A method of simulating transmission of data from a transmitter to a receiver in a radio communications network, the method comprising: - calculating an average amount of data to be transmitted in a simulated transmission to the receiver in a considered transmission time interval, wherein said average amount of data is calculated based on a relationship (C1,C2,C3,C4) between an interferential condition assumed to be experienced at the receiver and a data transmission throughput, said relationship being determined by means of a link-level simulation of the link between the transmitter and the receiver, wherein said interferential condition is estimated in a transmission time interval (TTI n-1) preceding the considered transmission time interval (TTI n); characterized by comprising: - determining a transmission power available for transmission at the transmitter, and using said estimated interferential condition and the determined transmission power to calculate a SNR or an Ec/N0 experienced at the receiver; - determining a number of transmission channels exploitable for transmitting data from the transmitter to the receiver, and, based on the determined number of transmission channels, selecting one curve among a family of curves linking the SNR or the Ec/N0 experienced at the receiver to the throughout, said curves being determined by means of the link-level simulation of the link between the transmitter and the receiver; - composing a packet data unit to be transmitted in the simulated transmission in the considered transmission time interval, said packet data unit containing the calculated average amount of data; - simulating the transmission of said packet data unit to the receiver. - calculating an average amount of data to be transmitted in a simulated transmission to the receiver in a considered transmission time interval, wherein said average amount of data is calculated based on a relationship (C1,C2,C3,C4) between an interferential condition assumed to be experienced at the receiver and a data transmission throughput, said relationship being determined by means of a link-level simulation of the link between the transmitter and the receiver, wherein said interferential condition is estimated in a transmission time interval (TTI n-1) preceding the considered transmission time interval (TTI n); characterized by comprising: - determining a transmission power available for transmission at the transmitter, and using said estimated interferential condition and the determined transmission power to calculate a SNR or an Ec/N0 experienced at the receiver; - determining a number of transmission channels exploitable for transmitting data from the transmitter to the receiver, and, based on the determined number of transmission channels, selecting one curve among a family of curves linking the SNR or the Ec/N0 experienced at the receiver to the throughout, said curves being determined by means of the link-level simulation of the link between the transmitter and the receiver; - composing a packet data unit to be transmitted in the simulated transmission in the considered transmission time interval, said packet data unit containing the calculated average amount of data; - simulating the transmission of said packet data unit to the receiver.