/* -*-  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

 *

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

 */

/**

 * This is a simple example in order to show how 802.11n compressed block ack mechanism could be used.

 *

 * Network topology:

 * 

 *  Wifi 192.168.1.0

 * 

 *        AP

 *   *    *

 *   |    |

 *   n1   n2 

 *

 * In this example a QoS sta sends UDP datagram packets to access point. On the access point

 * there is no application installed so it replies to every packet with an ICMP frame. However

 * our attention is on originator sta n1. We have set blockAckThreshold (mininum number of packets to use

 * block ack) to 2 so if there are in the BestEffort queue more than 2 packets a block ack will be

 * negotiated. We also set a timeout for block ack inactivity to 3 blocks of 1024 microseconds. This timer is

 * reset when:

 *    - the originator receives a block ack frame.

 *    - the recipient receives a block ack request or a MPDU with ack policy Block Ack. 

 */

#include "ns3/core-module.h"

#include "ns3/simulator-module.h"

#include "ns3/node-module.h"

#include "ns3/helper-module.h"

#include "ns3/global-routing-module.h"

#include "ns3/wifi-module.h"

#include "ns3/mobility-module.h"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("Test-block-ack");

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

{

  LogComponentEnable ("EdcaTxopN", LOG_LEVEL_DEBUG);

  LogComponentEnable ("BlockAckManager", LOG_LEVEL_INFO);

  Ptr<Node> sta = CreateObject<Node> ();

  Ptr<Node> ap = CreateObject<Node> ();

  YansWifiChannelHelper channel = YansWifiChannelHelper::Default ();

  YansWifiPhyHelper phy = YansWifiPhyHelper::Default ();

  phy.SetChannel (channel.Create ());

  WifiHelper wifi = WifiHelper::Default ();

  QosWifiMacHelper mac = QosWifiMacHelper::Default ();

  /* disable fragmentation */

  wifi.SetRemoteStationManager ("ns3::AarfWifiManager", "FragmentationThreshold", UintegerValue (2500));

  Ssid ssid ("My-network");

  mac.SetType ("ns3::QstaWifiMac", "Ssid" , SsidValue (ssid), "ActiveProbing", BooleanValue (false));

  /* setting blockack threshold for sta's BE queue */

  mac.SetBlockAckThresholdForAc (AC_BE, 2);

  /* setting block inactivity timeout to 3*1024 = 3072 microseconds */ 

  //mac.SetBlockAckInactivityTimeoutForAc (AC_BE, 3);

  NetDeviceContainer staDevice = wifi.Install (phy, mac, sta);

  mac.SetType ("ns3::QapWifiMac", "Ssid", SsidValue (ssid));

  mac.SetBlockAckThresholdForAc (AC_BE, 0);

  NetDeviceContainer apDevice = wifi.Install (phy, mac, ap);

  /* Setting mobility model */

  MobilityHelper mobility;

  mobility.SetPositionAllocator ("ns3::GridPositionAllocator",

    "MinX", DoubleValue (0.0),

    "MinY", DoubleValue (0.0),

    "DeltaX", DoubleValue (5.0),

    "DeltaY", DoubleValue (10.0),

    "GridWidth", UintegerValue (3),

    "LayoutType", StringValue ("RowFirst"));

  mobility.SetMobilityModel ("ns3::RandomWalk2dMobilityModel",

    "Bounds", RectangleValue (Rectangle (-50, 50, -50, 50)));

  mobility.Install (sta);

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

  mobility.Install (ap);

  /* Internet stack*/

  InternetStackHelper stack;

  stack.Install (sta);

  stack.Install (ap);

  Ipv4AddressHelper address;

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

  Ipv4InterfaceContainer staIf;

  Ipv4InterfaceContainer apIf;

  staIf = address.Assign (staDevice);

  apIf = address.Assign (apDevice);

  /* Setting applications */

  uint16_t port = 9;

  DataRate dataRate ("1Mb/s");

  OnOffHelper onOff ("ns3::UdpSocketFactory", Address (InetSocketAddress (apIf.GetAddress (0), port)));

  onOff.SetAttribute ("DataRate", DataRateValue (dataRate));

  onOff.SetAttribute ("OnTime", RandomVariableValue (ConstantVariable (0.01)));

  onOff.SetAttribute ("OffTime", RandomVariableValue (ConstantVariable (8)));

  onOff.SetAttribute ("PacketSize", UintegerValue (50));

  ApplicationContainer staApps = onOff.Install (sta);

  staApps.Start (Seconds (1.0));

  staApps.Stop (Seconds (10.0));

  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

  Simulator::Stop (Seconds (10.0));

  phy.EnablePcap ("test-blockack-2", ap->GetId (), 0);

  Simulator::Run ();

  Simulator::Destroy ();

  return 0;

}