lena-radio-link-failure.cc

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/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2018 Fraunhofer ESK
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Vignesh Babu <ns3-dev@esk.fraunhofer.de>
 */
 
#include "ns3/core-module.h"
#include "ns3/network-module.h"
#include "ns3/internet-module.h"
#include "ns3/mobility-module.h"
#include "ns3/lte-module.h"
#include "ns3/applications-module.h"
#include "ns3/point-to-point-module.h"
#include <iostream>
#include <vector>
#include <stdio.h>
#include <iomanip>
 
using namespace ns3;
 
NS_LOG_COMPONENT_DEFINE ("LenaRadioLinkFailure");
 
//Global values to check the simulation
//behavior during and after the simulation.
uint16_t counterN310FirsteNB = 0;
Time t310StartTimeFirstEnb = Seconds (0);
uint32_t ByteCounter = 0;
uint32_t oldByteCounter = 0;
 
 
void
PrintUePosition (uint64_t imsi)
{
 
  for (NodeList::Iterator it = NodeList::Begin (); it != NodeList::End (); ++it)
    {
      Ptr<Node> node = *it;
      int nDevs = node->GetNDevices ();
      for (int j = 0; j < nDevs; j++)
        {
          Ptr<LteUeNetDevice> uedev = node->GetDevice (j)->GetObject <LteUeNetDevice> ();
          if (uedev)
            {
              if (imsi == uedev->GetImsi ())
                {
                  Vector pos = node->GetObject<MobilityModel> ()->GetPosition ();
                  std::cout << "IMSI : " << uedev->GetImsi () << " at " << pos.x << "," << pos.y << std::endl;
                }
            }
        }
    }
}
 
void
NotifyConnectionEstablishedUe (std::string context,
                               uint64_t imsi,
                               uint16_t cellid,
                               uint16_t rnti)
{
 
  std::cout << Simulator::Now ().As (Time::S) << " " << context
            << " UE IMSI " << imsi
            << ": connected to cell id " << cellid
            << " with RNTI " << rnti
            << std::endl;
}
 
void
NotifyConnectionEstablishedEnb (std::string context,
                                uint64_t imsi,
                                uint16_t cellId,
                                uint16_t rnti)
{
 
  std::cout << Simulator::Now ().As (Time::S) << " " << context
            << " eNB cell id " << cellId
            << ": successful connection of UE with IMSI " << imsi
            << " RNTI " << rnti
            << std::endl;
  //In this example, a UE should experience RLF at least one time in
  //cell 1. For the case, when there is only one eNB with ideal RRC,
  //a UE might reconnects to the eNB multiple times due to more than
  //one RLF. To handle this, we reset the counter here so, even if the UE
  //connects multiple time to cell 1 we count N310
  //indication correctly, i.e., for each RLF UE RRC should receive
  //configured number of N310 indications.
  if (cellId == 1)
    {
      counterN310FirsteNB = 0;
    }
}
 
static const std::string g_ueRrcStateName[LteUeRrc::NUM_STATES] =
{
  "IDLE_START",
  "IDLE_CELL_SEARCH",
  "IDLE_WAIT_MIB_SIB1",
  "IDLE_WAIT_MIB",
  "IDLE_WAIT_SIB1",
  "IDLE_CAMPED_NORMALLY",
  "IDLE_WAIT_SIB2",
  "IDLE_RANDOM_ACCESS",
  "IDLE_CONNECTING",
  "CONNECTED_NORMALLY",
  "CONNECTED_HANDOVER",
  "CONNECTED_PHY_PROBLEM",
  "CONNECTED_REESTABLISHING"
};
 
static const std::string & ToString (LteUeRrc::State s)
{
  return g_ueRrcStateName[s];
}
 
void
UeStateTransition (uint64_t imsi, uint16_t cellId, uint16_t rnti, LteUeRrc::State oldState, LteUeRrc::State newState)
{
 
  std::cout << Simulator::Now ().As (Time::S)
            << " UE with IMSI " << imsi << " RNTI " << rnti
            << " connected to cell " << cellId << " transitions from "
            << ToString (oldState) << " to " << ToString (newState)
            << std::endl;
}
 
void
EnbRrcTimeout (uint64_t imsi, uint16_t rnti, uint16_t cellId, std::string cause)
{
 
