lte-enb-phy.cc

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2010 TELEMATICS LAB, DEE - Politecnico di Bari
 *
 * 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: Giuseppe Piro  <g.piro@poliba.it>
 *         Marco Miozzo <mmiozzo@cttc.es>
 */

#include <ns3/object-factory.h>
#include <ns3/log.h>
#include <cfloat>
#include <cmath>
#include <ns3/simulator.h>
#include <ns3/attribute-accessor-helper.h>
#include <ns3/double.h>


#include "lte-enb-phy.h"
#include "lte-ue-phy.h"
#include "lte-net-device.h"
#include "lte-spectrum-value-helper.h"
#include "lte-control-messages.h"
#include "lte-enb-net-device.h"
#include "lte-ue-rrc.h"
#include "lte-enb-mac.h"
#include <ns3/lte-common.h>
#include <ns3/lte-vendor-specific-parameters.h>

// WILD HACK for the inizialization of direct eNB-UE ctrl messaging
#include <ns3/node-list.h>
#include <ns3/node.h>
#include <ns3/lte-ue-net-device.h>
#include <ns3/pointer.h>

NS_LOG_COMPONENT_DEFINE ("LteEnbPhy");

namespace ns3 {

NS_OBJECT_ENSURE_REGISTERED (LteEnbPhy);

// duration of the data part of a subframe in DL
// = 0.001 / 14 * 11 (fixed to 11 symbols) -1ns as margin to avoid overlapping simulator events
static const Time DL_DATA_DURATION = NanoSeconds (785714 -1);

//  delay from subframe start to transmission of the data in DL 
// = 0.001 / 14 * 3 (ctrl fixed to 3 symbols)
static const Time DL_CTRL_DELAY_FROM_SUBFRAME_START = NanoSeconds (214286);

// member SAP forwarders


class EnbMemberLteEnbPhySapProvider : public LteEnbPhySapProvider
{
public:
  EnbMemberLteEnbPhySapProvider (LteEnbPhy* phy);

  // inherited from LteEnbPhySapProvider
  virtual void SendMacPdu (Ptr<Packet> p);
  virtual void SetBandwidth (uint8_t ulBandwidth, uint8_t dlBandwidth);
  virtual void SetCellId (uint16_t cellId);
  virtual void SendLteControlMessage (Ptr<LteControlMessage> msg);
  virtual uint8_t GetMacChTtiDelay ();
  

private:
  LteEnbPhy* m_phy;
};

EnbMemberLteEnbPhySapProvider::EnbMemberLteEnbPhySapProvider (LteEnbPhy* phy) : m_phy (phy)
{

}

void
EnbMemberLteEnbPhySapProvider::SendMacPdu (Ptr<Packet> p)
{
  m_phy->DoSendMacPdu (p);
}

void
EnbMemberLteEnbPhySapProvider::SetBandwidth (uint8_t ulBandwidth, uint8_t dlBandwidth)
{
  m_phy->DoSetBandwidth (ulBandwidth, dlBandwidth);
}

void
EnbMemberLteEnbPhySapProvider::SetCellId (uint16_t cellId)
{
  m_phy->DoSetCellId (cellId);
}

void
EnbMemberLteEnbPhySapProvider::SendLteControlMessage (Ptr<LteControlMessage> msg)
{
  m_phy->DoSendLteControlMessage (msg);
}

uint8_t
EnbMemberLteEnbPhySapProvider::GetMacChTtiDelay ()
{
  return (m_phy->DoGetMacChTtiDelay ());
}


// generic LteEnbPhy methods



LteEnbPhy::LteEnbPhy ()
{
  NS_LOG_FUNCTION (this);
  NS_FATAL_ERROR ("This constructor should not be called");
}

LteEnbPhy::LteEnbPhy (Ptr<LteSpectrumPhy> dlPhy, Ptr<LteSpectrumPhy> ulPhy)
  : LtePhy (dlPhy, ulPhy),
    m_enbPhySapUser (0),
    m_enbCphySapUser (0),
    m_nrFrames (0),
    m_nrSubFrames (0),
    m_srsPeriodicity (0),
    m_srsStartTime (Seconds (0)),
    m_currentSrsOffset (0),
    m_interferenceSampleCounter (0)
{
  m_enbPhySapProvider = new EnbMemberLteEnbPhySapProvider (this);
  m_enbCphySapProvider = new MemberLteEnbCphySapProvider<LteEnbPhy> (this);
  m_harqPhyModule = Create <LteHarqPhy> ();
  m_downlinkSpectrumPhy->SetHarqPhyModule (m_harqPhyModule);
  m_uplinkSpectrumPhy->SetHarqPhyModule (m_harqPhyModule);
  Simulator::ScheduleNow (&LteEnbPhy::StartFrame, this);
}

