wifi-manager-example.cc

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/*
 * Copyright (c) 2016 University of Washington
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 * Authors: Tom Henderson <tomhend@u.washington.edu>
 *          Matías Richart <mrichart@fing.edu.uy>
 *          Sébastien Deronne <sebastien.deronne@gmail.com>
 */
 
// Test the operation of a wifi manager as the SNR is varied, and create
// a gnuplot output file for plotting.
//
// The test consists of a device acting as server and a device as client generating traffic.
//
// The output consists of a plot of the rate observed and selected at the client device.
// A special FixedRss propagation loss model is used to set a specific receive
// power on the receiver.  The noise power is exclusively the thermal noise
// for the channel bandwidth (no noise figure is configured).  Furthermore,
// the CCA sensitivity attribute in WifiPhy can prevent signals from being
// received even though the error model would permit it.  Therefore, for
// the purpose of this example, the CCA sensitivity is lowered to a value
// that disables it, and furthermore, the preamble detection model (which
// also contains a similar threshold) is disabled.
//
// By default, the 802.11a standard using IdealWifiManager is plotted. Several command line
// arguments can change the following options:
// --wifiManager (Aarf, Aarfcd, Amrr, Arf, Cara, Ideal, Minstrel, MinstrelHt, Onoe, Rraa,
// ThompsonSampling)
// --standard (802.11a, 802.11b, 802.11g, 802.11p-10MHz, 802.11p-5MHz, 802.11n-5GHz, 802.11n-2.4GHz,
// 802.11ac, 802.11ax-6GHz, 802.11ax-5GHz, 802.11ax-2.4GHz)
// --serverShortGuardInterval and --clientShortGuardInterval (for 802.11n/ac)
// --serverNss and --clientNss (for 802.11n/ac)
// --serverChannelWidth and --clientChannelWidth (for 802.11n/ac)
// --broadcast instead of unicast (default is unicast)
// --rtsThreshold (by default, value of 99999 disables it)
 
#include "ns3/attribute-container.h"
#include "ns3/boolean.h"
#include "ns3/command-line.h"
#include "ns3/config.h"
#include "ns3/double.h"
#include "ns3/enum.h"
#include "ns3/gnuplot.h"
#include "ns3/he-configuration.h"
#include "ns3/ht-configuration.h"
#include "ns3/log.h"
#include "ns3/mobility-helper.h"
#include "ns3/packet-socket-client.h"
#include "ns3/packet-socket-helper.h"
#include "ns3/packet-socket-server.h"
#include "ns3/propagation-delay-model.h"
#include "ns3/propagation-loss-model.h"
#include "ns3/rng-seed-manager.h"
#include "ns3/ssid.h"
#include "ns3/tuple.h"
#include "ns3/uinteger.h"
#include "ns3/wifi-mac.h"
#include "ns3/wifi-net-device.h"
#include "ns3/yans-wifi-helper.h"
 
using namespace ns3;
 
NS_LOG_COMPONENT_DEFINE("WifiManagerExample");
 
double g_intervalBytes = 0;  //!< Bytes received in an interval.
uint64_t g_intervalRate = 0; //!< Rate in an interval.
 
/**
 * Packet received.
 *
 * \param pkt The packet.
 * \param addr The sender address.
 */
void
PacketRx(Ptr<const Packet> pkt, const Address& addr)
{
    g_intervalBytes += pkt->GetSize();
}
 
/**
 * Rate changed.
 *
 * \param oldVal Old value.
 * \param newVal New value.
 */
void
RateChange(uint64_t oldVal, uint64_t newVal)
{
    NS_LOG_DEBUG("Change from " << oldVal << " to " << newVal);
    g_intervalRate = newVal;
}
 
/// Step structure
struct Step
{
    dBm_u stepSize;  ///< step size
    double stepTime; ///< step size in seconds
};
 
/// StandardInfo structure
struct StandardInfo
{
    StandardInfo()
    {
        m_name = "none";
    }
 
    /**
     * Constructor
     *
     * \param name reference name
     * \param standard wifi standard
     * \param band PHY band
     * \param width channel width
     * \param snrLow SNR low
     * \param snrHigh SNR high
     * \param xMin x minimum
     * \param xMax x maximum
     * \param yMax y maximum
     */
    StandardInfo(std::string name,
                 WifiStandard standard,
                 WifiPhyBand band,
                 MHz_u width,
                 dB_u snrLow,
                 dB_u snrHigh,
                 double xMin,
                 double xMax,
                 double yMax)
        : m_name(name),
          m_standard(standard),
          m_band(band),
          m_width(width),
          m_snrLow(snrLow),
          m_snrHigh(snrHigh),
          m_xMin(xMin),
          m_xMax(xMax),
          m_yMax(yMax)
    {
    }
 
    std::string m_name;      ///< name
    WifiStandard m_standard; ///< standard
    WifiPhyBand m_band;      ///< PHY band
    MHz_u m_width;           ///< channel width
    dB_u m_snrLow;           ///< lowest SNR
    dB_u m_snrHigh;          ///< highest SNR
    double m_xMin;           ///< X minimum
    double m_xMax;           ///< X maximum
    double m_yMax;           ///< Y maximum
};
 
