How to Calculate Application Response Time in ns3

To calculate an Application Response Time in ns3, when sending a request this implicates to measure the time that takes for an application to obtain a response. This metric is vital for estimating the performance of applications particularly in client-server models.

Here is the step by procedures on how to implement the Application response time in ns3:

Steps to Calculate Application Response Time in ns-3

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., application_response_time.cc.
3. Include Necessary Headers:
   • In the script conclude all the required ns3 headers.
4. Define Network Topology:
   • Use multiple nodes to configure the network topology.
5. Simulate Client-Server Communication:
   • Use UdpEchoServer and UdpEchoClient applications to simulate request-response communication.
6. Measure Application Response Time:
   • Track the time it takes for the client to receive a response after sending a request.

Example Code:

The given below is the sample to complete the script for Application Response Time 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 (“ApplicationResponseTimeExample”);

class MyApp : public Application

{

public:

MyApp ();

virtual ~MyApp();

void Setup (Ptr<Socket> socket, Address address, uint32_t packetSize, uint32_t nPackets, Time pktInterval);

void ScheduleTx (void);

void SendPacket (void);

void ReceivePacket (Ptr<Socket> socket);

private:

virtual void StartApplication (void);

virtual void StopApplication (void);

Ptr<Socket>     m_socket;

Address         m_peer;

uint32_t        m_packetSize;

uint32_t        m_nPackets;

Time            m_pktInterval;

EventId         m_sendEvent;

bool            m_running;

uint32_t        m_packetsSent;

};

MyApp::MyApp ()

: m_socket (0),

m_peer (),

m_packetSize (0),

m_nPackets (0),

m_pktInterval (Seconds (0)),

m_sendEvent (),

m_running (false),

m_packetsSent (0)

{

}

MyApp::~MyApp()

{

m_socket = 0;

}

void

MyApp::Setup (Ptr<Socket> socket, Address address, uint32_t packetSize, uint32_t nPackets, Time pktInterval)

{

m_socket = socket;

m_peer = address;

m_packetSize = packetSize;

m_nPackets = nPackets;

m_pktInterval = pktInterval;

}

void

MyApp::StartApplication (void)

{

m_running = true;

m_packetsSent = 0;

m_socket->Bind();

m_socket->Connect (m_peer);

m_socket->SetRecvCallback (MakeCallback (&MyApp::ReceivePacket, this));

SendPacket();

}

void

MyApp::StopApplication (void)

{

m_running = false;

if (m_sendEvent.IsRunning ())

{

Simulator::Cancel (m_sendEvent);

}

if (m_socket)

{

m_socket->Close ();

}

}

void

MyApp::SendPacket (void)

{

Ptr<Packet> packet = Create<Packet> (m_packetSize);

m_socket->Send (packet);

if (++m_packetsSent < m_nPackets)

{

ScheduleTx ();

}

}

void

MyApp::ScheduleTx (void)

{

if (m_running)

{

m_sendEvent = Simulator::Schedule (m_pktInterval, &MyApp::SendPacket, this);

}

}

void

MyApp::ReceivePacket (Ptr<Socket> socket)

{

Ptr<Packet> packet;

Address from;

while ((packet = socket->RecvFrom (from)))

{

NS_LOG_UNCOND (“Received one packet!”);

}

}

int

main (int argc, char *argv[])

{

CommandLine cmd;

cmd.Parse (argc, argv);

NodeContainer nodes;

nodes.Create (2);

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;  // 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));

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

echoClient.SetAttribute (“MaxPackets”, UintegerValue (1));

echoClient.SetAttribute (“Interval”, TimeValue (Seconds (1.0)));

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

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

clientApps.Start (Seconds (2.0));

clientApps.Stop (Seconds (10.0));

Simulator::Run ();

Simulator::Destroy ();

return 0;

}

Explanation:

Here, we provide structures process for Application Response Time in ns3:

1. Nodes and Links:
   • Created two nodes and configured a point-to-point network between them.
   • Set up the network with nodes connected using point-to-point links.
2. Applications:
   • Used UdpEchoServerHelper and UdpEchoClientHelper to set up an echo server and client to simulate request-response communication.
   • Configured the echo client to send one packet per second to the echo server.
3. Measure Response Time:
   • The UdpEchoClient application will send packets to the UdpEchoServer, which will echo them back.
   • The time taken for the client to receive a response after sending a request is the application response time.

At last, we had implemented and evaluated the Application Response Time in ns3 tool successfully. We provide additional support on how the Application Response Time behaves in other simulation tool.

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