A method in a radio network node for controlling usage of Radio Access Technology, RAT, and bandwidth in a radio communication system, wherein the radio communication system comprises the radio network node configured to support transmission and reception of signals in a first RAT and in a second RAT, wherein the radio communication system comprises a plurality of terminals, and wherein each terminal supports only the first RAT, only the second RAT, or both RATs, the method comprising: - allocating the first RAT to a first bandwidth; - allocating the second RAT to a second bandwidth; - allocating the first RAT and the second RAT to a third bandwidth, wherein the third bandwidth comprises a part of the first bandwidth and/or a part of the second bandwidth; and - when traffic in the first RAT is higher than traffic in the second RAT: - transmitting data for the first RAT in both the first bandwidth and in the third bandwidth; - transmitting data for the second RAT only in the second bandwidth; and - transmitting control signals and/or pilot signals for the first RAT in both the first bandwidth and in the third bandwidth; the method being characterized by adjusting transmit power of the transmission in the third bandwidth to not exceed a power threshold, wherein the power threshold corresponds to the maximum transmit power of the first RAT in the third bandwidth, wherein the power threshold is determined based on pilot signal measurements performed by one or more terminals, and wherein the transmit power is continuously adjusted so that a quality of pilot signals for the one or more terminals exceeds a power reception threshold. - allocating the first RAT to a first bandwidth; - allocating the second RAT to a second bandwidth; - allocating the first RAT and the second RAT to a third bandwidth, wherein the third bandwidth comprises a part of the first bandwidth and/or a part of the second bandwidth; and - when traffic in the first RAT is higher than traffic in the second RAT: - transmitting data for the first RAT in both the first bandwidth and in the third bandwidth; - transmitting data for the second RAT only in the second bandwidth; and - transmitting control signals and/or pilot signals for the first RAT in both the first bandwidth and in the third bandwidth; the method being characterized by adjusting transmit power of the transmission in the third bandwidth to not exceed a power threshold, wherein the power threshold corresponds to the maximum transmit power of the first RAT in the third bandwidth, wherein the power threshold is determined based on pilot signal measurements performed by one or more terminals, and wherein the transmit power is continuously adjusted so that a quality of pilot signals for the one or more terminals exceeds a power reception threshold. - transmitting data for the first RAT in both the first bandwidth and in the third bandwidth; - transmitting data for the second RAT only in the second bandwidth; and - transmitting control signals and/or pilot signals for the first RAT in both the first bandwidth and in the third bandwidth; the method being characterized by adjusting transmit power of the transmission in the third bandwidth to not exceed a power threshold, wherein the power threshold corresponds to the maximum transmit power of the first RAT in the third bandwidth, wherein the power threshold is determined based on pilot signal measurements performed by one or more terminals, and wherein the transmit power is continuously adjusted so that a quality of pilot signals for the one or more terminals exceeds a power reception threshold.