wifi spatial reuse results
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Nina
Aug 9, 2019, 5:32:53 AM8/9/19
to ns-3-users
Hello,
I have run wifi-spatial-reuse example from dev ns-3 version and got some results I can't explain. I am attaching results file but the gist is: starting mcs 3 all results are the same, whether or not obss is enabled - about 12Mbps. I understand that this is the maximum, considering the amount of data being sent. But, I do not understand why the simulation results are not affected by conflicts. The only thing I could think of is that all the data is being buffered and then transmitted at the first Tx opportunity - so there is no conflict and the result is the same with obss enabled or not.
Also, when I decrease interval (increase number of packets sent during simulation) I get strange results - for example, with mcs 5 and obss disabled both APs have even throughput of 25Mbps but with obss enabled first AP has tp 8Mbps and second AP has tp about 40Mbps. I could not explain this. Any thoughts? Other results in the attachment.
Nina
Nina
Aug 19, 2019, 10:57:51 AM8/19/19
to ns-3-users
I have run another similar simulation to the example wifi-spatial-reuse: interval is smaller then the one in example (0,00001), and I have decreased distance between AP and their respective stations, because I was simulating higher mcs. Results are exactly the same with obss function enabled and disabled. I thought APs were not close enough for there to be interference but even with 2m distance between them, results are the same. Does anyone have ideas why results are not affected by obss function?
Mateusz Kras
Nov 10, 2020, 1:29:51 PM11/10/20
to ns-3-users
Hello
Is it possible to see the gain in throughput for higher MCS valuest than 0? For example I run simulation for MCS 11 and I had 0 Mbps throughput. Even worse, I've got error message - "Should have one reception status per MPDU" for MCS 1-9 .
Just like Nina, I used example wifi-spatial-reuse form ns-3-dev (also ns-3.32).
ABDULJABBAR ALSHARIF
Nov 10, 2020, 3:34:48 PM11/10/20
to ns-3-...@googlegroups.com
hello
I didn't get your exact question. Do you want to just explain model modification or just some related work? I hope to keep your thoughts well .
contact me may be able to help you......
" if you want the rainbow you have deal with rains"
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Mateusz Kras
Nov 10, 2020, 4:41:25 PM11/10/20
to ns-3-users
I didn't want to start a new conversation because I found similar topic. I need to test 802.11ax in dense network and I want to check if Bss coloring gives any profit.
So my question is : Is It possible to test BSS coloring with higher MCS than 0 in current version of Ns-3 ? Because wifi-spatial-reuse example didn't work properly.
Maybe I'm doing something wrong but I didn't change anything except MCS value.
naish...@gmail.com
Sep 1, 2022, 5:57:12 AM9/1/22
to ns-3-users
Hi,
I am trying to increase the number of nodes in wifi-spatial-reuse.cc code for each BSS. But Im getting the following error " died with <Signals.SIGSEGV:11>".
Pls let me know where am I doing wrong.
Thank you.
This example program can be used to experiment with spatial
// reuse mechanisms of 802.11ax.
//
// The geometry is as follows:
//
// STA1 STA1
// | |
// d1 | |d2
// | d3 |
// AP1 -----------AP2
//
// STA1 and AP1 are in one BSS (with color set to 1), while STA2 and AP2 are in
// another BSS (with color set to 2). The distances are configurable (d1 through d3).
//
// STA1 is continously transmitting data to AP1, while STA2 is continuously sending data to AP2.
// Each STA has configurable traffic loads (inter packet interval and packet size).
// It is also possible to configure TX power per node as well as their CCA-ED tresholds.
// OBSS_PD spatial reuse feature can be enabled (default) or disabled, and the OBSS_PD
// threshold can be set as well (default: -72 dBm).
// A simple Friis path loss model is used and a constant PHY rate is considered.
//
// In general, the program can be configured at run-time by passing command-line arguments.
// The following command will display all of the available run-time help options:
// ./ns3 run "wifi-spatial-reuse --help"
//
// According to the Wi-Fi models of ns-3.36 release, throughput with
// OBSS PD enabled (--enableObssPd=True) was roughly 6.5 Mbps, and with
// it disabled (--enableObssPd=False) was roughly 3.5 Mbps.
//
// This difference between those results is because OBSS_PD spatial
// reuse enables to ignore transmissions from another BSS when the
// received power is below the configured threshold, and therefore
// either defer during ongoing transmission or transmit at the same
// time.
//
// Note that, by default, this script configures a network using a
// channel bandwidth of 20 MHz. Changing this value alone (through
// the --channelWidth argument) without properly adjusting other
// parameters will void the effect of spatial reuse: since energy is
// measured over the 20 MHz primary channel regardless of the channel
// width, doubling the transmission bandwidth creates a 3 dB drop in
// the measured energy level (i.e., a halving of the measured
// energy). Because of this, when using the channelWidth argument
// users should also adjust the CCA-ED Thresholds (via --ccaEdTrSta1,
// --ccaEdTrSta2, --ccaEdTrAp1, and --ccaEdTrAp2), the Minimum RSSI
// for preamble detection (via --minimumRssi), and the OBSS PD
// Threshold (via --obssPdThreshold) appropriately. For instance,
// this can be accomplished for a channel width of 40 MHz by lowering
// all these values by 3 dB compared to their defaults.
//
// In addition, consider that adapting the adjustments shown above
// for an 80 MHz bandwidth (using a 6 dB threshold adjustment instead
// of 3 dB) will not produce any changes when enableObssPd is enabled
// or disabled. The cause for this is the insufficient amount of
// traffic that is generated by default in the example: increasing
// the bandwidth shortens the frame durations, and lowers the
// collision probability. Collisions between BSSs are a necessary
// condition to see the improvements brought by spatial reuse, and
// thus increasing the amount of generated traffic by setting the
// interval argument to a lower value is necessary to see the
// benefits of spatial reuse in this scenario. This can, for
// instance, be accomplished by setting --interval=0.0001.
