/*
 * Copyright (c) 2011 Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 * Author:  Biljana Bojovic<bbojovic@cttc.es>
 *          Dizhi Zhou <dizhi.zhou@gmail.com>
 *          Marco Miozzo <marco.miozzo@cttc.es>,
 *          Nicola Baldo <nbaldo@cttc.es>
 *
 */

#include "lte-test-cqa-ff-mac-scheduler.h"

#include "ns3/boolean.h"
#include "ns3/constant-position-mobility-model.h"
#include "ns3/double.h"
#include "ns3/enum.h"
#include "ns3/eps-bearer.h"
#include "ns3/ff-mac-scheduler.h"
#include "ns3/internet-module.h"
#include "ns3/ipv4-global-routing-helper.h"
#include "ns3/log.h"
#include "ns3/lte-enb-net-device.h"
#include "ns3/lte-enb-phy.h"
#include "ns3/lte-helper.h"
#include "ns3/lte-ue-net-device.h"
#include "ns3/lte-ue-phy.h"
#include "ns3/lte-ue-rrc.h"
#include "ns3/mobility-helper.h"
#include "ns3/net-device-container.h"
#include "ns3/network-module.h"
#include "ns3/node-container.h"
#include "ns3/object.h"
#include "ns3/packet-sink-helper.h"
#include "ns3/packet.h"
#include "ns3/point-to-point-epc-helper.h"
#include "ns3/point-to-point-helper.h"
#include "ns3/ptr.h"
#include "ns3/radio-bearer-stats-calculator.h"
#include "ns3/simulator.h"
#include "ns3/spectrum-error-model.h"
#include "ns3/spectrum-interference.h"
#include "ns3/string.h"
#include "ns3/test.h"
#include "ns3/udp-client-server-helper.h"

#include <iostream>
#include <sstream>
#include <string>

using namespace ns3;

NS_LOG_COMPONENT_DEFINE("LenaTestCqaFfMacScheduler");

LenaTestCqaFfMacSchedulerSuite::LenaTestCqaFfMacSchedulerSuite()
    : TestSuite("lte-cqa-ff-mac-scheduler", Type::SYSTEM)
{
    NS_LOG_INFO("creating LenaTestCqaFfMacSchedulerSuite");

    bool errorModel = false;

    // General config
    // Traffic: UDP traffic with fixed rate
    // Token generation rate = traffic rate
    // RLC header length = 2 bytes, PDCP header = 2 bytes
    // Simulation time = 1.0 sec
    // Throughput in this file is calculated in RLC layer

    // Test Case 1: homogeneous flow test in CQA (same distance)
    //  DOWNLINK -> DISTANCE 0 -> MCS 28 -> Itbs 26 (from table 7.1.7.2.1-1 of 36.2    13)
    //  Traffic info
    //    UDP traffic: payload size = 200 bytes, interval = 1 ms
    //    UDP rate in scheduler: (payload + RLC header + PDCP header + IP header + UDP header) *
    //    1000 byte/sec -> 232000 byte/rate
    //  Total bandwidth: 24 PRB at Itbs 26 -> 2196 -> 2196000 byte/sec
    //  1 user -> 232000 * 1 = 232000 < 2196000 -> throughput = 232000 byte/sec
    //  3 user -> 232000 * 3 = 696000 < 2196000 -> througphut = 232000 byte/sec
    //  6 user -> 232000 * 6 = 139200 < 2196000 -> throughput = 232000 byte/sec
    //  12 user -> 232000 * 12 = 2784000 > 2196000 -> throughput = 2196000 / 12 = 183000 byte/sec
    //  UPLINK -> DISTANCE 0 -> MCS 28 -> Itbs 26 (from table 7.1.7.2.1-1 of 36.2    13)
    //  1 user -> 25 PRB at Itbs 26 -> 2292 -> 2292000 > 232000 -> throughput = 232000 bytes/sec
    //  3 users -> 8 PRB at Itbs 26 -> 749 -> 749000 > 232000 -> throughput = 232000 bytes/sec
    //  6 users -> 4 PRB at Itbs 26 -> 373 -> 373000 > 232000 -> throughput = 232000 bytes/sec
    //  12 users -> 2 PRB at Itbs 26 -> 185 -> 185000 < 232000 -> throughput = 185000 bytes/sec
    AddTestCase(new LenaCqaFfMacSchedulerTestCase1(1, 0, 232000, 232000, 200, 1, errorModel),
                TestCase::Duration::EXTENSIVE);
    AddTestCase(new LenaCqaFfMacSchedulerTestCase1(3, 0, 232000, 232000, 200, 1, errorModel),
                TestCase::Duration::EXTENSIVE);
    AddTestCase(new LenaCqaFfMacSchedulerTestCase1(6, 0, 232000, 232000, 200, 1, errorModel),
                TestCase::Duration::EXTENSIVE);

    // AddTestCase (new LenaCqaFfMacSchedulerTestCase1 (12,0,183000,185000,200,1,errorModel));//
    // simulation time = 1.5, otherwise, ul test will fail

