test-lte-rrc.cc

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/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2012 Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)
 *
 * 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: Nicola Baldo <nbaldo@cttc.es>
 *         Budiarto Herman <budiarto.herman@magister.fi>
 */


#include <ns3/core-module.h>
#include <ns3/network-module.h>
#include <ns3/mobility-module.h>
#include <ns3/lte-module.h>
#include <cmath>

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("LteRrcTest");

class LteRrcConnectionEstablishmentTestCase : public TestCase
{
public:
  LteRrcConnectionEstablishmentTestCase (uint32_t nUes,
                                         uint32_t nBearers,
                                         uint32_t tConnBase,
                                         uint32_t tConnIncrPerUe,
                                         uint32_t delayDiscStart,
                                         bool errorExpected,
                                         bool useIdealRrc,
                                         bool admitRrcConnectionRequest,
                                         std::string description = "");

protected:

  virtual void DoRun (void);
  uint32_t m_nUes; 

  static std::string BuildNameString (uint32_t nUes,
                                      uint32_t nBearers,
                                      uint32_t tConnBase,
                                      uint32_t tConnIncrPerUe,
                                      uint32_t delayDiscStart,
                                      bool useIdealRrc,
                                      bool admitRrcConnectionRequest,
                                      std::string description = "");
  void Connect (Ptr<NetDevice> ueDevice, Ptr<NetDevice> enbDevice);
  void CheckConnected (Ptr<NetDevice> ueDevice, Ptr<NetDevice> enbDevice);
  void CheckNotConnected (Ptr<NetDevice> ueDevice, Ptr<NetDevice> enbDevice);
  void ConnectionEstablishedCallback (std::string context, uint64_t imsi,
                                      uint16_t cellId, uint16_t rnti);
  void ConnectionTimeoutCallback (std::string context, uint64_t imsi,
                                  uint16_t cellId, uint16_t rnti,
                                  uint8_t connEstFailCount);

  uint32_t m_nBearers; 
  uint32_t m_tConnBase;  
  uint32_t m_tConnIncrPerUe; 
  uint32_t m_delayConnEnd;  
  uint32_t m_delayDiscStart;  
  uint32_t m_delayDiscEnd; 
  bool     m_useIdealRrc; 
  bool     m_admitRrcConnectionRequest; 
  Ptr<LteHelper> m_lteHelper; 

  std::map<uint64_t, bool> m_isConnectionEstablished; 
};


std::string
LteRrcConnectionEstablishmentTestCase::BuildNameString (uint32_t nUes,
                                                        uint32_t nBearers,
                                                        uint32_t tConnBase,
                                                        uint32_t tConnIncrPerUe,
                                                        uint32_t delayDiscStart,
                                                        bool useIdealRrc,
                                                        bool admitRrcConnectionRequest,
                                                        std::string description)
{
  std::ostringstream oss;
  oss << "nUes=" << nUes
      << ", nBearers=" << nBearers
      << ", tConnBase=" << tConnBase
      << ", tConnIncrPerUe=" << tConnIncrPerUe
      << ", delayDiscStart=" << delayDiscStart;

  if (useIdealRrc)
    {
      oss << ", ideal RRC";
    }
  else
    {
      oss << ", real RRC";
    }

  if (admitRrcConnectionRequest)
    {
      oss << ", admitRrcConnectionRequest = true";
    }
  else
    {
      oss << ", admitRrcConnectionRequest = false";
    }

  if (!description.empty ())
    {
      oss << ", " << description;
    }

  return oss.str ();
}

LteRrcConnectionEstablishmentTestCase::LteRrcConnectionEstablishmentTestCase (
    uint32_t nUes, uint32_t nBearers,
    uint32_t tConnBase, uint32_t tConnIncrPerUe, uint32_t delayDiscStart,
    bool errorExpected, bool useIdealRrc, bool admitRrcConnectionRequest,
    std::string description)
  : TestCase (BuildNameString (nUes, nBearers,
                               tConnBase, tConnIncrPerUe, delayDiscStart,
                               useIdealRrc, admitRrcConnectionRequest,
                               description)),
    m_nUes (nUes),
    m_nBearers (nBearers),
    m_tConnBase (tConnBase),
    m_tConnIncrPerUe (tConnIncrPerUe),

    m_delayDiscStart (delayDiscStart),
    m_delayDiscEnd (10),
    m_useIdealRrc (useIdealRrc),
    m_admitRrcConnectionRequest (admitRrcConnectionRequest)
{
  NS_LOG_FUNCTION (this << GetName ());

