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# How to Calculate Network Buffer Rate in ns3

To calculate the buffer rate in ns3, a usually measure the rate in the network while data is buffered (or the rate at which the buffer fills up) at a node. In a specific model where the data buffering is crucial in simulation that contains streaming media or other applications. We provide more information regarding the execution of the buffer rate in alternative simulated tool.

Here are the procedures on how to calculate the buffer rate in ns3:

Steps to Calculate Buffer Rate in ns3

1. Set Up ns3 Environment:
• Make sure ns3 is installed
2. Create a New ns3 Script:
• Create a new script file in the scratch directory of ns3, e.g., buffer_rate_calculation.cc.
3. Include Necessary Headers:
• In the script conclude the essential ns3 headers.
4. Define Network Topology:
• Use multiple nodes to set up a network topology.
5. Implement Buffer Management:
• Use the PacketSink application to simulate buffering at the receiving node.
6. Measure Buffer Rate:
• Track the amount of data received over time to calculate the buffer rate.

Example Code:

The given below are the complete sample script to calculate the  buffer 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;

NS_LOG_COMPONENT_DEFINE (“BufferRateCalculationExample”);

void CalculateBufferRate(Ptr<PacketSink> sink, Time interval)

{

static uint64_t lastTotalRx = 0;

uint64_t totalRx = sink->GetTotalRx();

uint64_t rxBytes = totalRx – lastTotalRx;

lastTotalRx = totalRx;

double bufferRate = (rxBytes * 8) / interval.GetSeconds(); // bits per second

std::cout << Simulator::Now().GetSeconds() << “s: Buffer Rate = ” << bufferRate / 1e6 << ” Mbps” << std::endl;

Simulator::Schedule(interval, &CalculateBufferRate, sink, interval); // Schedule next calculation

}

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

{

uint32_t nNodes = 2; // Number of nodes

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

Time calculationInterval = Seconds(1.0); // Interval to calculate buffer rate

CommandLine cmd;

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

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

cmd.AddValue(“calculationInterval”, “Interval to calculate buffer rate”, calculationInterval);

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);

Ipv4InterfaceContainer interfaces = address.Assign(devices);

uint16_t port = 9;

ApplicationContainer sinkApps = packetSinkHelper.Install(nodes.Get(1));

sinkApps.Start(Seconds(0.0));

sinkApps.Stop(Seconds(simulationTime));

Ptr<Socket> sourceSocket = Socket::CreateSocket(nodes.Get(0), TypeId::LookupByName(“ns3::UdpSocketFactory”));

// Simulate sending data

Ptr<UniformRandomVariable> var = CreateObject<UniformRandomVariable>();

Simulator::ScheduleWithContext(sourceSocket->GetNode()->GetId(), Seconds(1.0), &GenerateTraffic, sourceSocket, var, 1024, 100);

Simulator::Schedule(calculationInterval, &CalculateBufferRate, DynamicCast<PacketSink>(sinkApps.Get(0)), calculationInterval);

Simulator::Stop(Seconds(simulationTime));

Simulator::Run();

Simulator::Destroy();

return 0;

}

void GenerateTraffic(Ptr<Socket> socket, Ptr<UniformRandomVariable> var, uint32_t pktSize, uint32_t pktCount)

{

if (pktCount > 0)

{

socket->Send(Create<Packet>(pktSize));

Simulator::Schedule(Seconds(var->GetValue(0.05, 0.1)), &GenerateTraffic, socket, var, pktSize, pktCount – 1);

}

}

Explanation:

Here we provide the overall summary to process the buffer rate in ns3:

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 PacketSink application on one node to simulate buffering at the receiving node.
• Created a socket on another node to send packets.
3. Buffer Rate Calculation:
• Implemented the CalculateBufferRate function to calculate the buffer rate by measuring the amount of data received over time.
• Scheduled the buffer rate calculation at regular intervals using the Simulator::Schedule function.
4. Traffic Generation:
• Implemented the GenerateTraffic function to simulate sending data from the source node to the sink node.
5. Running the Simulation:
• The simulation runs, sending and receiving packets.
• The buffer rate is calculated and printed at regular intervals.

Finally, here we discussed about how the buffer rate will compute the data received over time by integrating ns3.

By carrying on performance analysing given to your parameters, we provide you all the information related to your project.