System and process for QoS-based packet scheduling

System ( 1 ) for scheduling the attribution of hardware output resources to data packets (P) handled by different service providers, comprising: an extraction device ( 2 ) extracting a Quality of Service parameter included in a packet header (PH); a random value generator ( 34 ); a programmable key attribution device ( 3 ) attributing a priority key ( ) to a packet depending on the Quality of Service parameter and on the generated random value, according to programmable rules; a scheduling device ( 4 ) comprising a command generator generating packet switching commands in an order depending on the value of the priority key attributed to each packet header; a switching device ( 6 ) routing the packets towards hardware output resources in the order of the generated packet switching commands.