ebb9193ef9
This patch attempts to lay some groundwork for enhancements to the Wi-Fi module by bringing the representation of transmit rates more in line with the standard. The key part of the patch is the introduction of a type that corresponds to the notion of Modulation Class described in IEEE 802.11-2007, Section 9.6.1, Table 9-2. It also adds coding rate information to the WifiModes and centralises their construction into a single WifiModeFactory method. The rates are also renamed with reference to their Modulation Class. WifiModes no longer have a WifiStandard, but the latter type still exists and is used to imply the set of WifiModes that a MAC/PHY pair will support.
168 lines
6.2 KiB
C++
168 lines
6.2 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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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 is an illustration of how one could use virtualization techniques to
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// allow running applications on virtual machines talking over simulated
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// networks.
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//
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// The actual steps required to configure the virtual machines can be rather
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// involved, so we don't go into that here. Please have a look at one of
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// our HOWTOs on the nsnam wiki for more details about how to get the
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// system confgured. For an example, have a look at "HOWTO Use Linux
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// Containers to set up virtual networks" which uses this code as an
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// example.
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//
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// The configuration you are after is explained in great detail in the
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// HOWTO, but looks like the following:
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//
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// +----------+ +----------+
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// | virtual | | virtual |
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// | Linux | | Linux |
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// | Host | | Host |
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// | | | |
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// | eth0 | | eth0 |
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// +----------+ +----------+
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// | |
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// +----------+ +----------+
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// | Linux | | Linux |
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// | Bridge | | Bridge |
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// +----------+ +----------+
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// | |
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// +------------+ +-------------+
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// | "tap-left" | | "tap-right" |
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// +------------+ +-------------+
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// | n0 n1 |
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// | +--------+ +--------+ |
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// +-------| tap | | tap |-------+
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// | bridge | | bridge |
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// +--------+ +--------+
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// | wifi | | wifi |
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// +--------+ +--------+
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// | |
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// ((*)) ((*))
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//
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// Wifi LAN
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//
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// ((*))
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// |
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// +--------+
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// | wifi |
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// +--------+
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// | access |
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// | point |
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// +--------+
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//
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#include <iostream>
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#include <fstream>
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#include "ns3/simulator-module.h"
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#include "ns3/node-module.h"
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#include "ns3/core-module.h"
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#include "ns3/wifi-module.h"
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#include "ns3/helper-module.h"
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using namespace ns3;
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NS_LOG_COMPONENT_DEFINE ("TapWifiVirtualMachineExample");
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int
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main (int argc, char *argv[])
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{
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CommandLine cmd;
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cmd.Parse (argc, argv);
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//
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// We are interacting with the outside, real, world. This means we have to
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// interact in real-time and therefore means we have to use the real-time
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// simulator and take the time to calculate checksums.
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//
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GlobalValue::Bind ("SimulatorImplementationType", StringValue ("ns3::RealtimeSimulatorImpl"));
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GlobalValue::Bind ("ChecksumEnabled", BooleanValue (true));
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//
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// Create two ghost nodes. The first will represent the virtual machine host
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// on the left side of the network; and the second will represent the VM on
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// the right side.
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//
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NodeContainer nodes;
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nodes.Create (2);
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//
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// We're going to use 802.11 A so set up a wifi helper to reflect that.
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//
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WifiHelper wifi = WifiHelper::Default ();
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wifi.SetStandard (WIFI_PHY_STANDARD_80211a);
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wifi.SetRemoteStationManager ("ns3::ConstantRateWifiManager", "DataMode", StringValue ("OfdmRate54Mbps"));
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//
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// No reason for pesky access points, so we'll use an ad-hoc network.
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//
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NqosWifiMacHelper wifiMac = NqosWifiMacHelper::Default ();
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wifiMac.SetType ("ns3::AdhocWifiMac");
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//
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// Configure the physcial layer.
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//
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YansWifiChannelHelper wifiChannel = YansWifiChannelHelper::Default ();
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YansWifiPhyHelper wifiPhy = YansWifiPhyHelper::Default ();
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wifiPhy.SetChannel (wifiChannel.Create ());
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//
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// Install the wireless devices onto our ghost nodes.
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//
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NetDeviceContainer devices = wifi.Install (wifiPhy, wifiMac, nodes);
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//
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// We need location information since we are talking about wifi, so add a
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// constant position to the ghost nodes.
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//
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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 (nodes);
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//
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// Use the TapBridgeHelper to connect to the pre-configured tap devices for
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// the left side. We go with "UseLocal" mode since the wifi devices do not
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// support promiscuous mode (because of their natures0. This is a special
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// case mode that allows us to extend a linux bridge into ns-3 IFF we will
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// only see traffic from one other device on that bridge. That is the case
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// for this configuration.
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//
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TapBridgeHelper tapBridge;
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tapBridge.SetAttribute ("Mode", StringValue ("UseLocal"));
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tapBridge.SetAttribute ("DeviceName", StringValue ("tap-left"));
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tapBridge.Install (nodes.Get (0), devices.Get (0));
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//
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// Connect the right side tap to the right side wifi device on the right-side
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// ghost node.
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//
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tapBridge.SetAttribute ("DeviceName", StringValue ("tap-right"));
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tapBridge.Install (nodes.Get (1), devices.Get (1));
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//
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// Run the simulation for ten minutes to give the user time to play around
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//
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Simulator::Stop (Seconds (600.));
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Simulator::Run ();
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Simulator::Destroy ();
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}
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