that certain frames or parts of frames are not decodable the terminal mt 5 will declare that it is in a situation of interference when it is not able correctly to receive these association messages originating from the network n 1 thus the interfering signal for example a frame of another network need not be intelligible in respect of the apparatus seeking to detect the interference the terminal simply has to know the address of the access point of the network with which it wishes to associate itself thus instead of initiating a conventional association procedure the terminal sends the network n 1 a so called emergency request consisting in asking the network n 1 to initiate a dynamic frequency selection to the exclusion of the current frequency this request also contains the identity of the network n 1 so as to prevent the two networks n 1 and n 2 from changing frequency simultaneously the networks detect the identity and react only if it is addressed to them the emergency request is transmitted in the rch field of the hiperlan 2 frame of the network n 1 the third parameter can influence the decision of the base station ap 1 to accept.