satellite-per-fragment-interference.cc

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2018 CNES
 *
 * 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: Mathias Ettinger <mettinger@toulouse.viveris.com>
 */
 
#include "satellite-per-fragment-interference.h"
 
#include "ns3/log.h"
#include "ns3/simulator.h"
 
#include <cstddef>
#include <stdint.h>
#include <utility>
#include <vector>
 
NS_LOG_COMPONENT_DEFINE("SatPerFragmentInterference");
 
namespace ns3
{
 
NS_OBJECT_ENSURE_REGISTERED(SatPerFragmentInterference);
 
TypeId
SatPerFragmentInterference::GetTypeId(void)
{
    static TypeId tid = TypeId("ns3::SatPerFragmentInterference")
                            .SetParent<SatPerPacketInterference>()
                            .AddConstructor<SatPerFragmentInterference>();
 
    return tid;
}
 
SatPerFragmentInterference::SatPerFragmentInterference()
    : SatPerPacketInterference(),
      m_ifPowerAtEventChangeW(),
      m_maxFragmentsCount(1)
{
    NS_LOG_FUNCTION(this);
}
 
SatPerFragmentInterference::SatPerFragmentInterference(SatEnums::ChannelType_t channelType,
                                                       double rxBandwidthHz)
    : SatPerPacketInterference(channelType, rxBandwidthHz),
      m_ifPowerAtEventChangeW(),
      m_maxFragmentsCount(1)
{
    NS_LOG_FUNCTION(this);
}
 
SatPerFragmentInterference::~SatPerFragmentInterference()
{
    NS_LOG_FUNCTION(this);
}
 
std::vector<std::pair<double, double>>
SatPerFragmentInterference::DoCalculate(Ptr<SatInterference::InterferenceChangeEvent> event)
{
    NS_LOG_FUNCTION(this);
 
    m_ifPowerAtEventChangeW.clear();
    m_ifPowerAtEventChangeW.reserve(m_maxFragmentsCount);
 
    // Use the per packet interference computation hooks to store
    // interferences at each event associated to the current packet
    SatPerPacketInterference::DoCalculate(event);
 
    std::size_t fragmentsCount = m_ifPowerAtEventChangeW.size();
    if (!fragmentsCount)
    {
        NS_FATAL_ERROR("Interference computation did not find a single fragment");
    }
 
    if (fragmentsCount > m_maxFragmentsCount)
    {
        m_maxFragmentsCount = fragmentsCount;
    }
 
    // Convert time ratio into durations
    std::vector<std::pair<double, double>> ifPowerPerFragment;
    ifPowerPerFragment.reserve(fragmentsCount);
 
    std::vector<std::pair<double, double>>::const_iterator iter = m_ifPowerAtEventChangeW.begin();
    std::pair<double, double> eventChangeInPower = *iter;
    for (++iter; iter != m_ifPowerAtEventChangeW.end(); ++iter)
    {
        ifPowerPerFragment.emplace_back(iter->first - eventChangeInPower.first,
                                        eventChangeInPower.second);
        eventChangeInPower = *iter;
    }
 
    // Account for the last fragment duration
    if (eventChangeInPower.first != 1.0)
    {
        ifPowerPerFragment.emplace_back(1.0 - eventChangeInPower.first, eventChangeInPower.second);
    }
 
    return ifPowerPerFragment;
}
 
void
SatPerFragmentInterference::onOwnStartReached(double ifPowerW)
{
    // Hook into per packet interference computation to store
    // interference level at the beginning of the packet
    m_ifPowerAtEventChangeW.emplace_back(0.0, ifPowerW);
}
 
void
SatPerFragmentInterference::onInterferentEvent(long double timeRatio,
                                               double interferenceValue,
                                               double& ifPowerW)
{
    // Hook into per packet interference computation to store
    // interference level at each event change
    ifPowerW += interferenceValue;
    m_ifPowerAtEventChangeW.emplace_back(1.0 - timeRatio, ifPowerW);
}
 
} // namespace ns3