A radio node (705, 711) is configured to transmit, within a guard band of a first radio access technology (RAT), a radio signal (709) according to a second RAT. The radio node (705, 711) determines, based on a channel bandwidth (731) of the first RAT, one or more transmit parameters for transmission of the radio signal (709) according to the second RAT within the guard band of the first RAT, for transmission of the radio signal (709) to comply with emission limits for the first RAT. The one or more transmit parameters include a frequency position of the radio signal (709) within the guard band for the first RAT. The radio node (705, 711) also configures the radio node (705, 711) with the one or more transmit parameters for transmitting the radio signal (709) according to the second RAT within the guard band of the first RAT.