    // DOWNLINK - DISTANCE 4800 -> MCS 22 -> Itbs 20 (from table 7.1.7.2.1-1 of 36.213)
    // Traffic info
    //   UDP traffic: payload size = 200 bytes, interval = 1 ms
    //   UDP rate in scheduler: (payload + RLC header + PDCP header + IP header + UDP header) * 1000
    //   byte/sec -> 232000 byte/rate
    // Total bandwidth: 24 PRB at Itbs 20 -> 1383 -> 1383000 byte/sec
    // 1 user -> 903000 * 1 = 232000 < 1383000 -> throughput = 232000 byte/sec
    // 3 user -> 232000 * 3 = 696000 < 1383000 -> througphut = 232000 byte/sec
    // 6 user -> 232000 * 6 = 139200 > 1383000 -> throughput = 1383000 / 6 = 230500 byte/sec
    // 12 user -> 232000 * 12 = 2784000 > 1383000 -> throughput =  1383000 / 12 = 115250 byte/sec
    // UPLINK - DISTANCE 4800 -> MCS 14 -> Itbs 13 (from table 7.1.7.2.1-1 of 36.213)
    // 1 user -> 25 PRB at Itbs 13 -> 807 -> 807000 > 232000 -> throughput = 232000 bytes/sec
    // 3 users -> 8 PRB at Itbs 13 -> 253 -> 253000 > 232000 -> throughput = 232000 bytes/sec
    // 6 users -> 4 PRB at Itbs 13 -> 125 -> 125000 < 232000 -> throughput = 125000 bytes/sec
    // after the patch enforcing min 3 PRBs per UE:
    // 12 users -> 3 PRB at Itbs 13 -> 93  bytes * 8/12 UE/TTI  -> 62000 < 232000 -> throughput =
    // 62000  bytes/sec
    AddTestCase(new LenaCqaFfMacSchedulerTestCase1(1, 4800, 232000, 232000, 200, 1, errorModel),
                TestCase::Duration::EXTENSIVE);
    AddTestCase(new LenaCqaFfMacSchedulerTestCase1(3, 4800, 232000, 232000, 200, 1, errorModel),
                TestCase::Duration::EXTENSIVE);
    AddTestCase(new LenaCqaFfMacSchedulerTestCase1(6, 4800, 230500, 125000, 200, 1, errorModel),
                TestCase::Duration::EXTENSIVE);
    // AddTestCase (new LenaCqaFfMacSchedulerTestCase1 (12,4800,115250,62000,200,1,errorModel)); //
    // simulation time = 1.5, otherwise, ul test will fail

    // DOWNLINK - DISTANCE 6000 -> MCS 20 -> Itbs 18 (from table 7.1.7.2.1-1 of 36.213)
    // Traffic info
    //   UDP traffic: payload size = 200 bytes, interval = 1 ms
    //   UDP rate in scheduler: (payload + RLC header + PDCP header + IP header + UDP header) * 1000
    //   byte/sec -> 232000 byte/rate
    // Total bandwidth: 24 PRB at Itbs 18 -> 1191 -> 1191000 byte/sec
    // 1 user -> 903000 * 1 = 232000 < 1191000 -> throughput = 232000 byte/sec
    // 3 user -> 232000 * 3 = 696000 < 1191000 -> througphut = 232000 byte/sec
    // 6 user -> 232000 * 6 = 1392000 > 1191000 -> throughput = 1191000 / 6 = 198500 byte/sec
    // 12 user -> 232000 * 12 = 2784000 > 1191000 -> throughput =  1191000 / 12 = 99250 byte/sec

    // UPLINK - DISTANCE 6000 -> MCS 12 -> Itbs 11 (from table 7.1.7.2.1-1 of 36.213)
    // 1 user -> 25 PRB at Itbs 11 -> 621 -> 621000 > 232000 -> throughput = 232000 bytes/sec
    // 3 users -> 8 PRB at Itbs 11 -> 201 -> 201000 < 232000 -> throughput = 201000  bytes/sec
    // 6 users -> 4 PRB at Itbs 11 -> 97 -> 97000 < 232000 -> throughput = 97000 bytes/sec
    // after the patch enforcing min 3 PRBs per UE:
    // 12 users -> 3 PRB at Itbs 11 -> 73 bytes * 8/12 UE/TTI -> 48667 < 232000 -> throughput =
    // 48667 bytes/sec
    AddTestCase(new LenaCqaFfMacSchedulerTestCase1(1, 6000, 232000, 232000, 200, 1, errorModel),
                TestCase::Duration::EXTENSIVE);
    AddTestCase(new LenaCqaFfMacSchedulerTestCase1(3, 6000, 232000, 201000, 200, 1, errorModel),
                TestCase::Duration::EXTENSIVE);
    AddTestCase(new LenaCqaFfMacSchedulerTestCase1(6, 6000, 198500, 97000, 200, 1, errorModel),
                TestCase::Duration::EXTENSIVE);
    // AddTestCase (new LenaCqaFfMacSchedulerTestCase1 (12,6000,99250,48667,200,1, errorModel)); //
    // simulation time = 1.5, otherwise, ul test will fail