TypeId
LteEnbPhy::GetTypeId (void)
{
  static TypeId tid = TypeId ("ns3::LteEnbPhy")
    .SetParent<LtePhy> ()
    .AddConstructor<LteEnbPhy> ()
    .AddAttribute ("TxPower",
                   "Transmission power in dBm",
                   DoubleValue (30.0),
                   MakeDoubleAccessor (&LteEnbPhy::SetTxPower, 
                                       &LteEnbPhy::GetTxPower),
                   MakeDoubleChecker<double> ())
    .AddAttribute ("NoiseFigure",
                   "Loss (dB) in the Signal-to-Noise-Ratio due to non-idealities in the receiver."
                   " According to Wikipedia (http://en.wikipedia.org/wiki/Noise_figure), this is "
                   "\"the difference in decibels (dB) between"
                   " the noise output of the actual receiver to the noise output of an "
                   " ideal receiver with the same overall gain and bandwidth when the receivers "
                   " are connected to sources at the standard noise temperature T0.\" "
                   "In this model, we consider T0 = 290K.",
                   DoubleValue (5.0),
                   MakeDoubleAccessor (&LteEnbPhy::SetNoiseFigure, 
                                       &LteEnbPhy::GetNoiseFigure),
                   MakeDoubleChecker<double> ())
    .AddAttribute ("MacToChannelDelay",
                   "The delay in TTI units that occurs between a scheduling decision in the MAC and the actual start of the transmission by the PHY. This is intended to be used to model the latency of real PHY and MAC implementations.",
                   UintegerValue (2),
                   MakeUintegerAccessor (&LteEnbPhy::SetMacChDelay, 
                                         &LteEnbPhy::GetMacChDelay),
                   MakeUintegerChecker<uint8_t> ())
    .AddTraceSource ("ReportUeSinr",
                     "Report UEs' averaged linear SINR",
                     MakeTraceSourceAccessor (&LteEnbPhy::m_reportUeSinr))
    .AddAttribute ("UeSinrSamplePeriod",
                   "The sampling period for reporting UEs' SINR stats (default value 1)",
                   UintegerValue (1),
                   MakeUintegerAccessor (&LteEnbPhy::m_srsSamplePeriod),
                   MakeUintegerChecker<uint16_t> ())
    .AddTraceSource ("ReportInterference",
                     "Report linear interference power per PHY RB",
                     MakeTraceSourceAccessor (&LteEnbPhy::m_reportInterferenceTrace))
    .AddAttribute ("InterferenceSamplePeriod",
                   "The sampling period for reporting interference stats (default value 1)",
                   UintegerValue (1),
                   MakeUintegerAccessor (&LteEnbPhy::m_interferenceSamplePeriod),
                   MakeUintegerChecker<uint16_t> ())
    .AddTraceSource ("DlPhyTransmission",
                     "DL transmission PHY layer statistics.",
                     MakeTraceSourceAccessor (&LteEnbPhy::m_dlPhyTransmission))
    .AddAttribute ("DlSpectrumPhy",
                   "The downlink LteSpectrumPhy associated to this LtePhy",
                   TypeId::ATTR_GET,
                   PointerValue (),
                   MakePointerAccessor (&LteEnbPhy::GetDlSpectrumPhy),
                   MakePointerChecker <LteSpectrumPhy> ())
    .AddAttribute ("UlSpectrumPhy",
                   "The uplink LteSpectrumPhy associated to this LtePhy",
                   TypeId::ATTR_GET,
                   PointerValue (),
                   MakePointerAccessor (&LteEnbPhy::GetUlSpectrumPhy),
                   MakePointerChecker <LteSpectrumPhy> ())
  ;
  return tid;
}


LteEnbPhy::~LteEnbPhy ()
{
}

void
LteEnbPhy::DoDispose ()
{
  NS_LOG_FUNCTION (this);
  m_ueAttached.clear ();
  m_srsUeOffset.clear ();
  delete m_enbPhySapProvider;
  delete m_enbCphySapProvider;
  LtePhy::DoDispose ();
}

void
LteEnbPhy::DoInitialize ()
{
  NS_LOG_FUNCTION (this);
  Ptr<SpectrumValue> noisePsd = LteSpectrumValueHelper::CreateNoisePowerSpectralDensity (m_ulEarfcn, m_ulBandwidth, m_noiseFigure);
  m_uplinkSpectrumPhy->SetNoisePowerSpectralDensity (noisePsd);
  LtePhy::DoInitialize ();
}


void
LteEnbPhy::SetLteEnbPhySapUser (LteEnbPhySapUser* s)
{
  m_enbPhySapUser = s;
}

