336 lines
14 KiB
C++
336 lines
14 KiB
C++
/*
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* Copyright (c) 2019 University of Washington
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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: Sébastien Deronne <sebastien.deronne@gmail.com>
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*/
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//
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// This example program can be used to experiment with spatial
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// reuse mechanisms of 802.11ax.
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//
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// The geometry is as follows:
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//
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// STA1 STA1
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// | |
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// d1 | |d2
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// | d3 |
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// AP1 -----------AP2
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//
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// STA1 and AP1 are in one BSS (with color set to 1), while STA2 and AP2 are in
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// another BSS (with color set to 2). The distances are configurable (d1 through d3).
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//
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// STA1 is continuously transmitting data to AP1, while STA2 is continuously sending data to AP2.
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// Each STA has configurable traffic loads (inter packet interval and packet size).
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// It is also possible to configure TX power per node as well as their CCA-ED tresholds.
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// OBSS_PD spatial reuse feature can be enabled (default) or disabled, and the OBSS_PD
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// threshold can be set as well (default: -72 dBm).
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// A simple Friis path loss model is used and a constant PHY rate is considered.
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//
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// In general, the program can be configured at run-time by passing command-line arguments.
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// The following command will display all of the available run-time help options:
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// ./ns3 run "wifi-spatial-reuse --help"
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//
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// According to the Wi-Fi models of ns-3.36 release, throughput with
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// OBSS PD enabled (--enableObssPd=True) was roughly 6.5 Mbps, and with
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// it disabled (--enableObssPd=False) was roughly 3.5 Mbps.
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//
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// This difference between those results is because OBSS_PD spatial
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// reuse enables to ignore transmissions from another BSS when the
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// received power is below the configured threshold, and therefore
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// either defer during ongoing transmission or transmit at the same
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// time.
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//
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// Note that, by default, this script configures a network using a
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// channel bandwidth of 20 MHz. Changing this value alone (through
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// the --channelWidth argument) without properly adjusting other
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// parameters will void the effect of spatial reuse: since energy is
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// measured over the 20 MHz primary channel regardless of the channel
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// width, doubling the transmission bandwidth creates a 3 dB drop in
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// the measured energy level (i.e., a halving of the measured
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// energy). Because of this, when using the channelWidth argument
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// users should also adjust the CCA-ED Thresholds (via --ccaEdTrSta1,
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// --ccaEdTrSta2, --ccaEdTrAp1, and --ccaEdTrAp2), the Minimum RSSI
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// for preamble detection (via --minimumRssi), and the OBSS PD
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// Threshold (via --obssPdThreshold) appropriately. For instance,
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// this can be accomplished for a channel width of 40 MHz by lowering
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// all these values by 3 dB compared to their defaults.
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//
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// In addition, consider that adapting the adjustments shown above
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// for an 80 MHz bandwidth (using a 6 dB threshold adjustment instead
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// of 3 dB) will not produce any changes when enableObssPd is enabled
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// or disabled. The cause for this is the insufficient amount of
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// traffic that is generated by default in the example: increasing
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// the bandwidth shortens the frame durations, and lowers the
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// collision probability. Collisions between BSSs are a necessary
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// condition to see the improvements brought by spatial reuse, and
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// thus increasing the amount of generated traffic by setting the
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// interval argument to a lower value is necessary to see the
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// benefits of spatial reuse in this scenario. This can, for
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// instance, be accomplished by setting --interval=0.0001.
