The invention relates to a wireless telecommunication system including a transmitter and a receiver, said transmitter being used to transmit data packets to the receiver, said receiver including error detection means (220) in order to detect if a received packet contains errors, and further comprising means of outage detection (225) in order to determine, in the event an error packet is detected, if the transmission channel between the transmitter and the receiver is in an outage situation and in order to transmit a first (OUTAGE) signal indicating this situation, the transmitter being used to modify the conditions of transmission in response to said first signal.