LteEnbPhySapProvider*
LteEnbPhy::GetLteEnbPhySapProvider ()
{
  return (m_enbPhySapProvider);
}

void
LteEnbPhy::SetLteEnbCphySapUser (LteEnbCphySapUser* s)
{
  NS_LOG_FUNCTION (this);
  m_enbCphySapUser = s;
}

LteEnbCphySapProvider*
LteEnbPhy::GetLteEnbCphySapProvider ()
{
  NS_LOG_FUNCTION (this);
  return (m_enbCphySapProvider);
}

void
LteEnbPhy::SetTxPower (double pow)
{
  NS_LOG_FUNCTION (this << pow);
  m_txPower = pow;
}

double
LteEnbPhy::GetTxPower () const
{
  NS_LOG_FUNCTION (this);
  return m_txPower;
}

void
LteEnbPhy::SetNoiseFigure (double nf)
{
  NS_LOG_FUNCTION (this << nf);
  m_noiseFigure = nf;
}

double
LteEnbPhy::GetNoiseFigure () const
{
  NS_LOG_FUNCTION (this);
  return m_noiseFigure;
}

void
LteEnbPhy::SetMacChDelay (uint8_t delay)
{
  NS_LOG_FUNCTION (this);
  m_macChTtiDelay = delay;
  for (int i = 0; i < m_macChTtiDelay; i++)
    {
      Ptr<PacketBurst> pb = CreateObject <PacketBurst> ();
      m_packetBurstQueue.push_back (pb);
      std::list<Ptr<LteControlMessage> > l;
      m_controlMessagesQueue.push_back (l);
      std::list<UlDciLteControlMessage> l1;
      m_ulDciQueue.push_back (l1);
    }
  for (int i = 0; i < UL_PUSCH_TTIS_DELAY; i++)
    {
      std::list<UlDciLteControlMessage> l1;
      m_ulDciQueue.push_back (l1);
    }
}

uint8_t
LteEnbPhy::GetMacChDelay (void) const
{
  return (m_macChTtiDelay);
}

Ptr<LteSpectrumPhy>
LteEnbPhy::GetDlSpectrumPhy () const
{
  return m_downlinkSpectrumPhy;
}

Ptr<LteSpectrumPhy>
LteEnbPhy::GetUlSpectrumPhy () const
{
  return m_uplinkSpectrumPhy;
}

bool
LteEnbPhy::AddUePhy (uint16_t rnti)
{
  NS_LOG_FUNCTION (this << rnti);
  std::set <uint16_t>::iterator it;
  it = m_ueAttached.find (rnti);
  if (it == m_ueAttached.end ())
    {
      m_ueAttached.insert (rnti);
      return (true);
    }
  else
    {
      NS_LOG_ERROR ("UE already attached");
      return (false);
    }
}

bool
LteEnbPhy::DeleteUePhy (uint16_t rnti)
{
  NS_LOG_FUNCTION (this << rnti);
  std::set <uint16_t>::iterator it;
  it = m_ueAttached.find (rnti);
  if (it == m_ueAttached.end ())
    {
      NS_LOG_ERROR ("UE not attached");
      return (false);
    }
  else
    {
      m_ueAttached.erase (it);
      return (true);
    }
}



void
LteEnbPhy::DoSendMacPdu (Ptr<Packet> p)
{
  NS_LOG_FUNCTION (this);
  SetMacPdu (p);
}

uint8_t
LteEnbPhy::DoGetMacChTtiDelay ()
{
  return (m_macChTtiDelay);
}


void
LteEnbPhy::PhyPduReceived (Ptr<Packet> p)
{
  NS_LOG_FUNCTION (this);
  m_enbPhySapUser->ReceivePhyPdu (p);
}

void
LteEnbPhy::SetDownlinkSubChannels (std::vector<int> mask)
{
  NS_LOG_FUNCTION (this);
  m_listOfDownlinkSubchannel = mask;
  Ptr<SpectrumValue> txPsd = CreateTxPowerSpectralDensity ();
  m_downlinkSpectrumPhy->SetTxPowerSpectralDensity (txPsd);
}

std::vector<int>
LteEnbPhy::GetDownlinkSubChannels (void)
{
  NS_LOG_FUNCTION (this);
  return m_listOfDownlinkSubchannel;
}

Ptr<SpectrumValue>
LteEnbPhy::CreateTxPowerSpectralDensity ()
{
  NS_LOG_FUNCTION (this);