//
#include "ns3/abort.h"
#include "ns3/command-line.h"
#include "ns3/config.h"
#include "ns3/string.h"
#include "ns3/double.h"
#include "ns3/spectrum-wifi-helper.h"
#include "ns3/ssid.h"
#include "ns3/mobility-helper.h"
#include "ns3/application-container.h"
#include "ns3/multi-model-spectrum-channel.h"
#include "ns3/wifi-net-device.h"
#include "ns3/ap-wifi-mac.h"
#include "ns3/he-configuration.h"
#include "ns3/packet-socket-helper.h"
#include "ns3/packet-socket-client.h"
#include "ns3/packet-socket-server.h"
using namespace ns3;
std::vector<uint32_t> bytesReceived (4);
uint32_t
ContextToNodeId (std::string context)
{
std::string sub = context.substr (10);
uint32_t pos = sub.find ("/Device");
return atoi (sub.substr (0, pos).c_str ());
}
void
SocketRx (std::string context, Ptr<const Packet> p, const Address &addr)
{
uint32_t nodeId = ContextToNodeId (context);
bytesReceived[nodeId] += p->GetSize ();
}
int
main (int argc, char *argv[])
{
double duration = 10.0; // seconds
double d1 = 30.0; // meters
double d2 = 30.0; // meters
double d3 = 30.0; // meters
double d4 = 30.0; // meters
double d5 = 150.0; // meters
double powSta1 = 10.0; // dBm
double powSta2 = 10.0; // dBm
double powSta3 = 10.0; // dBm
double powSta4 = 10.0; // dBm
double powAp1 = 21.0; // dBm
double powAp2 = 21.0; // dBm
double ccaEdTrSta1 = -62; // dBm
double ccaEdTrSta2 = -62; // dBm
double ccaEdTrSta3 = -62; // dBm
double ccaEdTrSta4 = -62; // dBm
double ccaEdTrAp1 = -62; // dBm
double ccaEdTrAp2 = -62; // dBm
double minimumRssi = -82; // dBm
int channelBandwidth = 20; // MHz
uint32_t payloadSize = 1500; // bytes
uint32_t mcs = 0; // MCS value
double interval = 0.001; // seconds
bool enableObssPd = true;
double obssPdThreshold = -72.0; // dBm
CommandLine cmd (__FILE__);
cmd.AddValue ("duration", "Duration of simulation (s)", duration);
cmd.AddValue ("interval", "Inter packet interval (s)", interval);
cmd.AddValue ("enableObssPd", "Enable/disable OBSS_PD", enableObssPd);
cmd.AddValue ("d1", "Distance between STA1 and AP1 (m)", d1);
cmd.AddValue ("d2", "Distance between STA2 and AP2 (m)", d2);
cmd.AddValue ("d3", "Distance between STA3 and AP1 (m)", d3);
cmd.AddValue ("d4", "Distance between STA4 and AP2 (m)", d4);
cmd.AddValue ("d5", "Distance between AP1 and AP2 (m)", d5);
cmd.AddValue ("powSta1", "Power of STA1 (dBm)", powSta1);
cmd.AddValue ("powSta2", "Power of STA2 (dBm)", powSta2);
cmd.AddValue ("powSta3", "Power of STA3 (dBm)", powSta3);
cmd.AddValue ("powSta4", "Power of STA4 (dBm)", powSta4);
cmd.AddValue ("powAp1", "Power of AP1 (dBm)", powAp1);
cmd.AddValue ("powAp2", "Power of AP2 (dBm)", powAp2);
cmd.AddValue ("ccaEdTrSta1", "CCA-ED Threshold of STA1 (dBm)", ccaEdTrSta1);
cmd.AddValue ("ccaEdTrSta2", "CCA-ED Threshold of STA2 (dBm)", ccaEdTrSta2);
cmd.AddValue ("ccaEdTrSta3", "CCA-ED Threshold of STA3 (dBm)", ccaEdTrSta3);
cmd.AddValue ("ccaEdTrSta4", "CCA-ED Threshold of STA4 (dBm)", ccaEdTrSta4);
cmd.AddValue ("ccaEdTrAp1", "CCA-ED Threshold of AP1 (dBm)", ccaEdTrAp1);
cmd.AddValue ("ccaEdTrAp2", "CCA-ED Threshold of AP2 (dBm)", ccaEdTrAp2);
cmd.AddValue ("minimumRssi", "Minimum RSSI for the ThresholdPreambleDetectionModel", minimumRssi);
cmd.AddValue ("channelBandwidth", "Bandwidth of the channel in MHz [20, 40, or 80]", channelBandwidth);
cmd.AddValue ("obssPdThreshold", "Threshold for the OBSS PD Algorithm", obssPdThreshold);
cmd.AddValue ("mcs", "The constant MCS value to transmit HE PPDUs", mcs);
cmd.Parse (argc, argv);
NodeContainer wifiStaNodes;
wifiStaNodes.Create (4);
NodeContainer wifiApNodes;
wifiApNodes.Create (2);
SpectrumWifiPhyHelper spectrumPhy;
Ptr<MultiModelSpectrumChannel> spectrumChannel = CreateObject<MultiModelSpectrumChannel> ();
Ptr<FriisPropagationLossModel> lossModel = CreateObject<FriisPropagationLossModel> ();
spectrumChannel->AddPropagationLossModel (lossModel);
Ptr<ConstantSpeedPropagationDelayModel> delayModel = CreateObject<ConstantSpeedPropagationDelayModel> ();
spectrumChannel->SetPropagationDelayModel (delayModel);
spectrumPhy.SetChannel (spectrumChannel);
spectrumPhy.SetErrorRateModel ("ns3::YansErrorRateModel");
switch (channelBandwidth)
{
case 20:
spectrumPhy.Set ("ChannelSettings", StringValue ("{36, 20, BAND_5GHZ, 0}"));
break;
case 40:
spectrumPhy.Set ("ChannelSettings", StringValue ("{62, 40, BAND_5GHZ, 0}"));
break;
case 80:
spectrumPhy.Set ("ChannelSettings", StringValue ("{171, 80, BAND_5GHZ, 0}"));
break;
default:
NS_ABORT_MSG ("Unrecognized channel bandwidth: " << channelBandwidth);
break;
}
spectrumPhy.SetPreambleDetectionModel ("ns3::ThresholdPreambleDetectionModel",
"MinimumRssi", DoubleValue (minimumRssi));
