633 lines
28 KiB
C++
633 lines
28 KiB
C++
/*
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* Copyright (c) 2022
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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/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/eht-phy.h"
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#include "ns3/enum.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/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/wifi-acknowledgment.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 <array>
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#include <functional>
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#include <numeric>
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// This is a simple example in order to show how to configure an IEEE 802.11be Wi-Fi network.
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//
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// It outputs the UDP or TCP goodput for every EHT MCS value, which depends on the MCS value (0 to
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// 13), 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
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// between 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("eht-wifi-network");
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/**
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* \param udp true if UDP is used, false if TCP is used
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* \param serverApp a container of server applications
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* \param payloadSize the size in bytes of the packets
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* \return the bytes received by each server application
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*/
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std::vector<uint64_t>
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GetRxBytes(bool udp, const ApplicationContainer& serverApp, uint32_t payloadSize)
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{
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std::vector<uint64_t> rxBytes(serverApp.GetN(), 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[i] = 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[i] = DynamicCast<PacketSink>(serverApp.Get(i))->GetTotalRx();
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}
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}
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return rxBytes;
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}
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/**
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* Print average throughput over an intermediate time interval.
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* \param rxBytes a vector of the amount of bytes received by each server application
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* \param udp true if UDP is used, false if TCP is used
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* \param serverApp a container of server applications
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* \param payloadSize the size in bytes of the packets
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* \param tputInterval the duration of an intermediate time interval
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* \param simulationTime the simulation time in seconds
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*/
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void
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PrintIntermediateTput(std::vector<uint64_t>& rxBytes,
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bool udp,
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const ApplicationContainer& serverApp,
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uint32_t payloadSize,
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Time tputInterval,
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double simulationTime)
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{
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auto newRxBytes = GetRxBytes(udp, serverApp, payloadSize);
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Time now = Simulator::Now();
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std::cout << "[" << (now - tputInterval).As(Time::S) << " - " << now.As(Time::S)
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<< "] Per-STA Throughput (Mbit/s):";
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for (std::size_t i = 0; i < newRxBytes.size(); i++)
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{
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std::cout << "\t\t(" << i << ") "
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<< (newRxBytes[i] - rxBytes[i]) * 8. / tputInterval.GetMicroSeconds(); // Mbit/s
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}
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std::cout << std::endl;
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rxBytes.swap(newRxBytes);
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if (now < Seconds(simulationTime) - NanoSeconds(1))
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{
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Simulator::Schedule(Min(tputInterval, Seconds(simulationTime) - now - NanoSeconds(1)),
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&PrintIntermediateTput,
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rxBytes,
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udp,
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serverApp,
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payloadSize,
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tputInterval,
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simulationTime);
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}
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}
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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 downlink{true};
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bool useRts{false};
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uint16_t mpduBufferSize{512};
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std::string emlsrLinks;
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uint16_t paddingDelayUsec{32};
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uint16_t transitionDelayUsec{128};
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uint16_t channelSwitchDelayUsec{100};
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bool switchAuxPhy{true};
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uint16_t auxPhyChWidth{20};
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bool auxPhyTxCapable{true};
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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 the first link operates in the 2.4, 5 or 6 GHz
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double frequency2{0}; // whether the second link operates in the 2.4, 5 or 6 GHz (0 means no
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// second link exists)
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double frequency3{
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0}; // whether the third link operates in the 2.4, 5 or 6 GHz (0 means no third link exists)