  Ptr<SpectrumValue> psd = LteSpectrumValueHelper::CreateTxPowerSpectralDensity (m_dlEarfcn, m_dlBandwidth, m_txPower, GetDownlinkSubChannels ());

  return psd;
}


void
LteEnbPhy::CalcChannelQualityForUe (std::vector <double> sinr, Ptr<LteSpectrumPhy> ue)
{
  NS_LOG_FUNCTION (this);
}


void
LteEnbPhy::DoSendLteControlMessage (Ptr<LteControlMessage> msg)
{
  NS_LOG_FUNCTION (this << msg);
  // queues the message (wait for MAC-PHY delay)
  SetControlMessages (msg);
}



void
LteEnbPhy::ReceiveLteControlMessage (Ptr<LteControlMessage> msg)
{
  NS_FATAL_ERROR ("Obsolete function");
  NS_LOG_FUNCTION (this << msg);
  m_enbPhySapUser->ReceiveLteControlMessage (msg);
}

void
LteEnbPhy::ReceiveLteControlMessageList (std::list<Ptr<LteControlMessage> > msgList)
{
  NS_LOG_FUNCTION (this);
  std::list<Ptr<LteControlMessage> >::iterator it;
  for (it = msgList.begin (); it != msgList.end(); it++)
    {
      switch ((*it)->GetMessageType ())
        {
        case LteControlMessage::RACH_PREAMBLE:
          {
            Ptr<RachPreambleLteControlMessage> rachPreamble = DynamicCast<RachPreambleLteControlMessage> (*it);
            m_enbPhySapUser->ReceiveRachPreamble (rachPreamble->GetRapId ());
          }
          break;
        case LteControlMessage::DL_CQI:
          {
            Ptr<DlCqiLteControlMessage> dlcqiMsg = DynamicCast<DlCqiLteControlMessage> (*it);
            CqiListElement_s dlcqi = dlcqiMsg->GetDlCqi ();
            // check whether the UE is connected
            if (m_ueAttached.find (dlcqi.m_rnti) != m_ueAttached.end ())
              {
                m_enbPhySapUser->ReceiveLteControlMessage (*it);
              }
          }
          break;
        case LteControlMessage::BSR:
          {
            Ptr<BsrLteControlMessage> bsrMsg = DynamicCast<BsrLteControlMessage> (*it);
            MacCeListElement_s bsr = bsrMsg->GetBsr ();
            // check whether the UE is connected
            if (m_ueAttached.find (bsr.m_rnti) != m_ueAttached.end ())
              {
                m_enbPhySapUser->ReceiveLteControlMessage (*it);
              }
          }
          break;
        case LteControlMessage::DL_HARQ:
          {
            Ptr<DlHarqFeedbackLteControlMessage> dlharqMsg = DynamicCast<DlHarqFeedbackLteControlMessage> (*it);
            DlInfoListElement_s dlharq = dlharqMsg->GetDlHarqFeedback ();
            // check whether the UE is connected
            if (m_ueAttached.find (dlharq.m_rnti) != m_ueAttached.end ())
              {
                m_enbPhySapUser->ReceiveLteControlMessage (*it);
              }
          }
          break;          
        default:
          NS_FATAL_ERROR ("Unexpected LteControlMessage type");
          break;
        }
    }
}



void
LteEnbPhy::StartFrame (void)
{
  NS_LOG_FUNCTION (this);

  ++m_nrFrames;
  NS_LOG_INFO ("-----frame " << m_nrFrames << "-----");
  m_nrSubFrames = 0;

  // send MIB at beginning of every frame
  m_mib.systemFrameNumber = m_nrSubFrames;
  Ptr<MibLteControlMessage> mibMsg = Create<MibLteControlMessage> ();
  mibMsg->SetMib (m_mib);
  m_controlMessagesQueue.at (0).push_back (mibMsg);

  StartSubFrame ();
}


void
LteEnbPhy::StartSubFrame (void)
{
  NS_LOG_FUNCTION (this);

  ++m_nrSubFrames;

  /*
   * Send SIB1 at 6th subframe of every odd-numbered radio frame. This is
   * equivalent with Section 5.2.1.2 of 3GPP TS 36.331, where it is specified
   * "repetitions are scheduled in subframe #5 of all other radio frames for
   * which SFN mod 2 = 0," except that 3GPP counts frames and subframes starting
   * from 0, while ns-3 counts starting from 1.
   */
  if ((m_nrSubFrames == 6) && ((m_nrFrames % 2) == 1))
    {
      Ptr<Sib1LteControlMessage> msg = Create<Sib1LteControlMessage> ();
      msg->SetSib1 (m_sib1);
      m_controlMessagesQueue.at (0).push_back (msg);
    }

  if (m_srsPeriodicity>0)
    { 
      // might be 0 in case the eNB has no UEs attached
        NS_ASSERT_MSG (m_nrFrames > 1, "the SRS index check code assumes that frameNo starts at 1");
      NS_ASSERT_MSG (m_nrSubFrames > 0 && m_nrSubFrames <= 10, "the SRS index check code assumes that subframeNo starts at 1");
      m_currentSrsOffset = (((m_nrFrames-1)*10 + (m_nrSubFrames-1)) % m_srsPeriodicity);
    }
  NS_LOG_INFO ("-----sub frame " << m_nrSubFrames << "-----");
  m_harqPhyModule->SubframeIndication (m_nrFrames, m_nrSubFrames);
  
