To implement the network rendezvous discovery in ns3 that has several steps that includes by making the mechanism for nodes to discover and relate with each other dynamically. This is usually used in the scenarios like mobile ad hoc networks (MANETs), peer-to-peer networks, or any situation where nodes need to discover and found communication with each other.

The given below is the sample procedure on how to implement the network rendezvous discovery in ns3:

Steps-by -Step Implementation:

Step 1: Set Up the Simulation Environment

• Make sure ns3 is installed in the computer.

Step 2: Create the Network Topology

• Generate the network topology using ns3 with multiple nodes.in the instance we need to simulate a basic scenario where nodes discover and connect with each other dynamically.

Step 3: Define the Rendezvous Discovery Application

• To simulate the rendezvous discovery mechanism by creating the custom applications

Step 4: Write the Script

• Now we are provide the sample on how to make and configure the network rendezvous discovery in ns3:

1. Create a New File:
   • Save the following script as network-rendezvous-discovery.cc in the scratch directory of your ns-3 installation.

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/point-to-point-module.h”

#include “ns3/mobility-module.h”

#include “ns3/wifi-module.h”

#include “ns3/applications-module.h”

#include “ns3/udp-client-server-helper.h”

#include <vector>

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“NetworkRendezvousDiscoveryExample”);

class RendezvousApplication : public Application

{

public:

RendezvousApplication ();

virtual ~RendezvousApplication ();

void Setup (Ptr<Socket> socket, Address address);

void StartDiscovery ();

protected:

virtual void StartApplication (void);

virtual void StopApplication (void);

private:

void DiscoverPeers ();

void ReceivePacket (Ptr<Socket> socket);

Ptr<Socket> m_socket;

Address m_peerAddress;

EventId m_discoveryEvent;

};

RendezvousApplication::RendezvousApplication ()

: m_socket (0)

{

}

RendezvousApplication::~RendezvousApplication ()

{

m_socket = 0;

}

void

RendezvousApplication::Setup (Ptr<Socket> socket, Address address)

{

m_socket = socket;

m_peerAddress = address;

}

void

RendezvousApplication::StartApplication (void)

{

m_socket->Bind ();

m_socket->SetRecvCallback (MakeCallback (&RendezvousApplication::ReceivePacket, this));

StartDiscovery ();

}

void

RendezvousApplication::StopApplication (void)

{

if (m_socket)

{

m_socket->Close ();

}

Simulator::Cancel (m_discoveryEvent);

}

void

RendezvousApplication::StartDiscovery ()

{

m_discoveryEvent=Simulator::Schedule(Seconds(1.0),&RendezvousApplication::DiscoverPeers, this);

}

void

RendezvousApplication::DiscoverPeers ()

{

Ptr<Packet> packet = Create<Packet> (1024); // Discovery packet

m_socket->SendTo (packet, 0, m_peerAddress);

NS_LOG_UNCOND (“Sent discovery packet”);

// Schedule the next discovery

m_discoveryEvent=Simulator::Schedule(Seconds(5.0),&RendezvousApplication::DiscoverPeers, this);

}

void

RendezvousApplication::ReceivePacket (Ptr<Socket> socket)

{

Ptr<Packet> packet = socket->Recv ();

NS_LOG_UNCOND (“Received discovery packet of size ” << packet->GetSize ());

}

int main (int argc, char *argv[])

{

CommandLine cmd;

cmd.Parse (argc, argv);

NodeContainer nodes;

nodes.Create (3); // Three nodes for rendezvous discovery

// Set up Wi-Fi network

WifiHelper wifi;

wifi.SetRemoteStationManager (“ns3::AarfWifiManager”);

YansWifiPhyHelper wifiPhy = YansWifiPhyHelper::Default ();

YansWifiChannelHelper wifiChannel = YansWifiChannelHelper::Default ();

wifiPhy.SetChannel (wifiChannel.Create ());

WifiMacHelper wifiMac;

Ssid ssid = Ssid (“ns-3-ssid”);

wifiMac.SetType (“ns3::StaWifiMac”,

“Ssid”, SsidValue (ssid),

“ActiveProbing”, BooleanValue (false));