/**
 * Change the signal model and report the rate.
 *
 * \param rssModel The new RSS model.
 * \param step The step to use.
 * \param rss The RSS.
 * \param noise The noise.
 * \param rateDataset The rate dataset.
 * \param actualDataset The actual dataset.
 */
void
ChangeSignalAndReportRate(Ptr<FixedRssLossModel> rssModel,
                          Step step,
                          dBm_u rss,
                          dBm_u noise,
                          Gnuplot2dDataset& rateDataset,
                          Gnuplot2dDataset& actualDataset)
{
    NS_LOG_FUNCTION(rssModel << step.stepSize << step.stepTime << rss);
    dB_u snr = rss - noise;
    rateDataset.Add(snr, g_intervalRate / 1e6);
    // Calculate received rate since last interval
    double currentRate = ((g_intervalBytes * 8) / step.stepTime) / 1e6; // Mb/s
    actualDataset.Add(snr, currentRate);
    rssModel->SetRss(rss - step.stepSize);
    NS_LOG_INFO("At time " << Simulator::Now().As(Time::S) << "; selected rate "
                           << (g_intervalRate / 1e6) << "; observed rate " << currentRate
                           << "; setting new power to " << rss - step.stepSize);
    g_intervalBytes = 0;
    Simulator::Schedule(Seconds(step.stepTime),
                        &ChangeSignalAndReportRate,
                        rssModel,
                        step,
                        (rss - step.stepSize),
                        noise,
                        rateDataset,
                        actualDataset);
}
 
int
main(int argc, char* argv[])
{
    std::vector<StandardInfo> serverStandards;
    std::vector<StandardInfo> clientStandards;
    uint32_t steps;
    uint32_t rtsThreshold = 999999; // disabled even for large A-MPDU
    uint32_t maxAmpduSize = 65535;
    dBm_u stepSize = 1;
    double stepTime = 1;        // seconds
    uint32_t packetSize = 1024; // bytes
    bool broadcast = false;
    int ap1_x = 0;
    int ap1_y = 0;
    int sta1_x = 5;
    int sta1_y = 0;
    uint16_t serverNss = 1;
    uint16_t clientNss = 1;
    uint16_t serverShortGuardInterval = 800;
    uint16_t clientShortGuardInterval = 800;
    uint16_t serverChannelWidth = 0; // use default for standard and band
    uint16_t clientChannelWidth = 0; // use default for standard and band
    std::string wifiManager("Ideal");
    std::string standard("802.11a");
    StandardInfo serverSelectedStandard;
    StandardInfo clientSelectedStandard;
    bool infrastructure = false;
    uint32_t maxSlrc = 7;
    uint32_t maxSsrc = 7;
 
    RngSeedManager::SetSeed(1);
    RngSeedManager::SetRun(2);
 
    CommandLine cmd(__FILE__);
    cmd.AddValue("maxSsrc",
                 "The maximum number of retransmission attempts for a RTS packet",
                 maxSsrc);
    cmd.AddValue("maxSlrc",
                 "The maximum number of retransmission attempts for a Data packet",
                 maxSlrc);
    cmd.AddValue("rtsThreshold", "RTS threshold", rtsThreshold);
    cmd.AddValue("maxAmpduSize", "Max A-MPDU size", maxAmpduSize);
    cmd.AddValue("stepSize", "Power between steps (dBm)", stepSize);
    cmd.AddValue("stepTime", "Time on each step (seconds)", stepTime);
    cmd.AddValue("broadcast", "Send broadcast instead of unicast", broadcast);
    cmd.AddValue("serverChannelWidth",
                 "Set channel width of the server (valid only for 802.11n or ac)",
                 serverChannelWidth);
    cmd.AddValue("clientChannelWidth",
                 "Set channel width of the client (valid only for 802.11n or ac)",
                 clientChannelWidth);
    cmd.AddValue("serverNss", "Set nss of the server (valid only for 802.11n or ac)", serverNss);
    cmd.AddValue("clientNss", "Set nss of the client (valid only for 802.11n or ac)", clientNss);
    cmd.AddValue("serverShortGuardInterval",
                 "Set short guard interval of the server (802.11n/ac/ax) in nanoseconds",
                 serverShortGuardInterval);
    cmd.AddValue("clientShortGuardInterval",
                 "Set short guard interval of the client (802.11n/ac/ax) in nanoseconds",
                 clientShortGuardInterval);
    cmd.AddValue(
        "standard",
        "Set standard (802.11a, 802.11b, 802.11g, 802.11p-10MHz, 802.11p-5MHz, 802.11n-5GHz, "
        "802.11n-2.4GHz, 802.11ac, 802.11ax-6GHz, 802.11ax-5GHz, 802.11ax-2.4GHz)",
        standard);
    cmd.AddValue("wifiManager",
                 "Set wifi rate manager (Aarf, Aarfcd, Amrr, Arf, Cara, Ideal, Minstrel, "
                 "MinstrelHt, Onoe, Rraa, ThompsonSampling)",
                 wifiManager);
    cmd.AddValue("infrastructure", "Use infrastructure instead of adhoc", infrastructure);
    cmd.Parse(argc, argv);
 
