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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2010 IITP RAS
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation;
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Authors: Pavel Boyko <boyko@iitp.ru>
*/
/*
* Classical hidden terminal problem and its RTS/CTS solution.
*
* Topology: [node 0] <-- -50 dB --> [node 1] <-- -50 dB --> [node 2]
*
* This example illustrates the use of
* - Wifi in ad-hoc mode
* - Matrix propagation loss model
* - Use of OnOffApplication to generate CBR stream
* - IP flow monitor
*/
#include "ns3/core-module.h"
#include "ns3/propagation-module.h"
#include "ns3/network-module.h"
#include "ns3/applications-module.h"
#include "ns3/mobility-module.h"
#include "ns3/internet-module.h"
#include "ns3/flow-monitor-module.h"
#include "ns3/wifi-module.h"
using namespace ns3;
/// Run single 10 seconds experiment with enabled or disabled RTS/CTS mechanism
void experiment (bool enableCtsRts)
{
// 0. Enable or disable CTS/RTS
UintegerValue ctsThr = (enableCtsRts ? UintegerValue (100) : UintegerValue (2200));
Config::SetDefault ("ns3::WifiRemoteStationManager::RtsCtsThreshold", ctsThr);
// 1. Create 3 nodes
NodeContainer nodes;
nodes.Create (3);
// 2. Place nodes somehow, this is required by every wireless simulation
for (size_t i = 0; i < 3; ++i)
{
nodes.Get (i)->AggregateObject (CreateObject<ConstantPositionMobilityModel> ());
}
// 3. Create propagation loss matrix
Ptr<MatrixPropagationLossModel> lossModel = CreateObject<MatrixPropagationLossModel> ();
lossModel->SetDefaultLoss (200); // set default loss to 200 dB (no link)
lossModel->SetLoss (nodes.Get (0)->GetObject<MobilityModel>(), nodes.Get (1)->GetObject<MobilityModel>(), 50); // set symmetric loss 0 <-> 1 to 50 dB
lossModel->SetLoss (nodes.Get (2)->GetObject<MobilityModel>(), nodes.Get (1)->GetObject<MobilityModel>(), 50); // set symmetric loss 2 <-> 1 to 50 dB
// 4. Create & setup wifi channel
Ptr<YansWifiChannel> wifiChannel = CreateObject <YansWifiChannel> ();
wifiChannel->SetPropagationLossModel (lossModel);
wifiChannel->SetPropagationDelayModel (CreateObject <ConstantSpeedPropagationDelayModel> ());
// 5. Install wireless devices
WifiHelper wifi;
wifi.SetStandard (WIFI_PHY_STANDARD_80211b);
wifi.SetRemoteStationManager ("ns3::ConstantRateWifiManager",
"DataMode",StringValue ("DsssRate2Mbps"),
"ControlMode",StringValue ("DsssRate1Mbps"));
YansWifiPhyHelper wifiPhy = YansWifiPhyHelper::Default ();
wifiPhy.SetChannel (wifiChannel);
WifiMacHelper wifiMac;
wifiMac.SetType ("ns3::AdhocWifiMac"); // use ad-hoc MAC
NetDeviceContainer devices = wifi.Install (wifiPhy, wifiMac, nodes);
// uncomment the following to have athstats output
// AthstatsHelper athstats;
// athstats.EnableAthstats(enableCtsRts ? "rtscts-athstats-node" : "basic-athstats-node" , nodes);
// uncomment the following to have pcap output
// wifiPhy.EnablePcap (enableCtsRts ? "rtscts-pcap-node" : "basic-pcap-node" , nodes);
// 6. Install TCP/IP stack & assign IP addresses
InternetStackHelper internet;
internet.Install (nodes);
Ipv4AddressHelper ipv4;
ipv4.SetBase ("10.0.0.0", "255.0.0.0");
ipv4.Assign (devices);
// 7. Install applications: two CBR streams each saturating the channel
ApplicationContainer cbrApps;
uint16_t cbrPort = 12345;
OnOffHelper onOffHelper ("ns3::UdpSocketFactory", InetSocketAddress (Ipv4Address ("10.0.0.2"), cbrPort));
onOffHelper.SetAttribute ("PacketSize", UintegerValue (1400));
onOffHelper.SetAttribute ("OnTime", StringValue ("ns3::ConstantRandomVariable[Constant=1]"));
onOffHelper.SetAttribute ("OffTime", StringValue ("ns3::ConstantRandomVariable[Constant=0]"));
// flow 1: node 0 -> node 1
onOffHelper.SetAttribute ("DataRate", StringValue ("3000000bps"));
onOffHelper.SetAttribute ("StartTime", TimeValue (Seconds (1.000000)));
cbrApps.Add (onOffHelper.Install (nodes.Get (0)));
// flow 2: node 2 -> node 1
/** \internal
* The slightly different start times and data rates are a workaround
* for \bugid{388} and \bugid{912}
*/
onOffHelper.SetAttribute ("DataRate", StringValue ("3001100bps"));
onOffHelper.SetAttribute ("StartTime", TimeValue (Seconds (1.001)));
cbrApps.Add (onOffHelper.Install (nodes.Get (2)));
/** \internal
* We also use separate UDP applications that will send a single
* packet before the CBR flows start.
