Method and apparatus for frequency sharing in a wireless data exchange system (orthogonal frequency-division multiplexing, OFDM) is based on the orthogonal frequency division multiplexing, wherein the based on the OFDM method radio data exchange system comprises a base station and a mobile unit within a radio frequency band work and the method comprises: detecting a disturbing signal in the radio frequency band; by the base station to set, on the basis of the interference signal, from Storhinweisdaten in a control header of a downlink frame that is to be sent to the mobile unit, the Storhinweisdaten specify a frequency range occupied by the interference signal in the radio frequency band; and by the base station sending the downlink frame to the mobile unit so the mobile unit can avoid the frequency range based on the malfunction data in which the interference signal is located. A radio system in which the method of the present invention is applied, can avoid faults which originate from a different, unknown system operating in the same radio frequency range, without an additional frame must be generated to propagate the Storhinweisdaten, so that the spectrum resources to a sufficient measurements can be used.