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.