  // see the description of d^e in the LTE testing docs
  double dsi = 90;
  double nRaAttempts = 0;
  if (nUes <= 20)
    {
      nRaAttempts += 5;
    }
  else
    {
      NS_ASSERT (nUes <= 50);
      nRaAttempts += 10;
    }

  nRaAttempts += std::ceil (nUes / 4.0);
  double dra = nRaAttempts * 7;
  double dce = 10.0 + (2.0 * nUes) / 4.0;
  if (errorExpected)
    {
      /*
       * If transmission error happens, the UE has to repeat again from
       * acquiring system information.
       */
      dce += dsi + dce;
    }
  double nCrs;
  if (nUes <= 2)
    {
      nCrs = 0;
    }
  else if (nUes <= 5)
    {
      nCrs = 1;
    }
  else if (nUes <= 10)
    {
      nCrs = 2;
    }
  else if (nUes <= 20)
    {
      nCrs = 3;
    }
  else
    {
      nCrs = 4;
    }
  double dcr =  (10.0 + (2.0 * nUes) / 4.0) * (m_nBearers + nCrs);

  m_delayConnEnd = round (dsi + dra + dce + dcr);
  NS_LOG_LOGIC (this << " " << GetName () << " dsi=" << dsi << " dra=" << dra << " dce=" << dce << " dcr=" << dcr << " m_delayConnEnd=" << m_delayConnEnd);
}

void
LteRrcConnectionEstablishmentTestCase::DoRun ()
{
  NS_LOG_FUNCTION (this << GetName ());
  Config::Reset ();

  if (m_nUes < 25)
    {
      Config::SetDefault ("ns3::LteEnbRrc::SrsPeriodicity", UintegerValue (40));
    }
  else if (m_nUes < 60)
    {
      Config::SetDefault ("ns3::LteEnbRrc::SrsPeriodicity", UintegerValue (80));
    }
  else if (m_nUes < 120)
    {
      Config::SetDefault ("ns3::LteEnbRrc::SrsPeriodicity", UintegerValue (160));
    }
  else
    {
      Config::SetDefault ("ns3::LteEnbRrc::SrsPeriodicity", UintegerValue (320));
    }

  // normal code
  m_lteHelper = CreateObject<LteHelper> ();
  m_lteHelper->SetAttribute ("UseIdealRrc", BooleanValue (m_useIdealRrc));

  NodeContainer enbNodes;
  NodeContainer ueNodes;


  enbNodes.Create (1);
  ueNodes.Create (m_nUes);

  // the following positions all nodes at (0, 0, 0)
  MobilityHelper mobility;
  mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
  mobility.Install (enbNodes);
  mobility.Install (ueNodes);

  int64_t stream = 1;
  NetDeviceContainer enbDevs;
  enbDevs = m_lteHelper->InstallEnbDevice (enbNodes);
  stream += m_lteHelper->AssignStreams (enbDevs, stream);

  NetDeviceContainer ueDevs;
  ueDevs = m_lteHelper->InstallUeDevice (ueNodes);
  stream += m_lteHelper->AssignStreams (ueDevs, stream);

  // custom code used for testing purposes
  // instead of lteHelper->Attach () and lteHelper->ActivateXxx

