A method of handover between two WLAN cells based on the IEEE 802.11 standard and working at two different frequencies, the method including the step of performing measurement(s) on the second frequency in order to verify the necessity or the opportunity to realise a handover, the first frequency being currently used to transmit data, the method characterised in that it involves: first sending at least one dummy data or control frame on the first frequency which is currently used for transmitting data, the data or control frame including a duration data with a value at least equal to the time needed to perform the measurement(s) at the second frequency, and, then performing the measurement(s) on the second frequency.
