A half-duplex (HD), frequency division duplexing (FDD), method for wireless communication systems, implementing an uplink and downlink prioritization respectively for a HD-FDD type mobile communication terminal during a transition between a downlink (DL) sub-frame, labelled n, and an uplink (UL) sub-frame, labelled n+1, in order to avoid overlapping of said sub-frames. This method comprises a step of sending by a base station an allocation message, a step of receiving the allocation message by said terminal and a step of processing said allocation message by said terminal.