Abstract: Methods, apparatus, and systems are provided to simulate a network carrying a heterogeneous mix of traffic in order to assess the performance of the network. Parameters and information are provided to define the configuration of the network and define how resources in the network are shared between types of traffic for a simulation run. In addition, sets of parameters define characteristics for individual types of traffic. During a simulation run, the individual types of traffic are generated with the defined characteristics using one or more models. The individual types of traffic are then aggregated to generate a joint, heterogeneous mix of traffic. As the mix of traffic is generated, resources in the network are allocated. Statistics are then collected for each simulation run to indicate the performance of the simulated network when loaded with the heterogeneous mix of traffic.