  std::cout << Simulator::Now ().As (Time::S)
            << " IMSI " << imsi << ", RNTI " << rnti << ", Cell id " << cellId
            << ", ENB RRC " << cause << std::endl;
}
 
void
NotifyConnectionReleaseAtEnodeB (uint64_t imsi, uint16_t cellId, uint16_t rnti)
{
  std::cout << Simulator::Now ()
            << " IMSI " << imsi << ", RNTI " << rnti << ", Cell id " << cellId
            << ", UE context destroyed at eNodeB" << std::endl;
}
 
void PhySyncDetection (uint16_t n310, uint64_t imsi, uint16_t rnti, uint16_t cellId, std::string type, uint8_t count)
{
 
  std::cout << Simulator::Now ().As (Time::S)
            << " IMSI " << imsi << ", RNTI " << rnti
            << ", Cell id " << cellId << ", " << type << ", no of sync indications: " << +count
            << std::endl;
 
  if (type == "Notify out of sync" && cellId == 1)
    {
      ++counterN310FirsteNB;
      if (counterN310FirsteNB == n310)
        {
          t310StartTimeFirstEnb = Simulator::Now ();
        }
      NS_LOG_DEBUG ("counterN310FirsteNB = " << counterN310FirsteNB);
    }
}
 
void RadioLinkFailure (Time t310, uint64_t imsi, uint16_t cellId, uint16_t rnti)
{
  std::cout << Simulator::Now ()
            << " IMSI " << imsi << ", RNTI " << rnti
            << ", Cell id " << cellId << ", radio link failure detected"
            << std::endl << std::endl;
 
  PrintUePosition (imsi);
 
  if (cellId == 1)
    {
      NS_ABORT_MSG_IF ((Simulator::Now () - t310StartTimeFirstEnb) != t310, "T310 timer expired at wrong time");
    }
}
 
void
NotifyRandomAccessErrorUe (uint64_t imsi, uint16_t cellId, uint16_t rnti)
{
  std::cout << Simulator::Now ().As (Time::S)
            << " IMSI " << imsi << ", RNTI " << rnti << ", Cell id " << cellId
            << ", UE RRC Random access Failed" << std::endl;
}
 
void
NotifyConnectionTimeoutUe (uint64_t imsi, uint16_t cellId, uint16_t rnti,
                           uint8_t connEstFailCount)
{
  std::cout << Simulator::Now ().As (Time::S)
            << " IMSI " << imsi << ", RNTI " << rnti
            << ", Cell id " << cellId
            << ", T300 expiration counter " << (uint16_t) connEstFailCount
            << ", UE RRC Connection timeout" << std::endl;
}
 
void
NotifyRaResponseTimeoutUe (uint64_t imsi, bool contention,
                           uint8_t preambleTxCounter,
                           uint8_t maxPreambleTxLimit)
{
  std::cout << Simulator::Now ().As (Time::S)
            << " IMSI " << imsi << ", Contention flag " << contention
            << ", preamble Tx Counter " << (uint16_t) preambleTxCounter
            << ", Max Preamble Tx Limit " << (uint16_t) maxPreambleTxLimit
            << ", UE RA response timeout" << std::endl;
}
 
void
ReceivePacket (Ptr<const Packet> packet, const Address &)
{
  ByteCounter += packet->GetSize ();
}
 
void
Throughput (bool firstWrite, Time binSize, std::string fileName)
{
  std::ofstream output;
 
  if (firstWrite == true)
    {
      output.open (fileName.c_str (), std::ofstream::out);
      firstWrite = false;
    }
  else
    {
      output.open (fileName.c_str (), std::ofstream::app);
    }
 
  //Instantaneous throughput every 200 ms
 
  double  throughput = (ByteCounter - oldByteCounter) * 8 / binSize.GetSeconds () / 1024 / 1024;
  output << Simulator::Now ().As (Time::S) << " " << throughput << std::endl;
  oldByteCounter = ByteCounter;
  Simulator::Schedule (binSize, &Throughput, firstWrite, binSize, fileName);
}
 
int
main (int argc, char *argv[])
{
  // Configurable parameters
  Time simTime = Seconds (25);
  uint16_t numberOfEnbs = 1;
  double interSiteDistance = 1200;
  uint16_t n311 = 1;
  uint16_t n310 = 1;
  Time t310 = Seconds (1);
  bool useIdealRrc = true;
  bool enableCtrlErrorModel = true;
  bool enableDataErrorModel = true;
  bool enableNsLogs = false;
 
