431 lines
17 KiB
C++
431 lines
17 KiB
C++
/*
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* Copyright (c) 2015 SEBASTIEN DERONNE
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*
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* Author: Sebastien Deronne <sebastien.deronne@gmail.com>
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*/
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#include "ns3/attribute-container.h"
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#include "ns3/boolean.h"
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#include "ns3/command-line.h"
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#include "ns3/config.h"
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#include "ns3/double.h"
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#include "ns3/internet-stack-helper.h"
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#include "ns3/ipv4-address-helper.h"
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#include "ns3/ipv4-global-routing-helper.h"
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#include "ns3/log.h"
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#include "ns3/mobility-helper.h"
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#include "ns3/multi-model-spectrum-channel.h"
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#include "ns3/on-off-helper.h"
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#include "ns3/packet-sink-helper.h"
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#include "ns3/packet-sink.h"
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#include "ns3/spectrum-wifi-helper.h"
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#include "ns3/ssid.h"
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#include "ns3/string.h"
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#include "ns3/udp-client-server-helper.h"
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#include "ns3/udp-server.h"
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#include "ns3/uinteger.h"
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#include "ns3/vht-phy.h"
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#include "ns3/yans-wifi-channel.h"
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#include "ns3/yans-wifi-helper.h"
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#include <algorithm>
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#include <vector>
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// This is a simple example in order to show how to configure an IEEE 802.11ac Wi-Fi network.
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//
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// It outputs the UDP or TCP goodput for every VHT MCS value, which depends on the MCS value (0 to
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// 9, where 9 is forbidden when the channel width is 20 MHz), the channel width (20, 40, 80 or 160
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// MHz) and the guard interval (long or short). The PHY bitrate is constant over all the simulation
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// run. The user can also specify the distance between the access point and the station: the larger
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// the distance the smaller the goodput.
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//
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// The simulation assumes a single station in an infrastructure network:
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//
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// STA AP
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// * *
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// | |
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// n1 n2
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//
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// Packets in this simulation belong to BestEffort Access Class (AC_BE).
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using namespace ns3;
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NS_LOG_COMPONENT_DEFINE("vht-wifi-network");
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int
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main(int argc, char* argv[])
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{
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bool udp{true};
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bool useRts{false};
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bool use80Plus80{false};
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Time simulationTime{"10s"};
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meter_u distance{1.0};
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std::string mcsStr;
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std::vector<uint64_t> mcsValues;
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std::string phyModel{"Yans"};
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int channelWidth{-1}; // in MHz, -1 indicates an unset value
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int guardInterval{-1}; // in nanoseconds, -1 indicates an unset value
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double minExpectedThroughput{0.0};
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double maxExpectedThroughput{0.0};
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CommandLine cmd(__FILE__);
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cmd.AddValue("distance",
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"Distance in meters between the station and the access point",
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distance);
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cmd.AddValue("simulationTime", "Simulation time", simulationTime);
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cmd.AddValue("udp", "UDP if set to 1, TCP otherwise", udp);
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cmd.AddValue("useRts", "Enable/disable RTS/CTS", useRts);
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cmd.AddValue("use80Plus80", "Enable/disable use of 80+80 MHz", use80Plus80);
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cmd.AddValue(
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"mcs",
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"list of comma separated MCS values to test; if unset, all MCS values (0-9) are tested",
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mcsStr);
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cmd.AddValue("phyModel",
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"PHY model to use (Yans or Spectrum). If 80+80 MHz is enabled, then Spectrum is "
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"automatically selected",
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phyModel);
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cmd.AddValue("channelWidth",
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"if set, limit testing to a specific channel width expressed in MHz (20, 40, 80 "
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"or 160 MHz)",
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channelWidth);
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cmd.AddValue("guardInterval",
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"if set, limit testing to a specific guard interval duration expressed in "
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"nanoseconds (800 or 400 ns)",
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guardInterval);
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cmd.AddValue("minExpectedThroughput",
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"if set, simulation fails if the lowest throughput is below this value",
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minExpectedThroughput);
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cmd.AddValue("maxExpectedThroughput",