    // Print out some explanation of what this program does
    std::cout << std::endl
              << "This program demonstrates and plots the operation of different " << std::endl;
    std::cout << "Wi-Fi rate controls on different station configurations," << std::endl;
    std::cout << "by stepping down the received signal strength across a wide range" << std::endl;
    std::cout << "and observing the adjustment of the rate." << std::endl;
    std::cout << "Run 'wifi-manager-example --PrintHelp' to show program options." << std::endl
              << std::endl;
 
    if (!infrastructure)
    {
        NS_ABORT_MSG_IF(serverNss != clientNss,
                        "In ad hoc mode, we assume sender and receiver are similarly configured");
    }
 
    if (standard == "802.11b")
    {
        if (serverChannelWidth == 0)
        {
            serverChannelWidth = GetDefaultChannelWidth(WIFI_STANDARD_80211b, WIFI_PHY_BAND_2_4GHZ);
        }
        NS_ABORT_MSG_IF(serverChannelWidth != 22,
                        "Invalid channel width for standard " << standard);
        NS_ABORT_MSG_IF(serverNss != 1, "Invalid nss for standard " << standard);
        if (clientChannelWidth == 0)
        {
            clientChannelWidth = GetDefaultChannelWidth(WIFI_STANDARD_80211b, WIFI_PHY_BAND_2_4GHZ);
        }
        NS_ABORT_MSG_IF(clientChannelWidth != 22,
                        "Invalid channel width for standard " << standard);
        NS_ABORT_MSG_IF(clientNss != 1, "Invalid nss for standard " << standard);
    }
    else if (standard == "802.11a" || standard == "802.11g")
    {
        if (serverChannelWidth == 0)
        {
            serverChannelWidth = GetDefaultChannelWidth(WIFI_STANDARD_80211g, WIFI_PHY_BAND_2_4GHZ);
        }
        NS_ABORT_MSG_IF(serverChannelWidth != 20,
                        "Invalid channel width for standard " << standard);
        NS_ABORT_MSG_IF(serverNss != 1, "Invalid nss for standard " << standard);
        if (clientChannelWidth == 0)
        {
            clientChannelWidth = GetDefaultChannelWidth(WIFI_STANDARD_80211g, WIFI_PHY_BAND_2_4GHZ);
        }
        NS_ABORT_MSG_IF(clientChannelWidth != 20,
                        "Invalid channel width for standard " << standard);
        NS_ABORT_MSG_IF(clientNss != 1, "Invalid nss for standard " << standard);
    }
    else if (standard == "802.11n-5GHz" || standard == "802.11n-2.4GHz")
    {
        WifiPhyBand band =
            (standard == "802.11n-2.4GHz" ? WIFI_PHY_BAND_2_4GHZ : WIFI_PHY_BAND_5GHZ);
        if (serverChannelWidth == 0)
        {
            serverChannelWidth = GetDefaultChannelWidth(WIFI_STANDARD_80211n, band);
        }
        NS_ABORT_MSG_IF(serverChannelWidth != 20 && serverChannelWidth != 40,
                        "Invalid channel width for standard " << standard);
        NS_ABORT_MSG_IF(serverNss == 0 || serverNss > 4,
                        "Invalid nss " << serverNss << " for standard " << standard);
        if (clientChannelWidth == 0)
        {
            clientChannelWidth = GetDefaultChannelWidth(WIFI_STANDARD_80211n, band);
        }
        NS_ABORT_MSG_IF(clientChannelWidth != 20 && clientChannelWidth != 40,
                        "Invalid channel width for standard " << standard);
        NS_ABORT_MSG_IF(clientNss == 0 || clientNss > 4,
                        "Invalid nss " << clientNss << " for standard " << standard);
    }
    else if (standard == "802.11ac")
    {
        if (serverChannelWidth == 0)
        {
            serverChannelWidth = GetDefaultChannelWidth(WIFI_STANDARD_80211ac, WIFI_PHY_BAND_5GHZ);
        }
        NS_ABORT_MSG_IF(serverChannelWidth != 20 && serverChannelWidth != 40 &&
                            serverChannelWidth != 80 && serverChannelWidth != 160,
                        "Invalid channel width for standard " << standard);
        NS_ABORT_MSG_IF(serverNss == 0 || serverNss > 4,
                        "Invalid nss " << serverNss << " for standard " << standard);
        if (clientChannelWidth == 0)
        {
            clientChannelWidth = GetDefaultChannelWidth(WIFI_STANDARD_80211ac, WIFI_PHY_BAND_5GHZ);
        }
        NS_ABORT_MSG_IF(clientChannelWidth != 20 && clientChannelWidth != 40 &&
                            clientChannelWidth != 80 && clientChannelWidth != 160,
                        "Invalid channel width for standard " << standard);
        NS_ABORT_MSG_IF(clientNss == 0 || clientNss > 4,
                        "Invalid nss " << clientNss << " for standard " << standard);
    }
    else if (standard == "802.11ax-6GHz" || standard == "802.11ax-5GHz" ||
             standard == "802.11ax-2.4GHz")
    {
        WifiPhyBand band = (standard == "802.11ax-2.4GHz" ? WIFI_PHY_BAND_2_4GHZ
                            : standard == "802.11ax-6GHz" ? WIFI_PHY_BAND_6GHZ
                                                          : WIFI_PHY_BAND_5GHZ);
        if (serverChannelWidth == 0)
        {
            serverChannelWidth = GetDefaultChannelWidth(WIFI_STANDARD_80211ax, band);
        }
        NS_ABORT_MSG_IF(serverChannelWidth != 20 && serverChannelWidth != 40 &&
                            serverChannelWidth != 80 && serverChannelWidth != 160,
                        "Invalid channel width for standard " << standard);
        NS_ABORT_MSG_IF(serverNss == 0 || serverNss > 4,
                        "Invalid nss " << serverNss << " for standard " << standard);
        if (clientChannelWidth == 0)
        {
            clientChannelWidth = GetDefaultChannelWidth(WIFI_STANDARD_80211ax, band);
        }
        NS_ABORT_MSG_IF(clientChannelWidth != 20 && clientChannelWidth != 40 &&
                            clientChannelWidth != 80 && clientChannelWidth != 160,
                        "Invalid channel width for standard " << standard);
        NS_ABORT_MSG_IF(clientNss == 0 || clientNss > 4,
                        "Invalid nss " << clientNss << " for standard " << standard);
    }
 
