/* * Copyright (c) 2015 SEBASTIEN DERONNE * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation; * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Author: Sebastien Deronne */ #include "ns3/boolean.h" #include "ns3/command-line.h" #include "ns3/config.h" #include "ns3/double.h" #include "ns3/internet-stack-helper.h" #include "ns3/ipv4-address-helper.h" #include "ns3/ipv4-global-routing-helper.h" #include "ns3/log.h" #include "ns3/mobility-helper.h" #include "ns3/on-off-helper.h" #include "ns3/packet-sink-helper.h" #include "ns3/packet-sink.h" #include "ns3/ssid.h" #include "ns3/string.h" #include "ns3/udp-client-server-helper.h" #include "ns3/uinteger.h" #include "ns3/yans-wifi-channel.h" #include "ns3/yans-wifi-helper.h" // This is a simple example in order to show how to configure an IEEE 802.11ac Wi-Fi network. // // It outputs the UDP or TCP goodput for every VHT MCS value, which depends on the MCS value (0 to // 9, where 9 is forbidden when the channel width is 20 MHz), the channel width (20, 40, 80 or 160 // MHz) and the guard interval (long or short). The PHY bitrate is constant over all the simulation // run. The user can also specify the distance between the access point and the station: the larger // the distance the smaller the goodput. // // The simulation assumes a single station in an infrastructure network: // // STA AP // * * // | | // n1 n2 // // Packets in this simulation belong to BestEffort Access Class (AC_BE). using namespace ns3; NS_LOG_COMPONENT_DEFINE("vht-wifi-network"); int main(int argc, char* argv[]) { bool udp = true; bool useRts = false; double simulationTime = 10; // seconds double distance = 1.0; // meters int mcs = -1; // -1 indicates an unset value double minExpectedThroughput = 0; double maxExpectedThroughput = 0; CommandLine cmd(__FILE__); cmd.AddValue("distance", "Distance in meters between the station and the access point", distance); cmd.AddValue("simulationTime", "Simulation time in seconds", simulationTime); cmd.AddValue("udp", "UDP if set to 1, TCP otherwise", udp); cmd.AddValue("useRts", "Enable/disable RTS/CTS", useRts); cmd.AddValue("mcs", "if set, limit testing to a specific MCS (0-9)", mcs); cmd.AddValue("minExpectedThroughput", "if set, simulation fails if the lowest throughput is below this value", minExpectedThroughput); cmd.AddValue("maxExpectedThroughput", "if set, simulation fails if the highest throughput is above this value", maxExpectedThroughput); cmd.Parse(argc, argv); if (useRts) { Config::SetDefault("ns3::WifiRemoteStationManager::RtsCtsThreshold", StringValue("0")); } double prevThroughput[8]; for (uint32_t l = 0; l < 8; l++) { prevThroughput[l] = 0; } std::cout << "MCS value" << "\t\t" << "Channel width" << "\t\t" << "short GI" << "\t\t" << "Throughput" << '\n'; int minMcs = 0; int maxMcs = 9; if (mcs >= 0 && mcs <= 9) { minMcs = mcs; maxMcs = mcs; } for (int mcs = minMcs; mcs <= maxMcs; mcs++) { uint8_t index = 0; double previous = 0; for (int channelWidth = 20; channelWidth <= 160;) { if (mcs == 9 && channelWidth == 20) { channelWidth *= 2; continue; } for (int sgi = 0; sgi < 2; sgi++) { uint32_t payloadSize; // 1500 byte IP packet if (udp) { payloadSize = 1472; // bytes } else { payloadSize = 1448; // bytes Config::SetDefault("ns3::TcpSocket::SegmentSize", UintegerValue(payloadSize)); } NodeContainer wifiStaNode; wifiStaNode.Create(1); NodeContainer wifiApNode; wifiApNode.Create(1); YansWifiChannelHelper channel = YansWifiChannelHelper::Default(); YansWifiPhyHelper phy; phy.SetChannel(channel.Create()); phy.Set("ChannelSettings", StringValue("{0, " + std::to_string(channelWidth) + ", BAND_5GHZ, 0}")); WifiHelper wifi; wifi.SetStandard(WIFI_STANDARD_80211ac); WifiMacHelper mac; std::ostringstream oss; oss << "VhtMcs" << mcs; wifi.SetRemoteStationManager("ns3::ConstantRateWifiManager", "DataMode", StringValue(oss.str()), "ControlMode", StringValue(oss.str())); // Set guard interval wifi.ConfigHtOptions("ShortGuardIntervalSupported", BooleanValue(sgi)); Ssid ssid = Ssid("ns3-80211ac"); mac.SetType("ns3::StaWifiMac", "Ssid", SsidValue(ssid)); NetDeviceContainer staDevice; staDevice = wifi.Install(phy, mac, wifiStaNode); mac.SetType("ns3::ApWifiMac", "EnableBeaconJitter", BooleanValue(false), "Ssid", SsidValue(ssid)); NetDeviceContainer apDevice; apDevice = wifi.Install(phy, mac, wifiApNode); // mobility. MobilityHelper mobility; Ptr positionAlloc = CreateObject(); positionAlloc->Add(Vector(0.0, 0.0, 0.0)); positionAlloc->Add(Vector(distance, 0.0, 0.0)); mobility.SetPositionAllocator(positionAlloc); mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel"); mobility.Install(wifiApNode); mobility.Install(wifiStaNode); /* Internet stack*/ InternetStackHelper stack; stack.Install(wifiApNode); stack.Install(wifiStaNode); Ipv4AddressHelper address; address.SetBase("192.168.1.0", "255.255.255.0"); Ipv4InterfaceContainer staNodeInterface; Ipv4InterfaceContainer apNodeInterface; staNodeInterface = address.Assign(staDevice); apNodeInterface = address.Assign(apDevice); /* Setting applications */ ApplicationContainer serverApp; if (udp) { // UDP flow uint16_t port = 9; UdpServerHelper server(port); serverApp = server.Install(wifiStaNode.Get(0)); serverApp.Start(Seconds(0.0)); serverApp.Stop(Seconds(simulationTime + 1)); UdpClientHelper client(staNodeInterface.GetAddress(0), port); client.SetAttribute("MaxPackets", UintegerValue(4294967295U)); client.SetAttribute("Interval", TimeValue(Time("0.00002"))); // packets/s client.SetAttribute("PacketSize", UintegerValue(payloadSize)); ApplicationContainer clientApp = client.Install(wifiApNode.Get(0)); clientApp.Start(Seconds(1.0)); clientApp.Stop(Seconds(simulationTime + 1)); } else { // TCP flow uint16_t port = 50000; Address localAddress(InetSocketAddress(Ipv4Address::GetAny(), port)); PacketSinkHelper packetSinkHelper("ns3::TcpSocketFactory", localAddress); serverApp = packetSinkHelper.Install(wifiStaNode.Get(0)); serverApp.Start(Seconds(0.0)); serverApp.Stop(Seconds(simulationTime + 1)); OnOffHelper onoff("ns3::TcpSocketFactory", Ipv4Address::GetAny()); onoff.SetAttribute("OnTime", StringValue("ns3::ConstantRandomVariable[Constant=1]")); onoff.SetAttribute("OffTime", StringValue("ns3::ConstantRandomVariable[Constant=0]")); onoff.SetAttribute("PacketSize", UintegerValue(payloadSize)); onoff.SetAttribute("DataRate", DataRateValue(1000000000)); // bit/s AddressValue remoteAddress( InetSocketAddress(staNodeInterface.GetAddress(0), port)); onoff.SetAttribute("Remote", remoteAddress); ApplicationContainer clientApp = onoff.Install(wifiApNode.Get(0)); clientApp.Start(Seconds(1.0)); clientApp.Stop(Seconds(simulationTime + 1)); } Ipv4GlobalRoutingHelper::PopulateRoutingTables(); Simulator::Stop(Seconds(simulationTime + 1)); Simulator::Run(); uint64_t rxBytes = 0; if (udp) { rxBytes = payloadSize * DynamicCast(serverApp.Get(0))->GetReceived(); } else { rxBytes = DynamicCast(serverApp.Get(0))->GetTotalRx(); } double throughput = (rxBytes * 8) / (simulationTime * 1000000.0); // Mbit/s Simulator::Destroy(); std::cout << mcs << "\t\t\t" << channelWidth << " MHz\t\t\t" << sgi << "\t\t\t" << throughput << " Mbit/s" << std::endl; // test first element if (mcs == 0 && channelWidth == 20 && sgi == 0) { if (throughput < minExpectedThroughput) { NS_LOG_ERROR("Obtained throughput " << throughput << " is not expected!"); exit(1); } } // test last element if (mcs == 9 && channelWidth == 160 && sgi == 1) { if (maxExpectedThroughput > 0 && throughput > maxExpectedThroughput) { NS_LOG_ERROR("Obtained throughput " << throughput << " is not expected!"); exit(1); } } // test previous throughput is smaller (for the same mcs) if (throughput > previous) { previous = throughput; } else { NS_LOG_ERROR("Obtained throughput " << throughput << " is not expected!"); exit(1); } // test previous throughput is smaller (for the same channel width and GI) if (throughput > prevThroughput[index]) { prevThroughput[index] = throughput; } else { NS_LOG_ERROR("Obtained throughput " << throughput << " is not expected!"); exit(1); } index++; } channelWidth *= 2; } } return 0; }