Association of AP and STA

[Hiroya Okuma]

Hello Everybody,

I am trying to simulate wireless communication using WiFi with the topology shown in the attached file with ns-3.

Assume that three access networks are connected to the server.

In the access network, one router node is connected to one AP node, and I want to configure a simulator in which one user node connects to one AP node. As shown in the attachment "unintended behaiver", they are communicating between different access networks.

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  int main (int argc, char *argv[])

  {

    std::string phyMode ("DsssRate1Mbps");

    uint32_t staNum = 3;// consumer

    int apNum = 3;// number of AP nodes

    int range = 10;// meter

    double endtime = 2000.0;

  

    CommandLine cmd;

    cmd.Parse (argc, argv);

    

    ////// Reading file for topology setup

    AnnotatedTopologyReader topologyReader("", 1);

    topologyReader.SetFileName("src/ndnSIM/examples/LScale-topo.txt");

    topologyReader.Read();

    ////// Getting containers for the producer/wifi-ap

    Ptr<Node> producer = Names::Find<Node>("root");

    Ptr<Node> wifiApNodes[3] = {Names::Find<Node>("ap1"),

                                Names::Find<Node>("ap2"),

                                Names::Find<Node>("ap3")};

    

    Ptr<Node> routers[4] = {Names::Find<Node>("r1"),

                                Names::Find<Node>("r2"),

                                Names::Find<Node>("r3"),

                                Names::Find<Node>("r0")};

    ////// disable fragmentation, RTS/CTS for frames below 2200 bytes and fix non-unicast data rate

    Config::SetDefault("ns3::WifiRemoteStationManager::FragmentationThreshold", StringValue("2200"));

    Config::SetDefault ("ns3::WifiRemoteStationManager::RtsCtsThreshold", StringValue("2200"));

    Config::SetDefault ("ns3::WifiRemoteStationManager::NonUnicastMode", StringValue(phyMode));

    ////// The below set of helpers will help us to put together the wifi NICs we want

    WifiHelper wifi;

    wifi.SetStandard (WIFI_PHY_STANDARD_80211b);

    YansWifiPhyHelper wifiPhy = YansWifiPhyHelper::Default ();

    ////// This is one parameter that matters when using FixedRssLossModel

    ////// set it to zero; otherwise, gain will be added

    // wifiPhy.Set ("RxGain", DoubleValue (0) );

    ////// ns-3 supports RadioTap and Prism tracing extensions for 802.11b

    wifiPhy.SetPcapDataLinkType (YansWifiPhyHelper::DLT_IEEE802_11_RADIO);

    YansWifiChannelHelper wifiChannel;

    wifiChannel.SetPropagationDelay("ns3::ConstantSpeedPropagationDelayModel");

    // wifiChannel.AddPropagationLoss("ns3::NakagamiPropagationLossModel");

    ////// The below FixedRssLossModel will cause the rss to be fixed regardless of the distance between the two stations, and the transmit power

    // wifiChannel.AddPropagationLoss ("ns3::FixedRssLossModel","Rss",DoubleValue(rss));

    ////// the following has an absolute cutoff at distance > range (range == radius)

    wifiChannel.AddPropagationLoss ("ns3::RangePropagationLossModel",

                                    "MaxRange", DoubleValue(range));

    wifiPhy.SetChannel (wifiChannel.Create ());

    wifi.SetRemoteStationManager ("ns3::ConstantRateWifiManager",

                                  "DataMode", StringValue (phyMode),

                                  "ControlMode", StringValue (phyMode));

    ////// Setup the rest of the upper mac

    ////// Setting SSID, optional. Modified net-device to get Bssid, mandatory for AP unicast

    Ssid ssid = Ssid ("wifi-default");

    // wifi.SetRemoteStationManager ("ns3::ArfWifiManager");

    ////// Add a non-QoS upper mac of STAs, and disable rate control

    NqosWifiMacHelper wifiMacHelper = NqosWifiMacHelper::Default ();

    ////// Active associsation of STA to AP via probing.