    // As channel width increases, scale up plot's yRange value
    uint32_t channelRateFactor = std::max(clientChannelWidth, serverChannelWidth) / 20;
    channelRateFactor = channelRateFactor * std::max(clientNss, serverNss);
 
    // The first number is channel width, second is minimum SNR, third is maximum
    // SNR, fourth and fifth provide xrange axis limits, and sixth the yaxis
    // maximum
    serverStandards = {
        StandardInfo("802.11a", WIFI_STANDARD_80211a, WIFI_PHY_BAND_5GHZ, 20, 3, 27, 0, 30, 60),
        StandardInfo("802.11b", WIFI_STANDARD_80211b, WIFI_PHY_BAND_2_4GHZ, 22, -5, 11, -6, 15, 15),
        StandardInfo("802.11g", WIFI_STANDARD_80211g, WIFI_PHY_BAND_2_4GHZ, 20, -5, 27, -6, 30, 60),
        StandardInfo("802.11n-5GHz",
                     WIFI_STANDARD_80211n,
                     WIFI_PHY_BAND_5GHZ,
                     serverChannelWidth,
                     3,
                     30,
                     0,
                     35,
                     80 * channelRateFactor),
        StandardInfo("802.11n-2.4GHz",
                     WIFI_STANDARD_80211n,
                     WIFI_PHY_BAND_2_4GHZ,
                     serverChannelWidth,
                     3,
                     30,
                     0,
                     35,
                     80 * channelRateFactor),
        StandardInfo("802.11ac",
                     WIFI_STANDARD_80211ac,
                     WIFI_PHY_BAND_5GHZ,
                     serverChannelWidth,
                     5,
                     50,
                     0,
                     55,
                     120 * channelRateFactor),
        StandardInfo("802.11p-10MHz",
                     WIFI_STANDARD_80211p,
                     WIFI_PHY_BAND_5GHZ,
                     10,
                     3,
                     27,
                     0,
                     30,
                     60),
        StandardInfo("802.11p-5MHz", WIFI_STANDARD_80211p, WIFI_PHY_BAND_5GHZ, 5, 3, 27, 0, 30, 60),
        StandardInfo("802.11ax-6GHz",
                     WIFI_STANDARD_80211ax,
                     WIFI_PHY_BAND_6GHZ,
                     serverChannelWidth,
                     5,
                     55,
                     0,
                     60,
                     120 * channelRateFactor),
        StandardInfo("802.11ax-5GHz",
                     WIFI_STANDARD_80211ax,
                     WIFI_PHY_BAND_5GHZ,
                     serverChannelWidth,
                     5,
                     55,
                     0,
                     60,
                     120 * channelRateFactor),
        StandardInfo("802.11ax-2.4GHz",
                     WIFI_STANDARD_80211ax,
                     WIFI_PHY_BAND_2_4GHZ,
                     serverChannelWidth,
                     5,
                     55,
                     0,
                     60,
                     120 * channelRateFactor),
    };
 
