307 lines
12 KiB
C++
307 lines
12 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/*
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* Copyright (c) 2016 Sébastien Deronne
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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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#include "ns3/core-module.h"
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#include "ns3/network-module.h"
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#include "ns3/applications-module.h"
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#include "ns3/wifi-module.h"
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#include "ns3/mobility-module.h"
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#include "ns3/ipv4-global-routing-helper.h"
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#include "ns3/internet-module.h"
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// This example shows how the presence of an 802.11b station in an 802.11g network does affect the performance.
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//
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// The example compares different scenarios depending on whether an 802.11b station is associated to the access point
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// and depending on the configuration of the following parameters:
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// - protection mode that is configured on the AP;
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// - whether short PLCP is supported by the 802.11b station;
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// - whether short slot time is supported by both the 802.11g station and the AP.
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//
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// The output results show that the presence of an 802.11b station strongly affects 802.11g performance.
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// Protection mechanisms ensure that the NAV value of 802.11b stations is set correctly in case of 802.11g transmissions.
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// In practice, those protection mechanism add a lot of overhead, resulting in reduced performance. CTS-To-Self introduces
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// less overhead than Rts-Cts, but is not heard by hidden stations (and is thus generally only recommended as a protection
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// mechanism for access points). Since short slot time is disabled once an 802.11b station enters the network, benefits from
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// short slot time are only observed in a pure-G configuration.
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//
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// The user can also select the payload size and can choose either an UDP or a TCP connection.
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// Example: ./waf --run "mixed-bg-network --isUdp=1"
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//
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// Network topology:
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//
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// STA (802.11b) AP (802.11b/g) STA (802.11b/g)
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// * * *
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// | | |
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// n1 n2 n3
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using namespace ns3;
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NS_LOG_COMPONENT_DEFINE ("ErpAndNonErp");
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class Experiment
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{
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public:
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Experiment ();
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double Run (bool enableProtection, bool enableShortSlotTime, bool enableShortPlcpPreamble, bool isMixed, bool isUdp, uint32_t payloadSize, uint32_t simulationTime);
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};
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Experiment::Experiment ()
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{
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}
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double
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Experiment::Run (bool enableProtection, bool enableShortSlotTime, bool enableShortPlcpPreamble, bool isMixed, bool isUdp, uint32_t payloadSize, uint32_t simulationTime)
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{
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double throughput = 0;
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uint32_t totalPacketsThrough = 0;
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uint32_t nWifiB = 0;
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if (isMixed)
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{
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nWifiB = 1;
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}
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NodeContainer wifiBStaNodes;
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wifiBStaNodes.Create (nWifiB);
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NodeContainer wifiGStaNodes;
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wifiGStaNodes.Create (1);
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NodeContainer wifiApNode;
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wifiApNode.Create (1);
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YansWifiChannelHelper channel = YansWifiChannelHelper::Default ();
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channel.AddPropagationLoss ("ns3::RangePropagationLossModel");
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YansWifiPhyHelper phy = YansWifiPhyHelper::Default ();
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phy.SetPcapDataLinkType (YansWifiPhyHelper::DLT_IEEE802_11_RADIO);
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phy.SetChannel (channel.Create ());
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WifiHelper wifi;
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wifi.SetRemoteStationManager ("ns3::IdealWifiManager");
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// 802.11b STA
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wifi.SetStandard (WIFI_PHY_STANDARD_80211b);
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WifiMacHelper mac;
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Ssid ssid = Ssid ("ns-3-ssid");
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mac.SetType ("ns3::StaWifiMac",
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"Ssid", SsidValue (ssid),
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"ActiveProbing", BooleanValue (false),
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"ShortSlotTimeSupported", BooleanValue (enableShortSlotTime));
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// Configure the PLCP preamble type: long or short
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phy.Set ("ShortPlcpPreambleSupported", BooleanValue (enableShortPlcpPreamble));
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NetDeviceContainer bStaDevice;
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bStaDevice = wifi.Install (phy, mac, wifiBStaNodes);
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// 802.11b/g STA
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wifi.SetStandard (WIFI_PHY_STANDARD_80211g);
