256 lines
9.6 KiB
C++
256 lines
9.6 KiB
C++
/*
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* Copyright (c) 2009 The Boeing Company
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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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*/
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// This script configures two nodes on an 802.11b physical layer, with
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// 802.11b NICs in infrastructure mode, and by default, the station sends
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// one packet of 1000 (application) bytes to the access point. Unlike
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// the default physical layer configuration in which the path loss increases
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// (and the received signal strength decreases) as the distance between the
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// nodes increases, this example uses an artificial path loss model that
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// allows the configuration of the received signal strength (RSS) regardless
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// of other transmitter parameters (such as transmit power) or distance.
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// Therefore, changing position of the nodes has no effect.
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//
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// There are a number of command-line options available to control
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// the default behavior. The list of available command-line options
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// can be listed with the following command:
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// ./ns3 run "wifi-simple-infra --help"
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// Additional command-line options are available via the generic attribute
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// configuration system.
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//
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// For instance, for the default configuration, the physical layer will
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// stop successfully receiving packets when rss drops to -82 dBm or below.
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// To see this effect, try running:
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//
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// ./ns3 run "wifi-simple-infra --rss=-80 --numPackets=20"
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// ./ns3 run "wifi-simple-infra --rss=-81 --numPackets=20"
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// ./ns3 run "wifi-simple-infra --rss=-82 --numPackets=20"
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//
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// The last command (and any RSS value lower than this) results in no
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// packets received. This is due to the preamble detection model that
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// dominates the reception performance. By default, the
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// ThresholdPreambleDetectionModel is added to all WifiPhy objects, and this
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// model prevents reception unless the incoming signal has a RSS above its
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// 'MinimumRssi' value (default of -82 dBm) and has a SNR above the
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// 'Threshold' value (default of 4).
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//
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// If we relax these values, we can instead observe that signal reception
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// due to the 802.11b error model alone is much lower. For instance,
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// setting the MinimumRssi to -101 (around the thermal noise floor).
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// and the SNR Threshold to -10 dB, shows that the DsssErrorRateModel can
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// successfully decode at RSS values of -97 or -98 dBm.
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//
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// ./ns3 run "wifi-simple-infra --rss=-97 --numPackets=20
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// --ns3::ThresholdPreambleDetectionModel::Threshold=-10
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// --ns3::ThresholdPreambleDetectionModel::MinimumRssi=-101"
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// ./ns3 run "wifi-simple-infra --rss=-98 --numPackets=20
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// --ns3::ThresholdPreambleDetectionModel::Threshold=-10
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// --ns3::ThresholdPreambleDetectionModel::MinimumRssi=-101"
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// ./ns3 run "wifi-simple-infra --rss=-99 --numPackets=20
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// --ns3::ThresholdPreambleDetectionModel::Threshold=-10
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// --ns3::ThresholdPreambleDetectionModel::MinimumRssi=-101"
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//
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// Note that all ns-3 attributes (not just the ones exposed in the below
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// script) can be changed at command line; see the documentation.
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//
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// This script can also be helpful to put the Wifi layer into verbose
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// logging mode; this command will turn on all wifi logging:
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//
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// ./ns3 run "wifi-simple-infra --verbose=1"
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//
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// When you are done, you will notice two pcap trace files in your directory.
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// If you have tcpdump installed, you can try this:
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//
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// tcpdump -r wifi-simple-infra-0-0.pcap -nn -tt
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//
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#include "ns3/command-line.h"
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#include "ns3/config.h"
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#include "ns3/double.h"
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#include "ns3/internet-stack-helper.h"
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#include "ns3/ipv4-address-helper.h"
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#include "ns3/log.h"
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#include "ns3/mobility-helper.h"
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#include "ns3/mobility-model.h"
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#include "ns3/ssid.h"
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#include "ns3/string.h"
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#include "ns3/yans-wifi-channel.h"
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#include "ns3/yans-wifi-helper.h"
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using namespace ns3;
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NS_LOG_COMPONENT_DEFINE("WifiSimpleInfra");
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/**
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* Function called when a packet is received.
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*
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* \param socket The receiving socket.
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*/
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void
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ReceivePacket(Ptr<Socket> socket)
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{
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while (socket->Recv())
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{
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std::cout << "Received one packet!" << std::endl;
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}
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}
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/**
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* Generate traffic.
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*
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* \param socket The sending socket.
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* \param pktSize The packet size.
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* \param pktCount The packet count.
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* \param pktInterval The interval between two packets.
