, bearer and a logical channel, and the EPS bearer has a QoS profile that includes a Quality Class Identifier, QCI; scheduling, by the base station, an uplink data transmission for the UE, and determining a channel access priority class, CAPC, for an uplink, UL, listen before talk, LBT, procedure to gain uplink access for the uplink data transmission from the UE; transmitting, by the base station, uplink scheduling information over a physical downlink control channel, PDCCH, to the UE, wherein the uplink scheduling information comprises the determined CAPC; and receiving, by the base station, the uplink data transmission from the UE over an unlicensed frequency band in response to successful completion of the UL LBT procedure; wherein the method is characterized in that: the uplink data transmission occupies consecutive multiple subframes and the UL LBT procedure is performed only in the first subframe; and the logical channel is associated with the CAPC that is mapped from the QCI or a logical channel prioritization, LCP; and the uplink data transmission comprises a media access control, MAC, protocol data unit, PDU, that is filled with data from logical channels configured with priorities lower than a priority associated with the CAPC; and in response to a duration of the uplink data transmission not being exhausted by the MAC PDU, the MAC PDU is further filled with data from logical channels configured with priorities equal to or higher than the priority associated with the CAPC. establishing a data radio bearer, DRB, by a base station with a user equipment, UE, in a wireless communications network, wherein the DRB is associated with an Evolved Packet System, EPS, bearer and a logical channel, and the EPS bearer has a QoS profile that includes a Quality Class Identifier, QCI; scheduling, by the base station, an uplink data transmission for the UE, and determining a channel access priority class, CAPC, for an uplink, UL, listen before talk, LBT, procedure to gain uplink access for the uplink data transmission from the UE; transmitting, by the base station, uplink scheduling information over a physical downlink control channel, PDCCH, to the UE, wherein the uplink scheduling information comprises the determined CAPC; and receiving, by the base station, the uplink data transmission from the UE over an unlicensed frequency band in response to successful completion of the UL LBT procedure; wherein the method is characterized in that: the uplink data transmission occupies consecutive multiple subframes and the UL LBT procedure is performed only in the first subframe; and the logical channel is associated with the CAPC that is mapped from the QCI or a logical channel prioritization, LCP; and the uplink data transmission comprises a media access control, MAC, protocol data unit, PDU, that is filled with data from logical channels configured with priorities lower than a priority associated with the CAPC; and in response to a duration of the uplink data transmission not being exhausted by the MAC PDU, the MAC PDU is further filled with data from logical channels configured with priorities equal to or higher than the priority associated with the CAPC. the uplink data transmission occupies consecutive multiple subframes and the UL LBT procedure is performed only in the first subframe; and the logical channel is associated with the CAPC that is mapped from the QCI or a logical channel prioritization, LCP; and the uplink data transmission comprises a media access control, MAC, protocol data unit, PDU, that is filled with data from logical channels configured with priorities lower than a priority associated with the CAPC; and in response to a duration of the uplink data transmission not being exhausted by the MAC PDU, the MAC PDU is further filled with data from logical channels configured with priorities equal to or higher than the priority associated with the CAPC.