    clientStandards = {
        StandardInfo("802.11a", WIFI_STANDARD_80211a, WIFI_PHY_BAND_5GHZ, 20, 3, 27, 0, 30, 60),
        StandardInfo("802.11b", WIFI_STANDARD_80211b, WIFI_PHY_BAND_2_4GHZ, 22, -5, 11, -6, 15, 15),
        StandardInfo("802.11g", WIFI_STANDARD_80211g, WIFI_PHY_BAND_2_4GHZ, 20, -5, 27, -6, 30, 60),
        StandardInfo("802.11n-5GHz",
                     WIFI_STANDARD_80211n,
                     WIFI_PHY_BAND_5GHZ,
                     clientChannelWidth,
                     3,
                     30,
                     0,
                     35,
                     80 * channelRateFactor),
        StandardInfo("802.11n-2.4GHz",
                     WIFI_STANDARD_80211n,
                     WIFI_PHY_BAND_2_4GHZ,
                     clientChannelWidth,
                     3,
                     30,
                     0,
                     35,
                     80 * channelRateFactor),
        StandardInfo("802.11ac",
                     WIFI_STANDARD_80211ac,
                     WIFI_PHY_BAND_5GHZ,
                     clientChannelWidth,
                     5,
                     50,
                     0,
                     55,
                     120 * channelRateFactor),
        StandardInfo("802.11p-10MHz",
                     WIFI_STANDARD_80211p,
                     WIFI_PHY_BAND_5GHZ,
                     10,
                     3,
                     27,
                     0,
                     30,
                     60),
        StandardInfo("802.11p-5MHz", WIFI_STANDARD_80211p, WIFI_PHY_BAND_5GHZ, 5, 3, 27, 0, 30, 60),
        StandardInfo("802.11ax-6GHz",
                     WIFI_STANDARD_80211ax,
                     WIFI_PHY_BAND_6GHZ,
                     clientChannelWidth,
                     5,
                     55,
                     0,
                     60,
                     160 * channelRateFactor),
        StandardInfo("802.11ax-5GHz",
                     WIFI_STANDARD_80211ax,
                     WIFI_PHY_BAND_5GHZ,
                     clientChannelWidth,
                     5,
                     55,
                     0,
                     60,
                     160 * channelRateFactor),
        StandardInfo("802.11ax-2.4GHz",
                     WIFI_STANDARD_80211ax,
                     WIFI_PHY_BAND_2_4GHZ,
                     clientChannelWidth,
                     5,
                     55,
                     0,
                     60,
                     160 * channelRateFactor),
    };
 
    for (std::vector<StandardInfo>::size_type i = 0; i != serverStandards.size(); i++)
    {
        if (standard == serverStandards[i].m_name)
        {
            serverSelectedStandard = serverStandards[i];
        }
    }
    for (std::vector<StandardInfo>::size_type i = 0; i != clientStandards.size(); i++)
    {
        if (standard == clientStandards[i].m_name)
        {
            clientSelectedStandard = clientStandards[i];
        }
    }
 
    NS_ABORT_MSG_IF(serverSelectedStandard.m_name == "none",
                    "Standard " << standard << " not found");
    NS_ABORT_MSG_IF(clientSelectedStandard.m_name == "none",
                    "Standard " << standard << " not found");
    std::cout << "Testing " << serverSelectedStandard.m_name << " with " << wifiManager << " ..."
              << std::endl;
    NS_ABORT_MSG_IF(clientSelectedStandard.m_snrLow >= clientSelectedStandard.m_snrHigh,
                    "SNR values in wrong order");
    steps = static_cast<uint32_t>(std::abs(static_cast<double>(clientSelectedStandard.m_snrHigh -
                                                               clientSelectedStandard.m_snrLow) /
                                           stepSize) +
                                  1);
    NS_LOG_DEBUG("Using " << steps << " steps for SNR range " << clientSelectedStandard.m_snrLow
                          << ":" << clientSelectedStandard.m_snrHigh);
    Ptr<Node> clientNode = CreateObject<Node>();
    Ptr<Node> serverNode = CreateObject<Node>();
 
    std::string plotName = "wifi-manager-example-";
    std::string dataName = "wifi-manager-example-";
    plotName += wifiManager;
    dataName += wifiManager;
    plotName += "-";
    dataName += "-";
    plotName += standard;
    dataName += standard;
    if (standard == "802.11n-5GHz" || standard == "802.11n-2.4GHz" || standard == "802.11ac" ||
        standard == "802.11ax-6GHz" || standard == "802.11ax-5GHz" || standard == "802.11ax-2.4GHz")
    {
        plotName += "-server_";
        dataName += "-server_";
        std::ostringstream oss;
        oss << serverChannelWidth << "MHz_" << serverShortGuardInterval << "ns_" << serverNss
            << "SS";
        plotName += oss.str();
        dataName += oss.str();
        plotName += "-client_";
        dataName += "-client_";
        oss.str("");
        oss << clientChannelWidth << "MHz_" << clientShortGuardInterval << "ns_" << clientNss
            << "SS";
        plotName += oss.str();
        dataName += oss.str();
    }
    plotName += ".eps";
    dataName += ".plt";
    std::ofstream outfile(dataName);
    Gnuplot gnuplot = Gnuplot(plotName);
 
