A method for packet flow-rate control within a network node (4) comprised within a packet-switched communication network connection linking a sender (1) to a receiver (2), the said method comprising the following steps - computing the average arrival rate of packets since the last packet mark or drop event; - sending a congestion signal to the sender as soon as the computed packet arrival rate is above a predefined target rate; - repeating congestion signal sending until the sender receives at least a congestion signal and consequently reduces the sending rate.