WifiHelper wifi;
wifi.SetStandard (WIFI_STANDARD_80211ax);
if (enableObssPd)
{
wifi.SetObssPdAlgorithm ("ns3::ConstantObssPdAlgorithm",
"ObssPdLevel", DoubleValue (obssPdThreshold));
}
WifiMacHelper mac;
std::ostringstream oss;
oss << "HeMcs" << mcs;
wifi.SetRemoteStationManager ("ns3::ConstantRateWifiManager",
"DataMode", StringValue (oss.str ()),
"ControlMode", StringValue (oss.str ()));
// wifi.SetRemoteStationManager ("ns3::MistrelHtWifiManager");
spectrumPhy.Set ("TxPowerStart", DoubleValue (powSta1));
spectrumPhy.Set ("TxPowerEnd", DoubleValue (powSta1));
spectrumPhy.Set ("CcaEdThreshold", DoubleValue (ccaEdTrSta1));
spectrumPhy.Set ("RxSensitivity", DoubleValue (-92.0));
Ssid ssidA = Ssid ("A");
mac.SetType ("ns3::StaWifiMac",
"Ssid", SsidValue (ssidA));
NetDeviceContainer staDeviceA = wifi.Install (spectrumPhy, mac, wifiStaNodes.Get (0));
spectrumPhy.Set ("TxPowerStart", DoubleValue (powAp1));
spectrumPhy.Set ("TxPowerEnd", DoubleValue (powAp1));
spectrumPhy.Set ("CcaEdThreshold", DoubleValue (ccaEdTrAp1));
spectrumPhy.Set ("RxSensitivity", DoubleValue (-92.0));
mac.SetType ("ns3::ApWifiMac",
"Ssid", SsidValue (ssidA));
NetDeviceContainer apDeviceA = wifi.Install (spectrumPhy, mac, wifiApNodes.Get (0));
Ptr<WifiNetDevice> apDevice = apDeviceA.Get (0)->GetObject<WifiNetDevice> ();
Ptr<ApWifiMac> apWifiMac = apDevice->GetMac ()->GetObject<ApWifiMac> ();
if (enableObssPd)
{
apDevice->GetHeConfiguration ()->SetAttribute ("BssColor", UintegerValue (1));
}
spectrumPhy.Set ("TxPowerStart", DoubleValue (powSta3));
spectrumPhy.Set ("TxPowerEnd", DoubleValue (powSta3));
spectrumPhy.Set ("CcaEdThreshold", DoubleValue (ccaEdTrSta3));
spectrumPhy.Set ("RxSensitivity", DoubleValue (-92.0));
Ssid ssidC = Ssid ("C");
mac.SetType ("ns3::StaWifiMac",
"Ssid", SsidValue (ssidC));
NetDeviceContainer staDeviceC = wifi.Install (spectrumPhy, mac, wifiStaNodes.Get (0));
spectrumPhy.Set ("TxPowerStart", DoubleValue (powAp1));
spectrumPhy.Set ("TxPowerEnd", DoubleValue (powAp1));
spectrumPhy.Set ("CcaEdThreshold", DoubleValue (ccaEdTrAp1));
spectrumPhy.Set ("RxSensitivity", DoubleValue (-92.0));
mac.SetType ("ns3::ApWifiMac",
"Ssid", SsidValue (ssidC));
NetDeviceContainer apDeviceC = wifi.Install (spectrumPhy, mac, wifiApNodes.Get (0));
Ptr<WifiNetDevice> ap3Device = apDeviceC.Get (0)->GetObject<WifiNetDevice> ();
apWifiMac = ap3Device->GetMac ()->GetObject<ApWifiMac> ();
if (enableObssPd)
{
ap3Device->GetHeConfiguration ()->SetAttribute ("BssColor", UintegerValue (1));
}
spectrumPhy.Set ("TxPowerStart", DoubleValue (powSta2));
spectrumPhy.Set ("TxPowerEnd", DoubleValue (powSta2));
spectrumPhy.Set ("CcaEdThreshold", DoubleValue (ccaEdTrSta2));
spectrumPhy.Set ("RxSensitivity", DoubleValue (-92.0));
Ssid ssidB = Ssid ("B");
mac.SetType ("ns3::StaWifiMac",
"Ssid", SsidValue (ssidB));
NetDeviceContainer staDeviceB = wifi.Install (spectrumPhy, mac, wifiStaNodes.Get (1));
spectrumPhy.Set ("TxPowerStart", DoubleValue (powAp2));
spectrumPhy.Set ("TxPowerEnd", DoubleValue (powAp2));
spectrumPhy.Set ("CcaEdThreshold", DoubleValue (ccaEdTrAp2));
spectrumPhy.Set ("RxSensitivity", DoubleValue (-92.0));
mac.SetType ("ns3::ApWifiMac",
"Ssid", SsidValue (ssidB));
NetDeviceContainer apDeviceB = wifi.Install (spectrumPhy, mac, wifiApNodes.Get (1));
Ptr<WifiNetDevice> ap2Device = apDeviceB.Get (0)->GetObject<WifiNetDevice> ();
apWifiMac = ap2Device->GetMac ()->GetObject<ApWifiMac> ();
if (enableObssPd)
{
ap2Device->GetHeConfiguration ()->SetAttribute ("BssColor", UintegerValue (2));
}
spectrumPhy.Set ("TxPowerStart", DoubleValue (powSta4));
spectrumPhy.Set ("TxPowerEnd", DoubleValue (powSta4));
spectrumPhy.Set ("CcaEdThreshold", DoubleValue (ccaEdTrSta4));
spectrumPhy.Set ("RxSensitivity", DoubleValue (-92.0));
Ssid ssidD = Ssid ("D");
mac.SetType ("ns3::StaWifiMac",
"Ssid", SsidValue (ssidD));
NetDeviceContainer staDeviceD = wifi.Install (spectrumPhy, mac, wifiStaNodes.Get (1));
spectrumPhy.Set ("TxPowerStart", DoubleValue (powAp2));
spectrumPhy.Set ("TxPowerEnd", DoubleValue (powAp2));
spectrumPhy.Set ("CcaEdThreshold", DoubleValue (ccaEdTrAp2));
spectrumPhy.Set ("RxSensitivity", DoubleValue (-92.0));
mac.SetType ("ns3::ApWifiMac",
"Ssid", SsidValue (ssidD));
NetDeviceContainer apDeviceD = wifi.Install (spectrumPhy, mac, wifiApNodes.Get (1));
Ptr<WifiNetDevice> ap4Device = apDeviceD.Get (0)->GetObject<WifiNetDevice> ();
apWifiMac = ap4Device->GetMac ()->GetObject<ApWifiMac> ();
if (enableObssPd)
{
ap4Device->GetHeConfiguration ()->SetAttribute ("BssColor", UintegerValue (2));
}
MobilityHelper mobility;
Ptr<ListPositionAllocator> positionAlloc = CreateObject<ListPositionAllocator> ();
