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# How to Calculate Network Traveling path length in Ns3

To calculate the network traveling path length in ns3, by tracing the packet path and summing up the distances between consecutive nodes. Using this we had to determine the total distance travelled by packets through the network as they move from their source to their destination.

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Here we had provided the steps to calculate Network Traveling path length in ns3.

Step-by-Step Guide to Calculate Network Traveling Path Length in ns3

1. Set Up the Simulation Environment:
• Install ns3 and ensure it is correctly set up.
• Include necessary modules for your simulation (e.g., Internet, Mobility).
2. Create Network Topology:
• Define nodes and configure the network topology.
• Set up point-to-point links, WiFi devices, and mobility models for the nodes.
3. Implement Path Tracing:
• Trace the path of packets as they move through the network.
• Record the positions of nodes that packets traverse.
4. Calculate Path Length:
• Calculate the Euclidean distance between consecutive nodes in the packet path.
• Sum these distances to get the total path length.
5. Run the Simulation:
• Execute the simulation and collect the trace data.
6. Analyze the Results:
• Post-process the trace data to calculate the traveling path length.

Example Code Snippet for Calculating Traveling Path Length

Here’s an example of how to set up a network, trace the path of packets, and calculate the traveling path length in ns3:

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

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

#include “ns3/applications-module.h”

#include “ns3/mobility-module.h”

#include “ns3/log.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“TravelingPathLengthExample”);

std::map<uint32_t, std::vector<Vector>> packetPaths;

{

uint32_t packetId = packet->GetUid ();

Vector position = node->GetObject<MobilityModel> ()->GetPosition ();

packetPaths[packetId].push_back (position);

}

double CalculatePathLength (const std::vector<Vector> &path)

{

double totalLength = 0.0;

for (size_t i = 1; i < path.size (); ++i)

{

totalLength += CalculateDistance (path[i-1], path[i]);

}

}

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

{

// Set up logging

LogComponentEnable (“UdpClient”, LOG_LEVEL_INFO);

LogComponentEnable (“UdpServer”, LOG_LEVEL_INFO);

// Create nodes

NodeContainer nodes;

nodes.Create (4);

// Install Mobility model

MobilityHelper mobility;

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

mobility.Install (nodes);

// Set node positions

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

nodes.Get (1)->GetObject<MobilityModel> ()->SetPosition (Vector (50, 0, 0));

nodes.Get (2)->GetObject<MobilityModel> ()->SetPosition (Vector (100, 0, 0));

nodes.Get (3)->GetObject<MobilityModel> ()->SetPosition (Vector (150, 0, 0));

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute (“DataRate”, StringValue (“5Mbps”));

pointToPoint.SetChannelAttribute (“Delay”, StringValue (“2ms”));

NetDeviceContainer devices;

devices.Add (pointToPoint.Install (nodes.Get (0), nodes.Get (1)));

devices.Add (pointToPoint.Install (nodes.Get (1), nodes.Get (2)));

devices.Add (pointToPoint.Install (nodes.Get (2), nodes.Get (3)));

// Install Internet stack

InternetStackHelper internet;

internet.Install (nodes);

// Install and start applications on nodes

uint16_t port = 9; // Discard port (RFC 863)

UdpServerHelper server (port);

ApplicationContainer serverApp = server.Install (nodes.Get (3));

serverApp.Start (Seconds (1.0));

serverApp.Stop (Seconds (10.0));

client.SetAttribute (“MaxPackets”, UintegerValue (320));

client.SetAttribute (“Interval”, TimeValue (MilliSeconds (50)));

client.SetAttribute (“PacketSize”, UintegerValue (1024));

ApplicationContainer clientApp = client.Install (nodes.Get (0));

clientApp.Start (Seconds (2.0));

clientApp.Stop (Seconds (10.0));

// Run the simulation

Simulator::Stop (Seconds (11.0));

Simulator::Run ();

// Calculate and log the traveling path length for each packet

for (const auto &entry : packetPaths)

{

uint32_t packetId = entry.first;

const std::vector<Vector> &path = entry.second;

double pathLength = CalculatePathLength (path);

NS_LOG_UNCOND (“Packet ID: ” << packetId << “, Path Length: ” << pathLength << ” meters”);

}

// Clean up

Simulator::Destroy ();

return 0;

}

Explanation:

1. Setup Logging:
• Enable logging for the UDP applications to track their activities.
2. Create Nodes:
• Create a set of nodes representing devices in the network.
3. Install Mobility Model:
• Install a mobility model on the nodes (e.g., ConstantPositionMobilityModel).
4. Set Node Positions:
• Set the positions of the nodes manually for simplicity.
• Install point-to-point links between the nodes.
6. Install Internet Stack:
• Install the Internet stack on the nodes.
• Assign IP addresses to the network interfaces.
8. Install Applications:
• Install UDP server and client applications on the nodes.
• Use a callback function to trace received packets and log their positions.
10. Calculate Path Length:
• Implement a function to calculate the Euclidean distance between consecutive nodes in the packet path.
• Sum these distances to get the total path length.
11. Run Simulation:
• Run the simulation for the specified duration.
12. Log Path Length:
• After the simulation, calculate and log the traveling path length for each packet.

Analyzing the Results:

• Traveling Path Length:
• The traveling path length is calculated as the sum of the Euclidean distances between consecutive nodes in the packet path.
• This metric provides an indication of the distance traveled by packets as they move through the network.

The steps given above elaborately explains about the calculation of Network Traveling path length in ns3 and the results are analyzed.