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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 =
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700; // must fit in the max TX duration when transmitting at MCS 0 over an RU of 26 tones
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Time tputInterval{0}; // interval for detailed throughput measurement
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double minExpectedThroughput{0};
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double maxExpectedThroughput{0};
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Time accessReqInterval{0};
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CommandLine cmd(__FILE__);
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cmd.AddValue(
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"frequency",
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"Whether the first link operates in the 2.4, 5 or 6 GHz band (other values gets rejected)",
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frequency);
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cmd.AddValue(
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"frequency2",
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"Whether the second link operates in the 2.4, 5 or 6 GHz band (0 means the device has one "
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"link, otherwise the band must be different than first link and third link)",
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frequency2);
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cmd.AddValue(
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"frequency3",
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"Whether the third link operates in the 2.4, 5 or 6 GHz band (0 means the device has up to "
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"two links, otherwise the band must be different than first link and second link)",
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frequency3);
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cmd.AddValue("emlsrLinks",
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"The comma separated list of IDs of EMLSR links (for MLDs only)",
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emlsrLinks);
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cmd.AddValue("emlsrPaddingDelay",
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"The EMLSR padding delay in microseconds (0, 32, 64, 128 or 256)",
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paddingDelayUsec);
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cmd.AddValue("emlsrTransitionDelay",
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"The EMLSR transition delay in microseconds (0, 16, 32, 64, 128 or 256)",
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transitionDelayUsec);
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cmd.AddValue("emlsrAuxSwitch",
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"Whether Aux PHY should switch channel to operate on the link on which "
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"the Main PHY was operating before moving to the link of the Aux PHY. ",
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switchAuxPhy);
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cmd.AddValue("emlsrAuxChWidth",
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"The maximum channel width (MHz) supported by Aux PHYs.",
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auxPhyChWidth);
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cmd.AddValue("emlsrAuxTxCapable",
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"Whether Aux PHYs are capable of transmitting.",
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auxPhyTxCapable);
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cmd.AddValue("channelSwitchDelay",
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"The PHY channel switch delay in microseconds",
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channelSwitchDelayUsec);
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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("downlink",
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"Generate downlink flows if set to 1, uplink flows otherwise",
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downlink);
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cmd.AddValue("useRts", "Enable/disable RTS/CTS", useRts);
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cmd.AddValue("mpduBufferSize",
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"Size (in number of MPDUs) of the BlockAck buffer",
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mpduBufferSize);
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cmd.AddValue("nStations", "Number of non-AP EHT stations", nStations);
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cmd.AddValue("dlAckType",
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"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",
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"Enable UL OFDMA (useful if DL OFDMA is enabled and TCP is used)",
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enableUlOfdma);
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cmd.AddValue("enableBsrp",
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"Enable BSRP (useful if DL and UL OFDMA are enabled and TCP is used)",
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enableBsrp);
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cmd.AddValue(
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"muSchedAccessReqInterval",
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"Duration of the interval between two requests for channel access made by the MU scheduler",
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accessReqInterval);
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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("tputInterval", "duration of intervals for throughput measurement", tputInterval);
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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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Config::SetDefault("ns3::WifiDefaultProtectionManager::EnableMuRts", BooleanValue(true));
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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 "
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"AGGR-MU-BAR)");
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}
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double prevThroughput[12] = {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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<< "GI"
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<< "\t\t\t"
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<< "Throughput" << '\n';
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int minMcs = 0;
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int maxMcs = 13;
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if (mcs >= 0 && mcs <= 13)
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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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uint16_t maxChannelWidth =
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(frequency != 2.4 && frequency2 != 2.4 && frequency3 != 2.4) ? 160 : 40;