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//
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#include "ns3/abort.h"
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#include "ns3/ap-wifi-mac.h"
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#include "ns3/application-container.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/he-configuration.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/packet-socket-client.h"
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#include "ns3/packet-socket-helper.h"
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#include "ns3/packet-socket-server.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/wifi-net-device.h"
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using namespace ns3;
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std::vector<uint32_t> bytesReceived(4);
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uint32_t
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ContextToNodeId(std::string context)
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{
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std::string sub = context.substr(10);
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uint32_t pos = sub.find("/Device");
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return std::stoi(sub.substr(0, pos));
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}
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void
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SocketRx(std::string context, Ptr<const Packet> p, const Address& addr)
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{
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uint32_t nodeId = ContextToNodeId(context);
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bytesReceived[nodeId] += p->GetSize();
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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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double duration = 10.0; // seconds
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double d1 = 30.0; // meters
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double d2 = 30.0; // meters
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double d3 = 150.0; // meters
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double powSta1 = 10.0; // dBm
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double powSta2 = 10.0; // dBm
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double powAp1 = 21.0; // dBm
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double powAp2 = 21.0; // dBm
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double ccaEdTrSta1 = -62; // dBm
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double ccaEdTrSta2 = -62; // dBm
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double ccaEdTrAp1 = -62; // dBm
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double ccaEdTrAp2 = -62; // dBm
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double minimumRssi = -82; // dBm
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int channelBandwidth = 20; // MHz
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uint32_t payloadSize = 1500; // bytes
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uint32_t mcs = 0; // MCS value
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double interval = 0.001; // seconds
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bool enableObssPd = true;
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double obssPdThreshold = -72.0; // dBm
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CommandLine cmd(__FILE__);
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cmd.AddValue("duration", "Duration of simulation (s)", duration);
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cmd.AddValue("interval", "Inter packet interval (s)", interval);
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cmd.AddValue("enableObssPd", "Enable/disable OBSS_PD", enableObssPd);
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cmd.AddValue("d1", "Distance between STA1 and AP1 (m)", d1);
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cmd.AddValue("d2", "Distance between STA2 and AP2 (m)", d2);
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cmd.AddValue("d3", "Distance between AP1 and AP2 (m)", d3);
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cmd.AddValue("powSta1", "Power of STA1 (dBm)", powSta1);
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cmd.AddValue("powSta2", "Power of STA2 (dBm)", powSta2);
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cmd.AddValue("powAp1", "Power of AP1 (dBm)", powAp1);
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cmd.AddValue("powAp2", "Power of AP2 (dBm)", powAp2);
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cmd.AddValue("ccaEdTrSta1", "CCA-ED Threshold of STA1 (dBm)", ccaEdTrSta1);
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cmd.AddValue("ccaEdTrSta2", "CCA-ED Threshold of STA2 (dBm)", ccaEdTrSta2);
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cmd.AddValue("ccaEdTrAp1", "CCA-ED Threshold of AP1 (dBm)", ccaEdTrAp1);
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cmd.AddValue("ccaEdTrAp2", "CCA-ED Threshold of AP2 (dBm)", ccaEdTrAp2);
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cmd.AddValue("minimumRssi",
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"Minimum RSSI for the ThresholdPreambleDetectionModel",
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minimumRssi);
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cmd.AddValue("channelBandwidth",
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"Bandwidth of the channel in MHz [20, 40, or 80]",
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channelBandwidth);
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cmd.AddValue("obssPdThreshold", "Threshold for the OBSS PD Algorithm", obssPdThreshold);
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cmd.AddValue("mcs", "The constant MCS value to transmit HE PPDUs", mcs);
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cmd.Parse(argc, argv);
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NodeContainer wifiStaNodes;
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wifiStaNodes.Create(2);
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NodeContainer wifiApNodes;
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wifiApNodes.Create(2);