  // Set AdmitConnectionRequest attribute
  for (NetDeviceContainer::Iterator it = enbDevs.Begin ();
       it != enbDevs.End ();
       ++it)
    {
      Ptr<LteEnbRrc> enbRrc = (*it)->GetObject<LteEnbNetDevice> ()->GetRrc ();
      enbRrc->SetAttribute ("AdmitRrcConnectionRequest",
                            BooleanValue (m_admitRrcConnectionRequest));
    }


  uint32_t i = 0;
  uint32_t tmax = 0;
  for (NetDeviceContainer::Iterator it = ueDevs.Begin (); it != ueDevs.End (); ++it)
    {
      Ptr<NetDevice> ueDevice = *it;
      Ptr<NetDevice> enbDevice = enbDevs.Get (0);
      Ptr<LteUeNetDevice> ueLteDevice = ueDevice->GetObject<LteUeNetDevice> ();

      uint32_t tc = m_tConnBase + m_tConnIncrPerUe * i; // time connection start
      uint32_t tcc = tc + m_delayConnEnd; // time check connection completed;
      uint32_t td =  tcc + m_delayDiscStart; // time disconnect start
      uint32_t tcd = td + m_delayDiscEnd; // time check disconnection completed
      tmax = std::max (tmax, tcd);

      // trick to resolve overloading
      //void (LteHelper::* overloadedAttachFunctionPointer) (Ptr<NetDevice>, Ptr<NetDevice>) = &LteHelper::Attach;
      //Simulator::Schedule (MilliSeconds (tc), overloadedAttachFunctionPointer, lteHelper, *it, enbDevice);
      Simulator::Schedule (MilliSeconds (tc), &LteRrcConnectionEstablishmentTestCase::Connect, this, ueDevice, enbDevice);

      Simulator::Schedule (MilliSeconds (tcc), &LteRrcConnectionEstablishmentTestCase::CheckConnected, this, *it, enbDevice);

      // disconnection not supported yet

      uint64_t imsi = ueLteDevice->GetImsi ();
      m_isConnectionEstablished[imsi] = false;

      ++i;
    }

  // Connect to trace sources in UEs
  Config::Connect ("/NodeList/*/DeviceList/*/LteUeRrc/ConnectionEstablished",
                   MakeCallback (&LteRrcConnectionEstablishmentTestCase::ConnectionEstablishedCallback,
                                 this));
  Config::Connect ("/NodeList/*/DeviceList/*/LteUeRrc/ConnectionTimeout",
                   MakeCallback (&LteRrcConnectionEstablishmentTestCase::ConnectionTimeoutCallback,
                                 this));

  Simulator::Stop (MilliSeconds (tmax + 1));

  Simulator::Run ();

  Simulator::Destroy ();

}

void
LteRrcConnectionEstablishmentTestCase::Connect (Ptr<NetDevice> ueDevice, Ptr<NetDevice> enbDevice)
{
  NS_LOG_FUNCTION (this);
  m_lteHelper->Attach (ueDevice, enbDevice);

  for (uint32_t b = 0; b < m_nBearers; ++b)
    {
      enum EpsBearer::Qci q = EpsBearer::NGBR_VIDEO_TCP_DEFAULT;
      EpsBearer bearer (q);
      m_lteHelper->ActivateDataRadioBearer (ueDevice, bearer);
    }
}

void
LteRrcConnectionEstablishmentTestCase::CheckConnected (Ptr<NetDevice> ueDevice, Ptr<NetDevice> enbDevice)
{
  Ptr<LteUeNetDevice> ueLteDevice = ueDevice->GetObject<LteUeNetDevice> ();
  Ptr<LteUeRrc> ueRrc = ueLteDevice->GetRrc ();
  const uint64_t imsi = ueLteDevice->GetImsi ();
  const uint16_t rnti = ueRrc->GetRnti ();
  NS_LOG_FUNCTION (this << imsi << rnti);
  NS_ASSERT_MSG (m_isConnectionEstablished.find (imsi) != m_isConnectionEstablished.end (),
                 "Invalid IMSI " << imsi);

  if (!m_admitRrcConnectionRequest)
    {
      NS_TEST_ASSERT_MSG_EQ (m_isConnectionEstablished[imsi], false,
                             "Connection with RNTI " << rnti << " should have been rejected");
      return;
    }

