/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */ /* * Copyright (c) 2015 Sébastien Deronne * * 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: Sébastien Deronne */ #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 in order to show how 802.11n two-level aggregation feature works. // Two-level aggregation is the simultaneous use of MSDU and MPDU aggregation schemes (known as one-level aggregation techniques). // // The throughput is obtained for a given number of aggregated MSDUs and MPDUs. // The number of aggregated MSDUs and MPDUs can be chosen by the user through the nMsdus and nMpdus attibutes, respectively. // // Example: ./waf --run "simple-two-level-aggregation --nMsdus=3 --nMpdus=8" // // 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). // // Throughput gets higher as either nMsdus or nMpdus is increased (one-level aggregation), // or when both nMsdus and nMpdus are increases (two-level aggregation). // MSDU aggregation offers a better header reduction compare to MPDU aggregation, // while MPDU aggregation is more robust against transmission errors than MSDU aggregation. // The good setting of nMsdu and nMpdus will depends on various factors (payload size, channel conditions, ...). // Since this example considers an ideal channel, the highest throughput is obtained with the largest values for nMsdus and nMpdus parameters. // Users should nevertheless take care that the standard rules limit the maximum MSDU size to 7935 bytes and the MPDU size to 65535 bytes. // Consequently, more packets should be aggregated if their payload is small with standard-compliant parameters. // Users should also note that the maximum duration of the frame is limited by the standard. // As a result, higher values for nMsdus and nMpdus may not always provide throughput improvements. using namespace ns3; NS_LOG_COMPONENT_DEFINE ("SimpleTwoLevelAggregation"); int main (int argc, char *argv[]) { uint32_t payloadSize = 1472; //bytes uint64_t simulationTime = 10; //seconds uint32_t nMsdus = 1; uint32_t nMpdus = 1; bool enableRts = 0; CommandLine cmd; cmd.AddValue ("nMsdus", "Number of aggregated MSDUs", nMsdus); //number of aggregated MSDUs specified by the user cmd.AddValue ("nMpdus", "Number of aggregated MPDUs", nMpdus); //number of aggregated MPDUs specified by the user cmd.AddValue ("payloadSize", "Payload size in bytes", payloadSize); cmd.AddValue ("enableRts", "Enable RTS/CTS", enableRts); cmd.AddValue ("simulationTime", "Simulation time in seconds", simulationTime); cmd.Parse (argc, argv); if (!enableRts) { Config::SetDefault ("ns3::WifiRemoteStationManager::RtsCtsThreshold", StringValue ("999999")); } else { Config::SetDefault ("ns3::WifiRemoteStationManager::RtsCtsThreshold", StringValue ("0")); } Config::SetDefault ("ns3::WifiRemoteStationManager::FragmentationThreshold", StringValue ("990000")); NodeContainer wifiStaNode; wifiStaNode.Create (1); NodeContainer wifiApNode; wifiApNode.Create (1); YansWifiChannelHelper channel = YansWifiChannelHelper::Default (); YansWifiPhyHelper phy = YansWifiPhyHelper::Default (); phy.SetPcapDataLinkType (YansWifiPhyHelper::DLT_IEEE802_11_RADIO); phy.SetChannel (channel.Create ()); WifiHelper wifi = WifiHelper::Default (); wifi.SetStandard (WIFI_PHY_STANDARD_80211n_5GHZ); //We consider a constant bitrate since HT rate adaptation algorithms are not supported yet in the simulator wifi.SetRemoteStationManager ("ns3::ConstantRateWifiManager", "DataMode", StringValue ("HtMcs7"), "ControlMode", StringValue ("HtMcs0")); HtWifiMacHelper mac = HtWifiMacHelper::Default (); Ssid ssid = Ssid ("simple-two-level-aggregation"); mac.SetType ("ns3::StaWifiMac", "Ssid", SsidValue (ssid), "ActiveProbing", BooleanValue (false)); //Enable aggregation at the station side if (nMpdus > 1) { mac.SetBlockAckThresholdForAc (AC_BE, 2); //enable BlockAck when A-MPDU is used } if (nMsdus > 0) { mac.SetMpduAggregatorForAc (AC_BE,"ns3::MpduStandardAggregator", "MaxAmpduSize", UintegerValue (nMpdus * (nMsdus * (payloadSize + 100)))); //Set the maximum size for A-MPDU with regards to the payload size and the number of MSDUs expected in each MPDU. } else //MPDU aggregation only (one-level aggregation) { mac.SetMpduAggregatorForAc (AC_BE,"ns3::MpduStandardAggregator", "MaxAmpduSize", UintegerValue (nMpdus * (payloadSize + 200))); //Set the maximum size for A-MPDU with regards to the payload size } mac.SetMsduAggregatorForAc (AC_BE,"ns3::MsduStandardAggregator", "MaxAmsduSize", UintegerValue (nMsdus * (payloadSize + 100))); //Set the maximum size for A-MSDU with regards to the payload size NetDeviceContainer staDevice; staDevice = wifi.Install (phy, mac, wifiStaNode); mac.SetType ("ns3::ApWifiMac", "Ssid", SsidValue (ssid), "BeaconInterval", TimeValue (MicroSeconds (102400)), "BeaconGeneration", BooleanValue (true)); //Enable aggregation at the AP side if (nMpdus > 1) { mac.SetBlockAckThresholdForAc (AC_BE, 2); //enable BlockAck when A-MPDU is used } if (nMsdus > 0) { mac.SetMpduAggregatorForAc (AC_BE,"ns3::MpduStandardAggregator", "MaxAmpduSize", UintegerValue (nMpdus * (nMsdus * (payloadSize + 100)))); //Set the maximum size for A-MPDU according to the payload size and the number of MSDUs expected in each MPDU. } else //MPDU aggregation only (one-level aggregation) { mac.SetMpduAggregatorForAc (AC_BE,"ns3::MpduStandardAggregator", "MaxAmpduSize", UintegerValue (nMpdus * (payloadSize + 200))); //Set the maximum size for A-MPDU with regards to the payload size } mac.SetMsduAggregatorForAc (AC_BE,"ns3::MsduStandardAggregator", "MaxAmsduSize", UintegerValue (nMsdus * (payloadSize + 100))); //Set the maximum size for A-MSDU with regards to the payload size NetDeviceContainer apDevice; apDevice = wifi.Install (phy, mac, wifiApNode); /* Setting mobility model */ MobilityHelper mobility; Ptr positionAlloc = CreateObject (); 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 StaInterface; StaInterface = address.Assign (staDevice); Ipv4InterfaceContainer ApInterface; ApInterface = address.Assign (apDevice); /* Setting applications */ UdpServerHelper myServer (9); ApplicationContainer serverApp = myServer.Install (wifiStaNode.Get (0)); serverApp.Start (Seconds (0.0)); serverApp.Stop (Seconds (simulationTime + 1)); UdpClientHelper myClient (StaInterface.GetAddress (0), 9); myClient.SetAttribute ("MaxPackets", UintegerValue (4294967295u)); myClient.SetAttribute ("Interval", TimeValue (Time ("0.00002"))); //packets/s myClient.SetAttribute ("PacketSize", UintegerValue (payloadSize)); ApplicationContainer clientApp = myClient.Install (wifiApNode.Get (0)); clientApp.Start (Seconds (1.0)); clientApp.Stop (Seconds (simulationTime + 1)); Simulator::Stop (Seconds (simulationTime + 1)); Simulator::Run (); Simulator::Destroy (); uint32_t totalPacketsThrough = DynamicCast (serverApp.Get (0))->GetReceived (); double throughput = totalPacketsThrough * payloadSize * 8 / (simulationTime * 1000000.0); std::cout << "Throughput: " << throughput << " Mbit/s" << '\n'; return 0; }