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SpectrumWifiPhyHelper spectrumPhy;
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Ptr<MultiModelSpectrumChannel> spectrumChannel = CreateObject<MultiModelSpectrumChannel>();
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Ptr<FriisPropagationLossModel> lossModel = CreateObject<FriisPropagationLossModel>();
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spectrumChannel->AddPropagationLossModel(lossModel);
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Ptr<ConstantSpeedPropagationDelayModel> delayModel =
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CreateObject<ConstantSpeedPropagationDelayModel>();
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spectrumChannel->SetPropagationDelayModel(delayModel);
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spectrumPhy.SetChannel(spectrumChannel);
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spectrumPhy.SetErrorRateModel("ns3::YansErrorRateModel");
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switch (channelBandwidth)
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{
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case 20:
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spectrumPhy.Set("ChannelSettings", StringValue("{36, 20, BAND_5GHZ, 0}"));
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break;
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case 40:
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spectrumPhy.Set("ChannelSettings", StringValue("{62, 40, BAND_5GHZ, 0}"));
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break;
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case 80:
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spectrumPhy.Set("ChannelSettings", StringValue("{171, 80, BAND_5GHZ, 0}"));
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break;
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default:
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NS_ABORT_MSG("Unrecognized channel bandwidth: " << channelBandwidth);
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break;
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}
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spectrumPhy.SetPreambleDetectionModel("ns3::ThresholdPreambleDetectionModel",
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"MinimumRssi",
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DoubleValue(minimumRssi));
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WifiHelper wifi;
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wifi.SetStandard(WIFI_STANDARD_80211ax);
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if (enableObssPd)
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{
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wifi.SetObssPdAlgorithm("ns3::ConstantObssPdAlgorithm",
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"ObssPdLevel",
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DoubleValue(obssPdThreshold));
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}
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WifiMacHelper mac;
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std::ostringstream oss;
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oss << "HeMcs" << mcs;
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wifi.SetRemoteStationManager("ns3::ConstantRateWifiManager",
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"DataMode",
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StringValue(oss.str()),
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"ControlMode",
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StringValue(oss.str()));
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spectrumPhy.Set("TxPowerStart", DoubleValue(powSta1));
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spectrumPhy.Set("TxPowerEnd", DoubleValue(powSta1));
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spectrumPhy.Set("CcaEdThreshold", DoubleValue(ccaEdTrSta1));
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spectrumPhy.Set("RxSensitivity", DoubleValue(-92.0));
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Ssid ssidA = Ssid("A");
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mac.SetType("ns3::StaWifiMac", "Ssid", SsidValue(ssidA));
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NetDeviceContainer staDeviceA = wifi.Install(spectrumPhy, mac, wifiStaNodes.Get(0));
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spectrumPhy.Set("TxPowerStart", DoubleValue(powAp1));
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spectrumPhy.Set("TxPowerEnd", DoubleValue(powAp1));
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spectrumPhy.Set("CcaEdThreshold", DoubleValue(ccaEdTrAp1));
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spectrumPhy.Set("RxSensitivity", DoubleValue(-92.0));
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mac.SetType("ns3::ApWifiMac", "Ssid", SsidValue(ssidA));
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NetDeviceContainer apDeviceA = wifi.Install(spectrumPhy, mac, wifiApNodes.Get(0));
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Ptr<WifiNetDevice> apDevice = apDeviceA.Get(0)->GetObject<WifiNetDevice>();
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Ptr<ApWifiMac> apWifiMac = apDevice->GetMac()->GetObject<ApWifiMac>();
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if (enableObssPd)
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{
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apDevice->GetHeConfiguration()->SetAttribute("BssColor", UintegerValue(1));
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}
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spectrumPhy.Set("TxPowerStart", DoubleValue(powSta2));
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spectrumPhy.Set("TxPowerEnd", DoubleValue(powSta2));
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spectrumPhy.Set("CcaEdThreshold", DoubleValue(ccaEdTrSta2));
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spectrumPhy.Set("RxSensitivity", DoubleValue(-92.0));
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Ssid ssidB = Ssid("B");
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mac.SetType("ns3::StaWifiMac", "Ssid", SsidValue(ssidB));
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NetDeviceContainer staDeviceB = wifi.Install(spectrumPhy, mac, wifiStaNodes.Get(1));