    // DOWNLINK - DISTANCE 10000 -> MCS 14 -> Itbs 13 (from table 7.1.7.2.1-1 of 36.213)
    // Traffic info
    //   UDP traffic: payload size = 200 bytes, interval = 1 ms
    //   UDP rate in scheduler: (payload + RLC header + PDCP header + IP header + UDP header) * 1000
    //   byte/sec -> 232000 byte/rate
    // Total bandwidth: 24 PRB at Itbs 13 -> 775 -> 775000 byte/sec
    // 1 user -> 903000 * 1 = 232000 < 775000 -> throughput = 232000 byte/sec
    // 3 user -> 232000 * 3 = 696000 > 775000 -> througphut = 232000 byte/sec
    // 6 user -> 232000 * 6 = 139200 > 775000 -> throughput = 775000 / 6 = 129166 byte/sec
    // 12 user -> 232000 * 12 = 2784000 > 775000 -> throughput =  775000 / 12 = 64583 byte/sec
    // UPLINK - DISTANCE 10000 -> MCS 8 -> Itbs 8 (from table 7.1.7.2.1-1 of 36.213)
    // 1 user -> 24 PRB at Itbs 8 -> 437 -> 437000 > 232000 -> throughput = 232000 bytes/sec
    // 3 users -> 8 PRB at Itbs 8 -> 137 -> 137000 < 232000 -> throughput = 137000 bytes/sec
    // 6 users -> 4 PRB at Itbs 8 -> 67 -> 67000 < 232000 -> throughput = 67000 bytes/sec
    // after the patch enforcing min 3 PRBs per UE:
    // 12 users -> 3 PRB at Itbs 8 -> 49 bytes * 8/12 UE/TTI -> 32667 < 232000 -> throughput = 32667
    // bytes/sec
    AddTestCase(new LenaCqaFfMacSchedulerTestCase1(1, 10000, 232000, 232000, 200, 1, errorModel),
                TestCase::Duration::EXTENSIVE);
    AddTestCase(new LenaCqaFfMacSchedulerTestCase1(3, 10000, 232000, 137000, 200, 1, errorModel),
                TestCase::Duration::EXTENSIVE);
    AddTestCase(new LenaCqaFfMacSchedulerTestCase1(6, 10000, 129166, 67000, 200, 1, errorModel),
                TestCase::Duration::EXTENSIVE);
    // AddTestCase (new LenaCqaFfMacSchedulerTestCase1 (12,10000,64583,32667,200,1,errorModel));//
    // simulation time = 1.5, otherwise, ul test will fail

    // DOWNLINK - DISTANCE 100000 -> CQI == 0 -> out of range -> 0 bytes/sec
    // UPLINK - DISTANCE 100000 -> CQI == 0 -> out of range -> 0 bytes/sec
    AddTestCase(new LenaCqaFfMacSchedulerTestCase1(1, 100000, 0, 0, 200, 1, errorModel),
                TestCase::Duration::QUICK);

    // Test Case 2: homogeneous flow test in CQA (different distance)
    // Traffic1 info
    //   UDP traffic: payload size = 100 bytes, interval = 1 ms
    //   UDP rate in scheduler: (payload + RLC header + PDCP header + IP header + UDP header) * 1000
    //   byte/sec -> 132000 byte/rate
    // Maximum throughput = 4 / ( 1/2196000 + 1/1191000 + 1/1383000 + 1/775000 ) = 1209046 byte/s
    // 132000 * 4 = 528000 < 1209046 -> estimated throughput in downlink = 132000 byte/sec
    std::vector<double> dist1;
    dist1.push_back(0);     // User 0 distance --> MCS 28
    dist1.push_back(4800);  // User 1 distance --> MCS 22
    dist1.push_back(6000);  // User 2 distance --> MCS 20
    dist1.push_back(10000); // User 3 distance --> MCS 14
    std::vector<uint16_t> packetSize1;
    packetSize1.push_back(100);
    packetSize1.push_back(100);
    packetSize1.push_back(100);
    packetSize1.push_back(100);
    std::vector<uint32_t> estThrCqaDl1;
    estThrCqaDl1.push_back(132000); // User 0 estimated TTI throughput from CQA
    estThrCqaDl1.push_back(132000); // User 1 estimated TTI throughput from CQA
    estThrCqaDl1.push_back(132000); // User 2 estimated TTI throughput from CQA
    estThrCqaDl1.push_back(132000); // User 3 estimated TTI throughput from CQA
    AddTestCase(new LenaCqaFfMacSchedulerTestCase2(dist1, estThrCqaDl1, packetSize1, 1, errorModel),
                TestCase::Duration::QUICK);

    // Traffic2 info
    //   UDP traffic: payload size = 200 bytes, interval = 1 ms
    //   UDP rate in scheduler: (payload + RLC header + PDCP header + IP header + UDP header) * 1000
    //   byte/sec -> 232000 byte/rate
    // Maximum throughput = 4 / ( 1/2196000 + 1/1191000 + 1/1383000 + 1/775000 ) = 1209046 byte/s
    // 232000 * 4 = 928000 < 1209046 -> estimated throughput in downlink = 928000 / 4 = 230000
    // byte/sec
    std::vector<double> dist2;
    dist2.push_back(0);     // User 0 distance --> MCS 28
    dist2.push_back(4800);  // User 1 distance --> MCS 22
    dist2.push_back(6000);  // User 2 distance --> MCS 20
    dist2.push_back(10000); // User 3 distance --> MCS 14
    std::vector<uint16_t> packetSize2;
    packetSize2.push_back(200);
    packetSize2.push_back(200);
    packetSize2.push_back(200);
    packetSize2.push_back(200);
    std::vector<uint32_t> estThrCqaDl2;
    estThrCqaDl2.push_back(230000); // User 0 estimated TTI throughput from CQA
    estThrCqaDl2.push_back(230000); // User 1 estimated TTI throughput from CQA
    estThrCqaDl2.push_back(230000); // User 2 estimated TTI throughput from CQA
    estThrCqaDl2.push_back(230000); // User 3 estimated TTI throughput from CQA
    AddTestCase(new LenaCqaFfMacSchedulerTestCase2(dist2, estThrCqaDl2, packetSize2, 1, errorModel),
                TestCase::Duration::QUICK);