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NetDeviceContainer gStaDevice;
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gStaDevice = wifi.Install (phy, mac, wifiGStaNodes);
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// 802.11b/g AP
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mac.SetType ("ns3::ApWifiMac",
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"Ssid", SsidValue (ssid),
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"BeaconGeneration", BooleanValue (true),
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"EnableNonErpProtection", BooleanValue (enableProtection),
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"ShortSlotTimeSupported", BooleanValue (enableShortSlotTime));
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NetDeviceContainer apDevice;
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apDevice = wifi.Install (phy, mac, wifiApNode);
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// Setting mobility model
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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));
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if (isMixed)
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{
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positionAlloc->Add (Vector (5.0, 0.0, 0.0));
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}
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positionAlloc->Add (Vector (0.0, 5.0, 0.0));
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mobility.SetPositionAllocator (positionAlloc);
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mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
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mobility.Install (wifiApNode);
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mobility.Install (wifiBStaNodes);
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mobility.Install (wifiGStaNodes);
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// Internet stack
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InternetStackHelper stack;
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stack.Install (wifiApNode);
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stack.Install (wifiBStaNodes);
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stack.Install (wifiGStaNodes);
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Ipv4AddressHelper address;
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address.SetBase ("192.168.1.0", "255.255.255.0");
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Ipv4InterfaceContainer bStaInterface;
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bStaInterface = address.Assign (bStaDevice);
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Ipv4InterfaceContainer gStaInterface;
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gStaInterface = address.Assign (gStaDevice);
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Ipv4InterfaceContainer ApInterface;
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ApInterface = address.Assign (apDevice);
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// Setting applications
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if (isUdp)
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{
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UdpServerHelper myServer (9);
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ApplicationContainer serverApp = myServer.Install (wifiApNode);
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serverApp.Start (Seconds (0.0));
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serverApp.Stop (Seconds (simulationTime + 1));
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UdpClientHelper myClient (ApInterface.GetAddress (0), 9);
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myClient.SetAttribute ("MaxPackets", UintegerValue (4294967295u));
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myClient.SetAttribute ("Interval", TimeValue (Time ("0.0002"))); //packets/s
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myClient.SetAttribute ("PacketSize", UintegerValue (payloadSize));
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ApplicationContainer clientApp = myClient.Install (wifiGStaNodes);
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clientApp.Start (Seconds (1.0));
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clientApp.Stop (Seconds (simulationTime + 1));
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Simulator::Stop (Seconds (simulationTime + 1));
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Simulator::Run ();
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Simulator::Destroy ();
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totalPacketsThrough = DynamicCast<UdpServer> (serverApp.Get (0))->GetReceived ();
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throughput = totalPacketsThrough * payloadSize * 8 / (simulationTime * 1000000.0);
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}
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else
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{
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uint16_t port = 50000;
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Address apLocalAddress (InetSocketAddress (Ipv4Address::GetAny (), port));
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PacketSinkHelper packetSinkHelper ("ns3::TcpSocketFactory", apLocalAddress);
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ApplicationContainer sinkApp = packetSinkHelper.Install (wifiApNode.Get (0));
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sinkApp.Start (Seconds (0.0));
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sinkApp.Stop (Seconds (simulationTime + 1));
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OnOffHelper onoff ("ns3::TcpSocketFactory",Ipv4Address::GetAny ());
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onoff.SetAttribute ("OnTime", StringValue ("ns3::ConstantRandomVariable[Constant=1]"));
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onoff.SetAttribute ("OffTime", StringValue ("ns3::ConstantRandomVariable[Constant=0]"));
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onoff.SetAttribute ("PacketSize", UintegerValue (payloadSize));
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onoff.SetAttribute ("DataRate", DataRateValue (54000000)); //bit/s
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AddressValue remoteAddress (InetSocketAddress (ApInterface.GetAddress (0), port));
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onoff.SetAttribute ("Remote", remoteAddress);
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ApplicationContainer apps;
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apps.Add (onoff.Install (wifiGStaNodes));
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apps.Start (Seconds (1.0));
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apps.Stop (Seconds (simulationTime + 1));
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Simulator::Stop (Seconds (simulationTime + 1));
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Simulator::Run ();
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Simulator::Destroy ();
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totalPacketsThrough = DynamicCast<PacketSink> (sinkApp.Get (0))->GetTotalRx ();
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throughput += totalPacketsThrough * 8 / (simulationTime * 1000000.0);
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}
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return throughput;
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}