    Config::SetDefault("ns3::WifiRemoteStationManager::MaxSlrc", UintegerValue(maxSlrc));
    Config::SetDefault("ns3::WifiRemoteStationManager::MaxSsrc", UintegerValue(maxSsrc));
    Config::SetDefault("ns3::MinstrelWifiManager::PrintStats", BooleanValue(true));
    Config::SetDefault("ns3::MinstrelWifiManager::PrintSamples", BooleanValue(true));
    Config::SetDefault("ns3::MinstrelHtWifiManager::PrintStats", BooleanValue(true));
 
    // Disable the default noise figure of 7 dBm in WifiPhy; the calculations
    // of SNR below assume that the only noise is thermal noise
    Config::SetDefault("ns3::WifiPhy::RxNoiseFigure", DoubleValue(0));
 
    // By default, the CCA sensitivity is -82 dBm, meaning if the RSS is
    // below this value, the receiver will reject the Wi-Fi frame.
    // However, we want to probe the error model down to low SNR values,
    // and we have disabled the noise figure, so the noise level in 20 MHz
    // will be about -101 dBm.  Therefore, lower the CCA sensitivity to a
    // value that disables it (e.g. -110 dBm)
    Config::SetDefault("ns3::WifiPhy::CcaSensitivity", DoubleValue(-110));
 
    WifiHelper wifi;
    wifi.SetStandard(serverSelectedStandard.m_standard);
    YansWifiPhyHelper wifiPhy;
    // Disable the preamble detection model for the same reason that we
    // disabled CCA sensitivity above-- we want to enable reception at low SNR
    wifiPhy.DisablePreambleDetectionModel();
 
    Ptr<YansWifiChannel> wifiChannel = CreateObject<YansWifiChannel>();
    Ptr<ConstantSpeedPropagationDelayModel> delayModel =
        CreateObject<ConstantSpeedPropagationDelayModel>();
    wifiChannel->SetPropagationDelayModel(delayModel);
    Ptr<FixedRssLossModel> rssLossModel = CreateObject<FixedRssLossModel>();
    wifiChannel->SetPropagationLossModel(rssLossModel);
    wifiPhy.SetChannel(wifiChannel);
 
    wifi.SetRemoteStationManager("ns3::" + wifiManager + "WifiManager",
                                 "RtsCtsThreshold",
                                 UintegerValue(rtsThreshold));
 
    NetDeviceContainer serverDevice;
    NetDeviceContainer clientDevice;
 
    AttributeContainerValue<
        TupleValue<UintegerValue, UintegerValue, EnumValue<WifiPhyBand>, UintegerValue>,
        ';'>
        channelValue;
 
    WifiMacHelper wifiMac;
    if (infrastructure)
    {
        Ssid ssid = Ssid("ns-3-ssid");
        wifiMac.SetType("ns3::StaWifiMac", "Ssid", SsidValue(ssid));
        channelValue.Set(WifiPhy::ChannelSegments{
            {0, serverSelectedStandard.m_width, serverSelectedStandard.m_band, 0}});
        wifiPhy.Set("ChannelSettings", channelValue);
        serverDevice = wifi.Install(wifiPhy, wifiMac, serverNode);
 
        wifiMac.SetType("ns3::ApWifiMac", "Ssid", SsidValue(ssid));
        channelValue.Set(WifiPhy::ChannelSegments{
            {0, clientSelectedStandard.m_width, clientSelectedStandard.m_band, 0}});
        wifiPhy.Set("ChannelSettings", channelValue);
        clientDevice = wifi.Install(wifiPhy, wifiMac, clientNode);
    }
    else
    {
        wifiMac.SetType("ns3::AdhocWifiMac");
        channelValue.Set(WifiPhy::ChannelSegments{
            {0, serverSelectedStandard.m_width, serverSelectedStandard.m_band, 0}});
        wifiPhy.Set("ChannelSettings", channelValue);
        serverDevice = wifi.Install(wifiPhy, wifiMac, serverNode);
 
        channelValue.Set(WifiPhy::ChannelSegments{
            {0, clientSelectedStandard.m_width, clientSelectedStandard.m_band, 0}});
        wifiPhy.Set("ChannelSettings", channelValue);
        clientDevice = wifi.Install(wifiPhy, wifiMac, clientNode);
    }
 
    WifiHelper::AssignStreams(serverDevice, 100);
    WifiHelper::AssignStreams(clientDevice, 200);
 
    Config::Set("/NodeList/*/DeviceList/*/$ns3::WifiNetDevice/Mac/BE_MaxAmpduSize",
                UintegerValue(maxAmpduSize));
 
    Config::ConnectWithoutContext(
        "/NodeList/0/DeviceList/*/$ns3::WifiNetDevice/RemoteStationManager/$ns3::" + wifiManager +
            "WifiManager/Rate",
        MakeCallback(&RateChange));
 