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"if set, simulation fails if the highest throughput is above this value",
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maxExpectedThroughput);
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cmd.Parse(argc, argv);
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if (phyModel != "Yans" && phyModel != "Spectrum")
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{
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NS_ABORT_MSG("Invalid PHY model (must be Yans or Spectrum)");
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}
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if (use80Plus80)
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{
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// SpectrumWifiPhy is required for 80+80 MHz
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phyModel = "Spectrum";
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}
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if (useRts)
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{
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Config::SetDefault("ns3::WifiRemoteStationManager::RtsCtsThreshold", StringValue("0"));
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}
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double prevThroughput[8] = {0};
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std::cout << "MCS value"
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<< "\t\t"
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<< "Channel width"
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<< "\t\t"
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<< "short GI"
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<< "\t\t"
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<< "Throughput" << '\n';
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uint8_t minMcs = 0;
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uint8_t maxMcs = 9;
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if (mcsStr.empty())
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{
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for (uint8_t mcs = minMcs; mcs <= maxMcs; ++mcs)
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{
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mcsValues.push_back(mcs);
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}
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}
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else
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{
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AttributeContainerValue<UintegerValue, ',', std::vector> attr;
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auto checker = DynamicCast<AttributeContainerChecker>(MakeAttributeContainerChecker(attr));
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checker->SetItemChecker(MakeUintegerChecker<uint8_t>());
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attr.DeserializeFromString(mcsStr, checker);
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mcsValues = attr.Get();
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std::sort(mcsValues.begin(), mcsValues.end());
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}
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int minChannelWidth = 20;
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int maxChannelWidth = 160;
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if ((channelWidth != -1) &&
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((channelWidth < minChannelWidth) || (channelWidth > maxChannelWidth)))
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{
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NS_FATAL_ERROR("Invalid channel width: " << channelWidth << " MHz");
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}
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if (channelWidth >= minChannelWidth && channelWidth <= maxChannelWidth)
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{
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minChannelWidth = channelWidth;
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maxChannelWidth = channelWidth;
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}
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int minGi = 400;
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int maxGi = 800;
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if (guardInterval >= minGi && guardInterval <= maxGi)
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{
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minGi = guardInterval;
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maxGi = guardInterval;
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}
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for (const auto mcs : mcsValues)
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{
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uint8_t index = 0;
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double previous = 0;
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for (int width = minChannelWidth; width <= maxChannelWidth; width *= 2) // MHz
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{
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if (mcs == 9 && width == 20)
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{
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continue;
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}
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const auto is80Plus80 = (use80Plus80 && (width == 160));
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const std::string widthStr = is80Plus80 ? "80+80" : std::to_string(width);
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const auto segmentWidthStr = is80Plus80 ? "80" : widthStr;
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for (int gi = maxGi; gi >= minGi; gi /= 2) // Nanoseconds
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{
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const auto sgi = (gi == 400);
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uint32_t payloadSize; // 1500 byte IP packet
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if (udp)
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{
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payloadSize = 1472; // bytes
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}
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else
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{
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payloadSize = 1448; // bytes
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Config::SetDefault("ns3::TcpSocket::SegmentSize", UintegerValue(payloadSize));
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}
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NodeContainer wifiStaNode;
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wifiStaNode.Create(1);
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NodeContainer wifiApNode;
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wifiApNode.Create(1);
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NetDeviceContainer apDevice;
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NetDeviceContainer staDevice;
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WifiMacHelper mac;
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WifiHelper wifi;
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std::string channelStr{"{0, " + segmentWidthStr + ", BAND_5GHZ, 0}"};
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std::ostringstream ossControlMode;
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auto nonHtRefRateMbps = VhtPhy::GetNonHtReferenceRate(mcs) / 1e6;
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ossControlMode << "OfdmRate" << nonHtRefRateMbps << "Mbps";
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std::ostringstream ossDataMode;