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int minGi = enableUlOfdma ? 1600 : 800;
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for (int channelWidth = 20; channelWidth <= maxChannelWidth;) // MHz
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{
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for (int gi = 3200; gi >= minGi;) // 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;
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NetDeviceContainer staDevices;
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WifiMacHelper mac;
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WifiHelper wifi;
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wifi.SetStandard(WIFI_STANDARD_80211be);
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std::array<std::string, 3> channelStr;
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std::array<FrequencyRange, 3> freqRanges;
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uint8_t nLinks = 0;
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std::string dataModeStr = "EhtMcs" + std::to_string(mcs);
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std::string ctrlRateStr;
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uint64_t nonHtRefRateMbps = EhtPhy::GetNonHtReferenceRate(mcs) / 1e6;
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if (frequency2 == frequency || frequency3 == frequency ||
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(frequency3 != 0 && frequency3 == frequency2))
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{
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NS_FATAL_ERROR("Frequency values must be unique!");
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}
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for (auto freq : {frequency, frequency2, frequency3})
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{
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if (nLinks > 0 && freq == 0)
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{
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break;
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}
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channelStr[nLinks] = "{0, " + std::to_string(channelWidth) + ", ";
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if (freq == 6)
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{
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channelStr[nLinks] += "BAND_6GHZ, 0}";
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freqRanges[nLinks] = WIFI_SPECTRUM_6_GHZ;
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Config::SetDefault("ns3::LogDistancePropagationLossModel::ReferenceLoss",
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DoubleValue(48));
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wifi.SetRemoteStationManager(nLinks,
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"ns3::ConstantRateWifiManager",
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"DataMode",
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StringValue(dataModeStr),
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"ControlMode",
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StringValue(dataModeStr));
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}
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else if (freq == 5)
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{
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channelStr[nLinks] += "BAND_5GHZ, 0}";
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freqRanges[nLinks] = WIFI_SPECTRUM_5_GHZ;
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ctrlRateStr = "OfdmRate" + std::to_string(nonHtRefRateMbps) + "Mbps";
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wifi.SetRemoteStationManager(nLinks,
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"ns3::ConstantRateWifiManager",
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"DataMode",
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StringValue(dataModeStr),
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"ControlMode",
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StringValue(ctrlRateStr));
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}
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else if (freq == 2.4)
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{
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channelStr[nLinks] += "BAND_2_4GHZ, 0}";
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freqRanges[nLinks] = WIFI_SPECTRUM_2_4_GHZ;
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Config::SetDefault("ns3::LogDistancePropagationLossModel::ReferenceLoss",
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DoubleValue(40));
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ctrlRateStr = "ErpOfdmRate" + std::to_string(nonHtRefRateMbps) + "Mbps";
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wifi.SetRemoteStationManager(nLinks,
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"ns3::ConstantRateWifiManager",
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"DataMode",
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StringValue(dataModeStr),
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"ControlMode",
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StringValue(ctrlRateStr));
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}
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else
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{
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NS_FATAL_ERROR("Wrong frequency value!");
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}
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nLinks++;
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}
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if (nLinks > 1 && !emlsrLinks.empty())
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{
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wifi.ConfigEhtOptions("EmlsrActivated", BooleanValue(true));
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}
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Ssid ssid = Ssid("ns3-80211be");
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/*
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* SingleModelSpectrumChannel cannot be used with 802.11be 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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SpectrumWifiPhyHelper phy(nLinks);
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phy.SetPcapDataLinkType(WifiPhyHelper::DLT_IEEE802_11_RADIO);
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phy.Set("ChannelSwitchDelay", TimeValue(MicroSeconds(channelSwitchDelayUsec)));
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mac.SetType("ns3::StaWifiMac", "Ssid", SsidValue(ssid));
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mac.SetEmlsrManager("ns3::DefaultEmlsrManager",
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"EmlsrLinkSet",
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StringValue(emlsrLinks),
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"EmlsrPaddingDelay",
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TimeValue(MicroSeconds(paddingDelayUsec)),
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"EmlsrTransitionDelay",