positionAlloc->Add (Vector (0.0, 0.0, 0.0)); // AP1
positionAlloc->Add (Vector (d5, 0.0, 0.0)); // AP2
positionAlloc->Add (Vector (0.0, d1, 0.0)); // STA1
positionAlloc->Add (Vector (d5, d2, 0.0)); // STA2
positionAlloc->Add (Vector (d2, d1, 0.0)); // STA3
positionAlloc->Add (Vector (d5, -d2, 0.0)); // STA4
mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
mobility.SetPositionAllocator (positionAlloc);
mobility.Install (wifiApNodes);
mobility.Install (wifiStaNodes);
PacketSocketHelper packetSocket;
packetSocket.Install (wifiApNodes);
packetSocket.Install (wifiStaNodes);
ApplicationContainer apps;
TypeId tid = TypeId::LookupByName ("ns3::UdpSocketFactory");
//BSS 1
{
PacketSocketAddress socketAddr;
socketAddr.SetSingleDevice (staDeviceA.Get (0)->GetIfIndex ());
socketAddr.SetPhysicalAddress (apDeviceA.Get (0)->GetAddress ());
// socketAddr.SetSingleDevice (staDeviceC.Get (0)->GetIfIndex ());
//socketAddr.SetPhysicalAddress (apDeviceC.Get (0)->GetAddress ());
socketAddr.SetProtocol (1);
Ptr<PacketSocketClient> client = CreateObject<PacketSocketClient> ();
client->SetRemote (socketAddr);
wifiStaNodes.Get (0)->AddApplication (client);
//wifiStaNodes.Get (3)->AddApplication (client);
client->SetAttribute ("PacketSize", UintegerValue (payloadSize));
client->SetAttribute ("MaxPackets", UintegerValue (0));
client->SetAttribute ("Interval", TimeValue (Seconds (interval)));
Ptr<PacketSocketServer> server = CreateObject<PacketSocketServer> ();
server->SetLocal (socketAddr);
wifiApNodes.Get (0)->AddApplication (server);
}
// BSS 2
{
PacketSocketAddress socketAddr;
socketAddr.SetSingleDevice (staDeviceB.Get (0)->GetIfIndex ());
socketAddr.SetPhysicalAddress (apDeviceB.Get (0)->GetAddress ());
// socketAddr.SetSingleDevice (staDeviceD.Get (0)->GetIfIndex ());
//socketAddr.SetPhysicalAddress (apDeviceD.Get (0)->GetAddress ());
socketAddr.SetProtocol (1);
Ptr<PacketSocketClient> client = CreateObject<PacketSocketClient> ();
client->SetRemote (socketAddr);
wifiStaNodes.Get (1)->AddApplication (client);
//wifiStaNodes.Get (4)->AddApplication (client);
client->SetAttribute ("PacketSize", UintegerValue (payloadSize));
client->SetAttribute ("MaxPackets", UintegerValue (0));
client->SetAttribute ("Interval", TimeValue (Seconds (interval)));
Ptr<PacketSocketServer> server = CreateObject<PacketSocketServer> ();
server->SetLocal (socketAddr);
wifiApNodes.Get (1)->AddApplication (server);
}
//BSS 1
{
PacketSocketAddress socketAddr;
// socketAddr.SetSingleDevice (staDeviceA.Get (0)->GetIfIndex ());
// socketAddr.SetPhysicalAddress (apDeviceA.Get (0)->GetAddress ());
socketAddr.SetSingleDevice (staDeviceC.Get (0)->GetIfIndex ());
socketAddr.SetPhysicalAddress (apDeviceC.Get (0)->GetAddress ());
socketAddr.SetProtocol (1);
Ptr<PacketSocketClient> client = CreateObject<PacketSocketClient> ();
client->SetRemote (socketAddr);
// wifiStaNodes.Get (0)->AddApplication (client);
wifiStaNodes.Get (3)->AddApplication (client);
client->SetAttribute ("PacketSize", UintegerValue (payloadSize));
client->SetAttribute ("MaxPackets", UintegerValue (0));
client->SetAttribute ("Interval", TimeValue (Seconds (interval)));
Ptr<PacketSocketServer> server = CreateObject<PacketSocketServer> ();
server->SetLocal (socketAddr);
wifiApNodes.Get (0)->AddApplication (server);
}
// BSS 2
{
PacketSocketAddress socketAddr;
//socketAddr.SetSingleDevice (staDeviceB.Get (0)->GetIfIndex ());
//socketAddr.SetPhysicalAddress (apDeviceB.Get (0)->GetAddress ());
socketAddr.SetSingleDevice (staDeviceD.Get (0)->GetIfIndex ());
socketAddr.SetPhysicalAddress (apDeviceD.Get (0)->GetAddress ());
socketAddr.SetProtocol (1);
Ptr<PacketSocketClient> client = CreateObject<PacketSocketClient> ();
client->SetRemote (socketAddr);
//wifiStaNodes.Get (1)->AddApplication (client);
wifiStaNodes.Get (4)->AddApplication (client);
client->SetAttribute ("PacketSize", UintegerValue (payloadSize));
client->SetAttribute ("MaxPackets", UintegerValue (0));
client->SetAttribute ("Interval", TimeValue (Seconds (interval)));
Ptr<PacketSocketServer> server = CreateObject<PacketSocketServer> ();
server->SetLocal (socketAddr);
wifiApNodes.Get (1)->AddApplication (server);
}
Config::Connect ("/NodeList/*/ApplicationList/*/$ns3::PacketSocketServer/Rx", MakeCallback (&SocketRx));
Simulator::Stop (Seconds (duration));
Simulator::Run ();
Simulator::Destroy ();
for (uint32_t i = 0; i < 2; i++)
{
double throughput = static_cast<double> (bytesReceived[2 + i]) * 8 / 1000 / 1000 / duration;
std::cout << "Throughput for BSS " << i + 1 << ": " << throughput << " Mbit/s" << std::endl;
}
return 0;
}
// reuse mechanisms of 802.11ax.