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*/
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static void
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GenerateTraffic(Ptr<Socket> socket, uint32_t pktSize, uint32_t pktCount, Time pktInterval)
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{
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if (pktCount > 0)
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{
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NS_LOG_INFO("Generating one packet of size " << pktSize);
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socket->Send(Create<Packet>(pktSize));
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Simulator::Schedule(pktInterval,
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&GenerateTraffic,
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socket,
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pktSize,
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pktCount - 1,
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pktInterval);
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}
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else
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{
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socket->Close();
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}
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}
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int
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main(int argc, char* argv[])
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{
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std::string phyMode("DsssRate1Mbps");
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double rss = -80; // -dBm
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uint32_t packetSize = 1000; // bytes
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uint32_t numPackets = 1;
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Time interval = Seconds(1.0);
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bool verbose = false;
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CommandLine cmd(__FILE__);
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cmd.AddValue("phyMode", "Wifi Phy mode", phyMode);
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cmd.AddValue("rss", "received signal strength", rss);
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cmd.AddValue("packetSize", "size of application packet sent", packetSize);
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cmd.AddValue("numPackets", "number of packets generated", numPackets);
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cmd.AddValue("interval", "interval between packets", interval);
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cmd.AddValue("verbose", "turn on all WifiNetDevice log components", verbose);
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cmd.Parse(argc, argv);
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// Fix non-unicast data rate to be the same as that of unicast
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Config::SetDefault("ns3::WifiRemoteStationManager::NonUnicastMode", StringValue(phyMode));
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NodeContainer c;
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c.Create(2);
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// The below set of helpers will help us to put together the wifi NICs we want
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WifiHelper wifi;
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if (verbose)
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{
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WifiHelper::EnableLogComponents(); // Turn on all Wifi logging
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}
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wifi.SetStandard(WIFI_STANDARD_80211b);
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YansWifiPhyHelper wifiPhy;
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// This is one parameter that matters when using FixedRssLossModel
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// set it to zero; otherwise, gain will be added
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wifiPhy.Set("RxGain", DoubleValue(0));
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// ns-3 supports RadioTap and Prism tracing extensions for 802.11b
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wifiPhy.SetPcapDataLinkType(WifiPhyHelper::DLT_IEEE802_11_RADIO);
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YansWifiChannelHelper wifiChannel;
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wifiChannel.SetPropagationDelay("ns3::ConstantSpeedPropagationDelayModel");
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// The below FixedRssLossModel will cause the rss to be fixed regardless
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// of the distance between the two stations, and the transmit power
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wifiChannel.AddPropagationLoss("ns3::FixedRssLossModel", "Rss", DoubleValue(rss));
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wifiPhy.SetChannel(wifiChannel.Create());
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// Add a mac and disable rate control
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WifiMacHelper wifiMac;
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wifi.SetRemoteStationManager("ns3::ConstantRateWifiManager",
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"DataMode",
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StringValue(phyMode),
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"ControlMode",
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StringValue(phyMode));
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// Setup the rest of the MAC
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Ssid ssid = Ssid("wifi-default");
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// setup STA
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wifiMac.SetType("ns3::StaWifiMac", "Ssid", SsidValue(ssid));
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NetDeviceContainer staDevice = wifi.Install(wifiPhy, wifiMac, c.Get(0));
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NetDeviceContainer devices = staDevice;
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// setup AP
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wifiMac.SetType("ns3::ApWifiMac", "Ssid", SsidValue(ssid));
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NetDeviceContainer apDevice = wifi.Install(wifiPhy, wifiMac, c.Get(1));
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devices.Add(apDevice);
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// Note that with FixedRssLossModel, the positions below are not
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// used for received signal strength.
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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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positionAlloc->Add(Vector(5.0, 0.0, 0.0));
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mobility.SetPositionAllocator(positionAlloc);
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mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
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mobility.Install(c);
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InternetStackHelper internet;
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internet.Install(c);
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Ipv4AddressHelper ipv4;
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ipv4.SetBase("10.1.1.0", "255.255.255.0");
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Ipv4InterfaceContainer i = ipv4.Assign(devices);
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TypeId tid = TypeId::LookupByName("ns3::UdpSocketFactory");
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Ptr<Socket> recvSink = Socket::CreateSocket(c.Get(0), tid);
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InetSocketAddress local = InetSocketAddress(Ipv4Address::GetAny(), 80);
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recvSink->Bind(local);
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recvSink->SetRecvCallback(MakeCallback(&ReceivePacket));
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Ptr<Socket> source = Socket::CreateSocket(c.Get(1), tid);
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InetSocketAddress remote = InetSocketAddress(Ipv4Address("255.255.255.255"), 80);
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source->SetAllowBroadcast(true);
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source->Connect(remote);
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// Tracing
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wifiPhy.EnablePcap("wifi-simple-infra", devices);
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// Output what we are doing
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std::cout << "Testing " << numPackets << " packets sent with receiver rss " << rss << std::endl;
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Simulator::ScheduleWithContext(source->GetNode()->GetId(),
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Seconds(1.0),
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&GenerateTraffic,
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source,
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packetSize,
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numPackets,
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interval);
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Simulator::Stop(Seconds(30.0));
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Simulator::Run();
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Simulator::Destroy();
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return 0;
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}
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