Hi Nothapat,
there are 5 traffic models implemented in our simulator (voip, video, gaming, http, ftp) which you can find in the folder +traffic_models. When activated, each UE is assigned one of these traffic models randomly (in the function LTE_trafficmodel.m). You can use the launcher file LTE_sim_main_launcher_demo_trafficmodels.m to do so.
You can of course adapt the existing traffic models to your needs, by following the already existing structure.
Best regards,
Martin