In a wireless mesh network a method includes, at a first node, receiving a transmission from a second node during a first sub-frame of a frame with a first transceiver operating with a first center frequency; processing the received transmission; and transmitting, after a predetermined fixed interval, with a second transceiver operating with a second center frequency the processed received transmission to a third node during a second sub-frame of a subsequent frame or of the same frame. Also disclosed are computer programs to execute the method, as well as apparatus constructed to implement the method.