  /*
   * Verifying UE state in UE RRC. Try to increase the test case duration if
   * the following checks.
   */
  NS_TEST_ASSERT_MSG_EQ (m_isConnectionEstablished[imsi], true,
                         "RNTI " << rnti << " fails to establish connection");
  NS_TEST_ASSERT_MSG_EQ (ueRrc->GetState (), LteUeRrc::CONNECTED_NORMALLY,
                         "RNTI " << rnti << " is not at CONNECTED_NORMALLY state");

  // Verifying UE context state in eNodeB RRC.

  Ptr<LteEnbNetDevice> enbLteDevice = enbDevice->GetObject<LteEnbNetDevice> ();
  Ptr<LteEnbRrc> enbRrc = enbLteDevice->GetRrc ();
  const bool hasContext = enbRrc->HasUeManager (rnti);

  if (hasContext)
    {
      Ptr<UeManager> ueManager = enbRrc->GetUeManager (rnti);
      NS_ASSERT (ueManager != 0);
      NS_TEST_ASSERT_MSG_EQ (ueManager->GetState (),
                             UeManager::CONNECTED_NORMALLY,
                             "The context of RNTI " << rnti << " is in invalid state");
    }
  else
    {
       NS_LOG_WARN (this << " RNTI " << rnti << " thinks that it has"
                         << " established connection but the eNodeB thinks"
                         << " that the UE has failed on connection setup.");
       /*
        * The standard specifies that this case would exceed the maximum
        * retransmission limit at UE RLC (SRB1), which will then trigger an RLF.
        * However, this behaviour is not implemented yet.
        */
    }

  // Verifying other attributes on both sides.

  uint16_t ueCellId = ueRrc->GetCellId ();
  uint16_t enbCellId = enbLteDevice->GetCellId ();
  uint16_t ueImsi = ueLteDevice->GetImsi ();

  uint8_t ueDlBandwidth = ueRrc->GetDlBandwidth ();
  uint8_t enbDlBandwidth = enbLteDevice->GetDlBandwidth ();
  uint8_t ueUlBandwidth = ueRrc->GetUlBandwidth ();
  uint8_t enbUlBandwidth = enbLteDevice->GetUlBandwidth ();
  uint8_t ueDlEarfcn = ueRrc->GetDlEarfcn ();
  uint8_t enbDlEarfcn = enbLteDevice->GetDlEarfcn ();
  uint8_t ueUlEarfcn = ueRrc->GetUlEarfcn ();
  uint8_t enbUlEarfcn = enbLteDevice->GetUlEarfcn ();

  NS_TEST_ASSERT_MSG_EQ (ueCellId, enbCellId, "inconsistent CellId");
  NS_TEST_ASSERT_MSG_EQ (ueDlBandwidth, enbDlBandwidth, "inconsistent DlBandwidth");
  NS_TEST_ASSERT_MSG_EQ (ueUlBandwidth, enbUlBandwidth, "inconsistent UlBandwidth");
  NS_TEST_ASSERT_MSG_EQ (ueDlEarfcn, enbDlEarfcn, "inconsistent DlEarfcn");
  NS_TEST_ASSERT_MSG_EQ (ueUlEarfcn, enbUlEarfcn, "inconsistent UlEarfcn");

  if (hasContext)
    {
      Ptr<UeManager> ueManager = enbRrc->GetUeManager (rnti);
      NS_ASSERT (ueManager != 0);
      UeManager::State state = ueManager->GetState ();
      uint16_t enbImsi = ueManager->GetImsi ();
      NS_TEST_ASSERT_MSG_EQ (ueImsi, enbImsi, "inconsistent Imsi");

      if (state == UeManager::CONNECTED_NORMALLY)
        {
          ObjectMapValue enbDataRadioBearerMapValue;
          ueManager->GetAttribute ("DataRadioBearerMap", enbDataRadioBearerMapValue);
          NS_TEST_ASSERT_MSG_EQ (enbDataRadioBearerMapValue.GetN (), m_nBearers, "wrong num bearers at eNB");
          ObjectMapValue ueDataRadioBearerMapValue;
          ueRrc->GetAttribute ("DataRadioBearerMap", ueDataRadioBearerMapValue);
          NS_TEST_ASSERT_MSG_EQ (ueDataRadioBearerMapValue.GetN (), m_nBearers, "wrong num bearers at UE");