    // Configure the mobility.
    MobilityHelper mobility;
    Ptr<ListPositionAllocator> positionAlloc = CreateObject<ListPositionAllocator>();
    // Initial position of AP and STA
    positionAlloc->Add(Vector(ap1_x, ap1_y, 0.0));
    NS_LOG_INFO("Setting initial AP position to " << Vector(ap1_x, ap1_y, 0.0));
    positionAlloc->Add(Vector(sta1_x, sta1_y, 0.0));
    NS_LOG_INFO("Setting initial STA position to " << Vector(sta1_x, sta1_y, 0.0));
    mobility.SetPositionAllocator(positionAlloc);
    mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
    mobility.Install(clientNode);
    mobility.Install(serverNode);
 
    Gnuplot2dDataset rateDataset(clientSelectedStandard.m_name + std::string("-rate selected"));
    Gnuplot2dDataset actualDataset(clientSelectedStandard.m_name + std::string("-observed"));
    Step step;
    step.stepSize = stepSize;
    step.stepTime = stepTime;
 
    // Perform post-install configuration from defaults for channel width,
    // guard interval, and nss, if necessary
    // Obtain pointer to the WifiPhy
    Ptr<NetDevice> ndClient = clientDevice.Get(0);
    Ptr<NetDevice> ndServer = serverDevice.Get(0);
    Ptr<WifiNetDevice> wndClient = ndClient->GetObject<WifiNetDevice>();
    Ptr<WifiNetDevice> wndServer = ndServer->GetObject<WifiNetDevice>();
    Ptr<WifiPhy> wifiPhyPtrClient = wndClient->GetPhy();
    Ptr<WifiPhy> wifiPhyPtrServer = wndServer->GetPhy();
    auto t_clientNss = static_cast<uint8_t>(clientNss);
    auto t_serverNss = static_cast<uint8_t>(serverNss);
    wifiPhyPtrClient->SetNumberOfAntennas(t_clientNss);
    wifiPhyPtrClient->SetMaxSupportedTxSpatialStreams(t_clientNss);
    wifiPhyPtrClient->SetMaxSupportedRxSpatialStreams(t_clientNss);
    wifiPhyPtrServer->SetNumberOfAntennas(t_serverNss);
    wifiPhyPtrServer->SetMaxSupportedTxSpatialStreams(t_serverNss);
    wifiPhyPtrServer->SetMaxSupportedRxSpatialStreams(t_serverNss);
    // Only set the guard interval for HT and VHT modes
    if (serverSelectedStandard.m_name == "802.11n-5GHz" ||
        serverSelectedStandard.m_name == "802.11n-2.4GHz" ||
        serverSelectedStandard.m_name == "802.11ac")
    {
        Ptr<HtConfiguration> clientHtConfiguration = wndClient->GetHtConfiguration();
        clientHtConfiguration->SetShortGuardIntervalSupported(clientShortGuardInterval == 400);
        Ptr<HtConfiguration> serverHtConfiguration = wndServer->GetHtConfiguration();
        serverHtConfiguration->SetShortGuardIntervalSupported(serverShortGuardInterval == 400);
    }
    else if (serverSelectedStandard.m_name == "802.11ax-6GHz" ||
             serverSelectedStandard.m_name == "802.11ax-5GHz" ||
             serverSelectedStandard.m_name == "802.11ax-2.4GHz")
    {
        wndServer->GetHeConfiguration()->SetGuardInterval(NanoSeconds(serverShortGuardInterval));
        wndClient->GetHeConfiguration()->SetGuardInterval(NanoSeconds(clientShortGuardInterval));
    }
 
    // Configure signal and noise, and schedule first iteration
    const auto BOLTZMANN = 1.3803e-23;
    const dBm_per_Hz_u noiseDensity = WToDbm(BOLTZMANN * 290); // 290K @ 20 MHz
    const dBm_u noise = noiseDensity + (10 * log10(clientSelectedStandard.m_width * 1000000));
 
    NS_LOG_DEBUG("Channel width " << wifiPhyPtrClient->GetChannelWidth() << " noise " << noise);
    NS_LOG_DEBUG("NSS " << wifiPhyPtrClient->GetMaxSupportedTxSpatialStreams());
 
    const dBm_u rssCurrent = (clientSelectedStandard.m_snrHigh + noise);
    rssLossModel->SetRss(rssCurrent);
    NS_LOG_INFO("Setting initial Rss to " << rssCurrent);
    // Move the STA by stepsSize meters every stepTime seconds
    Simulator::Schedule(Seconds(0.5 + stepTime),
                        &ChangeSignalAndReportRate,
                        rssLossModel,
                        step,
                        rssCurrent,
                        noise,
                        rateDataset,
                        actualDataset);
 
    PacketSocketHelper packetSocketHelper;
    packetSocketHelper.Install(serverNode);
    packetSocketHelper.Install(clientNode);
 