//
// The geometry is as follows:
//
// STA1 STA1
// | |
// d1 | |d2
// | d3 |
// AP1 -----------AP2
//
// STA1 and AP1 are in one BSS (with color set to 1), while STA2 and AP2 are in
// another BSS (with color set to 2). The distances are configurable (d1 through d3).
//
// STA1 is continously transmitting data to AP1, while STA2 is continuously sending data to AP2.
// Each STA has configurable traffic loads (inter packet interval and packet size).
// It is also possible to configure TX power per node as well as their CCA-ED tresholds.
// OBSS_PD spatial reuse feature can be enabled (default) or disabled, and the OBSS_PD
// threshold can be set as well (default: -72 dBm).
// A simple Friis path loss model is used and a constant PHY rate is considered.
//
// In general, the program can be configured at run-time by passing command-line arguments.
// The following command will display all of the available run-time help options:
// ./ns3 run "wifi-spatial-reuse --help"
//
// According to the Wi-Fi models of ns-3.36 release, throughput with
// OBSS PD enabled (--enableObssPd=True) was roughly 6.5 Mbps, and with
// it disabled (--enableObssPd=False) was roughly 3.5 Mbps.
//
// This difference between those results is because OBSS_PD spatial
// reuse enables to ignore transmissions from another BSS when the
// received power is below the configured threshold, and therefore
// either defer during ongoing transmission or transmit at the same
// time.
//
// Note that, by default, this script configures a network using a
// channel bandwidth of 20 MHz. Changing this value alone (through
// the --channelWidth argument) without properly adjusting other
// parameters will void the effect of spatial reuse: since energy is
// measured over the 20 MHz primary channel regardless of the channel
// width, doubling the transmission bandwidth creates a 3 dB drop in
// the measured energy level (i.e., a halving of the measured
// energy). Because of this, when using the channelWidth argument
// users should also adjust the CCA-ED Thresholds (via --ccaEdTrSta1,
// --ccaEdTrSta2, --ccaEdTrAp1, and --ccaEdTrAp2), the Minimum RSSI
// for preamble detection (via --minimumRssi), and the OBSS PD
// Threshold (via --obssPdThreshold) appropriately. For instance,
// this can be accomplished for a channel width of 40 MHz by lowering
// all these values by 3 dB compared to their defaults.
//
// In addition, consider that adapting the adjustments shown above
// for an 80 MHz bandwidth (using a 6 dB threshold adjustment instead
// of 3 dB) will not produce any changes when enableObssPd is enabled
// or disabled. The cause for this is the insufficient amount of
// traffic that is generated by default in the example: increasing
// the bandwidth shortens the frame durations, and lowers the
// collision probability. Collisions between BSSs are a necessary
// condition to see the improvements brought by spatial reuse, and
// thus increasing the amount of generated traffic by setting the
// interval argument to a lower value is necessary to see the
// benefits of spatial reuse in this scenario. This can, for
// instance, be accomplished by setting --interval=0.0001.