NetDeviceContainer devices = wifi.Install (wifiPhy, wifiMac, nodes);

// Install the Internet stack on the nodes

InternetStackHelper stack;

stack.Install (nodes);

// Assign IP addresses to the devices

Ipv4AddressHelper address;

address.SetBase (“10.1.1.0”, “255.255.255.0”);

Ipv4InterfaceContainer interfaces = address.Assign (devices);

// Set up mobility

MobilityHelper mobility;

mobility.SetMobilityModel (“ns3::ConstantPositionMobilityModel”);

mobility.Install (nodes);

nodes.Get (0)->GetObject<MobilityModel> ()->SetPosition (Vector (0.0, 0.0, 0.0));

nodes.Get (1)->GetObject<MobilityModel> ()->SetPosition (Vector (50.0, 0.0, 0.0));

nodes.Get (2)->GetObject<MobilityModel> ()->SetPosition (Vector (100.0, 0.0, 0.0));

// Set up rendezvous applications

uint16_t port = 9;

for (uint32_t i = 0; i < nodes.GetN (); ++i)

{

Ptr<Socket> recvSink = Socket::CreateSocket (nodes.Get (i), UdpSocketFactory::GetTypeId ());

InetSocketAddress local = InetSocketAddress (Ipv4Address::GetAny (), port);

recvSink->Bind (local);

Ptr<Socket> source = Socket::CreateSocket (nodes.Get (i), UdpSocketFactory::GetTypeId ());

Ptr<RendezvousApplication> app = CreateObject<RendezvousApplication> ();

app->Setup (source, InetSocketAddress (Ipv4Address (“255.255.255.255”), port)); // Broadcast address

nodes.Get (i)->AddApplication (app);

app->SetStartTime (Seconds (1.0));

app->SetStopTime (Seconds (20.0));

}

// Enable packet capturing

wifiPhy.EnablePcap (“network-rendezvous-discovery”, devices);

// Run simulation

Simulator::Run ();

Simulator::Destroy ();

return 0;

}

Explanation:

1. Create Nodes and Network:
   • Create three nodes and connect them using Wi-Fi.
2. Set Up Wi-Fi Network:
   • Use WifiHelper, YansWifiPhyHelper, YansWifiChannelHelper, and WifiMacHelper to set up the Wi-Fi network.
   • Install Wi-Fi devices on the nodes.
   • Install the Internet stack on the nodes.
3. Assign IP Addresses:
   • Use Ipv4AddressHelper to assign IP addresses to the network interfaces.
4. Set Up Mobility:
   • Use MobilityHelper to set fixed positions for the nodes.
5. Define Rendezvous Application:
   • Create a RendezvousApplication class that sends discovery packets to a broadcast address and listens for incoming discovery packets.
   • The DiscoverPeers function sends a discovery packet to the broadcast address and schedules the next discovery event.
   • The ReceivePacket function handles incoming discovery packets and logs their reception.
6. Install and Configure the Application:
   • Create sockets for sending and receiving.
   • Install the RendezvousApplication on the nodes.
   • Configure the application with the necessary parameters and schedule the start and stop times.
7. Enable Packet Capturing:
   • Enable packet capturing using EnablePcap to capture the packets transmitted over the network.
8. Run the Simulation:
   • Schedule the start and stop times for the applications.
   • Run the simulation and log the results.

Step 4: Compile and Run the Script

1. Save the script as network-rendezvous-discovery.cc in the scratch directory of your ns-3 installation.
2. Compile the script using the following commands:

./waf configure

./waf build

./waf –run network-rendezvous-discovery

Step 5: Analyze the Results

After running the simulation, we need to estimate the outcomes by looking at the logs and the pcap files generated by the packet capturing to verify the behaviour of the rendezvous discovery application.

Overall, we all get the knowledge about how the network Rendezvous Discovery will perform and conduct the outcomes by use of ns3 tool. We further provide the additional details that relate to network Rendezvous Discovery.

If you face challenges To Implement network Rendezvous Discovery in ns3 for your project even after reading the above ideas, reach out for ns3simulation.com we help you in performance analysis with best outcomes.