    // Test Case 3: heterogeneous flow test in CQA
    //   UDP traffic: payload size = [100,200,300] bytes, interval = 1 ms
    //   UDP rate in scheduler: (payload + RLC header + PDCP header + IP header + UDP header) * 1000
    //   byte/sec -> [132000, 232000, 332000] byte/rate
    // Maximum throughput = 3 / ( 1/2196000 + 1/1191000 + 1/1383000) = 1486569 byte/s
    // 132000 + 232000 + 332000 = 696000 < 1486569 -> estimated throughput in downlink = [132000,
    // 232000, 332000] byte/sec
    std::vector<double> dist3;
    dist3.push_back(0);    // User 0 distance --> MCS 28
    dist3.push_back(4800); // User 1 distance --> MCS 22
    dist3.push_back(6000); // User 2 distance --> MCS 20
    std::vector<uint16_t> packetSize3;
    packetSize3.push_back(100);
    packetSize3.push_back(200);
    packetSize3.push_back(300);
    std::vector<uint32_t> estThrCqaDl3;
    estThrCqaDl3.push_back(132000); // User 0 estimated TTI throughput from CQA
    estThrCqaDl3.push_back(232000); // User 1 estimated TTI throughput from CQA
    estThrCqaDl3.push_back(332000); // User 2 estimated TTI throughput from CQA
    AddTestCase(new LenaCqaFfMacSchedulerTestCase2(dist3, estThrCqaDl3, packetSize3, 1, errorModel),
                TestCase::Duration::QUICK);
}

/**
 * @ingroup lte-test
 * Static variable for test initialization
 */
static LenaTestCqaFfMacSchedulerSuite lenaTestCqaFfMacSchedulerSuite;

// --------------- T E S T - C A S E   # 1 ------------------------------

std::string
LenaCqaFfMacSchedulerTestCase1::BuildNameString(uint16_t nUser, double dist)
{
    std::ostringstream oss;
    oss << nUser << " UEs, distance " << dist << " m";
    return oss.str();
}

LenaCqaFfMacSchedulerTestCase1::LenaCqaFfMacSchedulerTestCase1(uint16_t nUser,
                                                               double dist,
                                                               double thrRefDl,
                                                               double thrRefUl,
                                                               uint16_t packetSize,
                                                               uint16_t interval,
                                                               bool errorModelEnabled)
    : TestCase(BuildNameString(nUser, dist)),
      m_nUser(nUser),
      m_dist(dist),
      m_packetSize(packetSize),
      m_interval(interval),
      m_thrRefDl(thrRefDl),
      m_thrRefUl(thrRefUl),
      m_errorModelEnabled(errorModelEnabled)
{
}

LenaCqaFfMacSchedulerTestCase1::~LenaCqaFfMacSchedulerTestCase1()
{
}

void
LenaCqaFfMacSchedulerTestCase1::DoRun()
{
    NS_LOG_FUNCTION(this << GetName());
    SetDataDir(NS_TEST_SOURCEDIR);

    if (!m_errorModelEnabled)
    {
        Config::SetDefault("ns3::LteSpectrumPhy::CtrlErrorModelEnabled", BooleanValue(false));
        Config::SetDefault("ns3::LteSpectrumPhy::DataErrorModelEnabled", BooleanValue(false));
    }

    Config::SetDefault("ns3::LteHelper::UseIdealRrc", BooleanValue(true));
    Config::SetDefault("ns3::MacStatsCalculator::DlOutputFilename",
                       StringValue(CreateTempDirFilename("DlMacStats.txt")));
    Config::SetDefault("ns3::MacStatsCalculator::UlOutputFilename",
                       StringValue(CreateTempDirFilename("UlMacStats.txt")));
    Config::SetDefault("ns3::RadioBearerStatsCalculator::DlRlcOutputFilename",
                       StringValue(CreateTempDirFilename("DlRlcStats.txt")));
    Config::SetDefault("ns3::RadioBearerStatsCalculator::UlRlcOutputFilename",
                       StringValue(CreateTempDirFilename("UlRlcStats.txt")));

    Ptr<LteHelper> lteHelper = CreateObject<LteHelper>();
    Ptr<PointToPointEpcHelper> epcHelper = CreateObject<PointToPointEpcHelper>();
    lteHelper->SetEpcHelper(epcHelper);

    // LogComponentEnable ("CqaFfMacScheduler", LOG_DEBUG);

    Ptr<Node> pgw = epcHelper->GetPgwNode();

    // Create a single RemoteHost
    NodeContainer remoteHostContainer;
    remoteHostContainer.Create(1);
    Ptr<Node> remoteHost = remoteHostContainer.Get(0);
    InternetStackHelper internet;
    internet.Install(remoteHostContainer);