  // update info on TB to be received
  std::list<UlDciLteControlMessage> uldcilist = DequeueUlDci ();
  std::list<UlDciLteControlMessage>::iterator dciIt = uldcilist.begin ();
  NS_LOG_DEBUG (this << " eNB Expected TBs " << uldcilist.size ());
  for (dciIt = uldcilist.begin (); dciIt!=uldcilist.end (); dciIt++)
    {
      std::set <uint16_t>::iterator it2;
      it2 = m_ueAttached.find ((*dciIt).GetDci ().m_rnti);
      
      if (it2 == m_ueAttached.end ())
        {
          NS_LOG_ERROR ("UE not attached");
        }
      else
        {
          // send info of TB to LteSpectrumPhy 
          // translate to allocation map
          std::vector <int> rbMap;
          for (int i = (*dciIt).GetDci ().m_rbStart; i < (*dciIt).GetDci ().m_rbStart + (*dciIt).GetDci ().m_rbLen; i++)
            {
              rbMap.push_back (i);
            }
          m_uplinkSpectrumPhy->AddExpectedTb ((*dciIt).GetDci ().m_rnti, (*dciIt).GetDci ().m_ndi, (*dciIt).GetDci ().m_tbSize, (*dciIt).GetDci ().m_mcs, rbMap, 0 /* always SISO*/, 0 /* no HARQ proc id in UL*/, 0 /*evaluated by LteSpectrumPhy*/, false /* UL*/);
          if ((*dciIt).GetDci ().m_ndi==1)
            {
              NS_LOG_DEBUG (this << " RNTI " << (*dciIt).GetDci ().m_rnti << " NEW TB");
            }
          else
            {
              NS_LOG_DEBUG (this << " RNTI " << (*dciIt).GetDci ().m_rnti << " HARQ RETX");
            }
        }
    }

  // process the current burst of control messages
  std::list<Ptr<LteControlMessage> > ctrlMsg = GetControlMessages ();
  m_dlDataRbMap.clear ();
  if (ctrlMsg.size () > 0)
    {
      std::list<Ptr<LteControlMessage> >::iterator it;
      it = ctrlMsg.begin ();
      while (it != ctrlMsg.end ())
        {
          Ptr<LteControlMessage> msg = (*it);
          if (msg->GetMessageType () == LteControlMessage::DL_DCI)
            {
              Ptr<DlDciLteControlMessage> dci = DynamicCast<DlDciLteControlMessage> (msg);
              // get the tx power spectral density according to DL-DCI(s)
              // translate the DCI to Spectrum framework
              uint32_t mask = 0x1;
              for (int i = 0; i < 32; i++)
                {
                  if (((dci->GetDci ().m_rbBitmap & mask) >> i) == 1)
                    {
                      for (int k = 0; k < GetRbgSize (); k++)
                        {
                          m_dlDataRbMap.push_back ((i * GetRbgSize ()) + k);
                          //NS_LOG_DEBUG(this << " [enb]DL-DCI allocated PRB " << (i*GetRbgSize()) + k);
                        }
                    }
                  mask = (mask << 1);
                }
              // fire trace of DL Tx PHY stats
              for (uint8_t i = 0; i < dci->GetDci ().m_mcs.size (); i++)
                {
                  PhyTransmissionStatParameters params;
                  params.m_cellId = m_cellId;
                  params.m_imsi = 0; // it will be set by DlPhyTransmissionCallback in LteHelper
                  params.m_timestamp = Simulator::Now ().GetMilliSeconds ();
                  params.m_rnti = dci->GetDci ().m_rnti;
                  params.m_txMode = 0; // TBD
                  params.m_layer = i;
                  params.m_mcs = dci->GetDci ().m_mcs.at (i);
                  params.m_size = dci->GetDci ().m_tbsSize.at (i);
                  params.m_rv = dci->GetDci ().m_rv.at (i);
                  params.m_ndi = dci->GetDci ().m_ndi.at (i);
                  m_dlPhyTransmission (params);
                }
              