  CommandLine cmd (__FILE__);
  cmd.AddValue ("simTime", "Total duration of the simulation (in seconds)", simTime);
  cmd.AddValue ("numberOfEnbs", "Number of eNBs", numberOfEnbs);
  cmd.AddValue ("n311", "Number of in-synch indication", n311);
  cmd.AddValue ("n310", "Number of out-of-synch indication", n310);
  cmd.AddValue ("t310", "Timer for detecting the Radio link failure (in seconds)", t310);
  cmd.AddValue ("interSiteDistance", "Inter-site distance in meter", interSiteDistance);
  cmd.AddValue ("useIdealRrc", "Use ideal RRC protocol", useIdealRrc);
  cmd.AddValue ("enableCtrlErrorModel", "Enable control error model", enableCtrlErrorModel);
  cmd.AddValue ("enableDataErrorModel", "Enable data error model", enableDataErrorModel);
  cmd.AddValue ("enableNsLogs", "Enable ns-3 logging (debug builds)", enableNsLogs);
  cmd.Parse (argc, argv);
 
  if (enableNsLogs)
    {
      LogLevel logLevel = (LogLevel) (LOG_PREFIX_FUNC | LOG_PREFIX_NODE | LOG_PREFIX_TIME | LOG_LEVEL_ALL);
      LogComponentEnable ("LteUeRrc", logLevel);
      LogComponentEnable ("LteUeMac", logLevel);
      LogComponentEnable ("LteUePhy", logLevel);
 
      LogComponentEnable ("LteEnbRrc", logLevel);
      LogComponentEnable ("LteEnbMac", logLevel);
      LogComponentEnable ("LteEnbPhy", logLevel);
 
      LogComponentEnable ("LenaRadioLinkFailure", logLevel);
    }
 
  uint16_t numberOfUes = 1;
  uint16_t numBearersPerUe = 1;
  double eNodeB_txPower = 43;
 
  Config::SetDefault ("ns3::LteHelper::UseIdealRrc", BooleanValue (useIdealRrc));
  Config::SetDefault ("ns3::LteSpectrumPhy::CtrlErrorModelEnabled", BooleanValue (enableCtrlErrorModel));
  Config::SetDefault ("ns3::LteSpectrumPhy::DataErrorModelEnabled", BooleanValue (enableDataErrorModel));
 
  Config::SetDefault ("ns3::LteRlcUm::MaxTxBufferSize", UintegerValue (60 * 1024));
 
  Ptr<LteHelper> lteHelper = CreateObject<LteHelper> ();
  Ptr<PointToPointEpcHelper> epcHelper = CreateObject<PointToPointEpcHelper> ();
  lteHelper->SetEpcHelper (epcHelper);
 
  lteHelper->SetPathlossModelType (TypeId::LookupByName ("ns3::LogDistancePropagationLossModel"));
  lteHelper->SetPathlossModelAttribute ("Exponent", DoubleValue (3.9));
  lteHelper->SetPathlossModelAttribute ("ReferenceLoss", DoubleValue (38.57)); //ref. loss in dB at 1m for 2.025GHz
  lteHelper->SetPathlossModelAttribute ("ReferenceDistance", DoubleValue (1));
 
  //----power related (equal for all base stations)----
  Config::SetDefault ("ns3::LteEnbPhy::TxPower", DoubleValue (eNodeB_txPower));
  Config::SetDefault ("ns3::LteUePhy::TxPower", DoubleValue (23));
  Config::SetDefault ("ns3::LteUePhy::NoiseFigure", DoubleValue (7));
  Config::SetDefault ("ns3::LteEnbPhy::NoiseFigure", DoubleValue (2));
  Config::SetDefault ("ns3::LteUePhy::EnableUplinkPowerControl", BooleanValue (true));
  Config::SetDefault ("ns3::LteUePowerControl::ClosedLoop", BooleanValue (true));
  Config::SetDefault ("ns3::LteUePowerControl::AccumulationEnabled", BooleanValue (true));
 