    // Create the Internet
    PointToPointHelper p2ph;
    p2ph.SetDeviceAttribute("DataRate", DataRateValue(DataRate("100Gb/s")));
    p2ph.SetDeviceAttribute("Mtu", UintegerValue(1500));
    p2ph.SetChannelAttribute("Delay", TimeValue(Seconds(0.001)));
    NetDeviceContainer internetDevices = p2ph.Install(pgw, remoteHost);
    Ipv4AddressHelper ipv4h;
    ipv4h.SetBase("1.0.0.0", "255.0.0.0");
    Ipv4InterfaceContainer internetIpIfaces = ipv4h.Assign(internetDevices);
    // interface 0 is localhost, 1 is the p2p device
    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);

    // Config::SetDefault ("ns3::LteAmc::AmcModel", EnumValue (LteAmc::PiroEW2010));
    // Config::SetDefault ("ns3::LteAmc::Ber", DoubleValue (0.00005));
    // Config::SetDefault ("ns3::LteSpectrumPhy::CtrlErrorModelEnabled", BooleanValue (false));
    // Config::SetDefault ("ns3::LteSpectrumPhy::DataErrorModelEnabled", BooleanValue (false));

    // Config::SetDefault ("ns3::LteEnbRrc::EpsBearerToRlcMapping", EnumValue
    // (LteHelper::RLC_UM_ALWAYS));

    //   LogComponentDisableAll (LOG_LEVEL_ALL);
    // LogComponentEnable ("LenaTestCqaFfMacScheduler", LOG_LEVEL_ALL);

    lteHelper->SetAttribute("PathlossModel", StringValue("ns3::FriisSpectrumPropagationLossModel"));

    // Create Nodes: eNodeB and UE
    NodeContainer enbNodes;
    NodeContainer ueNodes;
    enbNodes.Create(1);
    ueNodes.Create(m_nUser);

    // Install Mobility Model
    MobilityHelper mobility;
    mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
    mobility.Install(enbNodes);
    mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
    mobility.Install(ueNodes);

    // Create Devices and install them in the Nodes (eNB and UE)
    NetDeviceContainer enbDevs;
    NetDeviceContainer ueDevs;
    lteHelper->SetSchedulerType("ns3::CqaFfMacScheduler");
    lteHelper->SetSchedulerAttribute("UlCqiFilter", EnumValue(FfMacScheduler::SRS_UL_CQI));
    enbDevs = lteHelper->InstallEnbDevice(enbNodes);
    ueDevs = lteHelper->InstallUeDevice(ueNodes);

    Ptr<LteEnbNetDevice> lteEnbDev = enbDevs.Get(0)->GetObject<LteEnbNetDevice>();
    Ptr<LteEnbPhy> enbPhy = lteEnbDev->GetPhy();
    enbPhy->SetAttribute("TxPower", DoubleValue(30.0));
    enbPhy->SetAttribute("NoiseFigure", DoubleValue(5.0));

    // Set UEs' position and power
    for (int i = 0; i < m_nUser; i++)
    {
        Ptr<ConstantPositionMobilityModel> mm =
            ueNodes.Get(i)->GetObject<ConstantPositionMobilityModel>();
        mm->SetPosition(Vector(m_dist, 0.0, 0.0));
        Ptr<LteUeNetDevice> lteUeDev = ueDevs.Get(i)->GetObject<LteUeNetDevice>();
        Ptr<LteUePhy> uePhy = lteUeDev->GetPhy();
        uePhy->SetAttribute("TxPower", DoubleValue(23.0));
        uePhy->SetAttribute("NoiseFigure", DoubleValue(9.0));
    }

    // Install the IP stack on the UEs
    internet.Install(ueNodes);
    Ipv4InterfaceContainer ueIpIface;
    ueIpIface = epcHelper->AssignUeIpv4Address(NetDeviceContainer(ueDevs));

    // Assign IP address to UEs
    for (uint32_t u = 0; u < ueNodes.GetN(); ++u)
    {
        Ptr<Node> ueNode = ueNodes.Get(u);
        // Set the default gateway for the UE
        Ptr<Ipv4StaticRouting> ueStaticRouting =
            ipv4RoutingHelper.GetStaticRouting(ueNode->GetObject<Ipv4>());
        ueStaticRouting->SetDefaultRoute(epcHelper->GetUeDefaultGatewayAddress(), 1);
    }

    // Attach a UE to a eNB
    lteHelper->Attach(ueDevs, enbDevs.Get(0));

    // Activate an EPS bearer on all UEs
    for (uint32_t u = 0; u < ueNodes.GetN(); ++u)
    {
        Ptr<NetDevice> ueDevice = ueDevs.Get(u);
        GbrQosInformation qos;
        qos.gbrDl = (m_packetSize + 32) * (1000 / m_interval) *
                    8; // bit/s, considering IP, UDP, RLC, PDCP header size
        qos.gbrUl = (m_packetSize + 32) * (1000 / m_interval) * 8;
        qos.mbrDl = 0;
        qos.mbrUl = 0;

        EpsBearer::Qci q = EpsBearer::GBR_CONV_VOICE;
        EpsBearer bearer(q, qos);
        lteHelper->ActivateDedicatedEpsBearer(ueDevice, bearer, EpcTft::Default());
    }