          ObjectMapValue::Iterator enbBearerIt = enbDataRadioBearerMapValue.Begin ();
          ObjectMapValue::Iterator ueBearerIt = ueDataRadioBearerMapValue.Begin ();
          while (enbBearerIt != enbDataRadioBearerMapValue.End ()
                 && ueBearerIt != ueDataRadioBearerMapValue.End ())
            {
              Ptr<LteDataRadioBearerInfo> enbDrbInfo = enbBearerIt->second->GetObject<LteDataRadioBearerInfo> ();
              Ptr<LteDataRadioBearerInfo> ueDrbInfo = ueBearerIt->second->GetObject<LteDataRadioBearerInfo> ();
              //NS_TEST_ASSERT_MSG_EQ (enbDrbInfo->m_epsBearer, ueDrbInfo->m_epsBearer, "epsBearer differs");
              NS_TEST_ASSERT_MSG_EQ ((uint32_t) enbDrbInfo->m_epsBearerIdentity, (uint32_t) ueDrbInfo->m_epsBearerIdentity, "epsBearerIdentity differs");
              NS_TEST_ASSERT_MSG_EQ ((uint32_t) enbDrbInfo->m_drbIdentity, (uint32_t) ueDrbInfo->m_drbIdentity, "drbIdentity differs");
              //NS_TEST_ASSERT_MSG_EQ (enbDrbInfo->m_rlcConfig, ueDrbInfo->m_rlcConfig, "rlcConfig differs");
              NS_TEST_ASSERT_MSG_EQ ((uint32_t) enbDrbInfo->m_logicalChannelIdentity, (uint32_t) ueDrbInfo->m_logicalChannelIdentity, "logicalChannelIdentity differs");
              //NS_TEST_ASSERT_MSG_EQ (enbDrbInfo->m_logicalChannelConfig, ueDrbInfo->m_logicalChannelConfig, "logicalChannelConfig differs");

              ++enbBearerIt;
              ++ueBearerIt;
            }

          NS_ASSERT_MSG (enbBearerIt == enbDataRadioBearerMapValue.End (), "too many bearers at eNB");
          NS_ASSERT_MSG (ueBearerIt == ueDataRadioBearerMapValue.End (), "too many bearers at UE");
        }
    }
}

void
LteRrcConnectionEstablishmentTestCase::CheckNotConnected (Ptr<NetDevice> ueDevice, Ptr<NetDevice> enbDevice)
{
  Ptr<LteUeNetDevice> ueLteDevice = ueDevice->GetObject<LteUeNetDevice> ();
  Ptr<LteUeRrc> ueRrc = ueLteDevice->GetRrc ();
  const uint64_t imsi = ueLteDevice->GetImsi ();
  const uint16_t rnti = ueRrc->GetRnti ();
  NS_LOG_FUNCTION (this << imsi << rnti);
  NS_ASSERT_MSG (m_isConnectionEstablished.find (imsi) != m_isConnectionEstablished.end (),
                 "Invalid IMSI " << imsi);

  bool ueStateIsConnectedNormally = (LteUeRrc::CONNECTED_NORMALLY == ueRrc->GetState ());