  //----frequency related----
  lteHelper->SetEnbDeviceAttribute ("DlEarfcn", UintegerValue (100)); //2120MHz
  lteHelper->SetEnbDeviceAttribute ("UlEarfcn", UintegerValue (18100)); //1930MHz
  lteHelper->SetEnbDeviceAttribute ("DlBandwidth", UintegerValue (25)); //5MHz
  lteHelper->SetEnbDeviceAttribute ("UlBandwidth", UintegerValue (25)); //5MHz
 
  //----others----
  lteHelper->SetSchedulerType ("ns3::PfFfMacScheduler");
  Config::SetDefault ("ns3::LteAmc::AmcModel", EnumValue (LteAmc::PiroEW2010));
  Config::SetDefault ("ns3::LteAmc::Ber", DoubleValue (0.01));
  Config::SetDefault ("ns3::PfFfMacScheduler::HarqEnabled", BooleanValue (true));
 
  Config::SetDefault ("ns3::FfMacScheduler::UlCqiFilter", EnumValue (FfMacScheduler::SRS_UL_CQI));
 
  //Radio link failure detection parameters
  Config::SetDefault ("ns3::LteUeRrc::N310", UintegerValue (n310));
  Config::SetDefault ("ns3::LteUeRrc::N311", UintegerValue (n311));
  Config::SetDefault ("ns3::LteUeRrc::T310", TimeValue (t310));
 
  NS_LOG_INFO ("Create the internet");
  Ptr<Node> pgw = epcHelper->GetPgwNode ();
  // Create a single RemoteHost0x18ab460
  NodeContainer remoteHostContainer;
  remoteHostContainer.Create (1);
  Ptr<Node> remoteHost = remoteHostContainer.Get (0);
  InternetStackHelper internet;
  internet.Install (remoteHostContainer);
  PointToPointHelper p2ph;
  p2ph.SetDeviceAttribute ("DataRate", DataRateValue (DataRate ("100Gb/s")));
  p2ph.SetDeviceAttribute ("Mtu", UintegerValue (1500));
  p2ph.SetChannelAttribute ("Delay", TimeValue (Seconds (0.010)));
  NetDeviceContainer internetDevices = p2ph.Install (pgw, remoteHost);
  Ipv4AddressHelper ipv4h;
  ipv4h.SetBase ("1.0.0.0", "255.0.0.0");
  Ipv4InterfaceContainer internetIpIfaces = ipv4h.Assign (internetDevices);
  Ipv4Address remoteHostAddr = internetIpIfaces.GetAddress (1);
  Ipv4StaticRoutingHelper ipv4RoutingHelper;
  Ptr<Ipv4StaticRouting> remoteHostStaticRouting = ipv4RoutingHelper.GetStaticRouting (remoteHost->GetObject<Ipv4> ());
  remoteHostStaticRouting->AddNetworkRouteTo (Ipv4Address ("7.0.0.0"), Ipv4Mask ("255.0.0.0"), 1);
 
  NS_LOG_INFO ("Create eNodeB and UE nodes");
  NodeContainer enbNodes;
  NodeContainer ueNodes;
  enbNodes.Create (numberOfEnbs);
  ueNodes.Create (numberOfUes);
 
  NS_LOG_INFO ("Assign mobility");
  Ptr<ListPositionAllocator> positionAllocEnb = CreateObject<ListPositionAllocator> ();
 
  for (uint16_t i = 0; i < numberOfEnbs; i++)
    {
      positionAllocEnb->Add (Vector (interSiteDistance * i, 0, 0));
    }
  MobilityHelper mobility;
  mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
  mobility.SetPositionAllocator (positionAllocEnb);
  mobility.Install (enbNodes);
 
  Ptr<ListPositionAllocator> positionAllocUe = CreateObject<ListPositionAllocator> ();
 
  for (int i = 0; i < numberOfUes; i++)
    {
      positionAllocUe->Add (Vector (200, 0, 0));
    }
 
  mobility.SetPositionAllocator (positionAllocUe);
  mobility.SetMobilityModel ("ns3::ConstantVelocityMobilityModel");
  mobility.Install (ueNodes);
 
  for (int i = 0; i < numberOfUes; i++)
    {
      ueNodes.Get (i)->GetObject<ConstantVelocityMobilityModel> ()->SetVelocity (Vector (30, 0.0, 0.0));
    }
 