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int main (int argc, char *argv[])
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{
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uint32_t payloadSize = 1472; //bytes
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uint32_t simulationTime = 10; //seconds
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bool isUdp = true;
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CommandLine cmd;
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cmd.AddValue ("payloadSize", "Payload size in bytes", payloadSize);
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cmd.AddValue ("simulationTime", "Simulation time in seconds", simulationTime);
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cmd.AddValue ("isUdp", "UDP if set to 1, TCP otherwise", isUdp);
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cmd.Parse (argc, argv);
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Experiment experiment;
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double throughput = 0;
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std::cout << "Protection mode" << "\t\t" << "Slot time supported" << "\t\t" << "PLCP preamble supported" << "\t\t" << "Scenario" << "\t" << "Throughput" << std::endl;
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throughput = experiment.Run (false, false, false, false, isUdp, payloadSize, simulationTime);
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if (throughput < 23 || throughput > 24)
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{
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NS_LOG_ERROR ("Obtained throughput " << throughput << " is not in the expected boundaries!");
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exit (1);
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}
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std::cout << "Disabled" << "\t\t" << "Long" << "\t\t\t\t" << "Long" << "\t\t\t\t" << "G-only" << "\t\t" << throughput <<" Mbit/s" << std::endl;
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throughput = experiment.Run (false, true, false, false, isUdp, payloadSize, simulationTime);
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if (throughput < 29 || throughput > 30)
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{
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NS_LOG_ERROR ("Obtained throughput " << throughput << " is not in the expected boundaries!");
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exit (1);
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}
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std::cout << "Disabled" << "\t\t" << "Short" << "\t\t\t\t" << "Long" << "\t\t\t\t" << "G-only" << "\t\t" << throughput <<" Mbit/s" << std::endl;
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throughput = experiment.Run (false, false, false, true, isUdp, payloadSize, simulationTime);
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if (throughput < 23 || throughput > 24)
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{
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NS_LOG_ERROR ("Obtained throughput " << throughput << " is not in the expected boundaries!");
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exit (1);
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}
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std::cout << "Disabled" << "\t\t" << "Long" << "\t\t\t\t" << "Long" << "\t\t\t\t" << "Mixed" << "\t\t" << throughput <<" Mbit/s" << std::endl;
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throughput = experiment.Run (false, false, true, true, isUdp, payloadSize, simulationTime);
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if (throughput < 23 || throughput > 24)
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{
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NS_LOG_ERROR ("Obtained throughput " << throughput << " is not in the expected boundaries!");
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exit (1);
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}
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std::cout << "Disabled" << "\t\t" << "Long" << "\t\t\t\t" << "Short" << "\t\t\t\t" << "Mixed" << "\t\t" << throughput <<" Mbit/s" << std::endl;
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Config::SetDefault ("ns3::WifiRemoteStationManager::ProtectionMode", StringValue ("Rts-Cts"));
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throughput = experiment.Run (true, false, false, true, isUdp, payloadSize, simulationTime);
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if (throughput < 19 || throughput > 20)
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{
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NS_LOG_ERROR ("Obtained throughput " << throughput << " is not in the expected boundaries!");
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exit (1);
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}
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std::cout << "RTS/CTS" << "\t\t\t" << "Long" << "\t\t\t\t" << "Long" << "\t\t\t\t" << "Mixed" << "\t\t" << throughput <<" Mbit/s" << std::endl;
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throughput = experiment.Run (true, false, true, true, isUdp, payloadSize, simulationTime);
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if (throughput < 19 || throughput > 20)
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{
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NS_LOG_ERROR ("Obtained throughput " << throughput << " is not in the expected boundaries!");
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exit (1);
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}
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std::cout << "RTS/CTS" << "\t\t\t" << "Long" << "\t\t\t\t" << "Short" << "\t\t\t\t" << "Mixed" << "\t\t" << throughput <<" Mbit/s" << std::endl;
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Config::SetDefault ("ns3::WifiRemoteStationManager::ProtectionMode", StringValue ("Cts-To-Self"));
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throughput = experiment.Run (true, false, false, true, isUdp, payloadSize, simulationTime);
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if (throughput < 21 || throughput > 22)
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{
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NS_LOG_ERROR ("Obtained throughput " << throughput << " is not in the expected boundaries!");
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exit (1);
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}
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std::cout << "CTS-TO-SELF" << "\t\t" << "Long" << "\t\t\t\t" << "Long" << "\t\t\t\t" << "Mixed" << "\t\t" << throughput <<" Mbit/s" << std::endl;
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throughput = experiment.Run (true, false, true, true, isUdp, payloadSize, simulationTime);
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if (throughput < 21 || throughput > 22)
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{
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NS_LOG_ERROR ("Obtained throughput " << throughput << " is not in the expected boundaries!");
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exit (1);
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}
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std::cout << "CTS-TO-SELF" << "\t\t" << "Long" << "\t\t\t\t" << "Short" << "\t\t\t\t" << "Mixed" << "\t\t" << throughput <<" Mbit/s" << std::endl;
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return 0;
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}
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