//
#include "ns3/abort.h"
#include "ns3/command-line.h"
#include "ns3/config.h"
#include "ns3/string.h"
#include "ns3/double.h"
#include "ns3/spectrum-wifi-helper.h"
#include "ns3/ssid.h"
#include "ns3/mobility-helper.h"
#include "ns3/application-container.h"
#include "ns3/multi-model-spectrum-channel.h"
#include "ns3/wifi-net-device.h"
#include "ns3/ap-wifi-mac.h"
#include "ns3/he-configuration.h"
#include "ns3/packet-socket-helper.h"
#include "ns3/packet-socket-client.h"
#include "ns3/packet-socket-server.h"
using namespace ns3;
std::vector<uint32_t> bytesReceived (4);
uint32_t
ContextToNodeId (std::string context)
{
std::string sub = context.substr (10);
uint32_t pos = sub.find ("/Device");
return atoi (sub.substr (0, pos).c_str ());
}
void
SocketRx (std::string context, Ptr<const Packet> p, const Address &addr)
{
uint32_t nodeId = ContextToNodeId (context);
bytesReceived[nodeId] += p->GetSize ();
}
int
main (int argc, char *argv[])
{
double duration = 10.0; // seconds
double d1 = 30.0; // meters
double d2 = 30.0; // meters
double d3 = 30.0; // meters
double d4 = 30.0; // meters
double d5 = 150.0; // meters
double powSta1 = 10.0; // dBm
double powSta2 = 10.0; // dBm
double powSta3 = 10.0; // dBm
double powSta4 = 10.0; // dBm
double powAp1 = 21.0; // dBm
double powAp2 = 21.0; // dBm
double ccaEdTrSta1 = -62; // dBm
double ccaEdTrSta2 = -62; // dBm
double ccaEdTrSta3 = -62; // dBm
double ccaEdTrSta4 = -62; // dBm
double ccaEdTrAp1 = -62; // dBm
double ccaEdTrAp2 = -62; // dBm
double minimumRssi = -82; // dBm
int channelBandwidth = 20; // MHz
uint32_t payloadSize = 1500; // bytes
uint32_t mcs = 0; // MCS value
double interval = 0.001; // seconds
bool enableObssPd = true;
double obssPdThreshold = -72.0; // dBm
CommandLine cmd (__FILE__);
cmd.AddValue ("duration", "Duration of simulation (s)", duration);
cmd.AddValue ("interval", "Inter packet interval (s)", interval);
cmd.AddValue ("enableObssPd", "Enable/disable OBSS_PD", enableObssPd);
cmd.AddValue ("d1", "Distance between STA1 and AP1 (m)", d1);
cmd.AddValue ("d2", "Distance between STA2 and AP2 (m)", d2);
cmd.AddValue ("d3", "Distance between STA3 and AP1 (m)", d3);
cmd.AddValue ("d4", "Distance between STA4 and AP2 (m)", d4);
cmd.AddValue ("d5", "Distance between AP1 and AP2 (m)", d5);
cmd.AddValue ("powSta1", "Power of STA1 (dBm)", powSta1);
cmd.AddValue ("powSta2", "Power of STA2 (dBm)", powSta2);
cmd.AddValue ("powSta3", "Power of STA3 (dBm)", powSta3);
cmd.AddValue ("powSta4", "Power of STA4 (dBm)", powSta4);
cmd.AddValue ("powAp1", "Power of AP1 (dBm)", powAp1);
cmd.AddValue ("powAp2", "Power of AP2 (dBm)", powAp2);
cmd.AddValue ("ccaEdTrSta1", "CCA-ED Threshold of STA1 (dBm)", ccaEdTrSta1);
cmd.AddValue ("ccaEdTrSta2", "CCA-ED Threshold of STA2 (dBm)", ccaEdTrSta2);
cmd.AddValue ("ccaEdTrSta3", "CCA-ED Threshold of STA3 (dBm)", ccaEdTrSta3);
cmd.AddValue ("ccaEdTrSta4", "CCA-ED Threshold of STA4 (dBm)", ccaEdTrSta4);
cmd.AddValue ("ccaEdTrAp1", "CCA-ED Threshold of AP1 (dBm)", ccaEdTrAp1);
cmd.AddValue ("ccaEdTrAp2", "CCA-ED Threshold of AP2 (dBm)", ccaEdTrAp2);
cmd.AddValue ("minimumRssi", "Minimum RSSI for the ThresholdPreambleDetectionModel", minimumRssi);
cmd.AddValue ("channelBandwidth", "Bandwidth of the channel in MHz [20, 40, or 80]", channelBandwidth);
cmd.AddValue ("obssPdThreshold", "Threshold for the OBSS PD Algorithm", obssPdThreshold);
cmd.AddValue ("mcs", "The constant MCS value to transmit HE PPDUs", mcs);
cmd.Parse (argc, argv);
NodeContainer wifiStaNodes;
wifiStaNodes.Create (4);
NodeContainer wifiApNodes;
wifiApNodes.Create (2);
SpectrumWifiPhyHelper spectrumPhy;
Ptr<MultiModelSpectrumChannel> spectrumChannel = CreateObject<MultiModelSpectrumChannel> ();
Ptr<FriisPropagationLossModel> lossModel = CreateObject<FriisPropagationLossModel> ();
spectrumChannel->AddPropagationLossModel (lossModel);
Ptr<ConstantSpeedPropagationDelayModel> delayModel = CreateObject<ConstantSpeedPropagationDelayModel> ();
spectrumChannel->SetPropagationDelayModel (delayModel);
spectrumPhy.SetChannel (spectrumChannel);
spectrumPhy.SetErrorRateModel ("ns3::YansErrorRateModel");
switch (channelBandwidth)
{
case 20:
spectrumPhy.Set ("ChannelSettings", StringValue ("{36, 20, BAND_5GHZ, 0}"));
break;
case 40:
spectrumPhy.Set ("ChannelSettings", StringValue ("{62, 40, BAND_5GHZ, 0}"));
break;
case 80:
spectrumPhy.Set ("ChannelSettings", StringValue ("{171, 80, BAND_5GHZ, 0}"));
break;
default:
NS_ABORT_MSG ("Unrecognized channel bandwidth: " << channelBandwidth);
break;
}
spectrumPhy.SetPreambleDetectionModel ("ns3::ThresholdPreambleDetectionModel",
"MinimumRssi", DoubleValue (minimumRssi));
