412 lines
18 KiB
C++
412 lines
18 KiB
C++
/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
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/*
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* Copyright (c) 2016 SEBASTIEN DERONNE
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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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* Author: Sebastien Deronne <sebastien.deronne@gmail.com>
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*/
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#include "ns3/command-line.h"
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#include "ns3/config.h"
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#include "ns3/uinteger.h"
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#include "ns3/boolean.h"
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#include "ns3/double.h"
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#include "ns3/string.h"
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#include "ns3/enum.h"
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#include "ns3/log.h"
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#include "ns3/yans-wifi-helper.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/mobility-helper.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/udp-client-server-helper.h"
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#include "ns3/packet-sink-helper.h"
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#include "ns3/on-off-helper.h"
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#include "ns3/ipv4-global-routing-helper.h"
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#include "ns3/packet-sink.h"
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#include "ns3/yans-wifi-channel.h"
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#include "ns3/multi-model-spectrum-channel.h"
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#include "ns3/wifi-acknowledgment.h"
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#include "ns3/rng-seed-manager.h"
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// This is a simple example in order to show how to configure an IEEE 802.11ax Wi-Fi network.
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//
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// It outputs the UDP or TCP goodput for every HE MCS value, which depends on the MCS value (0 to 11),
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// the channel width (20, 40, 80 or 160 MHz) and the guard interval (800ns, 1600ns or 3200ns).
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// The PHY bitrate is constant over all the simulation run. The user can also specify the distance between
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// the access point and the station: the larger the distance the smaller the goodput.
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//
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// The simulation assumes a configurable number of stations 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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// By selecting an acknowledgment sequence for DL MU PPDUs, it is possible to aggregate a
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// Round Robin scheduler to the AP, so that DL MU PPDUs are sent by the AP via DL OFDMA.
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using namespace ns3;
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NS_LOG_COMPONENT_DEFINE ("he-wifi-network");
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int 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 useExtendedBlockAck {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}; //whether 2.4, 5 or 6 GHz
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std::size_t nStations {1};
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std::string dlAckSeqType {"NO-OFDMA"};
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bool enableUlOfdma {false};
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bool enableBsrp {false};
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int mcs {-1}; // -1 indicates an unset value
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uint32_t payloadSize = 700; // must fit in the max TX duration when transmitting at MCS 0 over an RU of 26 tones
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std::string phyModel {"Yans"};
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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", "Whether working in the 2.4, 5 or 6 GHz band (other values gets rejected)", frequency);
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cmd.AddValue ("distance", "Distance in meters between the station and the access point", 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 ("useExtendedBlockAck", "Enable/disable use of extended BACK", useExtendedBlockAck);
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cmd.AddValue ("nStations", "Number of non-AP HE stations", nStations);
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cmd.AddValue ("dlAckType", "Ack sequence type for DL OFDMA (NO-OFDMA, ACK-SU-FORMAT, MU-BAR, AGGR-MU-BAR)",
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dlAckSeqType);
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cmd.AddValue ("enableUlOfdma", "Enable UL OFDMA (useful if DL OFDMA is enabled and TCP is used)", enableUlOfdma);
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cmd.AddValue ("enableBsrp", "Enable BSRP (useful if DL and UL OFDMA are enabled and TCP is used)", enableBsrp);
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cmd.AddValue ("mcs", "if set, limit testing to a specific MCS (0-11)", mcs);
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cmd.AddValue ("payloadSize", "The application payload size in bytes", payloadSize);
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cmd.AddValue ("phyModel", "PHY model to use when OFDMA is disabled (Yans or Spectrum). If OFDMA is enabled then Spectrum is automatically selected", phyModel);
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cmd.AddValue ("minExpectedThroughput", "if set, simulation fails if the lowest throughput is below this value", minExpectedThroughput);
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cmd.AddValue ("maxExpectedThroughput", "if set, simulation fails if the highest throughput is above this value", 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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if (dlAckSeqType == "ACK-SU-FORMAT")
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{
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Config::SetDefault ("ns3::WifiDefaultAckManager::DlMuAckSequenceType",
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EnumValue (WifiAcknowledgment::DL_MU_BAR_BA_SEQUENCE));
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}
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else if (dlAckSeqType == "MU-BAR")
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{
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Config::SetDefault ("ns3::WifiDefaultAckManager::DlMuAckSequenceType",
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EnumValue (WifiAcknowledgment::DL_MU_TF_MU_BAR));
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}
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else if (dlAckSeqType == "AGGR-MU-BAR")
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{
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Config::SetDefault ("ns3::WifiDefaultAckManager::DlMuAckSequenceType",
