Simulation Models

RAN simulator defines two levels of simulation models:

  • Generic model: that defines E2 nodes, cells, service models, E2T end points in a Yaml file. RAN simulator reads this file to create E2 nodes and initializing data stores. A sample model has been created using the Honeycomb Topology Generator and added to the ran-simulator helm chart.

  • Use Case Specific Models: The simulation information that is not common between use cases can be added as new service models will be introduced. These models can be added to the ran-simulator helm chart and can be loaded by RAN simulator.

MHO specific model

One example of a use case specific model is the two-cell-two-node-model.yaml model, is used by onos-mho xApplication to emulate UEs moving between pre-determined end-points. As opposed to the generic model that supports UEs moving on random routes (with randomly generated end-points), the two-cell-two-node-model is ideally suited to test handover scenarios deterministically. In order to support this model, RANSim supports the ability to specify the following directives in the model’s yaml description:

  • routeEndPoints: Start and end end-point coordinates for routes

  • directRoute: Direct route between end-points (as opposed to the default randomly zig-zagging route)

  • initialRrcState: Specify the initial RRC state of UEs (as opposed to the default randomly assigned initial state)

  • rrcStateChangesDisabled: Disable RRC state changes