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TimeValue(MicroSeconds(transitionDelayUsec)),
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"SwitchAuxPhy",
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BooleanValue(switchAuxPhy),
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"AuxPhyTxCapable",
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BooleanValue(auxPhyTxCapable),
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"AuxPhyChannelWidth",
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UintegerValue(auxPhyChWidth));
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for (uint8_t linkId = 0; linkId < nLinks; linkId++)
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{
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phy.Set(linkId, "ChannelSettings", StringValue(channelStr[linkId]));
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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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phy.AddChannel(spectrumChannel, freqRanges[linkId]);
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}
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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",
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BooleanValue(enableUlOfdma),
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"EnableBsrp",
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BooleanValue(enableBsrp),
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"AccessReqInterval",
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TimeValue(accessReqInterval));
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}
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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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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(
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"/NodeList/*/DeviceList/*/$ns3::WifiNetDevice/HeConfiguration/GuardInterval",
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TimeValue(NanoSeconds(gi)));
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Config::Set("/NodeList/*/DeviceList/*/$ns3::WifiNetDevice/Mac/MpduBufferSize",
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UintegerValue(mpduBufferSize));
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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);
|
|
|
|
/* Internet stack*/
|
|
InternetStackHelper stack;
|
|
stack.Install(wifiApNode);
|
|
stack.Install(wifiStaNodes);
|
|
streamNumber += stack.AssignStreams(wifiApNode, streamNumber);
|
|
streamNumber += stack.AssignStreams(wifiStaNodes, streamNumber);
|
|
|
|
Ipv4AddressHelper address;
|
|
address.SetBase("192.168.1.0", "255.255.255.0");
|
|
Ipv4InterfaceContainer staNodeInterfaces;
|
|
Ipv4InterfaceContainer apNodeInterface;
|
|
|
|
staNodeInterfaces = address.Assign(staDevices);
|
|
apNodeInterface = address.Assign(apDevice);
|
|
|
|
/* Setting applications */
|
|
ApplicationContainer serverApp;
|
|
auto serverNodes = downlink ? std::ref(wifiStaNodes) : std::ref(wifiApNode);
|
|
Ipv4InterfaceContainer serverInterfaces;
|
|
NodeContainer clientNodes;
|
|
for (std::size_t i = 0; i < nStations; i++)
|
|
{
|
|
serverInterfaces.Add(downlink ? staNodeInterfaces.Get(i)
|
|
: apNodeInterface.Get(0));
|
|
clientNodes.Add(downlink ? wifiApNode.Get(0) : wifiStaNodes.Get(i));
|
|
}
|
|
|
|
const auto maxLoad =
|
|
nLinks * EhtPhy::GetDataRate(mcs, channelWidth, gi, 1) / nStations;
|
|
if (udp)
|
|
{
|
|
// UDP flow
|
|
uint16_t port = 9;
|
|
UdpServerHelper server(port);
|
|
serverApp = server.Install(serverNodes.get());
|
|
streamNumber += server.AssignStreams(serverNodes.get(), streamNumber);
|
|
|
|
serverApp.Start(Seconds(0.0));
|
|
serverApp.Stop(Seconds(simulationTime + 1));
|
|
const auto packetInterval = payloadSize * 8.0 / maxLoad;
|
|
|
|
for (std::size_t i = 0; i < nStations; i++)
|
|
{
|
|
UdpClientHelper client(serverInterfaces.GetAddress(i), port);
|
|
client.SetAttribute("MaxPackets", UintegerValue(4294967295U));
|
|
client.SetAttribute("Interval", TimeValue(Seconds(packetInterval)));
|
|
client.SetAttribute("PacketSize", UintegerValue(payloadSize));
|
|
ApplicationContainer clientApp = client.Install(clientNodes.Get(i));
|
|
streamNumber += client.AssignStreams(clientNodes.Get(i), streamNumber);
|
|
|
|
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(serverNodes.get());
|
|
streamNumber += packetSinkHelper.AssignStreams(serverNodes.get(), streamNumber);
|
|
|
|
serverApp.Start(Seconds(0.0));
|
|
serverApp.Stop(Seconds(simulationTime + 1));
|
|
|
|
for (std::size_t i = 0; i < nStations; i++)
|
|
{
|
|
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(maxLoad));
|
|
AddressValue remoteAddress(
|
|
InetSocketAddress(serverInterfaces.GetAddress(i), port));
|
|
onoff.SetAttribute("Remote", remoteAddress);
|
|
ApplicationContainer clientApp = onoff.Install(clientNodes.Get(i));
|
|
streamNumber += onoff.AssignStreams(clientNodes.Get(i), streamNumber);
|
|
|
|
clientApp.Start(Seconds(1.0));
|
|
clientApp.Stop(Seconds(simulationTime + 1));
|
|
}
|
|
}
|
|
|
|
// cumulative number of bytes received by each server application
|
|
std::vector<uint64_t> cumulRxBytes(nStations, 0);
|
|
|
|
if (tputInterval.IsStrictlyPositive())
|
|
{
|
|
Simulator::Schedule(Seconds(1) + tputInterval,
|
|
&PrintIntermediateTput,
|
|
cumulRxBytes,
|
|
udp,
|
|
serverApp,
|
|
payloadSize,
|
|
tputInterval,
|
|
simulationTime + 1);
|
|
}
|
|
|
|
Simulator::Stop(Seconds(simulationTime + 1));
|
|
Simulator::Run();
|
|
|
|
// When multiple stations are used, there are chances that association requests
|
|
// collide and hence the throughput may be lower than expected. Therefore, we relax
|
|
// the check that the throughput cannot decrease by introducing a scaling factor (or
|
|
// tolerance)
|
|
double tolerance = 0.10;
|
|
cumulRxBytes = GetRxBytes(udp, serverApp, payloadSize);
|
|
uint64_t rxBytes = std::accumulate(cumulRxBytes.cbegin(), cumulRxBytes.cend(), 0);
|
|
double throughput = (rxBytes * 8) / (simulationTime * 1000000.0); // Mbit/s
|
|
|
|
Simulator::Destroy();
|
|
|
|
std::cout << mcs << "\t\t\t" << channelWidth << " MHz\t\t\t" << gi << " ns\t\t\t"
|
|
<< throughput << " Mbit/s" << std::endl;
|
|
|
|
// test first element
|
|
if (mcs == minMcs && channelWidth == 20 && gi == 3200)
|
|
{
|
|
if (throughput * (1 + tolerance) < minExpectedThroughput)
|
|
{
|
|
NS_LOG_ERROR("Obtained throughput " << throughput << " is not expected!");
|
|
exit(1);
|
|
}
|
|
}
|
|
// test last element
|
|
if (mcs == maxMcs && channelWidth == maxChannelWidth && gi == 800)
|
|
{
|
|
if (maxExpectedThroughput > 0 &&
|
|
throughput > maxExpectedThroughput * (1 + tolerance))
|
|
{
|
|
NS_LOG_ERROR("Obtained throughput " << throughput << " is not expected!");
|
|
exit(1);
|
|
}
|
|
}
|
|
// test previous throughput is smaller (for the same mcs)
|
|
if (throughput * (1 + tolerance) > previous)
|
|
{
|
|
previous = throughput;
|
|
}
|
|
else if (throughput > 0)
|
|
{
|
|
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 * (1 + tolerance) > prevThroughput[index])
|
|
{
|
|
prevThroughput[index] = throughput;
|
|
}
|
|
else if (throughput > 0)
|
|
{
|
|
NS_LOG_ERROR("Obtained throughput " << throughput << " is not expected!");
|
|
exit(1);
|
|
}
|
|
index++;
|
|
gi /= 2;
|
|
}
|
|
channelWidth *= 2;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|