/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2009 MIRKO BANCHI

 *

 * 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: Mirko Banchi <mk.banchi@gmail.com>

 *          Sebastien Deronne <sebastien.deronne@gmail.com>

 */

#include "ns3/core-module.h"

#include "ns3/network-module.h"

#include "ns3/applications-module.h"

#include "ns3/wifi-module.h"

#include "ns3/mobility-module.h"

#include "ns3/ipv4-global-routing-helper.h"

#include "ns3/internet-module.h"

//This is a simple example of an IEEE 802.11n Wi-Fi network.

//

//Network topology:

//

//  Wifi 192.168.1.0

//

//         AP

//    *    *

//    |    |

//    n1   n2

//

//Packets in this simulation aren't marked with a QosTag so they are considered

//belonging to BestEffort Access Class (AC_BE).

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("ht-wifi-network");

int main (int argc, char *argv[])

{

  bool udp = true;

  double simulationTime = 10; //seconds

  CommandLine cmd;

  cmd.AddValue ("simulationTime", "Simulation time in seconds", simulationTime);

  cmd.AddValue ("udp", "UDP if set to 1, TCP otherwise", udp);

  cmd.Parse (argc,argv);

  std::cout << "MCS value" << "\t\t" << "Channel width" << "\t\t" << "short GI" << "\t\t" << "Throughput" << '\n';

  for (int i = 0; i <= 7; i++) //MCS

    {

      for (int j = 20; j <= 40; ) //channel width

        {

          for (int k = 0; k < 2; k++) //GI: 0 and 1

            {

              uint32_t payloadSize; //1500 byte IP packet

              if (udp)

                {

                  payloadSize = 1472; //bytes

                }

              else

                {

                  payloadSize = 1448; //bytes

                  Config::SetDefault ("ns3::TcpSocket::SegmentSize", UintegerValue (payloadSize));

                }

              NodeContainer wifiStaNode;

              wifiStaNode.Create (1);

              NodeContainer wifiApNode;

              wifiApNode.Create (1);

              YansWifiChannelHelper channel = YansWifiChannelHelper::Default ();

              YansWifiPhyHelper phy = YansWifiPhyHelper::Default ();

              phy.SetChannel (channel.Create ());

              // Set guard interval

              phy.Set ("ShortGuardEnabled", BooleanValue (k));

              WifiHelper wifi = WifiHelper::Default ();

              wifi.SetStandard (WIFI_PHY_STANDARD_80211n_5GHZ);

              HtWifiMacHelper mac = HtWifiMacHelper::Default ();

              wifi.SetRemoteStationManager ("ns3::ConstantRateWifiManager","DataMode", DataRate,

                                            "ControlMode", DataRate);

              mac.SetType ("ns3::StaWifiMac",

                           "Ssid", SsidValue (ssid),

                           "ActiveProbing", BooleanValue (false));

              NetDeviceContainer staDevice;

              staDevice = wifi.Install (phy, mac, wifiStaNode);

              mac.SetType ("ns3::ApWifiMac",

                           "Ssid", SsidValue (ssid));

              NetDeviceContainer apDevice;

              apDevice = wifi.Install (phy, mac, wifiApNode);

              // Set channel width

              Config::Set ("/NodeList/*/DeviceList/*/$ns3::WifiNetDevice/Phy/ChannelWidth", UintegerValue (j));

              // mobility.

              MobilityHelper mobility;

              Ptr<ListPositionAllocator> positionAlloc = CreateObject<ListPositionAllocator> ();

              positionAlloc->Add (Vector (0.0, 0.0, 0.0));

              positionAlloc->Add (Vector (1.0, 0.0, 0.0));

              mobility.SetPositionAllocator (positionAlloc);

              mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");

              mobility.Install (wifiApNode);

              mobility.Install (wifiStaNode);

              /* Internet stack*/

              InternetStackHelper stack;

              stack.Install (wifiApNode);

              stack.Install (wifiStaNode);

              Ipv4AddressHelper address;

              address.SetBase ("192.168.1.0", "255.255.255.0");

              Ipv4InterfaceContainer staNodeInterface;

              Ipv4InterfaceContainer apNodeInterface;

              staNodeInterface = address.Assign (staDevice);

              apNodeInterface = address.Assign (apDevice);

              /* Setting applications */

              ApplicationContainer serverApp, sinkApp;

              if (udp)

                {

                  //UDP flow

                  UdpServerHelper myServer (9);

                  serverApp = myServer.Install (wifiStaNode.Get (0));

                  serverApp.Start (Seconds (0.0));

                  serverApp.Stop (Seconds (simulationTime + 1));

                  UdpClientHelper myClient (staNodeInterface.GetAddress (0), 9);

                  myClient.SetAttribute ("MaxPackets", UintegerValue (4294967295u));

                  myClient.SetAttribute ("Interval", TimeValue (Time ("0.00001"))); //packets/s

                  myClient.SetAttribute ("PacketSize", UintegerValue (payloadSize));

                  ApplicationContainer clientApp = myClient.Install (wifiApNode.Get (0));

                  clientApp.Start (Seconds (1.0));

                  clientApp.Stop (Seconds (simulationTime + 1));

                }

              else

                {

                  //TCP flow

                  uint16_t port = 50000;

                  Address apLocalAddress (InetSocketAddress (Ipv4Address::GetAny (), port));

                  PacketSinkHelper packetSinkHelper ("ns3::TcpSocketFactory", apLocalAddress);

                  sinkApp = packetSinkHelper.Install (wifiStaNode.Get (0));

                  sinkApp.Start (Seconds (0.0));

                  sinkApp.Stop (Seconds (simulationTime + 1));

                  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 (1000000000)); //bit/s

                  ApplicationContainer apps;

                  AddressValue remoteAddress (InetSocketAddress (staNodeInterface.GetAddress (0), port));

                  onoff.SetAttribute ("Remote", remoteAddress);

                  apps.Add (onoff.Install (wifiApNode.Get (0)));

                  apps.Start (Seconds (1.0));

                  apps.Stop (Seconds (simulationTime + 1));

                }

              Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

              Simulator::Stop (Seconds (simulationTime + 1));

              Simulator::Run ();

              Simulator::Destroy ();

              double throughput = 0;

              if (udp)

                {

                  //UDP

                  uint32_t totalPacketsThrough = DynamicCast<UdpServer> (serverApp.Get (0))->GetReceived ();

                  throughput = totalPacketsThrough * payloadSize * 8 / (simulationTime * 1000000.0); //Mbit/s

                }

              else

                {

                  //TCP

                  uint32_t totalPacketsThrough = DynamicCast<PacketSink> (sinkApp.Get (0))->GetTotalRx ();

                  throughput = totalPacketsThrough * 8 / (simulationTime * 1000000.0); //Mbit/s

                }

            }

          j *= 2;

        }

    }

  return 0;

}