WifiHelper wifi;
wifi.SetStandard (WIFI_STANDARD_80211ax);
if (enableObssPd)
{
wifi.SetObssPdAlgorithm ("ns3::ConstantObssPdAlgorithm",
"ObssPdLevel", DoubleValue (obssPdThreshold));
}
WifiMacHelper mac;
std::ostringstream oss;
oss << "HeMcs" << mcs;
wifi.SetRemoteStationManager ("ns3::ConstantRateWifiManager",
"DataMode", StringValue (oss.str ()),
"ControlMode", StringValue (oss.str ()));
// wifi.SetRemoteStationManager ("ns3::MistrelHtWifiManager");
spectrumPhy.Set ("TxPowerStart", DoubleValue (powSta1));
spectrumPhy.Set ("TxPowerEnd", DoubleValue (powSta1));
spectrumPhy.Set ("CcaEdThreshold", DoubleValue (ccaEdTrSta1));
spectrumPhy.Set ("RxSensitivity", DoubleValue (-92.0));
Ssid ssidA = Ssid ("A");
mac.SetType ("ns3::StaWifiMac",
"Ssid", SsidValue (ssidA));
NetDeviceContainer staDeviceA = wifi.Install (spectrumPhy, mac, wifiStaNodes.Get (0));
spectrumPhy.Set ("TxPowerStart", DoubleValue (powAp1));
spectrumPhy.Set ("TxPowerEnd", DoubleValue (powAp1));
spectrumPhy.Set ("CcaEdThreshold", DoubleValue (ccaEdTrAp1));
spectrumPhy.Set ("RxSensitivity", DoubleValue (-92.0));
mac.SetType ("ns3::ApWifiMac",
"Ssid", SsidValue (ssidA));
NetDeviceContainer apDeviceA = wifi.Install (spectrumPhy, mac, wifiApNodes.Get (0));
Ptr<WifiNetDevice> apDevice = apDeviceA.Get (0)->GetObject<WifiNetDevice> ();
Ptr<ApWifiMac> apWifiMac = apDevice->GetMac ()->GetObject<ApWifiMac> ();
if (enableObssPd)
{
apDevice->GetHeConfiguration ()->SetAttribute ("BssColor", UintegerValue (1));
}
spectrumPhy.Set ("TxPowerStart", DoubleValue (powSta3));
spectrumPhy.Set ("TxPowerEnd", DoubleValue (powSta3));
spectrumPhy.Set ("CcaEdThreshold", DoubleValue (ccaEdTrSta3));
spectrumPhy.Set ("RxSensitivity", DoubleValue (-92.0));
Ssid ssidC = Ssid ("C");
mac.SetType ("ns3::StaWifiMac",
"Ssid", SsidValue (ssidC));
NetDeviceContainer staDeviceC = wifi.Install (spectrumPhy, mac, wifiStaNodes.Get (0));
spectrumPhy.Set ("TxPowerStart", DoubleValue (powAp1));
spectrumPhy.Set ("TxPowerEnd", DoubleValue (powAp1));
spectrumPhy.Set ("CcaEdThreshold", DoubleValue (ccaEdTrAp1));
spectrumPhy.Set ("RxSensitivity", DoubleValue (-92.0));
mac.SetType ("ns3::ApWifiMac",
"Ssid", SsidValue (ssidC));
NetDeviceContainer apDeviceC = wifi.Install (spectrumPhy, mac, wifiApNodes.Get (0));
Ptr<WifiNetDevice> ap3Device = apDeviceC.Get (0)->GetObject<WifiNetDevice> ();
apWifiMac = ap3Device->GetMac ()->GetObject<ApWifiMac> ();
if (enableObssPd)
{
ap3Device->GetHeConfiguration ()->SetAttribute ("BssColor", UintegerValue (1));
}
spectrumPhy.Set ("TxPowerStart", DoubleValue (powSta2));
spectrumPhy.Set ("TxPowerEnd", DoubleValue (powSta2));
spectrumPhy.Set ("CcaEdThreshold", DoubleValue (ccaEdTrSta2));
spectrumPhy.Set ("RxSensitivity", DoubleValue (-92.0));
Ssid ssidB = Ssid ("B");
mac.SetType ("ns3::StaWifiMac",
"Ssid", SsidValue (ssidB));
NetDeviceContainer staDeviceB = wifi.Install (spectrumPhy, mac, wifiStaNodes.Get (1));
spectrumPhy.Set ("TxPowerStart", DoubleValue (powAp2));
spectrumPhy.Set ("TxPowerEnd", DoubleValue (powAp2));
spectrumPhy.Set ("CcaEdThreshold", DoubleValue (ccaEdTrAp2));
spectrumPhy.Set ("RxSensitivity", DoubleValue (-92.0));
mac.SetType ("ns3::ApWifiMac",
"Ssid", SsidValue (ssidB));
NetDeviceContainer apDeviceB = wifi.Install (spectrumPhy, mac, wifiApNodes.Get (1));
Ptr<WifiNetDevice> ap2Device = apDeviceB.Get (0)->GetObject<WifiNetDevice> ();
apWifiMac = ap2Device->GetMac ()->GetObject<ApWifiMac> ();
if (enableObssPd)
{
ap2Device->GetHeConfiguration ()->SetAttribute ("BssColor", UintegerValue (2));
}
spectrumPhy.Set ("TxPowerStart", DoubleValue (powSta4));
spectrumPhy.Set ("TxPowerEnd", DoubleValue (powSta4));
spectrumPhy.Set ("CcaEdThreshold", DoubleValue (ccaEdTrSta4));
spectrumPhy.Set ("RxSensitivity", DoubleValue (-92.0));
Ssid ssidD = Ssid ("D");
mac.SetType ("ns3::StaWifiMac",
"Ssid", SsidValue (ssidD));
NetDeviceContainer staDeviceD = wifi.Install (spectrumPhy, mac, wifiStaNodes.Get (1));
spectrumPhy.Set ("TxPowerStart", DoubleValue (powAp2));
spectrumPhy.Set ("TxPowerEnd", DoubleValue (powAp2));
spectrumPhy.Set ("CcaEdThreshold", DoubleValue (ccaEdTrAp2));
spectrumPhy.Set ("RxSensitivity", DoubleValue (-92.0));
mac.SetType ("ns3::ApWifiMac",
"Ssid", SsidValue (ssidD));
NetDeviceContainer apDeviceD = wifi.Install (spectrumPhy, mac, wifiApNodes.Get (1));
Ptr<WifiNetDevice> ap4Device = apDeviceD.Get (0)->GetObject<WifiNetDevice> ();
apWifiMac = ap4Device->GetMac ()->GetObject<ApWifiMac> ();
if (enableObssPd)
{
ap4Device->GetHeConfiguration ()->SetAttribute ("BssColor", UintegerValue (2));
}
MobilityHelper mobility;
Ptr<ListPositionAllocator> positionAlloc = CreateObject<ListPositionAllocator> ();
