Data is transmitted from a radio communication device by selecting a signal dependent on data to be transmitted, transmitting to a radio communication station the selected signal as a random access transmission, deriving an identifier dependent on the data, and employing the identifier to identify a subsequently received signal intended for the radio communication device The data is received at a radio communication station by receiving the random access signal which is indicative of the data to be received, determining the data indicated by the random access signal, deriving an identifier dependent on the determined data, and including the identifier in a subsequent transmission from the radio communication station to identify the intended recipient of the subsequent transmission.