How to Implement Network Delay Assessment in ns3

To implement network delay assessment in ns3, we need to set up a network topology which generates traffic and use appropriate tools to measure and analyze the delay.

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Here is a guide to achieve this.

Steps for implementation

Step 1: Set up the simulation

Make sure that ns3 is installed in the computer. If not, install it.

Step 2: Create the network topology

Define the network topology with two nodes connected by a point-to-point link.

Step 3: Write the script

Here is an example script to create and configure a network topology to simulate network d delay assessment  using 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/flow-monitor-helper.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“DelayAssessmentExample”);

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

{

CommandLine cmd;

cmd.Parse (argc, argv);

// Create nodes

NodeContainer nodes;

nodes.Create (2);

// Create point-to-point links and set attributes

PointToPointHelper pointToPoint;

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

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

// Install devices and links

NetDeviceContainer devices;

devices = pointToPoint.Install (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);

// Create a UDP server application on node 1

UdpEchoServerHelper echoServer (9);

ApplicationContainer serverApps = echoServer.Install (nodes.Get (1));

serverApps.Start (Seconds (1.0));

serverApps.Stop (Seconds (10.0));

// Create a UDP client application on node 0

UdpEchoClientHelper echoClient (interfaces.GetAddress (1), 9);

echoClient.SetAttribute (“MaxPackets”, UintegerValue (100));

echoClient.SetAttribute (“Interval”, TimeValue (Seconds (0.1)));

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

ApplicationContainer clientApps = echoClient.Install (nodes.Get (0));

clientApps.Start (Seconds (2.0));

clientApps.Stop (Seconds (10.0));

// Enable Flow Monitor to collect performance metrics

FlowMonitorHelper flowmon;

Ptr<FlowMonitor> monitor = flowmon.InstallAll ();

// Run the simulation

Simulator::Stop (Seconds (10.0));

Simulator::Run ();

// Output Flow Monitor statistics

monitor->CheckForLostPackets ();

Ptr<Ipv4FlowClassifier> classifier = DynamicCast<Ipv4FlowClassifier> (flowmon.GetClassifier ());

std::map<FlowId, FlowMonitor::FlowStats> stats = monitor->GetFlowStats ();

for (std::map<FlowId, FlowMonitor::FlowStats>::const_iterator i = stats.begin (); i != stats.end (); ++i)

{

Ipv4FlowClassifier::FiveTuple t = classifier->FindFlow (i->first);

std::cout << “Flow ID: ” << i->first << ” Source Address: ” << t.sourceAddress << ” Destination Address: ” << t.destinationAddress << std::endl;

std::cout << “Tx Packets = ” << i->second.txPackets << std::endl;

std::cout << “Rx Packets = ” << i->second.rxPackets << std::endl;

std::cout << “Delay: ” << i->second.delaySum.GetSeconds() / i->second.rxPackets << ” s” << std::endl;

std::cout << “Throughput: ” << i->second.rxBytes * 8.0 / (i->second.timeLastRxPacket.GetSeconds () – i->second.timeFirstTxPacket.GetSeconds ()) / 1024 / 1024 << ” Mbps” << std::endl;

std::cout << “Packet Loss Ratio: ” << (i->second.txPackets – i->second.rxPackets) / static_cast<double>(i->second.txPackets) << std::endl;

}

// Clean up the simulation

Simulator::Destroy ();

return 0;

}

Explanation:

1. Create Nodes:
   • Two nodes are created and connected them using point-to-point links..
2. Install Internet Stack:
   • On all nodes, install the Internet stack.
3. Assign IP Addresses:
   • Assign IP addresses to the devices.
4. Set Up Applications:
   • On the node 1, create a UDP Echo server.
   • On the node 0, create a UDP Echo client.
5. Enable Flow Monitor:
   • Collect performance metrics by installing Flow Monitor.
6. Run Simulation:
   • Run the simulation and print the statistics which was collected.

Step 4: Build and Run the Simulation

Save the script as delay-assessment-example.cc and build the script using waf, then run the simulation.

./waf configure

./waf build

./waf –run delay-assessment-example

Step 5: Analyze the results

The script will output performance metrics such as the number of transmitted and received packets, delay, throughput, and packet loss ratio after running the simulation. We can analyze the data to understand the performance of the network delay.

Overall, we had an analysis on the implementation of network delay assessment by setting up a network topology generating traffic, and using appropriate tools to measure and analyze the delay.