How to Calculate Network Service Rate in Ns3

To calculate the network service rate in ns3, we need to follow some steps to measure the amount of data delivered in a given time period over a network. The following steps will guide on how to calculate Network Service Rate in ns3.

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Step-by-Step Guide to Calculate Network Service Rate in ns3

1. Set Up the Simulation Environment:
   • Make sure ns3 is installed and set up correctly.
   • Include necessary modules for the simulation (e.g., Internet, PointToPoint).
2. Create Network Topology:
   • Define nodes, devices, and channels.
   • Set up IP addressing and routing.
3. Configure Applications:
   • Install traffic generating applications (e.g., UDP, TCP) on the nodes.
4. Enable Tracing:
   • Enable tracing to capture the packets and measure the data rate.
5. Run the Simulation:
   • Execute the simulation and collect the trace data.
6. Analyze the Results:
   • Post-process the trace data to calculate the service rate.

Example Code Snippet

Here’s a simple example of how to set up a basic point-to-point network, generate traffic, and calculate the service rate:

#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;

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

{

// Set up logging

LogComponentEnable (“UdpEchoClientApplication”, LOG_LEVEL_INFO);

LogComponentEnable (“UdpEchoServerApplication”, LOG_LEVEL_INFO);

// Create nodes

NodeContainer nodes;

nodes.Create (2);

// Set up point-to-point connection

PointToPointHelper pointToPoint;

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

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

// Install devices and channels

NetDeviceContainer devices;

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);

// Set up UDP server on node 1

UdpEchoServerHelper echoServer (9);

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

serverApps.Start (Seconds (1.0));

serverApps.Stop (Seconds (10.0));

// Set up UDP client on node 0

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

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

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));

// Set up FlowMonitor

FlowMonitorHelper flowmon;

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

// Run the simulation

Simulator::Stop (Seconds (11.0));

Simulator::Run ();

// Print per-flow 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);

NS_LOG_UNCOND (“Flow ” << i->first << ” (” << t.sourceAddress << ” -> ” << t.destinationAddress << “)”);

NS_LOG_UNCOND (”  Tx Bytes:   ” << i->second.txBytes);

NS_LOG_UNCOND (”  Rx Bytes:   ” << i->second.rxBytes);

NS_LOG_UNCOND (”  Duration:   ” << i->second.timeLastRxPacket.GetSeconds () – i->second.timeFirstTxPacket.GetSeconds ());

NS_LOG_UNCOND (”  Throughput: ” << i->second.rxBytes * 8.0 /

(i->second.timeLastRxPacket.GetSeconds () – i->second.timeFirstTxPacket.GetSeconds ()) / 1000 / 1000  << ” Mbps”);

}

// Clean up

Simulator::Destroy ();

return 0;

}

Explanation:

1. Setup Logging:
   • Enable logging for the UDP applications to track their activities.
2. Create Nodes and Network:
   • Two nodes connected with a point-to-point link.
   • Configure the link’s data rate and delay.
3. Install Network Stack:
   • Install the Internet stack on both nodes.
   • Assign IP addresses to the devices.
4. Configure Applications:
   • Install a UDP echo server on node 1.
   • Install a UDP echo client on node 0, configured to send packets to the server.
5. Flow Monitor:
   • Set up a FlowMonitor to collect and analyze flow statistics.
6. Run Simulation:
   • Run the simulation for the specified duration.
7. Calculate Service Rate:
   • After the simulation, extract the flow statistics.
   • Calculate the throughput using the received bytes and the duration of the flow.

Calculating Throughput:

Throughput is calculated as: Throughput=RxBytes×8Duration\text{Throughput} = \frac{\text{RxBytes} \times 8}{\text{Duration}}Throughput=DurationRxBytes×8​ where:

• RxBytes\text{RxBytes}RxBytes is the total number of received bytes.
• Duration\text{Duration}Duration is the time from the first transmitted packet to the last received packet.

From the above step we get to know how to calculate Network service rate by measuring the amount of data successfully delivered over a network in a given period of time.