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# How to Calculate Network Error Rate in ns3

To calculate the error rate in ns3, we need to analyse the number of packets that were degraded or lost in transmission that comparatively to the total number of packet sent. It is expressed in percentage or fraction.

Here are the steps on how to implement the error rate in ns3.

1. Set up Your Simulation Environment: Generate a network topology, Setup nodes, links, and protocols.
2. Install Applications: Configure applications on the nodes to generate and receive traffic.
3. Simulate Errors: Introduce errors in the network using an appropriate error model.
4. Trace Packets: to record the number of packets sent, received, and lost by using ns3 tracing abilities.
5. Calculate Error Rate: Calculate the ratio of lost or corrupted packets to the total number of packets sent.

Example: Simple Error Rate Calculation

Now, we are going to generate the network topology and estimate the error rate by introducing the rate error model.

Step 1: Set Up Your Simulation Environment

#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/error-model.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“ErrorRateExample”);

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

{

// Create two nodes

NodeContainer nodes;

nodes.Create (2);

// Set up the point-to-point link

PointToPointHelper pointToPoint;

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

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

// Install link devices on nodes

NetDeviceContainer devices = pointToPoint.Install (nodes);

// Create an error model

Ptr<RateErrorModel> em = CreateObject<RateErrorModel> ();

em->SetAttribute (“ErrorRate”, DoubleValue (0.01)); // 1% error rate

devices.Get (1)->SetAttribute (“ReceiveErrorModel”, PointerValue (em));

// Install the internet stack

InternetStackHelper stack;

stack.Install (nodes);

// Assign IP addresses

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer interfaces = address.Assign (devices);

// Set up the UDP echo server on Node 1

uint16_t port = 9; // well-known echo port number

UdpEchoServerHelper echoServer (port);

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

serverApps.Start (Seconds (1.0));

serverApps.Stop (Seconds (10.0));

// Set up the UDP echo client on Node 0

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

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

echoClient.SetAttribute (“Interval”, TimeValue (Seconds (0.1))); // 10 packets per second

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

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

clientApps.Start (Seconds (2.0));

clientApps.Stop (Seconds (10.0));

// Enable tracing

AsciiTraceHelper ascii;

pointToPoint.EnableAsciiAll (ascii.CreateFileStream (“error-rate-example.tr”));

// Set up a packet counter

uint32_t totalPacketsSent = 0;

uint32_t totalPacketsReceived = 0;

Config::ConnectWithoutContext (“/NodeList/0/ApplicationList/*/\$ns3::UdpEchoClient/Tx”, MakeCallback ([&](Ptr<const Packet> p) {

totalPacketsSent++;

}));

Config::ConnectWithoutContext (“/NodeList/1/ApplicationList/*/\$ns3::UdpEchoServer/Rx”, MakeCallback ([&](Ptr<const Packet> p) {

totalPacketsReceived++;

}));

// Run the simulation

Simulator::Run ();

// Calculate error rate

uint32_t totalPacketsLost = totalPacketsSent – totalPacketsReceived;

double errorRate = static_cast<double>(totalPacketsLost) / totalPacketsSent;

std::cout << “Total Packets Sent: ” << totalPacketsSent << std::endl;

std::cout << “Total Packets Received: ” << totalPacketsReceived << std::endl;

std::cout << “Total Packets Lost: ” << totalPacketsLost << std::endl;

std::cout << “Error Rate: ” << errorRate * 100 << ” %” << std::endl;

Simulator::Destroy ();

return 0;

}

Explanation

In this direction, we describe the process structurally;

1. Set up Your Simulation Environment: Create two nodes and connect them with a point-to-point link.
2. Install Applications: Install a UDP echo server on Node 1 and a UDP echo client on Node 0. Configure the client to send a specified number of packets at a specified interval.
3. Simulate Errors: Introduce a rate error model on the receiver node (Node 1) to simulate a 1% error rate.
4. Trace Packets: Use callbacks to count the number of packets sent and received.
5. Calculate Error Rate: Calculate the error rate as the ratio of the number of lost packets to the total number of packets sent.

Step-by-Step Breakdown

1. Create Nodes and Links: Two nodes are created and connected with a point-to-point link with a specified data rate and delay.
2. Configure Error Model: A rate error model is created and attached to the receiving device on Node 1, simulating a 1% packet error rate.
3. Install Internet Stack and Applications: The Internet stack is installed on the nodes, and a UDP echo server and client are set up to generate and receive traffic.
4. Trace Packet Transmission and Reception: Callbacks are used to count the number of packets sent by the client and received by the server.
5. Calculate Error Rate: The total number of lost packets is calculated by subtracting the number of received packets from the number of sent packets. The error rate is then calculated as the ratio of lost packets to send packets.

Lastly, we calculate by creating a network topology, then configure the application and trace the packets sent and received then finally we compute the error rate in ns3 simulator. If you want further details about error rate we were provide and support.

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