A method performed in a radio unit for handling Frequency Domain, FD, imaginary/quadrature, I/Q, data of each OFDM symbol in the frequency domain using one complex valued number per resource element, said FD I/Q data representing Physical Uplink Shared Channel, PUSCH, transmission of one or more User Equipments, UEs, (121, 122, 123), to a central control unit associated with the radio unit in a wireless communications network, which communications network comprises a switched Ethernet Common Public Radio Interface, eCPRI, front-haul network that uses Instant Uplink Access, IUA, wherein the central control unit is connected to several antenna sites (141, 142, 143) and further connected to radio units (111, 112, 113) including the radio unit through a front-haul switch, the method comprising: detecting an uplink transmission energy from the one or more UEs (121, 122, 123), deciding whether the detected uplink transmission energy from the respective one or more UEs (121, 122, 123) is above or below a first threshold, - when it is decided that the detected uplink transmission energy from any of the one or more UEs (121, 122, 123) is above the first threshold, sending the FD I/Q data representing those respective one or more UEs (121, 122, 123) to the central control unit, and - when it is decided that the detected uplink transmission energy from any of the one or more UEs (121, 122, 123) is below the first threshold, sending a message to the central control unit which message indicates that no FD I/Q data will be sent representing those respective one or more UEs (121, 122, 123), and refraining from sending the FD I/Q data representing those respective one or more UEs (121, 122, 123) to the central control unit, wherein the uplink transmission from the respective one or more UEs (121,122,123) is the Physical Uplink Shared Channel, PUSCH, transmission. detecting an uplink transmission energy from the one or more UEs (121, 122, 123), deciding whether the detected uplink transmission energy from the respective one or more UEs (121, 122, 123) is above or below a first threshold, - when it is decided that the detected uplink transmission energy from any of the one or more UEs (121, 122, 123) is above the first threshold, sending the FD I/Q data representing those respective one or more UEs (121, 122, 123) to the central control unit, and - when it is decided that the detected uplink transmission energy from any of the one or more UEs (121, 122, 123) is below the first threshold, sending a message to the central control unit which message indicates that no FD I/Q data will be sent representing those respective one or more UEs (121, 122, 123), and refraining from sending the FD I/Q data representing those respective one or more UEs (121, 122, 123) to the central control unit, - when it is decided that the detected uplink transmission energy from any of the one or more UEs (121, 122, 123) is above the first threshold, sending the FD I/Q data representing those respective one or more UEs (121, 122, 123) to the central control unit, and - when it is decided that the detected uplink transmission energy from any of the one or more UEs (121, 122, 123) is below the first threshold, sending a message to the central control unit which message indicates that no FD I/Q data will be sent representing those respective one or more UEs (121, 122, 123), and refraining from sending the FD I/Q data representing those respective one or more UEs (121, 122, 123) to the central control unit, wherein the uplink transmission from the respective one or more UEs (121,122,123) is the Physical Uplink Shared Channel, PUSCH, transmission.