            }
          else if (msg->GetMessageType () == LteControlMessage::UL_DCI)
            {
              Ptr<UlDciLteControlMessage> dci = DynamicCast<UlDciLteControlMessage> (msg);
              QueueUlDci (*dci);
            }
          else if (msg->GetMessageType () == LteControlMessage::RAR)
            {
              Ptr<RarLteControlMessage> rarMsg = DynamicCast<RarLteControlMessage> (msg);
              for (std::list<RarLteControlMessage::Rar>::const_iterator it = rarMsg->RarListBegin (); it != rarMsg->RarListEnd (); ++it)
                {
                  if (it->rarPayload.m_grant.m_ulDelay == true)
                    {
                      NS_FATAL_ERROR (" RAR delay is not yet implemented");
                    }
                  UlGrant_s ulGrant = it->rarPayload.m_grant;
                  // translate the UL grant in a standard UL-DCI and queue it
                  UlDciListElement_s dci;
                  dci.m_rnti = ulGrant.m_rnti;
                  dci.m_rbStart = ulGrant.m_rbStart;
                  dci.m_rbLen = ulGrant.m_rbLen;
                  dci.m_tbSize = ulGrant.m_tbSize;
                  dci.m_mcs = ulGrant.m_mcs;
                  dci.m_hopping = ulGrant.m_hopping;
                  dci.m_tpc = ulGrant.m_tpc;
                  dci.m_cqiRequest = ulGrant.m_cqiRequest;
                  dci.m_ndi = 1;
                  UlDciLteControlMessage msg;
                  msg.SetDci (dci);
                  QueueUlDci (msg);
                }
            }
          it++;

        }
    }
    
  SendControlChannels (ctrlMsg);
  
  // send data frame
  Ptr<PacketBurst> pb = GetPacketBurst ();
  if (pb)
    {
      Simulator::Schedule (DL_CTRL_DELAY_FROM_SUBFRAME_START, // ctrl frame fixed to 3 symbols
                       &LteEnbPhy::SendDataChannels,
                       this,pb);
    }

  // trigger the MAC
  m_enbPhySapUser->SubframeIndication (m_nrFrames, m_nrSubFrames);

  Simulator::Schedule (Seconds (GetTti ()),
                       &LteEnbPhy::EndSubFrame,
                       this);

}

void
LteEnbPhy::SendControlChannels (std::list<Ptr<LteControlMessage> > ctrlMsgList)
{
  NS_LOG_FUNCTION (this << " eNB " << m_cellId << " start tx ctrl frame");
  // set the current tx power spectral density (full bandwidth)
  std::vector <int> dlRb;
  for (uint8_t i = 0; i < m_dlBandwidth; i++)
    {
      dlRb.push_back (i);
    }
  SetDownlinkSubChannels (dlRb);
  NS_LOG_LOGIC (this << " eNB start TX CTRL");
  bool pss = false;
  if ((m_nrSubFrames == 1) || (m_nrSubFrames == 6))
    {
      pss = true;
    }
  m_downlinkSpectrumPhy->StartTxDlCtrlFrame (ctrlMsgList, pss);
  
}

void
LteEnbPhy::SendDataChannels (Ptr<PacketBurst> pb)
{
  // set the current tx power spectral density
  SetDownlinkSubChannels (m_dlDataRbMap);
  // send the current burts of packets
  NS_LOG_LOGIC (this << " eNB start TX DATA");
  std::list<Ptr<LteControlMessage> > ctrlMsgList;
  ctrlMsgList.clear ();
  m_downlinkSpectrumPhy->StartTxDataFrame (pb, ctrlMsgList, DL_DATA_DURATION);
}


void
LteEnbPhy::EndSubFrame (void)
{
  NS_LOG_FUNCTION (this << Simulator::Now ().GetSeconds ());
  if (m_nrSubFrames == 10)
    {
      Simulator::ScheduleNow (&LteEnbPhy::EndFrame, this);
    }
  else
    {
      Simulator::ScheduleNow (&LteEnbPhy::StartSubFrame, this);
    }
}


void
LteEnbPhy::EndFrame (void)
{
  NS_LOG_FUNCTION (this << Simulator::Now ().GetSeconds ());
  Simulator::ScheduleNow (&LteEnbPhy::StartFrame, this);
}


void 
LteEnbPhy::GenerateCtrlCqiReport (const SpectrumValue& sinr)
{
  NS_LOG_FUNCTION (this << sinr << Simulator::Now () << m_srsStartTime);
  // avoid processing SRSs sent with an old SRS configuration index
  if (Simulator::Now () > m_srsStartTime)
    {
      FfMacSchedSapProvider::SchedUlCqiInfoReqParameters ulcqi = CreateSrsCqiReport (sinr);
      m_enbPhySapUser->UlCqiReport (ulcqi);
    }
}

void
LteEnbPhy::GenerateDataCqiReport (const SpectrumValue& sinr)
{
  NS_LOG_FUNCTION (this << sinr);
  FfMacSchedSapProvider::SchedUlCqiInfoReqParameters ulcqi = CreatePuschCqiReport (sinr);
  m_enbPhySapUser->UlCqiReport (ulcqi);
}

void
LteEnbPhy::ReportInterference (const SpectrumValue& interf)
{
  NS_LOG_FUNCTION (this << interf);
  Ptr<SpectrumValue> interfCopy = Create<SpectrumValue> (interf);
  m_interferenceSampleCounter++;
  if (m_interferenceSampleCounter == m_interferenceSamplePeriod)
    {
      m_reportInterferenceTrace (m_cellId, interfCopy);
      m_interferenceSampleCounter = 0;
    }
}

void
LteEnbPhy::ReportRsReceivedPower (const SpectrumValue& power)
{
  // not used by eNB
}