  Ptr<LteEnbNetDevice> enbLteDevice = enbDevice->GetObject<LteEnbNetDevice> ();
  Ptr<LteEnbRrc> enbRrc = enbLteDevice->GetRrc ();
  const bool hasContext = enbRrc->HasUeManager (rnti);
  bool contextStateIsConnectedNormally = false;
  if (hasContext)
    {
      Ptr<UeManager> ueManager = enbRrc->GetUeManager (rnti);
      NS_ASSERT (ueManager != 0);
      contextStateIsConnectedNormally = (UeManager::CONNECTED_NORMALLY == ueManager->GetState ());
    }
  NS_TEST_ASSERT_MSG_EQ ((!m_isConnectionEstablished[imsi]
                          || !ueStateIsConnectedNormally
                          || !hasContext
                          || !contextStateIsConnectedNormally),
                         true,
                         "it should not happen that connection is completed both at the UE and at the eNB side");
}

void
LteRrcConnectionEstablishmentTestCase::ConnectionEstablishedCallback (
    std::string context, uint64_t imsi, uint16_t cellId, uint16_t rnti)
{
  NS_LOG_FUNCTION (this << imsi << cellId);
  m_isConnectionEstablished[imsi] = true;
}


void
LteRrcConnectionEstablishmentTestCase::ConnectionTimeoutCallback (
    std::string context, uint64_t imsi, uint16_t cellId, uint16_t rnti,
    uint8_t connEstFailCount)
{
  NS_LOG_FUNCTION (this << imsi << cellId);
}



class LteRrcConnectionEstablishmentErrorTestCase
  : public LteRrcConnectionEstablishmentTestCase
{
public:
  LteRrcConnectionEstablishmentErrorTestCase (Time jumpAwayTime,
                                              std::string description = "");
protected:
  virtual void DoRun (void);

private:
  void JumpAway ();
  void JumpBack ();

  Time m_jumpAwayTime; 
  Ptr<MobilityModel> m_ueMobility; 
};


LteRrcConnectionEstablishmentErrorTestCase::LteRrcConnectionEstablishmentErrorTestCase (
  Time jumpAwayTime, std::string description)
  : LteRrcConnectionEstablishmentTestCase (1, 1, 0, 0, 1, true, false, true,
                                           description),
    m_jumpAwayTime (jumpAwayTime)
{
  NS_LOG_FUNCTION (this << GetName ());
}


void
LteRrcConnectionEstablishmentErrorTestCase::DoRun ()
{
  NS_LOG_FUNCTION (this << GetName ());
  Config::Reset ();

  if (m_nUes < 25)
    {
      Config::SetDefault ("ns3::LteEnbRrc::SrsPeriodicity", UintegerValue (40));
    }
  else if (m_nUes < 60)
    {
      Config::SetDefault ("ns3::LteEnbRrc::SrsPeriodicity", UintegerValue (80));
    }
  else if (m_nUes < 120)
    {
      Config::SetDefault ("ns3::LteEnbRrc::SrsPeriodicity", UintegerValue (160));
    }
  else
    {
      Config::SetDefault ("ns3::LteEnbRrc::SrsPeriodicity", UintegerValue (320));
    }

  // normal code
  m_lteHelper = CreateObject<LteHelper> ();
  m_lteHelper->SetAttribute ("UseIdealRrc", BooleanValue (m_useIdealRrc));

  NodeContainer enbNodes;
  NodeContainer ueNodes;


  enbNodes.Create (4);
  ueNodes.Create (1);

  MobilityHelper mobility;
  mobility.Install (ueNodes); // UE position at (0, 0, 0)
  m_ueMobility = ueNodes.Get (0)->GetObject<MobilityModel> ();

  Ptr<ListPositionAllocator> enbPosition = CreateObject<ListPositionAllocator> ();
  enbPosition->Add (Vector (0, 0, 0));
  enbPosition->Add (Vector (100.0, 0, 0));
  enbPosition->Add (Vector (0, 100.0, 0));
  enbPosition->Add (Vector (100.0, 100.0, 0));
  mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
  mobility.SetPositionAllocator (enbPosition);
  mobility.Install (enbNodes);

  int64_t stream = 1;
  NetDeviceContainer enbDevs;
  enbDevs = m_lteHelper->InstallEnbDevice (enbNodes);
  stream += m_lteHelper->AssignStreams (enbDevs, stream);