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EnumValue (WifiAcknowledgment::DL_MU_AGGREGATE_TF));
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}
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else if (dlAckSeqType != "NO-OFDMA")
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{
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NS_ABORT_MSG ("Invalid DL ack sequence type (must be NO-OFDMA, ACK-SU-FORMAT, MU-BAR or AGGR-MU-BAR)");
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}
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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 (dlAckSeqType != "NO-OFDMA")
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{
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// SpectrumWifiPhy is required for OFDMA
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phyModel = "Spectrum";
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}
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double prevThroughput [12];
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for (uint32_t l = 0; l < 12; l++)
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{
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prevThroughput[l] = 0;
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}
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std::cout << "MCS value" << "\t\t" << "Channel width" << "\t\t" << "GI" << "\t\t\t" << "Throughput" << '\n';
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int minMcs = 0;
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int maxMcs = 11;
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if (mcs >= 0 && mcs <= 11)
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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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uint8_t maxChannelWidth = frequency == 2.4 ? 40 : 160;
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for (int channelWidth = 20; channelWidth <= maxChannelWidth; ) //MHz
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{
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for (int gi = 3200; gi >= 800; ) //Nanoseconds
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{
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if (!udp)
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{
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Config::SetDefault ("ns3::TcpSocket::SegmentSize", UintegerValue (payloadSize));
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}
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NodeContainer wifiStaNodes;
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wifiStaNodes.Create (nStations);
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NodeContainer wifiApNode;
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wifiApNode.Create (1);
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NetDeviceContainer apDevice, staDevices;
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WifiMacHelper mac;
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WifiHelper wifi;
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std::string channelStr ("{0, " + std::to_string (channelWidth) + ", ");
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if (frequency == 6)
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{
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wifi.SetStandard (WIFI_STANDARD_80211ax);
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channelStr += "BAND_6GHZ, 0}";
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Config::SetDefault ("ns3::LogDistancePropagationLossModel::ReferenceLoss", DoubleValue (48));
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}
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else if (frequency == 5)
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{
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wifi.SetStandard (WIFI_STANDARD_80211ax);
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channelStr += "BAND_5GHZ, 0}";
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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_80211ax);
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channelStr += "BAND_2_4GHZ, 0}";
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Config::SetDefault ("ns3::LogDistancePropagationLossModel::ReferenceLoss", DoubleValue (40));
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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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std::ostringstream oss;
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oss << "HeMcs" << mcs;
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wifi.SetRemoteStationManager ("ns3::ConstantRateWifiManager","DataMode", StringValue (oss.str ()),
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"ControlMode", StringValue (oss.str ()));
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Ssid ssid = Ssid ("ns3-80211ax");
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if (phyModel == "Spectrum")
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{
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/*
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* SingleModelSpectrumChannel cannot be used with 802.11ax because two
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* spectrum models are required: one with 78.125 kHz bands for HE PPDUs
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* and one with 312.5 kHz bands for, e.g., non-HT PPDUs (for more details,
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* see issue #408 (CLOSED))
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*/
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Ptr<MultiModelSpectrumChannel> spectrumChannel = CreateObject<MultiModelSpectrumChannel> ();
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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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mac.SetType ("ns3::StaWifiMac",
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"Ssid", SsidValue (ssid));
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phy.Set ("ChannelSettings", StringValue (channelStr));
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staDevices = wifi.Install (phy, mac, wifiStaNodes);
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if (dlAckSeqType != "NO-OFDMA")
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{
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mac.SetMultiUserScheduler ("ns3::RrMultiUserScheduler",
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"EnableUlOfdma", BooleanValue (enableUlOfdma),
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"EnableBsrp", BooleanValue (enableBsrp));
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}
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mac.SetType ("ns3::ApWifiMac",
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"EnableBeaconJitter", BooleanValue (false),
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"Ssid", 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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YansWifiChannelHelper 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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mac.SetType ("ns3::StaWifiMac",
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"Ssid", SsidValue (ssid));
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phy.Set ("ChannelSettings", StringValue (channelStr));
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staDevices = wifi.Install (phy, mac, wifiStaNodes);
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mac.SetType ("ns3::ApWifiMac",