    PacketSocketAddress socketAddr;
    socketAddr.SetSingleDevice(serverDevice.Get(0)->GetIfIndex());
    if (broadcast)
    {
        socketAddr.SetPhysicalAddress(serverDevice.Get(0)->GetBroadcast());
    }
    else
    {
        socketAddr.SetPhysicalAddress(serverDevice.Get(0)->GetAddress());
    }
    // Arbitrary protocol type.
    // Note: PacketSocket doesn't have any L4 multiplexing or demultiplexing
    //       The only mux/demux is based on the protocol field
    socketAddr.SetProtocol(1);
 
    Ptr<PacketSocketClient> client = CreateObject<PacketSocketClient>();
    client->SetRemote(socketAddr);
    client->SetStartTime(Seconds(0.5));                   // allow simulation warmup
    client->SetAttribute("MaxPackets", UintegerValue(0)); // unlimited
    client->SetAttribute("PacketSize", UintegerValue(packetSize));
 
    // Set a maximum rate 10% above the yMax specified for the selected standard
    double rate = clientSelectedStandard.m_yMax * 1e6 * 1.10;
    double clientInterval = static_cast<double>(packetSize) * 8 / rate;
    NS_LOG_DEBUG("Setting interval to " << clientInterval << " sec for rate of " << rate
                                        << " bits/sec");
 
    client->SetAttribute("Interval", TimeValue(Seconds(clientInterval)));
    clientNode->AddApplication(client);
 
    Ptr<PacketSocketServer> server = CreateObject<PacketSocketServer>();
    server->SetLocal(socketAddr);
    server->TraceConnectWithoutContext("Rx", MakeCallback(&PacketRx));
    serverNode->AddApplication(server);
 
    Simulator::Stop(Seconds((steps + 1) * stepTime));
    Simulator::Run();
 
    if (serverSelectedStandard.m_standard >= WIFI_STANDARD_80211n)
    {
        NS_ABORT_MSG_UNLESS(wndClient->GetMac()->GetBaAgreementEstablishedAsOriginator(
                                wndServer->GetMac()->GetAddress(),
                                0),
                            "Expected BA agreement established for standard "
                                << serverSelectedStandard.m_standard);
    }
 
    Simulator::Destroy();
 
    gnuplot.AddDataset(rateDataset);
    gnuplot.AddDataset(actualDataset);
 
    std::ostringstream xMinStr;
    std::ostringstream xMaxStr;
    std::ostringstream yMaxStr;
    std::string xRangeStr("set xrange [");
    xMinStr << clientSelectedStandard.m_xMin;
    xRangeStr.append(xMinStr.str());
    xRangeStr.append(":");
    xMaxStr << clientSelectedStandard.m_xMax;
    xRangeStr.append(xMaxStr.str());
    xRangeStr.append("]");
    std::string yRangeStr("set yrange [0:");
    yMaxStr << clientSelectedStandard.m_yMax;
    yRangeStr.append(yMaxStr.str());
    yRangeStr.append("]");
 
    std::string title("Results for ");
    title.append(standard);
    title.append(" with ");
    title.append(wifiManager);
    title.append("\\n");
    if (standard == "802.11n-5GHz" || standard == "802.11n-2.4GHz" || standard == "802.11ac" ||
        standard == "802.11ax-6GHz" || standard == "802.11ax-5GHz" || standard == "802.11ax-2.4GHz")
    {
        std::ostringstream serverGiStrStr;
        std::ostringstream serverWidthStrStr;
        std::ostringstream serverNssStrStr;
        title.append("server: width=");
        serverWidthStrStr << serverSelectedStandard.m_width;
        title.append(serverWidthStrStr.str());
        title.append("MHz");
        title.append(" GI=");
        serverGiStrStr << serverShortGuardInterval;
        title.append(serverGiStrStr.str());
        title.append("ns");
        title.append(" nss=");
        serverNssStrStr << serverNss;
        title.append(serverNssStrStr.str());
        title.append("\\n");
        std::ostringstream clientGiStrStr;
        std::ostringstream clientWidthStrStr;
        std::ostringstream clientNssStrStr;
        title.append("client: width=");
        clientWidthStrStr << clientSelectedStandard.m_width;
        title.append(clientWidthStrStr.str());
        title.append("MHz");
        title.append(" GI=");
        clientGiStrStr << clientShortGuardInterval;
        title.append(clientGiStrStr.str());
        title.append("ns");
        title.append(" nss=");
        clientNssStrStr << clientNss;
        title.append(clientNssStrStr.str());
    }
    gnuplot.SetTerminal("postscript eps color enh \"Times-BoldItalic\"");
    gnuplot.SetLegend("SNR (dB)", "Rate (Mb/s)");
    gnuplot.SetTitle(title);
    gnuplot.SetExtra(xRangeStr);
    gnuplot.AppendExtra(yRangeStr);
    gnuplot.AppendExtra("set key top left");
    gnuplot.GenerateOutput(outfile);
    outfile.close();
 
    return 0;
}