FfMacSchedSapProvider::SchedUlCqiInfoReqParameters
LteEnbPhy::CreatePuschCqiReport (const SpectrumValue& sinr)
{
  NS_LOG_FUNCTION (this << sinr);
  Values::const_iterator it;
  FfMacSchedSapProvider::SchedUlCqiInfoReqParameters ulcqi;
  ulcqi.m_ulCqi.m_type = UlCqi_s::PUSCH;
  int i = 0;
  for (it = sinr.ConstValuesBegin (); it != sinr.ConstValuesEnd (); it++)
    {
      double sinrdb = 10 * std::log10 ((*it));
//       NS_LOG_DEBUG ("ULCQI RB " << i << " value " << sinrdb);
      // convert from double to fixed point notation Sxxxxxxxxxxx.xxx
      int16_t sinrFp = LteFfConverter::double2fpS11dot3 (sinrdb);
      ulcqi.m_ulCqi.m_sinr.push_back (sinrFp);
      i++;
    }
  return (ulcqi);
    
}


void
LteEnbPhy::DoSetBandwidth (uint8_t ulBandwidth, uint8_t dlBandwidth)
{
  NS_LOG_FUNCTION (this << (uint32_t) ulBandwidth << (uint32_t) dlBandwidth);
  m_ulBandwidth = ulBandwidth;
  m_dlBandwidth = dlBandwidth;

  static const int Type0AllocationRbg[4] = {
    10,     // RGB size 1
    26,     // RGB size 2
    63,     // RGB size 3
    110     // RGB size 4
  };  // see table 7.1.6.1-1 of 36.213
  for (int i = 0; i < 4; i++)
    {
      if (dlBandwidth < Type0AllocationRbg[i])
        {
          m_rbgSize = i + 1;
          break;
        }
    }
}

void 
LteEnbPhy::DoSetEarfcn (uint16_t ulEarfcn, uint16_t dlEarfcn)
{
  NS_LOG_FUNCTION (this << ulEarfcn << dlEarfcn);
  m_ulEarfcn = ulEarfcn;
  m_dlEarfcn = dlEarfcn;
}


void 
LteEnbPhy::DoAddUe (uint16_t rnti)
{
  NS_LOG_FUNCTION (this << rnti);
 
  bool success = AddUePhy (rnti);
  NS_ASSERT_MSG (success, "AddUePhy() failed");
}

void 
LteEnbPhy::DoRemoveUe (uint16_t rnti)
{
  NS_LOG_FUNCTION (this << rnti);
 
  bool success = DeleteUePhy (rnti);
  NS_ASSERT_MSG (success, "DeleteUePhy() failed");
}


FfMacSchedSapProvider::SchedUlCqiInfoReqParameters
LteEnbPhy::CreateSrsCqiReport (const SpectrumValue& sinr)
{
  NS_LOG_FUNCTION (this << sinr);
  Values::const_iterator it;
  FfMacSchedSapProvider::SchedUlCqiInfoReqParameters ulcqi;
  ulcqi.m_ulCqi.m_type = UlCqi_s::SRS;
  int i = 0;
  double srsSum = 0.0;
  for (it = sinr.ConstValuesBegin (); it != sinr.ConstValuesEnd (); it++)
  {
    double sinrdb = 10 * log10 ((*it));
    //       NS_LOG_DEBUG ("ULCQI RB " << i << " value " << sinrdb);
    // convert from double to fixed point notation Sxxxxxxxxxxx.xxx
    int16_t sinrFp = LteFfConverter::double2fpS11dot3 (sinrdb);
    srsSum += (*it);
    ulcqi.m_ulCqi.m_sinr.push_back (sinrFp);
    i++;
  }
  // Insert the user generated the srs as a vendor specific parameter
  NS_LOG_DEBUG (this << " ENB RX UL-CQI of " << m_srsUeOffset.at (m_currentSrsOffset));
  VendorSpecificListElement_s vsp;
  vsp.m_type = SRS_CQI_RNTI_VSP;
  vsp.m_length = sizeof(SrsCqiRntiVsp);
  Ptr<SrsCqiRntiVsp> rnti  = Create <SrsCqiRntiVsp> (m_srsUeOffset.at (m_currentSrsOffset));
  vsp.m_value = rnti;
  ulcqi.m_vendorSpecificList.push_back (vsp);
  // call SRS tracing method
  CreateSrsReport (m_srsUeOffset.at (m_currentSrsOffset),
                   (i > 0) ? (srsSum / i) : DBL_MAX);
  return (ulcqi);
  