    // Install downlink and uplink applications
    uint16_t dlPort = 1234;
    uint16_t ulPort = 2000;
    ApplicationContainer clientApps;
    ApplicationContainer serverApps;
    PacketSinkHelper dlPacketSinkHelper("ns3::UdpSocketFactory",
                                        InetSocketAddress(Ipv4Address::GetAny(), dlPort));

    for (uint32_t u = 0; u < ueNodes.GetN(); ++u)
    {
        ++ulPort;
        PacketSinkHelper ulPacketSinkHelper("ns3::UdpSocketFactory",
                                            InetSocketAddress(Ipv4Address::GetAny(), ulPort));
        serverApps.Add(ulPacketSinkHelper.Install(remoteHost)); // receive packets from UEs
        serverApps.Add(
            dlPacketSinkHelper.Install(ueNodes.Get(u))); // receive packets from remotehost

        UdpClientHelper dlClient(ueIpIface.GetAddress(u), dlPort); // downlink packets generator
        dlClient.SetAttribute("Interval", TimeValue(MilliSeconds(m_interval)));
        dlClient.SetAttribute("MaxPackets", UintegerValue(1000000));
        dlClient.SetAttribute("PacketSize", UintegerValue(m_packetSize));

        UdpClientHelper ulClient(remoteHostAddr, ulPort); // uplink packets generator
        ulClient.SetAttribute("Interval", TimeValue(MilliSeconds(m_interval)));
        ulClient.SetAttribute("MaxPackets", UintegerValue(1000000));
        ulClient.SetAttribute("PacketSize", UintegerValue(m_packetSize));

        clientApps.Add(dlClient.Install(remoteHost));
        clientApps.Add(ulClient.Install(ueNodes.Get(u)));
    }

    serverApps.Start(Seconds(0.030));
    clientApps.Start(Seconds(0.030));

    double statsStartTime = 0.300; // need to allow for RRC connection establishment + SRS
    double statsDuration = 0.6;
    double tolerance = 0.1;
    Simulator::Stop(Seconds(statsStartTime + statsDuration - 0.0001));

    lteHelper->EnableRlcTraces();
    lteHelper->EnableMacTraces();
    Ptr<RadioBearerStatsCalculator> rlcStats = lteHelper->GetRlcStats();
    rlcStats->SetAttribute("StartTime", TimeValue(Seconds(statsStartTime)));
    rlcStats->SetAttribute("EpochDuration", TimeValue(Seconds(statsDuration)));

    Simulator::Run();

    NS_LOG_INFO("DL - Test with " << m_nUser << " user(s) at distance " << m_dist);
    std::vector<uint64_t> dlDataRxed;
    for (int i = 0; i < m_nUser; i++)
    {
        // get the imsi
        uint64_t imsi = ueDevs.Get(i)->GetObject<LteUeNetDevice>()->GetImsi();
        // get the lcId
        uint8_t lcId = 4;
        uint64_t data = rlcStats->GetDlRxData(imsi, lcId);
        dlDataRxed.push_back(data);
        NS_LOG_INFO("\tUser " << i << " imsi " << imsi << " bytes rxed " << (double)dlDataRxed.at(i)
                              << "  thr " << (double)dlDataRxed.at(i) / statsDuration << " ref "
                              << m_thrRefDl);
    }

    for (int i = 0; i < m_nUser; i++)
    {
        NS_TEST_ASSERT_MSG_EQ_TOL((double)dlDataRxed.at(i) / statsDuration,
                                  m_thrRefDl,
                                  m_thrRefDl * tolerance,
                                  " Unfair Throughput!");
    }

    /**
     * Check that the uplink assignment is done in a "round robin" manner
     */

    NS_LOG_INFO("UL - Test with " << m_nUser << " user(s) at distance " << m_dist);
    std::vector<uint64_t> ulDataRxed;
    for (int i = 0; i < m_nUser; i++)
    {
        // get the imsi
        uint64_t imsi = ueDevs.Get(i)->GetObject<LteUeNetDevice>()->GetImsi();
        // get the lcId
        uint8_t lcId = 4;
        ulDataRxed.push_back(rlcStats->GetUlRxData(imsi, lcId));
        NS_LOG_INFO("\tUser " << i << " imsi " << imsi << " bytes rxed " << (double)ulDataRxed.at(i)
                              << "  thr " << (double)ulDataRxed.at(i) / statsDuration << " ref "
                              << m_thrRefUl);
    }

    for (int i = 0; i < m_nUser; i++)
    {
        NS_TEST_ASSERT_MSG_EQ_TOL((double)ulDataRxed.at(i) / statsDuration,
                                  m_thrRefUl,
                                  m_thrRefUl * tolerance,
                                  " Unfair Throughput!");
    }
    Simulator::Destroy();
}

// --------------- T E S T - C A S E   # 2 ------------------------------

std::string
LenaCqaFfMacSchedulerTestCase2::BuildNameString(uint16_t nUser, std::vector<double> dist)
{
    std::ostringstream oss;
    oss << "distances (m) = [ ";
    for (auto it = dist.begin(); it != dist.end(); ++it)
    {
        oss << *it << " ";
    }
    oss << "]";
    return oss.str();
}

LenaCqaFfMacSchedulerTestCase2::LenaCqaFfMacSchedulerTestCase2(std::vector<double> dist,
                                                               std::vector<uint32_t> estThrCqaDl,
                                                               std::vector<uint16_t> packetSize,
                                                               uint16_t interval,
                                                               bool errorModelEnabled)
    : TestCase(BuildNameString(dist.size(), dist)),
      m_nUser(dist.size()),
      m_dist(dist),
      m_packetSize(packetSize),
      m_interval(interval),
      m_estThrCqaDl(estThrCqaDl),
      m_errorModelEnabled(errorModelEnabled)
{
}

