How to Calculate Transmission Quality in ns3

To calculate the transmission Quality in ns3, we need estimate the numerous network performance parameters that influence the quality of transmission. The given below are the parameters that are

1. Throughput: The rate at which data is successfully transmitted over the network.
2. Packet Loss: The percentage of packets those are lost during transmission.
3. Delay (Latency): The time taken for a packet to travel from the source to the destination.
4. Jitter: The variation in packet delay.

By gathering these metrics in the course of execution and related to a model that can derive the transmission quality score. Here we provide the step by procedures to configure the transmission of data, gather the relevant metrics and evaluate the fundamental of quality score based these metrics.

Steps to Calculate Transmission Quality in ns3

1. Set Up ns3 Environment:

1. • Make sure ns3 is installed.

2. Create a New ns3 Script:

1. • Create a new script file in the scratch directory of ns3, e.g., transmission_quality.cc.

3. Include Necessary Headers:

1. • In the script add the essential ns3 headers.

4. Define Network Topology:

1. • Use multiple nodes to Set up a network topology.

5. Implement Metrics Collection:

1. • Use FlowMonitor to collect throughput, packet loss, delay, and jitter.

6. Calculate Transmission Quality:

1. • To calculate transmission quality based on the collected metrics by use of functions.

Example Code:

The given below are the sample demonstration to complete the script that are

#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-module.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“TransmissionQualityExample”);

double CalculateTransmissionQuality(double throughput, double packetLoss, double delay, double jitter)

{

// Simple model to calculate transmission quality score

double quality = (throughput / 1e6) – (packetLoss * 100) – (delay * 1000) – (jitter * 1000);

if (quality < 0) quality = 0;

return quality;

}

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

{

uint32_t nNodes = 2; // Number of nodes

double simulationTime = 10.0; // Total simulation time in seconds

CommandLine cmd;

cmd.AddValue(“nNodes”, “Number of nodes”, nNodes);

cmd.AddValue(“simulationTime”, “Total simulation time”, simulationTime);

cmd.Parse(argc, argv);

NodeContainer nodes;

nodes.Create(nNodes);

PointToPointHelper pointToPoint;

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

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

NetDeviceContainer devices;

devices = pointToPoint.Install(nodes);

InternetStackHelper stack;

stack.Install(nodes);

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer interfaces = address.Assign(devices);

uint16_t port = 9;

Address serverAddress(InetSocketAddress(interfaces.GetAddress(1), port));

UdpEchoServerHelper echoServer(port);

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

serverApps.Start(Seconds(1.0));

serverApps.Stop(Seconds(simulationTime));

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

echoClient.SetAttribute(“MaxPackets”, UintegerValue(1000));

echoClient.SetAttribute(“Interval”, TimeValue(Seconds(0.01)));

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

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

clientApps.Start(Seconds(2.0));

clientApps.Stop(Seconds(simulationTime));

FlowMonitorHelper flowmon;

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

Simulator::Stop(Seconds(simulationTime));

Simulator::Run();

// Calculate metric

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

FlowMonitor::FlowStatsContainer stats = monitor->GetFlowStats();

double totalThroughput = 0.0;

double totalPacketLoss = 0.0;

double totalDelay = 0.0;

double totalJitter = 0.0;

uint32_t totalPackets = 0;

for (auto it = stats.begin(); it != stats.end(); ++it)

{

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

if (t.destinationPort == port)

{

totalThroughput += it->second.rxBytes * 8.0 / (simulationTime – 2); // bits per second

totalPacketLoss += it->second.lostPackets;

totalDelay += it->second.delaySum.GetSeconds();

totalJitter += it->second.jitterSum.GetSeconds();

totalPackets += it->second.rxPackets + it->second.lostPackets;

}

}

if (totalPackets > 0)

{

totalDelay /= totalPackets;

totalJitter /= totalPackets;

totalPacketLoss /= totalPackets;

}

double quality = CalculateTransmissionQuality(totalThroughput, totalPacketLoss, totalDelay, totalJitter);

std::cout << “Transmission Quality Score: ” << quality << std::endl;

Simulator::Destroy();

return 0;

}

Explanation:

At this direction we provide the detailed structure to process the Transmission Quality in ns:

1. Nodes and Links:
   • Created nodes and configured a point-to-point network for communication.
   • Set up the network with nodes connected using point-to-point links.
2. Applications:
   • Installed a UDP echo server on one node.
   • Installed a UDP echo client on another node to generate traffic.
3. Flow Monitor:
   • Used the FlowMonitor module to collect data on packet transmissions, including throughput, packet loss, delay, and jitter.
4. Transmission Quality Calculation:
   • Implemented the CalculateTransmissionQuality function to calculate a simple quality score based on throughput, packet loss, delay, and jitter.
   • The model used in this example is simplistic and should be adjusted based on specific requirements and more sophisticated models.
5. Running the Simulation:
   • The simulation runs, collecting data using FlowMonitor.
   • After the simulation, the transmission quality score is calculated and printed.

Finally, we had calculated and simulated the Transmission Quality metrics in ns3 can done utterly.

Upon analyzing your specified criteria, we will furnish you with relevant information concerning transmission quality in NS3. Kindly share the parameters that need to be compared against simulations on NS3simulation.com.