buildings-channel-condition-model.cc

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/*
 * Copyright (c) 2015, NYU WIRELESS, Tandon School of Engineering, New York
 * University
 * Copyright (c) 2019 SIGNET Lab, Department of Information Engineering,
 * University of Padova
 *
 * 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
 */
 
#include "ns3/buildings-channel-condition-model.h"
 
#include "ns3/building-list.h"
#include "ns3/log.h"
#include "ns3/mobility-building-info.h"
#include "ns3/mobility-model.h"
 
namespace ns3
{
 
NS_LOG_COMPONENT_DEFINE("BuildingsChannelConditionModel");
 
NS_OBJECT_ENSURE_REGISTERED(BuildingsChannelConditionModel);
 
TypeId
BuildingsChannelConditionModel::GetTypeId()
{
    static TypeId tid = TypeId("ns3::BuildingsChannelConditionModel")
                            .SetParent<ChannelConditionModel>()
                            .SetGroupName("Buildings")
                            .AddConstructor<BuildingsChannelConditionModel>();
    return tid;
}
 
BuildingsChannelConditionModel::BuildingsChannelConditionModel()
    : ChannelConditionModel()
{
}
 
BuildingsChannelConditionModel::~BuildingsChannelConditionModel()
{
}
 
Ptr<ChannelCondition>
BuildingsChannelConditionModel::GetChannelCondition(Ptr<const MobilityModel> a,
                                                    Ptr<const MobilityModel> b) const
{
    NS_LOG_FUNCTION(this);
    Ptr<MobilityBuildingInfo> a1 = a->GetObject<MobilityBuildingInfo>();
    Ptr<MobilityBuildingInfo> b1 = b->GetObject<MobilityBuildingInfo>();
    NS_ASSERT_MSG(a1 && b1, "BuildingsChannelConditionModel only works with MobilityBuildingInfo");
 
    Ptr<ChannelCondition> cond = CreateObject<ChannelCondition>();
 
    bool isAIndoor = a1->IsIndoor();
    bool isBIndoor = b1->IsIndoor();
 
    if (!isAIndoor && !isBIndoor) // a and b are outdoor
    {
        cond->SetO2iCondition(ChannelCondition::O2iConditionValue::O2O);
 
        // The outdoor case, determine LOS/NLOS
        // The channel condition should be LOS if the line of sight is not blocked,
        // otherwise NLOS
        bool blocked = IsLineOfSightBlocked(a->GetPosition(), b->GetPosition());
        NS_LOG_DEBUG("a and b are outdoor, blocked " << blocked);
        if (!blocked)
        {
            NS_LOG_DEBUG("Set LOS");
            cond->SetLosCondition(ChannelCondition::LosConditionValue::LOS);
        }
        else
        {
            cond->SetLosCondition(ChannelCondition::LosConditionValue::NLOS);
        }
    }
    else if (isAIndoor && isBIndoor) // a and b are indoor
    {
        cond->SetO2iCondition(ChannelCondition::O2iConditionValue::I2I);
 
        // Indoor case, determine is the two nodes are inside the same building
        // or not
        if (a1->GetBuilding() == b1->GetBuilding())
        {
            NS_LOG_DEBUG("a and b are indoor in the same building");
            cond->SetLosCondition(ChannelCondition::LosConditionValue::LOS);
        }
        else
        {
            NS_LOG_DEBUG("a and b are indoor in different buildings");
            cond->SetLosCondition(ChannelCondition::LosConditionValue::NLOS);
        }
    }
    else // outdoor to indoor case
    {
        cond->SetO2iCondition(ChannelCondition::O2iConditionValue::O2I);
 
        NS_LOG_DEBUG("a is indoor and b outdoor or viceversa");
        cond->SetLosCondition(ChannelCondition::LosConditionValue::NLOS);
    }
 
    return cond;
}
 
bool
BuildingsChannelConditionModel::IsLineOfSightBlocked(const ns3::Vector& l1,
                                                     const ns3::Vector& l2) const
{
    for (BuildingList::Iterator bit = BuildingList::Begin(); bit != BuildingList::End(); ++bit)
    {
        if ((*bit)->IsIntersect(l1, l2))
        {
            // The line of sight should be blocked if the line-segment between
            // l1 and l2 intersects one of the buildings.
            return true;
        }
    }
 
    // The line of sight should not be blocked if the line-segment between
    // l1 and l2 did not intersect any building.
    return false;
}
 
int64_t
BuildingsChannelConditionModel::AssignStreams(int64_t /* stream */)
{
    return 0;
}
 
} // end namespace ns3