LenaCqaFfMacSchedulerTestCase2::~LenaCqaFfMacSchedulerTestCase2()
{
}

void
LenaCqaFfMacSchedulerTestCase2::DoRun()
{
    SetDataDir(NS_TEST_SOURCEDIR);

    if (!m_errorModelEnabled)
    {
        Config::SetDefault("ns3::LteSpectrumPhy::CtrlErrorModelEnabled", BooleanValue(false));
        Config::SetDefault("ns3::LteSpectrumPhy::DataErrorModelEnabled", BooleanValue(false));
    }

    Config::SetDefault("ns3::LteHelper::UseIdealRrc", BooleanValue(true));
    Config::SetDefault("ns3::MacStatsCalculator::DlOutputFilename",
                       StringValue(CreateTempDirFilename("DlMacStats.txt")));
    Config::SetDefault("ns3::MacStatsCalculator::UlOutputFilename",
                       StringValue(CreateTempDirFilename("UlMacStats.txt")));
    Config::SetDefault("ns3::RadioBearerStatsCalculator::DlRlcOutputFilename",
                       StringValue(CreateTempDirFilename("DlRlcStats.txt")));
    Config::SetDefault("ns3::RadioBearerStatsCalculator::UlRlcOutputFilename",
                       StringValue(CreateTempDirFilename("UlRlcStats.txt")));

    Ptr<LteHelper> lteHelper = CreateObject<LteHelper>();
    Ptr<PointToPointEpcHelper> epcHelper = CreateObject<PointToPointEpcHelper>();
    lteHelper->SetEpcHelper(epcHelper);

    Ptr<Node> pgw = epcHelper->GetPgwNode();

    // Create a single RemoteHost
    NodeContainer remoteHostContainer;
    remoteHostContainer.Create(1);
    Ptr<Node> remoteHost = remoteHostContainer.Get(0);
    InternetStackHelper internet;
    internet.Install(remoteHostContainer);

    // Create the Internet
    PointToPointHelper p2ph;
    p2ph.SetDeviceAttribute("DataRate", DataRateValue(DataRate("100Gb/s")));
    p2ph.SetDeviceAttribute("Mtu", UintegerValue(1500));
    p2ph.SetChannelAttribute("Delay", TimeValue(Seconds(0.001)));
    NetDeviceContainer internetDevices = p2ph.Install(pgw, remoteHost);
    Ipv4AddressHelper ipv4h;
    ipv4h.SetBase("1.0.0.0", "255.0.0.0");
    Ipv4InterfaceContainer internetIpIfaces = ipv4h.Assign(internetDevices);
    // interface 0 is localhost, 1 is the p2p device
    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);

    //   LogComponentDisableAll (LOG_LEVEL_ALL);
    // LogComponentEnable ("LenaTestCqaFfMacScheduler", LOG_LEVEL_ALL);

    lteHelper->SetAttribute("PathlossModel", StringValue("ns3::FriisSpectrumPropagationLossModel"));

    // Create Nodes: eNodeB and UE
    NodeContainer enbNodes;
    NodeContainer ueNodes;
    enbNodes.Create(1);
    ueNodes.Create(m_nUser);

    // Install Mobility Model
    MobilityHelper mobility;
    mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
    mobility.Install(enbNodes);
    mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
    mobility.Install(ueNodes);

    // Create Devices and install them in the Nodes (eNB and UE)
    NetDeviceContainer enbDevs;
    NetDeviceContainer ueDevs;
    lteHelper->SetSchedulerType("ns3::CqaFfMacScheduler");
    lteHelper->SetSchedulerAttribute("UlCqiFilter", EnumValue(FfMacScheduler::SRS_UL_CQI));
    enbDevs = lteHelper->InstallEnbDevice(enbNodes);
    ueDevs = lteHelper->InstallUeDevice(ueNodes);

    Ptr<LteEnbNetDevice> lteEnbDev = enbDevs.Get(0)->GetObject<LteEnbNetDevice>();
    Ptr<LteEnbPhy> enbPhy = lteEnbDev->GetPhy();
    enbPhy->SetAttribute("TxPower", DoubleValue(30.0));
    enbPhy->SetAttribute("NoiseFigure", DoubleValue(5.0));

    // Set UEs' position and power
    for (int i = 0; i < m_nUser; i++)
    {
        Ptr<ConstantPositionMobilityModel> mm =
            ueNodes.Get(i)->GetObject<ConstantPositionMobilityModel>();
        mm->SetPosition(Vector(m_dist.at(i), 0.0, 0.0));
        Ptr<LteUeNetDevice> lteUeDev = ueDevs.Get(i)->GetObject<LteUeNetDevice>();
        Ptr<LteUePhy> uePhy = lteUeDev->GetPhy();
        uePhy->SetAttribute("TxPower", DoubleValue(23.0));
        uePhy->SetAttribute("NoiseFigure", DoubleValue(9.0));
    }

    // Install the IP stack on the UEs
    internet.Install(ueNodes);
    Ipv4InterfaceContainer ueIpIface;
    ueIpIface = epcHelper->AssignUeIpv4Address(NetDeviceContainer(ueDevs));