* This is a workaround for the lack of perfect ARP, see \bugid{187}
*/
uint16_t echoPort = 9;
UdpEchoClientHelper echoClientHelper (Ipv4Address ("10.0.0.2"), echoPort);
echoClientHelper.SetAttribute ("MaxPackets", UintegerValue (1));
echoClientHelper.SetAttribute ("Interval", TimeValue (Seconds (0.1)));
echoClientHelper.SetAttribute ("PacketSize", UintegerValue (10));
ApplicationContainer pingApps;
// again using different start times to workaround Bug 388 and Bug 912
echoClientHelper.SetAttribute ("StartTime", TimeValue (Seconds (0.001)));
pingApps.Add (echoClientHelper.Install (nodes.Get (0)));
echoClientHelper.SetAttribute ("StartTime", TimeValue (Seconds (0.006)));
pingApps.Add (echoClientHelper.Install (nodes.Get (2)));
// 8. Install FlowMonitor on all nodes
FlowMonitorHelper flowmon;
Ptr<FlowMonitor> monitor = flowmon.InstallAll ();
// 9. Run simulation for 10 seconds
Simulator::Stop (Seconds (10));
Simulator::Run ();
// 10. Print per flow statistics
monitor->CheckForLostPackets ();
Ptr<Ipv4FlowClassifier> classifier = DynamicCast<Ipv4FlowClassifier> (flowmon.GetClassifier ());
FlowMonitor::FlowStatsContainer stats = monitor->GetFlowStats ();
for (std::map<FlowId, FlowMonitor::FlowStats>::const_iterator i = stats.begin (); i != stats.end (); ++i)
{
// first 2 FlowIds are for ECHO apps, we don't want to display them
//
// Duration for throughput measurement is 9.0 seconds, since
// StartTime of the OnOffApplication is at about "second 1"
// and
// Simulator::Stops at "second 10".
if (i->first > 2)
{
Ipv4FlowClassifier::FiveTuple t = classifier->FindFlow (i->first);
std::cout << "Flow " << i->first - 2 << " (" << t.sourceAddress << " -> " << t.destinationAddress << ")\n";
std::cout << " Tx Packets: " << i->second.txPackets << "\n";
std::cout << " Tx Bytes: " << i->second.txBytes << "\n";
std::cout << " TxOffered: " << i->second.txBytes * 8.0 / 9.0 / 1000 / 1000 << " Mbps\n";
std::cout << " Rx Packets: " << i->second.rxPackets << "\n";
std::cout << " Rx Bytes: " << i->second.rxBytes << "\n";
std::cout << " Throughput: " << i->second.rxBytes * 8.0 / 9.0 / 1000 / 1000 << " Mbps\n";
}
}
// 11. Cleanup
Simulator::Destroy ();
}
int main (int argc, char **argv)
{
CommandLine cmd;
cmd.Parse (argc, argv);
std::cout << "Hidden station experiment with RTS/CTS disabled:\n" << std::flush;
experiment (false);
std::cout << "------------------------------------------------\n";
std::cout << "Hidden station experiment with RTS/CTS enabled:\n";
experiment (true);
return 0;
}
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