diagram {

SimProgram; LteHelper; EpcHelper; 

SimProgram => LteHelper [label="create"]
SimProgram => EpcHelper [label="create"] {
  EpcHelper -> EpcHelper [label="create MME, SGW and PGW"]
}

SimProgram => LteHelper [label="InstallEnbDevice"] {
  LteHelper -> LteHelper [label="install protocol stack on eNB"]
  LteHelper => EpcHelper [label="AddEnb"] {
    EpcHelper -> EpcHelper [label="setup S1-U, S1-AP, S5 and S11"]
  }
}

SimProgram => LteHelper [label="InstallUeDevice"] {
  LteHelper -> LteHelper [label="install protocol stack on UE"]
}

SimProgram => LteHelper [label="Attach (UE, eNB)"] {
  LteHelper -> LteHelper [label="tell UE NAS to start connection"]
  LteHelper => EpcHelper [label="ActivateEpsBearer (default)"] {
    EpcHelper -> EpcHelper [label="tell MME to activate bearer when UE connects"]
  }
}

SimProgram => LteHelper [label="ActivateDedicatedEpsBearer"] {
  LteHelper => EpcHelper [label="ActivateEpsBearer"] {
    EpcHelper -> EpcHelper [label="tell MME to activate bearer when UE connects"]
  }
}

}
