A technique for controlling data transmission over a connection employing congestion control is provided. The technique comprises two basic aspects: Detecting a decrease of Round Trip Time in respect of the connection, wherein the detection is facilitated by comparing a short-term Round Trip Time average with a long-term Round Trip Time average (302); and, in response to a result of the detection, adjusting the congestion control so as to increase the data transmission rate (304). Particularly, adjusting the congestion control includes enabling a data transmission rate that is (even) higher than what would have been allowed by any conventional, congestion control. In effect, the present technique may ‘push’ the conventional congestion control when it is not increasing the data transmission rate fast enough.