How to Begin Implement Network Gross and Net Bit Rate in NS3

To implement and examine the Network Gross Bit Rate and Net Bit Rate in NS3, we need recognize their definitions and changes and setting the network for compute the parameter metrics.

Steps to Begin Implement Network Gross and Net Bit Rate in NS3

Key Concepts

1. Gross Bit Rate:
   • The raw data rate for the communication channel, has involves the together payload and overhead such as headers, error correction, etc.
   • Signify the complete amount of bits communicated per second.
2. Net Bit Rate:
   • The effective data rate available for user data, not including the protocol overhead.
   • Net Bit Rate = Gross Bit Rate − Overhead.

Steps to Implement Network Gross and Net Bit Rate in NS3

1. Understand the Metrics

• Gross Bit Rate:
  • Establish through the physical layer or connection setting for instance data rate in PointToPoint or WiFi.
• Net Bit Rate:
  • Computed according to the actual payload for communicated per second.

2. Set up NS3 Environment

1. Install NS3:
   • Assure the NS3 is installed. Download it from the NS3 website.
2. Define a Network Scenario:
   • Use a basic demonstration for point-to-point or wireless network.

3. Calculate Gross and Net Bit Rates

• Gross Bit Rate:
  • Organized using attributes such as DataRate in the PointToPointHelper.
• Net Bit Rate:
  • Calculated through computing a payload such as user data communicated per second.

4. Implement Bit Rate Calculation

Under is a sample script for estimate and log the gross and net bit rates.

Example Script: Gross and Net Bit Rate 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”

using namespace ns3;

void CalculateBitRates(uint64_t grossBitRate, Ptr<FlowMonitor> monitor, double simulationTime) {

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

uint64_t totalBytes = 0;

for (auto const &flow : stats) {

totalBytes += flow.second.rxBytes; // Payload bytes received

}

double netBitRate = (totalBytes * 8.0) / simulationTime; // Net bit rate in bits/second

NS_LOG_UNCOND(“Gross Bit Rate: ” << grossBitRate / 1e6 << ” Mbps”);

NS_LOG_UNCOND(“Net Bit Rate: ” << netBitRate / 1e6 << ” Mbps”);

}

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

CommandLine cmd;

cmd.Parse(argc, argv);

// Create nodes

NodeContainer nodes;

nodes.Create(2);

// Configure Point-to-Point link

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute(“DataRate”, StringValue(“10Mbps”)); // Gross bit rate

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

NetDeviceContainer devices = pointToPoint.Install(nodes);

// Install 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);

// Install applications

uint16_t port = 9;

UdpEchoServerHelper server(port);

ApplicationContainer serverApp = server.Install(nodes.Get(1));

serverApp.Start(Seconds(1.0));

serverApp.Stop(Seconds(10.0));

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

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

client.SetAttribute(“Interval”, TimeValue(MilliSeconds(100))); // Packet every 100 ms

client.SetAttribute(“PacketSize”, UintegerValue(1024));        // Payload size: 1024 bytes

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

clientApp.Start(Seconds(2.0));

clientApp.Stop(Seconds(10.0));

// Install Flow Monitor

FlowMonitorHelper flowmonHelper;

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

// Schedule bit rate calculation

double simulationTime = 10.0; // seconds

uint64_t grossBitRate = 10e6; // 10 Mbps

Simulator::Schedule(Seconds(simulationTime), &CalculateBitRates, grossBitRate, monitor, simulationTime);

Simulator::Run();

Simulator::Destroy();

return 0;

}

Explanation of the Script

1. Gross Bit Rate:
   • Setting as 10 Mbps using the PointToPointHelper.
2. Net Bit Rate:
   • Designed as: Net Bit Rate=Total Payload Bytes Received×8Simulation Time\text{Net Bit Rate} = \frac{\text{Total Payload Bytes Received} \times 8}{\text{Simulation Time}}Net Bit Rate=Simulation TimeTotal Payload Bytes Received×8​
3. Flow Monitoring:
   • The FlowMonitor component is used to monitor the payload bytes are received.
4. UDP Application:
   • A UdpEchoClient forwarding the packets for UdpEchoServer, replicate a congestion for bit rate study.

5. Run the Simulation

1. Build the script:

./waf –run “your-script-name”

1. Follow the logs for gross and net bit rates at final for the replication.

6. Analyze Results

• Overhead Impact:
  • The packet sizes are different to examine on how the protocol overhead affects the net bit rate.
• Gross vs. Net Bit Rate:
  • Associates are gross and net bit rates for measure the impact of overhead.

In this script, we had explored how the gross and net bit rates calculate the data at various layers of network stack using ns3. Any concerns regarding this project will be resolved in an extra manual.