  NetDeviceContainer ueDevs;
  ueDevs = m_lteHelper->InstallUeDevice (ueNodes);
  stream += m_lteHelper->AssignStreams (ueDevs, stream);

  // custom code used for testing purposes
  // instead of lteHelper->Attach () and lteHelper->ActivateXxx

  // Set AdmitConnectionRequest attribute
  for (NetDeviceContainer::Iterator it = enbDevs.Begin ();
       it != enbDevs.End ();
       ++it)
    {
      Ptr<LteEnbRrc> enbRrc = (*it)->GetObject<LteEnbNetDevice> ()->GetRrc ();
      enbRrc->SetAttribute ("AdmitRrcConnectionRequest",
                            BooleanValue (m_admitRrcConnectionRequest));
    }


  uint32_t i = 0;
  uint32_t tmax = 0;
  for (NetDeviceContainer::Iterator it = ueDevs.Begin (); it != ueDevs.End (); ++it)
    {
      Ptr<NetDevice> ueDevice = *it;
      Ptr<NetDevice> enbDevice = enbDevs.Get (0);
      Ptr<LteUeNetDevice> ueLteDevice = ueDevice->GetObject<LteUeNetDevice> ();

      uint32_t tc = m_tConnBase + m_tConnIncrPerUe * i; // time connection start
      uint32_t tcc = tc + m_delayConnEnd; // time check connection completed;
      uint32_t td =  tcc + m_delayDiscStart; // time disconnect start
      uint32_t tcd = td + m_delayDiscEnd; // time check disconnection completed
      tmax = std::max (tmax, tcd);

      // trick to resolve overloading
      //void (LteHelper::* overloadedAttachFunctionPointer) (Ptr<NetDevice>, Ptr<NetDevice>) = &LteHelper::Attach;
      //Simulator::Schedule (MilliSeconds (tc), overloadedAttachFunctionPointer, lteHelper, *it, enbDevice);
      Simulator::Schedule (MilliSeconds (tc), &LteRrcConnectionEstablishmentErrorTestCase::Connect, this, ueDevice, enbDevice);

      // disconnection not supported yet

      uint64_t imsi = ueLteDevice->GetImsi ();
      m_isConnectionEstablished[imsi] = false;

      ++i;
    }

  // Connect to trace sources in UEs
  Config::Connect ("/NodeList/*/DeviceList/*/LteUeRrc/ConnectionEstablished",
                   MakeCallback (&LteRrcConnectionEstablishmentErrorTestCase::ConnectionEstablishedCallback,
                                 this));
  Config::Connect ("/NodeList/*/DeviceList/*/LteUeRrc/ConnectionTimeout",
                   MakeCallback (&LteRrcConnectionEstablishmentErrorTestCase::ConnectionTimeoutCallback,
                                 this));


  Simulator::Schedule (m_jumpAwayTime,
                       &LteRrcConnectionEstablishmentErrorTestCase::JumpAway,
                       this);
  Simulator::Schedule (m_jumpAwayTime + MilliSeconds (99),
                       &LteRrcConnectionEstablishmentErrorTestCase::CheckNotConnected,
                       this, ueDevs.Get (0), enbDevs.Get (0));
  Simulator::Schedule (m_jumpAwayTime + MilliSeconds (100),
                       &LteRrcConnectionEstablishmentErrorTestCase::JumpBack,
                       this);

  Simulator::Stop (MilliSeconds (tmax + 1));

  Simulator::Run ();

  Simulator::Destroy ();

}


void
LteRrcConnectionEstablishmentErrorTestCase::JumpAway ()
{
  NS_LOG_FUNCTION (this);
  // move to a really far away location so that transmission errors occur
  m_ueMobility->SetPosition (Vector (100000.0, 100000.0, 0.0));
}


void
LteRrcConnectionEstablishmentErrorTestCase::JumpBack ()
{
  NS_LOG_FUNCTION (this);
  m_ueMobility->SetPosition (Vector (0.0, 0.0, 0.0));
}


class LteRrcTestSuite : public TestSuite
{
public:
  LteRrcTestSuite ();
};