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ossDataMode << "VhtMcs" << mcs;
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if (is80Plus80)
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{
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channelStr += std::string(";") + channelStr;
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}
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wifi.SetStandard(WIFI_STANDARD_80211ac);
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wifi.SetRemoteStationManager("ns3::ConstantRateWifiManager",
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"DataMode",
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StringValue(ossDataMode.str()),
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"ControlMode",
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StringValue(ossControlMode.str()));
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// Set guard interval
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wifi.ConfigHtOptions("ShortGuardIntervalSupported", BooleanValue(sgi));
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Ssid ssid = Ssid("ns3-80211ac");
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if (phyModel == "Spectrum")
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{
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auto spectrumChannel = CreateObject<MultiModelSpectrumChannel>();
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auto lossModel = CreateObject<LogDistancePropagationLossModel>();
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spectrumChannel->AddPropagationLossModel(lossModel);
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SpectrumWifiPhyHelper phy;
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phy.SetPcapDataLinkType(WifiPhyHelper::DLT_IEEE802_11_RADIO);
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phy.SetChannel(spectrumChannel);
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phy.Set("ChannelSettings",
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StringValue("{0, " + std::to_string(width) + ", BAND_5GHZ, 0}"));
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mac.SetType("ns3::StaWifiMac", "Ssid", SsidValue(ssid));
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staDevice = wifi.Install(phy, mac, wifiStaNode);
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mac.SetType("ns3::ApWifiMac",
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"EnableBeaconJitter",
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BooleanValue(false),
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"Ssid",
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SsidValue(ssid));
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apDevice = wifi.Install(phy, mac, wifiApNode);
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}
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else
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{
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auto channel = YansWifiChannelHelper::Default();
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YansWifiPhyHelper phy;
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phy.SetPcapDataLinkType(WifiPhyHelper::DLT_IEEE802_11_RADIO);
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phy.SetChannel(channel.Create());
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phy.Set("ChannelSettings",
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StringValue("{0, " + std::to_string(width) + ", BAND_5GHZ, 0}"));
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mac.SetType("ns3::StaWifiMac", "Ssid", SsidValue(ssid));
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staDevice = wifi.Install(phy, mac, wifiStaNode);
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mac.SetType("ns3::ApWifiMac",
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"EnableBeaconJitter",
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BooleanValue(false),
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"Ssid",
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SsidValue(ssid));
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apDevice = wifi.Install(phy, mac, wifiApNode);
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}
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int64_t streamNumber = 150;
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streamNumber += WifiHelper::AssignStreams(apDevice, streamNumber);
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streamNumber += WifiHelper::AssignStreams(staDevice, streamNumber);
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// mobility.
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MobilityHelper mobility;
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Ptr<ListPositionAllocator> positionAlloc = CreateObject<ListPositionAllocator>();
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positionAlloc->Add(Vector(0.0, 0.0, 0.0));
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positionAlloc->Add(Vector(distance, 0.0, 0.0));
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mobility.SetPositionAllocator(positionAlloc);
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mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
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mobility.Install(wifiApNode);
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mobility.Install(wifiStaNode);
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/* Internet stack*/
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InternetStackHelper stack;
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stack.Install(wifiApNode);
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stack.Install(wifiStaNode);
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streamNumber += stack.AssignStreams(wifiApNode, streamNumber);
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streamNumber += stack.AssignStreams(wifiStaNode, streamNumber);
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Ipv4AddressHelper address;
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address.SetBase("192.168.1.0", "255.255.255.0");
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Ipv4InterfaceContainer staNodeInterface;
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Ipv4InterfaceContainer apNodeInterface;
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staNodeInterface = address.Assign(staDevice);
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apNodeInterface = address.Assign(apDevice);
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/* Setting applications */
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const auto maxLoad = VhtPhy::GetDataRate(mcs,
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MHz_u{static_cast<double>(width)},
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NanoSeconds(sgi ? 400 : 800),
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1);
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ApplicationContainer serverApp;
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if (udp)
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{
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// UDP flow
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uint16_t port = 9;
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UdpServerHelper server(port);
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serverApp = server.Install(wifiStaNode.Get(0));
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streamNumber += server.AssignStreams(wifiStaNode.Get(0), streamNumber);
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serverApp.Start(Seconds(0));
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serverApp.Stop(simulationTime + Seconds(1));
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const auto packetInterval = payloadSize * 8.0 / maxLoad;
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UdpClientHelper client(staNodeInterface.GetAddress(0), port);
