Reduction of interference between neighbor transmissions

A wireless communications network system is operated to provide a first transmission band and a second transmission band being separated by a narrow band. An apparatus is configured to transmit an indicator signal in the narrow band prior to transmitting a data signal in the same, so as to indicate the transmission of the data signal. The first and/or the second transmission bands are consequently modified in order to reduce leakages in the narrow band, e.g. by reducing the bandwidth. After the data transmission in teh narrowband, the first and/or the second transmission band are relaxed coming back to the original bandwidth.