332 lines
13 KiB
C++
332 lines
13 KiB
C++
/*
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* Copyright (c) 2009 MIRKO BANCHI
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Authors: Mirko Banchi <mk.banchi@gmail.com>
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* Sebastien Deronne <sebastien.deronne@gmail.com>
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*/
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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/enum.h"
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#include "ns3/ht-phy.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/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/ssid.h"
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#include "ns3/string.h"
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#include "ns3/tuple.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/yans-wifi-channel.h"
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#include "ns3/yans-wifi-helper.h"
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// This is a simple example in order to show how to configure an IEEE 802.11n Wi-Fi network.
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//
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// It outputs the UDP or TCP goodput for every HT MCS value, which depends on the MCS value (0 to
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// 7), the channel width (20 or 40 MHz) and the guard interval (long or short). The PHY bitrate is
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// constant over all the simulation run. The user can also specify the distance between the access
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// point and the station: the larger 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("ht-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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double simulationTime = 10; // seconds
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double distance = 1.0; // meters
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double frequency = 5.0; // whether 2.4 or 5.0 GHz
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int mcs = -1; // -1 indicates an unset value
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double minExpectedThroughput = 0;
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double maxExpectedThroughput = 0;
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CommandLine cmd(__FILE__);
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cmd.AddValue("frequency",
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"Whether working in the 2.4 or 5.0 GHz band (other values gets rejected)",
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frequency);
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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 in seconds", 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("mcs", "if set, limit testing to a specific MCS (0-7)", mcs);
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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 (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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int minMcs = 0;
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int maxMcs = 7;
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if (mcs >= 0 && mcs <= 7)
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{
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minMcs = mcs;
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maxMcs = mcs;
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}
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for (int mcs = minMcs; mcs <= maxMcs; mcs++)
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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 channelWidth = 20; channelWidth <= 40;)
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{
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for (auto sgi : {false, true})
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{
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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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YansWifiChannelHelper channel = YansWifiChannelHelper::Default();
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YansWifiPhyHelper phy;
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phy.SetChannel(channel.Create());
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WifiMacHelper mac;
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WifiHelper wifi;
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std::ostringstream ossControlMode;
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if (frequency == 5.0)
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{
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ossControlMode << "OfdmRate";
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wifi.SetStandard(WIFI_STANDARD_80211n);
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}
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else if (frequency == 2.4)
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{
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wifi.SetStandard(WIFI_STANDARD_80211n);
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ossControlMode << "ErpOfdmRate";
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Config::SetDefault("ns3::LogDistancePropagationLossModel::ReferenceLoss",
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DoubleValue(40.046));
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}
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else
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{
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std::cout << "Wrong frequency value!" << std::endl;
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return 0;
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}
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auto nonHtRefRateMbps = HtPhy::GetNonHtReferenceRate(mcs) / 1e6;
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ossControlMode << nonHtRefRateMbps << "Mbps";
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std::ostringstream ossDataMode;
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ossDataMode << "HtMcs" << mcs;
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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("ns3-80211n");
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TupleValue<UintegerValue, UintegerValue, EnumValue<WifiPhyBand>, UintegerValue>
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channelValue;
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WifiPhyBand band = (frequency == 5.0 ? WIFI_PHY_BAND_5GHZ : WIFI_PHY_BAND_2_4GHZ);
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channelValue.Set(WifiPhy::ChannelTuple{0, channelWidth, band, 0});
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mac.SetType("ns3::StaWifiMac", "Ssid", SsidValue(ssid));
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phy.Set("ChannelSettings", channelValue);
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NetDeviceContainer staDevice;
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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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NetDeviceContainer apDevice;
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apDevice = wifi.Install(phy, mac, wifiApNode);
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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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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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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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serverApp.Start(Seconds(0.0));
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serverApp.Stop(Seconds(simulationTime + 1));
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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(Time("0.00001"))); // packets/s
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client.SetAttribute("PacketSize", UintegerValue(payloadSize));
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ApplicationContainer clientApp = client.Install(wifiApNode.Get(0));
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clientApp.Start(Seconds(1.0));
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clientApp.Stop(Seconds(simulationTime + 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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serverApp.Start(Seconds(0.0));
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serverApp.Stop(Seconds(simulationTime + 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(200000000)); // bit/s
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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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clientApp.Start(Seconds(1.0));
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clientApp.Stop(Seconds(simulationTime + 1));
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}
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Ipv4GlobalRoutingHelper::PopulateRoutingTables();
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Simulator::Stop(Seconds(simulationTime + 1));
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Simulator::Run();
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uint64_t rxBytes = 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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double throughput = (rxBytes * 8) / (simulationTime * 1000000.0); // Mbit/s
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Simulator::Destroy();
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std::cout << mcs << "\t\t\t" << channelWidth << " MHz\t\t\t" << std::boolalpha
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<< sgi << "\t\t\t" << throughput << " Mbit/s" << std::endl;
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// test first element
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if (mcs == 0 && channelWidth == 20 && !sgi)
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{
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if (throughput < minExpectedThroughput)
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{
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NS_FATAL_ERROR("Obtained throughput " << throughput << " is not expected!");
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}
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}
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// test last element
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if (mcs == 7 && channelWidth == 40 && sgi)
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{
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if (maxExpectedThroughput > 0 && throughput > maxExpectedThroughput)
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{
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NS_FATAL_ERROR("Obtained throughput " << throughput << " is not expected!");
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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_FATAL_ERROR("Obtained throughput " << throughput << " is not expected!");
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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_FATAL_ERROR("Obtained throughput " << throughput << " is not expected!");
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}
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index++;
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}
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channelWidth *= 2;
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}
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}
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return 0;
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}
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