279 lines
9.7 KiB
C++
279 lines
9.7 KiB
C++
/*
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* Copyright (c) 2009 The Boeing Company
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*
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*/
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// This script configures three nodes on an 802.11b physical layer, with
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// 802.11b NICs in adhoc mode. There is a transmitter, receiver, and
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// interferer. The transmitter sends one packet to the receiver and
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// the receiver receives it with a certain configurable RSS (by default,
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// -80 dBm). The interferer does not do carrier sense and also sends
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// the packet to interfere with the primary packet. The channel model
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// is clear channel.
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//
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// Therefore, at the receiver, the reception looks like this:
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//
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// ------------------time---------------->
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// t0
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//
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// |------------------------------------|
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// | |
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// | primary received frame (time t0) |
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// | |
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// |------------------------------------|
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//
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//
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// t1
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// |-----------------------------------|
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// | |
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// | interfering frame (time t1) |
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// | |
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// |-----------------------------------|
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//
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// The orientation is:
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// n2 ---------> n0 <---------- n1
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// interferer receiver transmitter
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//
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// The configurable parameters are:
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// - Prss (primary rss) (-80 dBm default)
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// - Irss (interfering rss) (-95 dBm default)
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// - delta (t1-t0, may be negative, default 0ns)
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// - PpacketSize (primary packet size) (bytes, default 1000)
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// - IpacketSize (interferer packet size) (bytes, default 1000)
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//
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// For instance, for this configuration, the interfering frame arrives
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// at -90 dBm with a time offset of 3.2 microseconds:
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//
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// ./ns3 run "wifi-simple-interference --Irss=-90 --delta=3.2ns"
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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-interference --verbose=1"
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//
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// When you are done, you will notice a pcap trace file 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-interference-0-0.pcap -nn -tt
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// reading from file wifi-simple-interference-0-0.pcap, link-type IEEE802_11_RADIO (802.11 plus BSD
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// radio information header) 10.008704 10008704us tsft 1.0 Mb/s 2437 MHz (0x00c0) -80dB signal -98dB
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// noise IP 10.1.1.2.49153 > 10.1.1.255.80: UDP, length 1000
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//
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// Next, try this command and look at the tcpdump-- you should see two packets
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// that are no longer interfering:
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// ./ns3 run "wifi-simple-interference --delta=30000ns"
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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/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("WifiSimpleInterference");
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/**
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* Print a packer that has been received.
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*
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* \param socket The receiving socket.
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* \return a string with the packet details.
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*/
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static inline std::string
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PrintReceivedPacket(Ptr<Socket> socket)
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{
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Address addr;
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std::ostringstream oss;
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while (socket->Recv())
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{
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socket->GetSockName(addr);
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InetSocketAddress iaddr = InetSocketAddress::ConvertFrom(addr);
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oss << "Received one packet! Socket: " << iaddr.GetIpv4() << " port: " << iaddr.GetPort();
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}
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return oss.str();
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}
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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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static void
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ReceivePacket(Ptr<Socket> socket)
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{
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NS_LOG_UNCOND(PrintReceivedPacket(socket));
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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 seding socket.
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* \param pktSize The packet size.
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* \param pktCount The packet counter.
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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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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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dBm_u Prss{-80};
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dBm_u Irss{-95};
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Time delta{"0ns"};
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uint32_t PpacketSize{1000}; // bytes
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uint32_t IpacketSize{1000}; // bytes
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bool verbose{false};
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// these are not command line arguments for this version
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uint32_t numPackets{1};
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Time interPacketInterval{"1s"};
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Time startTime{"10s"};
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meter_u distanceToRx{100.0};
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double offset{91}; // This is a magic number used to set the
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// transmit power, based on other configuration
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CommandLine cmd(__FILE__);
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cmd.AddValue("phyMode", "Wifi Phy mode", phyMode);
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cmd.AddValue("Prss", "Intended primary received signal strength (dBm)", Prss);
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cmd.AddValue("Irss", "Intended interfering received signal strength (dBm)", Irss);
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cmd.AddValue("delta", "time offset for interfering signal", delta);
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cmd.AddValue("PpacketSize", "size of application packet sent", PpacketSize);
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cmd.AddValue("IpacketSize", "size of interfering packet sent", IpacketSize);
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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(3);
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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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// 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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wifiChannel.AddPropagationLoss("ns3::LogDistancePropagationLossModel");
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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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// Set it to adhoc mode
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wifiMac.SetType("ns3::AdhocWifiMac");
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NetDeviceContainer devices = wifi.Install(wifiPhy, wifiMac, c.Get(0));
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// This will disable these sending devices from detecting a signal
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// so that they do not backoff
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wifiPhy.Set("TxGain", DoubleValue(offset + Prss));
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devices.Add(wifi.Install(wifiPhy, wifiMac, c.Get(1)));
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wifiPhy.Set("TxGain", DoubleValue(offset + Irss));
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devices.Add(wifi.Install(wifiPhy, wifiMac, c.Get(2)));
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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(distanceToRx, 0.0, 0.0));
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positionAlloc->Add(Vector(-1 * distanceToRx, 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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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("10.1.1.1"), 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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// Interferer will send to a different port; we will not see a
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// "Received packet" message
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Ptr<Socket> interferer = Socket::CreateSocket(c.Get(2), tid);
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InetSocketAddress interferingAddr = InetSocketAddress(Ipv4Address("255.255.255.255"), 49000);
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interferer->SetAllowBroadcast(true);
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interferer->Connect(interferingAddr);
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// Tracing
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wifiPhy.EnablePcap("wifi-simple-interference", devices.Get(0));
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// Output what we are doing
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NS_LOG_UNCOND("Primary packet RSS=" << Prss << " dBm and interferer RSS=" << Irss
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<< " dBm at time offset=" << delta.As(Time::US));
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Simulator::ScheduleWithContext(source->GetNode()->GetId(),
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startTime,
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&GenerateTraffic,
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source,
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PpacketSize,
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numPackets,
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interPacketInterval);
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Simulator::ScheduleWithContext(interferer->GetNode()->GetId(),
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startTime + delta,
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&GenerateTraffic,
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interferer,
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IpacketSize,
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numPackets,
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interPacketInterval);
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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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