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spectrumPhy.Set("TxPowerStart", DoubleValue(powAp2));
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spectrumPhy.Set("TxPowerEnd", DoubleValue(powAp2));
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spectrumPhy.Set("CcaEdThreshold", DoubleValue(ccaEdTrAp2));
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spectrumPhy.Set("RxSensitivity", DoubleValue(-92.0));
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mac.SetType("ns3::ApWifiMac", "Ssid", SsidValue(ssidB));
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NetDeviceContainer apDeviceB = wifi.Install(spectrumPhy, mac, wifiApNodes.Get(1));
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Ptr<WifiNetDevice> ap2Device = apDeviceB.Get(0)->GetObject<WifiNetDevice>();
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apWifiMac = ap2Device->GetMac()->GetObject<ApWifiMac>();
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if (enableObssPd)
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{
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ap2Device->GetHeConfiguration()->SetAttribute("BssColor", UintegerValue(2));
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}
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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)); // AP1
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positionAlloc->Add(Vector(d3, 0.0, 0.0)); // AP2
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positionAlloc->Add(Vector(0.0, d1, 0.0)); // STA1
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positionAlloc->Add(Vector(d3, d2, 0.0)); // STA2
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mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
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mobility.SetPositionAllocator(positionAlloc);
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mobility.Install(wifiApNodes);
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mobility.Install(wifiStaNodes);
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PacketSocketHelper packetSocket;
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packetSocket.Install(wifiApNodes);
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packetSocket.Install(wifiStaNodes);
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ApplicationContainer apps;
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// BSS 1
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{
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PacketSocketAddress socketAddr;
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socketAddr.SetSingleDevice(staDeviceA.Get(0)->GetIfIndex());
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socketAddr.SetPhysicalAddress(apDeviceA.Get(0)->GetAddress());
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socketAddr.SetProtocol(1);
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Ptr<PacketSocketClient> client = CreateObject<PacketSocketClient>();
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client->SetRemote(socketAddr);
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wifiStaNodes.Get(0)->AddApplication(client);
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client->SetAttribute("PacketSize", UintegerValue(payloadSize));
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client->SetAttribute("MaxPackets", UintegerValue(0));
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client->SetAttribute("Interval", TimeValue(Seconds(interval)));
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Ptr<PacketSocketServer> server = CreateObject<PacketSocketServer>();
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server->SetLocal(socketAddr);
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wifiApNodes.Get(0)->AddApplication(server);
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}
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// BSS 2
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{
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PacketSocketAddress socketAddr;
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socketAddr.SetSingleDevice(staDeviceB.Get(0)->GetIfIndex());
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socketAddr.SetPhysicalAddress(apDeviceB.Get(0)->GetAddress());
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socketAddr.SetProtocol(1);
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Ptr<PacketSocketClient> client = CreateObject<PacketSocketClient>();
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client->SetRemote(socketAddr);
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wifiStaNodes.Get(1)->AddApplication(client);
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client->SetAttribute("PacketSize", UintegerValue(payloadSize));
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client->SetAttribute("MaxPackets", UintegerValue(0));
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client->SetAttribute("Interval", TimeValue(Seconds(interval)));
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Ptr<PacketSocketServer> server = CreateObject<PacketSocketServer>();
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server->SetLocal(socketAddr);
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wifiApNodes.Get(1)->AddApplication(server);
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}
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Config::Connect("/NodeList/*/ApplicationList/*/$ns3::PacketSocketServer/Rx",
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MakeCallback(&SocketRx));
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Simulator::Stop(Seconds(duration));
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Simulator::Run();
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Simulator::Destroy();
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for (uint32_t i = 0; i < 2; i++)
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{
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double throughput = static_cast<double>(bytesReceived[2 + i]) * 8 / 1000 / 1000 / duration;
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std::cout << "Throughput for BSS " << i + 1 << ": " << throughput << " Mbit/s" << std::endl;
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}
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return 0;
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}
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