}


void
LteEnbPhy::CreateSrsReport(uint16_t rnti, double srs)
{
  NS_LOG_FUNCTION (this << rnti << srs);
  std::map <uint16_t,uint16_t>::iterator it = m_srsSampleCounterMap.find (rnti);
  if (it==m_srsSampleCounterMap.end ())
    {
      // create new entry
      m_srsSampleCounterMap.insert (std::pair <uint16_t,uint16_t> (rnti, 0));
      it = m_srsSampleCounterMap.find (rnti);
    }
  (*it).second++;
  if ((*it).second == m_srsSamplePeriod)
    {
      m_reportUeSinr (m_cellId, rnti, srs);
      (*it).second = 0;
    }
}

void
LteEnbPhy::DoSetTransmissionMode (uint16_t  rnti, uint8_t txMode)
{
  NS_LOG_FUNCTION (this << rnti << (uint16_t)txMode);
  // UL supports only SISO MODE
}

void
LteEnbPhy::QueueUlDci (UlDciLteControlMessage m)
{
  NS_LOG_FUNCTION (this);
  m_ulDciQueue.at (UL_PUSCH_TTIS_DELAY - 1).push_back (m);
}

std::list<UlDciLteControlMessage>
LteEnbPhy::DequeueUlDci (void)
{
  NS_LOG_FUNCTION (this);
  if (m_ulDciQueue.at (0).size ()>0)
    {
      std::list<UlDciLteControlMessage> ret = m_ulDciQueue.at (0);
      m_ulDciQueue.erase (m_ulDciQueue.begin ());
      std::list<UlDciLteControlMessage> l;
      m_ulDciQueue.push_back (l);
      return (ret);
    }
  else
    {
      m_ulDciQueue.erase (m_ulDciQueue.begin ());
      std::list<UlDciLteControlMessage> l;
      m_ulDciQueue.push_back (l);
      std::list<UlDciLteControlMessage> emptylist;
      return (emptylist);
    }
}

void
LteEnbPhy::DoSetSrsConfigurationIndex (uint16_t  rnti, uint16_t srcCi)
{
  NS_LOG_FUNCTION (this);
  uint16_t p = GetSrsPeriodicity (srcCi);
  if (p!=m_srsPeriodicity)
    {
      // resize the array of offset -> re-initialize variables
      m_srsUeOffset.clear ();
      m_srsUeOffset.resize (p, 0);
      m_srsPeriodicity = p;
      // inhibit SRS until RRC Connection Reconfiguration propagates
      // to UEs, otherwise we might be wrong in determining the UE who
      // actually sent the SRS (if the UE was using a stale SRS config)
      // if we use a static SRS configuration index, we can have a 0ms guard time
      m_srsStartTime = Simulator::Now () + MilliSeconds (m_macChTtiDelay) + MilliSeconds (0);
    }

  NS_LOG_DEBUG (this << " ENB SRS P " << m_srsPeriodicity << " RNTI " << rnti << " offset " << GetSrsSubframeOffset (srcCi) << " CI " << srcCi);
  std::map <uint16_t,uint16_t>::iterator it = m_srsCounter.find (rnti);
  if (it != m_srsCounter.end ())
    {
      (*it).second = GetSrsSubframeOffset (srcCi) + 1;
    }
  else
    {
      m_srsCounter.insert (std::pair<uint16_t, uint16_t> (rnti, GetSrsSubframeOffset (srcCi) + 1));
    }
  m_srsUeOffset.at (GetSrsSubframeOffset (srcCi)) = rnti;
    
}


void 
LteEnbPhy::DoSetMasterInformationBlock (LteRrcSap::MasterInformationBlock mib)
{
  NS_LOG_FUNCTION (this);
  m_mib = mib;
}


void
LteEnbPhy::DoSetSystemInformationBlockType1 (LteRrcSap::SystemInformationBlockType1 sib1)
{
  NS_LOG_FUNCTION (this);
  m_sib1 = sib1;
}


void
LteEnbPhy::SetHarqPhyModule (Ptr<LteHarqPhy> harq)
{
  m_harqPhyModule = harq;
}


void
LteEnbPhy::ReceiveLteUlHarqFeedback (UlInfoListElement_s mes)
{
  NS_LOG_FUNCTION (this);
  // forward to scheduler
  m_enbPhySapUser->UlInfoListElementHarqFeeback (mes);
}

};