LteRrcTestSuite::LteRrcTestSuite ()
  : TestSuite ("lte-rrc", SYSTEM)
{
//  LogComponentEnableAll (LOG_PREFIX_ALL);
//  LogComponentEnable ("LteRrcTest", LOG_LEVEL_ALL);
//  LogComponentEnable ("LteEnbRrc", LOG_INFO);
//  LogComponentEnable ("LteUeRrc", LOG_INFO);

  NS_LOG_FUNCTION (this);

  for (uint32_t useIdealRrc = 0; useIdealRrc <= 1; ++useIdealRrc)
    {
      //         <----- all times in ms ----------------->

      //                                                     nUes      tConnBase            delayDiscStart         useIdealRrc
      //                                                        nBearers       tConnIncrPerUe       errorExpected               admitRrcConnectionRequest
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  1,     0,      0,           0,           1, false, useIdealRrc, true), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  1,     0,    100,           0,           1, false, useIdealRrc, true), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  1,     1,      0,           0,           1, false, useIdealRrc, true), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  1,     1,    100,           0,           1, false, useIdealRrc, true), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  1,     2,      0,           0,           1, false, useIdealRrc, true), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  1,     2,    100,           0,           1, false, useIdealRrc, true), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  2,     0,     20,           0,           1, false, useIdealRrc, true), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  2,     0,     20,          10,           1, false, useIdealRrc, true), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  2,     0,     20,         100,           1, false, useIdealRrc, true), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  2,     1,     20,           0,           1, false, useIdealRrc, true), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  2,     1,     20,          10,           1, false, useIdealRrc, true), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  2,     1,     20,         100,           1, false, useIdealRrc, true), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  2,     2,     20,           0,           1, false, useIdealRrc, true), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  2,     2,     20,          10,           1, false, useIdealRrc, true), TestCase::QUICK);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  2,     2,     20,         100,           1, false, useIdealRrc, true), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  3,     0,     20,           0,           1, false, useIdealRrc, true), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  4,     0,     20,           0,           1, false, useIdealRrc, true), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  4,     0,     20,         300,           1, false, useIdealRrc, true), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase ( 20,     0,     10,           1,           1, false, useIdealRrc, true), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase ( 50,     0,      0,           0,           1, false, useIdealRrc, true), TestCase::EXTENSIVE);

      // Test cases to check admitRrcConnectionRequest=false
      //                                                     nUes      tConnBase            delayDiscStart         useIdealRrc
      //                                                        nBearers       tConnIncrPerUe       errorExpected               admitRrcConnectionRequest
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  1,     0,      0,           0,           1, false, useIdealRrc, false), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  1,     2,    100,           0,           1, false, useIdealRrc, false), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  2,     0,     20,           0,           1, false, useIdealRrc, false), TestCase::EXTENSIVE);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  2,     1,     20,           0,           1, false, useIdealRrc, false), TestCase::QUICK);
      AddTestCase (new LteRrcConnectionEstablishmentTestCase (  3,     0,     20,           0,           1, false, useIdealRrc, false), TestCase::EXTENSIVE);
    }

  // Test cases with transmission error
  AddTestCase (new LteRrcConnectionEstablishmentErrorTestCase (
                   Seconds (0.020214),
                   "failure at RRC Connection Request"),
               TestCase::QUICK);
  AddTestCase (new LteRrcConnectionEstablishmentErrorTestCase (
                   Seconds (0.025),
                   "failure at RRC Connection Setup"),
               TestCase::QUICK);
  /*
   * With RLF implementation we now do support the Idle mode,
   * thus it solve Bug 1762 Comment #25.
   */
   AddTestCase (new LteRrcConnectionEstablishmentErrorTestCase (
                    Seconds (0.030),
                    "failure at RRC Connection Setup Complete"),
                TestCase::QUICK);

}

static LteRrcTestSuite g_lteRrcTestSuiteInstance;