  NS_LOG_INFO ("Install LTE Devices in eNB and UEs and fix random number stream");
  NetDeviceContainer enbDevs;
  NetDeviceContainer ueDevs;
 
  int64_t randomStream = 1;
 
  enbDevs = lteHelper->InstallEnbDevice (enbNodes);
  randomStream += lteHelper->AssignStreams (enbDevs, randomStream);
  ueDevs = lteHelper->InstallUeDevice (ueNodes);
  randomStream += lteHelper->AssignStreams (ueDevs, randomStream);
 
 
  NS_LOG_INFO ("Install the IP stack on the UEs");
  internet.Install (ueNodes);
  Ipv4InterfaceContainer ueIpIfaces;
  ueIpIfaces = epcHelper->AssignUeIpv4Address (NetDeviceContainer (ueDevs));
 
  NS_LOG_INFO ("Attach a UE to a eNB");
  lteHelper->Attach (ueDevs);
 
  NS_LOG_INFO ("Install and start applications on UEs and remote host");
  uint16_t dlPort = 10000;
  uint16_t ulPort = 20000;
 
  DataRateValue dataRateValue = DataRate ("18.6Mbps");
 
  uint64_t bitRate = dataRateValue.Get ().GetBitRate ();
 
  uint32_t packetSize = 1024; //bytes
 
  NS_LOG_DEBUG ("bit rate " << bitRate);
 
  double interPacketInterval = static_cast<double> (packetSize * 8) / bitRate;
 
  Time udpInterval = Seconds (interPacketInterval);
 
  NS_LOG_DEBUG ("UDP will use application interval " << udpInterval.As (Time::S) << " sec");
 
 
  for (uint32_t u = 0; u < numberOfUes; ++u)
    {
      Ptr<Node> ue = ueNodes.Get (u);
      // Set the default gateway for the UE
      Ptr<Ipv4StaticRouting> ueStaticRouting = ipv4RoutingHelper.GetStaticRouting (ue->GetObject<Ipv4> ());
      ueStaticRouting->SetDefaultRoute (epcHelper->GetUeDefaultGatewayAddress (), 1);
 
      for (uint32_t b = 0; b < numBearersPerUe; ++b)
        {
          ApplicationContainer ulClientApps;
          ApplicationContainer ulServerApps;
          ApplicationContainer dlClientApps;
          ApplicationContainer dlServerApps;
 
          ++dlPort;
          ++ulPort;
 
          NS_LOG_LOGIC ("installing UDP DL app for UE " << u + 1);
          UdpClientHelper dlClientHelper (ueIpIfaces.GetAddress (u), dlPort);
          dlClientHelper.SetAttribute ("Interval", TimeValue (udpInterval));
          dlClientHelper.SetAttribute ("PacketSize", UintegerValue (packetSize));
          dlClientHelper.SetAttribute ("MaxPackets", UintegerValue (1000000));
          dlClientApps.Add (dlClientHelper.Install (remoteHost));
 
          PacketSinkHelper dlPacketSinkHelper ("ns3::UdpSocketFactory", InetSocketAddress (Ipv4Address::GetAny (), dlPort));
          dlServerApps.Add (dlPacketSinkHelper.Install (ue));
 
          NS_LOG_LOGIC ("installing UDP UL app for UE " << u + 1);
          UdpClientHelper ulClientHelper (remoteHostAddr, ulPort);
          ulClientHelper.SetAttribute ("Interval", TimeValue (udpInterval));
          dlClientHelper.SetAttribute ("PacketSize", UintegerValue (packetSize));
          ulClientHelper.SetAttribute ("MaxPackets", UintegerValue (1000000));
          ulClientApps.Add (ulClientHelper.Install (ue));
 
          PacketSinkHelper ulPacketSinkHelper ("ns3::UdpSocketFactory", InetSocketAddress (Ipv4Address::GetAny (), ulPort));
          ulServerApps.Add (ulPacketSinkHelper.Install (remoteHost));
 
