A method for operating a plurality of wireless networks, comprising at least two different wireless networks, a first wireless network, 'FWN', and a second wireless network, 'SWN', each network comprising one or more stations "FWN-S", "SWN-S", connected to each other within the respective first wireless and second wireless network and forming said respective first wireless and second wireless network, wherein transmission between said SWN-S within the SWN is performed via channels, wherein after each successful transmission a channel is free of transmissions for a predetermined time period, 'PTP', and wherein said FWN and said SWN operate at least in part in overlapping frequency bands, comprising the steps of Sensing of a channel in the SWN at the beginning of a PTP if being idle and when being sensed idle blocking of said channel within a first time period by a FWN-S for a transmission by said FWN-S, connected to said FWN and said SWN by an overlapping frequency band, wherein said first time period being smaller than said PTP, comprising indicating part of a total airtime said channel in the SWN will be occupied by said FWN-S for the transmission, wherein the total airtime is computed as a sum of time slots used for successful transmission in said SWN, their number being computed in order to a transmission performance of said SWN is not degraded more than a level of transmission performance is degraded if said FWN-S would be operating for transmission within said SWN only, wherein the transmission performance being defined as throughput of said SWN, and wherein a second time period is specified including a number of PTPs and wherein said FWN-S then transmits after beginning of every PTP of said number of PTPs, said number of PTPs being dependent on a fraction of idle time slots for transmission in said SWN that would have to change to non-idle time slots for an expected transmission duration and wherein said fraction is calculated based on a probability that none of the SWN-S transmit and a period of PTP opportunities, wherein said probability is calculated based on the probabilities of the SWN-S transmitting in a time slot. Sensing of a channel in the SWN at the beginning of a PTP if being idle and when being sensed idle blocking of said channel within a first time period by a FWN-S for a transmission by said FWN-S, connected to said FWN and said SWN by an overlapping frequency band, wherein said first time period being smaller than said PTP, comprising indicating part of a total airtime said channel in the SWN will be occupied by said FWN-S for the transmission, wherein the total airtime is computed as a sum of time slots used for successful transmission in said SWN, their number being computed in order to a transmission performance of said SWN is not degraded more than a level of transmission performance is degraded if said FWN-S would be operating for transmission within said SWN only, wherein the transmission performance being defined as throughput of said SWN, and wherein a second time period is specified including a number of PTPs and wherein said FWN-S then transmits after beginning of every PTP of said number of PTPs, said number of PTPs being dependent on a fraction of idle time slots for transmission in said SWN that would have to change to non-idle time slots for an expected transmission duration and wherein said fraction is calculated based on a probability that none of the SWN-S transmit and a period of PTP opportunities, wherein said probability is calculated based on the probabilities of the SWN-S transmitting in a time slot.