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client.SetAttribute("MaxPackets", UintegerValue(4294967295U));
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client.SetAttribute("Interval", TimeValue(Seconds(packetInterval)));
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client.SetAttribute("PacketSize", UintegerValue(payloadSize));
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ApplicationContainer clientApp = client.Install(wifiApNode.Get(0));
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streamNumber += client.AssignStreams(wifiApNode.Get(0), streamNumber);
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clientApp.Start(Seconds(1));
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clientApp.Stop(simulationTime + Seconds(1));
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}
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else
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{
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// TCP flow
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uint16_t port = 50000;
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Address localAddress(InetSocketAddress(Ipv4Address::GetAny(), port));
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PacketSinkHelper packetSinkHelper("ns3::TcpSocketFactory", localAddress);
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serverApp = packetSinkHelper.Install(wifiStaNode.Get(0));
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streamNumber +=
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packetSinkHelper.AssignStreams(wifiStaNode.Get(0), streamNumber);
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serverApp.Start(Seconds(0));
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serverApp.Stop(simulationTime + Seconds(1));
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OnOffHelper onoff("ns3::TcpSocketFactory", Ipv4Address::GetAny());
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onoff.SetAttribute("OnTime",
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StringValue("ns3::ConstantRandomVariable[Constant=1]"));
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onoff.SetAttribute("OffTime",
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StringValue("ns3::ConstantRandomVariable[Constant=0]"));
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onoff.SetAttribute("PacketSize", UintegerValue(payloadSize));
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onoff.SetAttribute("DataRate", DataRateValue(maxLoad));
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AddressValue remoteAddress(
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InetSocketAddress(staNodeInterface.GetAddress(0), port));
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onoff.SetAttribute("Remote", remoteAddress);
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ApplicationContainer clientApp = onoff.Install(wifiApNode.Get(0));
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streamNumber += onoff.AssignStreams(wifiApNode.Get(0), streamNumber);
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clientApp.Start(Seconds(1));
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clientApp.Stop(simulationTime + Seconds(1));
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}
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Ipv4GlobalRoutingHelper::PopulateRoutingTables();
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Simulator::Stop(simulationTime + Seconds(1));
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Simulator::Run();
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auto rxBytes = 0.0;
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if (udp)
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{
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rxBytes = payloadSize * DynamicCast<UdpServer>(serverApp.Get(0))->GetReceived();
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}
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else
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{
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rxBytes = DynamicCast<PacketSink>(serverApp.Get(0))->GetTotalRx();
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}
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auto throughput = (rxBytes * 8) / simulationTime.GetMicroSeconds(); // Mbit/s
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Simulator::Destroy();
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std::cout << +mcs << "\t\t\t" << widthStr << " MHz\t\t"
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<< (widthStr.size() > 3 ? "" : "\t") << (sgi ? "400 ns" : "800 ns")
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<< "\t\t\t" << throughput << " Mbit/s" << std::endl;
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// test first element
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if (mcs == minMcs && width == 20 && !sgi)
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{
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if (throughput < minExpectedThroughput)
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{
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NS_LOG_ERROR("Obtained throughput " << throughput << " is not expected!");
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exit(1);
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}
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}
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// test last element
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if (mcs == maxMcs && width == 160 && sgi)
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{
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if (maxExpectedThroughput > 0 && throughput > maxExpectedThroughput)
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{
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NS_LOG_ERROR("Obtained throughput " << throughput << " is not expected!");
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exit(1);
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}
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}
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// test previous throughput is smaller (for the same mcs)
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if (throughput > previous)
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{
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previous = throughput;
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}
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else
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{
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NS_LOG_ERROR("Obtained throughput " << throughput << " is not expected!");
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exit(1);
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}
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// test previous throughput is smaller (for the same channel width and GI)
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if (throughput > prevThroughput[index])
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{
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prevThroughput[index] = throughput;
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}
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else
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{
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NS_LOG_ERROR("Obtained throughput " << throughput << " is not expected!");
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exit(1);
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}
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index++;
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}
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}
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}
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return 0;
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}
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