    wifiMacHelper.SetType ("ns3::StaWifiMac", "Ssid", SsidValue (ssid),

                           "ActiveProbing", BooleanValue (true),

                           "ProbeRequestTimeout", TimeValue(Seconds(0.25)));

    ////// Creating 2 mobile nodes

    NodeContainer consumers;

    consumers.Create(staNum);

    // 1. Install WiFi

    NetDeviceContainer staDevice = wifi.Install (wifiPhy, wifiMacHelper, consumers);

    NetDeviceContainer devices = staDevice;

    //NetDeviceContainer staDevice1 = wifi.Install (wifiPhy, wifiMacHelper, consumers[1]);

    //devices.Add (staDevice1);

    ////// Setup AP.

    NqosWifiMacHelper wifiMac = NqosWifiMacHelper::Default ();

    wifiMac.SetType ("ns3::ApWifiMac", "Ssid", SsidValue (ssid),

                     "BeaconGeneration", BooleanValue(false));

    for (int i = 0; i < apNum; i++)

    {

        NetDeviceContainer apDevice = wifi.Install (wifiPhy, wifiMac, wifiApNodes[i]);

        devices.Add (apDevice);

    }

    ////// Note that with FixedRssLossModel, the positions below are not

    ////// used for received signal strength.

    

    ////// set positions for APs

    MobilityHelper sessile;

    Ptr<ListPositionAllocator> positionAlloc = CreateObject<ListPositionAllocator> ();

    int XposAp = 0;

    for (int i=0; i < apNum; i++) {

        positionAlloc->Add(Vector(10+XposAp, -10, 0.0));

        XposAp += 20;

    }

    sessile.SetPositionAllocator (positionAlloc);

    for (int i = 0; i < apNum; i++) {

        sessile.SetMobilityModel ("ns3::ConstantPositionMobilityModel");

        sessile.Install (wifiApNodes[i]);

    }

    

    ////// Setting mobility model and movement parameters for mobile nodes

    ////// ConstantVelocityMobilityModel is a subclass of MobilityModel

    MobilityHelper sessileConsumer;

    Ptr<ListPositionAllocator> positionConsumer = CreateObject<ListPositionAllocator> ();

    int XposSta = 0;

    for (int i=0; i<int(staNum); i++){

      positionConsumer->Add(Vector(10+XposSta, 0.0, 0.0));

      XposSta += 20;

    }

    sessileConsumer.SetPositionAllocator (positionConsumer);

    for (int i=0; i<int(staNum); i++){

      sessileConsumer.SetMobilityModel("ns3::ConstantVelocityMobilityModel");

      sessileConsumer.Install(consumers.Get(i));

    }

/*

    ////// Setting each sessileConsumer 100m apart from each other

    int nxt = 0;

    for (uint32_t i=0; i<staNum ; i++) {

        Ptr<ConstantVelocityMobilityModel> cvmm = consumers.Get(i)->GetObject<ConstantVelocityMobilityModel> ();

        Vector pos (0-nxt, 0, 0);

        Vector vel (speed, 0, 0);

        cvmm->SetPosition(pos);

        cvmm->SetVelocity(vel);

        nxt += 100;

    }

*/

    // 3. Install NDN stack on all nodes

    NS_LOG_INFO("Installing NDN stack");

    ndn::StackHelper ndnHelper;

    ndnHelper.setCsSize(1000);

    ndnHelper.InstallAll();

    // Choosing forwarding strategy

    ndn::StrategyChoiceHelper::InstallAll("/prefix", "/localhost/nfd/strategy/best-route");

    //ndn::StrategyChoiceHelper::InstallAll("/", "/localhost/nfd/strategy/best-route");

    // Installing global routing interface on all nodes

    ndn::GlobalRoutingHelper ndnGlobalRoutingHelper;

    ndnGlobalRoutingHelper.InstallAll();

・・・Below, the part concerning the application is omitted

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It's been a while since I started using ns-3, and I don't have much knowledge.

Best Regards,

Hiroya Okuma

[fordev user]

Hello, 

Please how can you get this image is it from netanim? 

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