positionAlloc->Add (Vector (0.0, 0.0, 0.0)); // AP1
positionAlloc->Add (Vector (d5, 0.0, 0.0)); // AP2
positionAlloc->Add (Vector (0.0, d1, 0.0)); // STA1
positionAlloc->Add (Vector (d5, d2, 0.0)); // STA2
positionAlloc->Add (Vector (d2, d1, 0.0)); // STA3
positionAlloc->Add (Vector (d5, -d2, 0.0)); // STA4
mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
mobility.SetPositionAllocator (positionAlloc);
mobility.Install (wifiApNodes);
mobility.Install (wifiStaNodes);
PacketSocketHelper packetSocket;
packetSocket.Install (wifiApNodes);
packetSocket.Install (wifiStaNodes);
ApplicationContainer apps;
TypeId tid = TypeId::LookupByName ("ns3::UdpSocketFactory");
//BSS 1
{
PacketSocketAddress socketAddr;
socketAddr.SetSingleDevice (staDeviceA.Get (0)->GetIfIndex ());
socketAddr.SetPhysicalAddress (apDeviceA.Get (0)->GetAddress ());
// socketAddr.SetSingleDevice (staDeviceC.Get (0)->GetIfIndex ());
//socketAddr.SetPhysicalAddress (apDeviceC.Get (0)->GetAddress ());
socketAddr.SetProtocol (1);
Ptr<PacketSocketClient> client = CreateObject<PacketSocketClient> ();
client->SetRemote (socketAddr);
wifiStaNodes.Get (0)->AddApplication (client);
//wifiStaNodes.Get (3)->AddApplication (client);
client->SetAttribute ("PacketSize", UintegerValue (payloadSize));
client->SetAttribute ("MaxPackets", UintegerValue (0));
client->SetAttribute ("Interval", TimeValue (Seconds (interval)));
Ptr<PacketSocketServer> server = CreateObject<PacketSocketServer> ();
server->SetLocal (socketAddr);
wifiApNodes.Get (0)->AddApplication (server);
}
// BSS 2
{
PacketSocketAddress socketAddr;
socketAddr.SetSingleDevice (staDeviceB.Get (0)->GetIfIndex ());
socketAddr.SetPhysicalAddress (apDeviceB.Get (0)->GetAddress ());
// socketAddr.SetSingleDevice (staDeviceD.Get (0)->GetIfIndex ());
//socketAddr.SetPhysicalAddress (apDeviceD.Get (0)->GetAddress ());
socketAddr.SetProtocol (1);
Ptr<PacketSocketClient> client = CreateObject<PacketSocketClient> ();
client->SetRemote (socketAddr);
wifiStaNodes.Get (1)->AddApplication (client);
//wifiStaNodes.Get (4)->AddApplication (client);
client->SetAttribute ("PacketSize", UintegerValue (payloadSize));
client->SetAttribute ("MaxPackets", UintegerValue (0));
client->SetAttribute ("Interval", TimeValue (Seconds (interval)));
Ptr<PacketSocketServer> server = CreateObject<PacketSocketServer> ();
server->SetLocal (socketAddr);
wifiApNodes.Get (1)->AddApplication (server);
}
//BSS 1
{
PacketSocketAddress socketAddr;
// socketAddr.SetSingleDevice (staDeviceA.Get (0)->GetIfIndex ());
// socketAddr.SetPhysicalAddress (apDeviceA.Get (0)->GetAddress ());
socketAddr.SetSingleDevice (staDeviceC.Get (0)->GetIfIndex ());
socketAddr.SetPhysicalAddress (apDeviceC.Get (0)->GetAddress ());
socketAddr.SetProtocol (1);
Ptr<PacketSocketClient> client = CreateObject<PacketSocketClient> ();
client->SetRemote (socketAddr);
// wifiStaNodes.Get (0)->AddApplication (client);
wifiStaNodes.Get (3)->AddApplication (client);
client->SetAttribute ("PacketSize", UintegerValue (payloadSize));
client->SetAttribute ("MaxPackets", UintegerValue (0));
client->SetAttribute ("Interval", TimeValue (Seconds (interval)));
Ptr<PacketSocketServer> server = CreateObject<PacketSocketServer> ();
server->SetLocal (socketAddr);
wifiApNodes.Get (0)->AddApplication (server);
}
// BSS 2
{
PacketSocketAddress socketAddr;
//socketAddr.SetSingleDevice (staDeviceB.Get (0)->GetIfIndex ());
//socketAddr.SetPhysicalAddress (apDeviceB.Get (0)->GetAddress ());
socketAddr.SetSingleDevice (staDeviceD.Get (0)->GetIfIndex ());
socketAddr.SetPhysicalAddress (apDeviceD.Get (0)->GetAddress ());
socketAddr.SetProtocol (1);
Ptr<PacketSocketClient> client = CreateObject<PacketSocketClient> ();
client->SetRemote (socketAddr);
//wifiStaNodes.Get (1)->AddApplication (client);
wifiStaNodes.Get (4)->AddApplication (client);
client->SetAttribute ("PacketSize", UintegerValue (payloadSize));
client->SetAttribute ("MaxPackets", UintegerValue (0));
client->SetAttribute ("Interval", TimeValue (Seconds (interval)));
Ptr<PacketSocketServer> server = CreateObject<PacketSocketServer> ();
server->SetLocal (socketAddr);
wifiApNodes.Get (1)->AddApplication (server);
}
Config::Connect ("/NodeList/*/ApplicationList/*/$ns3::PacketSocketServer/Rx", MakeCallback (&SocketRx));
Simulator::Stop (Seconds (duration));
Simulator::Run ();
Simulator::Destroy ();
for (uint32_t i = 0; i < 2; i++)
{
double throughput = static_cast<double> (bytesReceived[2 + i]) * 8 / 1000 / 1000 / duration;
std::cout << "Throughput for BSS " << i + 1 << ": " << throughput << " Mbit/s" << std::endl;
}
return 0;
}
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