          Ptr<EpcTft> tft = Create<EpcTft> ();
          EpcTft::PacketFilter dlpf;
          dlpf.localPortStart = dlPort;
          dlpf.localPortEnd = dlPort;
          tft->Add (dlpf);
          EpcTft::PacketFilter ulpf;
          ulpf.remotePortStart = ulPort;
          ulpf.remotePortEnd = ulPort;
          tft->Add (ulpf);
          EpsBearer bearer (EpsBearer::NGBR_IMS);
          lteHelper->ActivateDedicatedEpsBearer (ueDevs.Get (u), bearer, tft);
 
          dlServerApps.Start (Seconds (0.27));
          dlClientApps.Start (Seconds (0.27));
          ulServerApps.Start (Seconds (0.27));
          ulClientApps.Start (Seconds (0.27));
        } // end for b
    }
  NS_LOG_INFO ("Enable Lte traces and connect custom trace sinks");
 
  lteHelper->EnableTraces ();
  Ptr<RadioBearerStatsCalculator> rlcStats = lteHelper->GetRlcStats ();
  rlcStats->SetAttribute ("EpochDuration", TimeValue (Seconds (0.05)));
  Ptr<RadioBearerStatsCalculator> pdcpStats = lteHelper->GetPdcpStats ();
  pdcpStats->SetAttribute ("EpochDuration", TimeValue (Seconds (0.05)));
 
  Config::Connect ("/NodeList/*/DeviceList/*/LteEnbRrc/ConnectionEstablished",
                   MakeCallback (&NotifyConnectionEstablishedEnb));
  Config::Connect ("/NodeList/*/DeviceList/*/LteUeRrc/ConnectionEstablished",
                   MakeCallback (&NotifyConnectionEstablishedUe));
  Config::ConnectWithoutContext ("/NodeList/*/DeviceList/*/LteUeRrc/StateTransition",
                                 MakeCallback (&UeStateTransition));
  Config::ConnectWithoutContext ("/NodeList/*/DeviceList/*/LteUeRrc/PhySyncDetection",
                                 MakeBoundCallback (&PhySyncDetection, n310));
  Config::ConnectWithoutContext ("/NodeList/*/DeviceList/*/LteUeRrc/RadioLinkFailure",
                                 MakeBoundCallback (&RadioLinkFailure, t310));
  Config::ConnectWithoutContext ("/NodeList/*/DeviceList/*/LteEnbRrc/NotifyConnectionRelease",
                                 MakeCallback (&NotifyConnectionReleaseAtEnodeB));
  Config::ConnectWithoutContext ("/NodeList/*/DeviceList/*/LteEnbRrc/RrcTimeout",
                                 MakeCallback (&EnbRrcTimeout));
  Config::ConnectWithoutContext ("/NodeList/*/DeviceList/*/LteUeRrc/RandomAccessError",
                                 MakeCallback (&NotifyRandomAccessErrorUe));
  Config::ConnectWithoutContext ("/NodeList/*/DeviceList/*/LteUeRrc/ConnectionTimeout",
                                   MakeCallback (&NotifyConnectionTimeoutUe));
  Config::ConnectWithoutContext ("/NodeList/*/DeviceList/*/$ns3::LteUeNetDevice/ComponentCarrierMapUe/*/LteUeMac/RaResponseTimeout",
                                   MakeCallback (&NotifyRaResponseTimeoutUe));
 
  //Trace sink for the packet sink of UE
  std::ostringstream oss;
  oss << "/NodeList/" << ueNodes.Get (0)->GetId () << "/ApplicationList/0/$ns3::PacketSink/Rx";
  Config::ConnectWithoutContext (oss.str (), MakeCallback (&ReceivePacket));
 
  bool firstWrite = true;
  std::string rrcType = useIdealRrc == 1 ? "ideal_rrc" : "real_rrc";
  std::string fileName = "rlf_dl_thrput_" + std::to_string (enbNodes.GetN ()) + "_eNB_" + rrcType;
  Time binSize = Seconds (0.2);
  Simulator::Schedule (Seconds (0.47), &Throughput, firstWrite, binSize, fileName);
 
  NS_LOG_INFO ("Starting simulation...");
 
  Simulator::Stop (simTime);
 
  Simulator::Run ();
 
  NS_ABORT_MSG_IF (counterN310FirsteNB != n310, "UE RRC should receive "
                   << n310 << " out-of-sync indications in Cell 1."
                   " Total received = " << counterN310FirsteNB);
 
  Simulator::Destroy ();
 
  return 0;
}