    // Assign IP address to UEs
    for (uint32_t u = 0; u < ueNodes.GetN(); ++u)
    {
        Ptr<Node> ueNode = ueNodes.Get(u);
        // Set the default gateway for the UE
        Ptr<Ipv4StaticRouting> ueStaticRouting =
            ipv4RoutingHelper.GetStaticRouting(ueNode->GetObject<Ipv4>());
        ueStaticRouting->SetDefaultRoute(epcHelper->GetUeDefaultGatewayAddress(), 1);
    }

    // Attach a UE to a eNB
    lteHelper->Attach(ueDevs, enbDevs.Get(0));

    // Activate an EPS bearer on all UEs

    for (uint32_t u = 0; u < ueNodes.GetN(); ++u)
    {
        Ptr<NetDevice> ueDevice = ueDevs.Get(u);
        GbrQosInformation qos;
        qos.gbrDl = (m_packetSize.at(u) + 32) * (1000 / m_interval) *
                    8; // bit/s, considering IP, UDP, RLC, PDCP header size
        qos.gbrUl = (m_packetSize.at(u) + 32) * (1000 / m_interval) * 8;
        qos.mbrDl = qos.gbrDl;
        qos.mbrUl = qos.gbrUl;

        EpsBearer::Qci q = EpsBearer::GBR_CONV_VOICE;
        EpsBearer bearer(q, qos);
        lteHelper->ActivateDedicatedEpsBearer(ueDevice, bearer, EpcTft::Default());
    }

    // Install downlink and uplink applications
    uint16_t dlPort = 1234;
    uint16_t ulPort = 2000;
    ApplicationContainer clientApps;
    ApplicationContainer serverApps;
    PacketSinkHelper dlPacketSinkHelper("ns3::UdpSocketFactory",
                                        InetSocketAddress(Ipv4Address::GetAny(), dlPort));

    for (uint32_t u = 0; u < ueNodes.GetN(); ++u)
    {
        ++ulPort;
        PacketSinkHelper ulPacketSinkHelper("ns3::UdpSocketFactory",
                                            InetSocketAddress(Ipv4Address::GetAny(), ulPort));
        serverApps.Add(ulPacketSinkHelper.Install(remoteHost)); // receive packets from UEs
        serverApps.Add(
            dlPacketSinkHelper.Install(ueNodes.Get(u))); // receive packets from remotehost

        UdpClientHelper dlClient(ueIpIface.GetAddress(u), dlPort); // downlink packets generator
        dlClient.SetAttribute("Interval", TimeValue(MilliSeconds(m_interval)));
        dlClient.SetAttribute("MaxPackets", UintegerValue(1000000));
        dlClient.SetAttribute("PacketSize", UintegerValue(m_packetSize.at(u)));

        UdpClientHelper ulClient(remoteHostAddr, ulPort); // uplink packets generator
        ulClient.SetAttribute("Interval", TimeValue(MilliSeconds(m_interval)));
        ulClient.SetAttribute("MaxPackets", UintegerValue(1000000));
        ulClient.SetAttribute("PacketSize", UintegerValue(m_packetSize.at(u)));

        clientApps.Add(dlClient.Install(remoteHost));
        clientApps.Add(ulClient.Install(ueNodes.Get(u)));
    }

    serverApps.Start(Seconds(0.030));
    clientApps.Start(Seconds(0.030));

    double statsStartTime = 0.04; // need to allow for RRC connection establishment + SRS
    double statsDuration = 0.5;
    double tolerance = 0.1;
    Simulator::Stop(Seconds(statsStartTime + statsDuration - 0.0001));

    lteHelper->EnableRlcTraces();
    Ptr<RadioBearerStatsCalculator> rlcStats = lteHelper->GetRlcStats();
    rlcStats->SetAttribute("StartTime", TimeValue(Seconds(statsStartTime)));
    rlcStats->SetAttribute("EpochDuration", TimeValue(Seconds(statsDuration)));

    Simulator::Run();

    /**
     * Check that the downlink resource assignment is done according to CQA algorithm among users
     * with different SINRs
     */

    NS_LOG_INFO("DL - Test with " << m_nUser << " user(s)");
    std::vector<uint64_t> dlDataRxed;
    for (int i = 0; i < m_nUser; i++)
    {
        // get the imsi
        uint64_t imsi = ueDevs.Get(i)->GetObject<LteUeNetDevice>()->GetImsi();
        // get the lcId
        uint8_t lcId = 4;
        dlDataRxed.push_back(rlcStats->GetDlRxData(imsi, lcId));
        NS_LOG_INFO("\tUser " << i << " dist " << m_dist.at(i) << " imsi " << imsi << " bytes rxed "
                              << (double)dlDataRxed.at(i) << "  thr "
                              << (double)dlDataRxed.at(i) / statsDuration << " ref "
                              << m_estThrCqaDl.at(i));
    }

    for (int i = 0; i < m_nUser; i++)
    {
        NS_TEST_ASSERT_MSG_EQ_TOL((double)dlDataRxed.at(i) / statsDuration,
                                  m_estThrCqaDl.at(i),
                                  m_estThrCqaDl.at(i) * tolerance,
                                  " Unfair Throughput!");
    }

    Simulator::Destroy();
}