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"EnableBeaconJitter", BooleanValue (false),
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"Ssid", SsidValue (ssid));
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apDevice = wifi.Install (phy, mac, wifiApNode);
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}
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RngSeedManager::SetSeed (1);
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RngSeedManager::SetRun (1);
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int64_t streamNumber = 100;
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streamNumber += wifi.AssignStreams (apDevice, streamNumber);
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streamNumber += wifi.AssignStreams (staDevices, streamNumber);
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// Set guard interval and MPDU buffer size
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Config::Set ("/NodeList/*/DeviceList/*/$ns3::WifiNetDevice/HeConfiguration/GuardInterval", TimeValue (NanoSeconds (gi)));
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Config::Set ("/NodeList/*/DeviceList/*/$ns3::WifiNetDevice/HeConfiguration/MpduBufferSize", UintegerValue (useExtendedBlockAck ? 256 : 64));
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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 (wifiStaNodes);
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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 (wifiStaNodes);
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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 staNodeInterfaces;
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Ipv4InterfaceContainer apNodeInterface;
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staNodeInterfaces = address.Assign (staDevices);
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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 (wifiStaNodes);
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serverApp.Start (Seconds (0.0));
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serverApp.Stop (Seconds (simulationTime + 1));
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for (std::size_t i = 0; i < nStations; i++)
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{
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UdpClientHelper client (staNodeInterfaces.GetAddress (i), 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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}
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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 (wifiStaNodes);
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serverApp.Start (Seconds (0.0));
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serverApp.Stop (Seconds (simulationTime + 1));
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for (std::size_t i = 0; i < nStations; i++)
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{
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OnOffHelper onoff ("ns3::TcpSocketFactory", Ipv4Address::GetAny ());
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onoff.SetAttribute ("OnTime", StringValue ("ns3::ConstantRandomVariable[Constant=1]"));
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onoff.SetAttribute ("OffTime", StringValue ("ns3::ConstantRandomVariable[Constant=0]"));
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onoff.SetAttribute ("PacketSize", UintegerValue (payloadSize));
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onoff.SetAttribute ("DataRate", DataRateValue (1000000000)); //bit/s
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AddressValue remoteAddress (InetSocketAddress (staNodeInterfaces.GetAddress (i), 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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}
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Simulator::Schedule (Seconds (0), &Ipv4GlobalRoutingHelper::PopulateRoutingTables);
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Simulator::Stop (Seconds (simulationTime + 1));
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Simulator::Run ();
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// When multiple stations are used, there are chances that association requests collide
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// and hence the throughput may be lower than expected. Therefore, we relax the check
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// that the throughput cannot decrease by introducing a scaling factor (or tolerance)
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double tolerance = 0.10;
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uint64_t rxBytes = 0;
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if (udp)
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{
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for (uint32_t i = 0; i < serverApp.GetN (); i++)
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{
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rxBytes += payloadSize * DynamicCast<UdpServer> (serverApp.Get (i))->GetReceived ();
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}
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}
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else
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{
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for (uint32_t i = 0; i < serverApp.GetN (); i++)
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{
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rxBytes += DynamicCast<PacketSink> (serverApp.Get (i))->GetTotalRx ();
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}
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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" << gi << " ns\t\t\t" << throughput << " Mbit/s" << std::endl;
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//test first element
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if (mcs == 0 && channelWidth == 20 && gi == 3200)
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{
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if (throughput * (1 + tolerance) < 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 == 11 && channelWidth == 160 && gi == 800)
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{
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if (maxExpectedThroughput > 0 && throughput > maxExpectedThroughput * (1 + tolerance))
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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 * (1 + tolerance) > previous)
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{
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previous = throughput;
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}
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else if (throughput > 0)
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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 * (1 + tolerance) > prevThroughput [index])
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{
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prevThroughput [index] = throughput;
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}
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else if (throughput > 0)
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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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gi /= 2;
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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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