S202: The wireless devices 300a, 300b perform RSSI measurements at the frequency fc_current of the current channel neighbouring frequencies f1, f2 and report these RSSI measurements periodically to the network node 200, which thus obtains the RSSI measurements.

S203: The network node 200 checks how many of the wireless devices 300a, 300b have strong interference from one or more of the neighbor frequencies f1, f2 according to the RSSI measurements.

S204: The network node 200 checks if more than a certain portion of the wireless devices 300a, 300b have strong interference from one or more of the neighbor frequencies f1, f2 according to the RSSI measurements. If no, step S202 is entered again. If yes, step S205 is entered.

S205: The RSSI measurements as performed by the wireless devices 300a, 300b trigger channel reconfiguration to be made by the network node 200.

S206: The network node 200 selects a new channel based on RSSI measurements performed by the network node 200 in accordance with what has been disclosed above. These RSSI measurements are either historical RSSI measurements or new RSSI measurements.

S207: The network node 200 requests, from the SAS, access to use the new channel. If a grant of the access is not received, step S206 is entered again for the network node 200 to select another new channel. If a grant of the access is received, step S208 is entered.