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How to Implement Real Time Protocol in ns3

To implement the Real-Time protocol (RTP) in ns3, we need to make the RTP client and server application to describe the protocol logic and incorporated with ns3 with previous network simulation model.

We share step by procedure on how to implement the RTP in ns3 tool.

Prerequisites

  1. ns-3 Installation: make sure ns3 is installed in the system.
  2. C++ Programming: basic understanding of C++ is needed.
  3. Understanding of ns-3: Familiarity with ns-3 modules and basic simulation scripts.

Steps to Implement RTP in ns-3

  1. Set Up the Development Environment

Make sure that have installed ns3. Download and install ns3 from the official website.

  1. Create a New RTP Module

Navigate to the src directory in ns-3 and create a new directory for your RTP module.

cd ns-3.XX/src

mkdir rtp

cd rtp

mkdir model helper test

3.      Define RTP Classes and Headers

Create header and implementation files for RTP in the model directory.

rtp-server.h

#ifndef RTP_SERVER_H

#define RTP_SERVER_H

#include “ns3/application.h”

#include “ns3/address.h”

#include “ns3/ptr.h”

#include “ns3/socket.h”

#include “ns3/traced-callback.h”

namespace ns3 {

class RtpServer : public Application {

public:

static TypeId GetTypeId (void);

RtpServer ();

virtual ~RtpServer ();

protected:

virtual void StartApplication (void);

virtual void StopApplication (void);

private:

void HandleRead (Ptr<Socket> socket);

void SendRtpPacket (Ptr<Socket> socket);

Ptr<Socket> m_socket;

Address m_local;

EventId m_sendEvent;

};

} // namespace ns3

#endif // RTP_SERVER_H

rtp-server.cc

#include “rtp-server.h”

#include “ns3/log.h”

#include “ns3/simulator.h”

#include “ns3/inet-socket-address.h”

#include “ns3/uinteger.h”

namespace ns3 {

NS_LOG_COMPONENT_DEFINE (“RtpServer”);

NS_OBJECT_ENSURE_REGISTERED (RtpServer);

TypeId RtpServer::GetTypeId (void) {

static TypeId tid = TypeId (“ns3::RtpServer”)

.SetParent<Application> ()

.SetGroupName (“Applications”)

.AddConstructor<RtpServer> ()

.AddAttribute (“Local”, “The Address on which to Bind the rx socket.”,

AddressValue (),

MakeAddressAccessor (&RtpServer::m_local),

MakeAddressChecker ());

return tid;

}

RtpServer::RtpServer () {

NS_LOG_FUNCTION (this);

}

RtpServer::~RtpServer () {

NS_LOG_FUNCTION (this);

}

void RtpServer::StartApplication () {

NS_LOG_FUNCTION (this);

if (m_socket == 0) {

m_socket = Socket::CreateSocket (GetNode (), UdpSocketFactory::GetTypeId ());

m_socket->Bind (m_local);

m_socket->SetRecvCallback (MakeCallback (&RtpServer::HandleRead, this));

}

m_sendEvent = Simulator::Schedule (Seconds (1.0), &RtpServer::SendRtpPacket, this);

}

void RtpServer::StopApplication () {

NS_LOG_FUNCTION (this);

if (m_socket) {

m_socket->Close ();

m_socket->SetRecvCallback (MakeNullCallback<void, Ptr<Socket> > ());

}

Simulator::Cancel (m_sendEvent);

}

void RtpServer::HandleRead (Ptr<Socket> socket) {

NS_LOG_FUNCTION (this << socket);

Ptr<Packet> packet;

Address from;

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

NS_LOG_INFO (“Received request from ” << InetSocketAddress::ConvertFrom (from).GetIpv4 ());

}

}

void RtpServer::SendRtpPacket (Ptr<Socket> socket) {

NS_LOG_FUNCTION (this << socket);

Ptr<Packet> packet = Create<Packet> (1024); // Simulate sending a 1024-byte RTP packet

socket->Send (packet);

NS_LOG_INFO (“Sent RTP packet”);

m_sendEvent = Simulator::Schedule (Seconds (1.0), &RtpServer::SendRtpPacket, this);

}

} // namespace ns3

rtp-client.h

#ifndef RTP_CLIENT_H

#define RTP_CLIENT_H

#include “ns3/application.h”

#include “ns3/address.h”

#include “ns3/ptr.h”

#include “ns3/socket.h”

#include “ns3/traced-callback.h”

namespace ns3 {

class RtpClient : public Application {

public:

static TypeId GetTypeId (void);

RtpClient ();

virtual ~RtpClient ();

protected:

virtual void StartApplication (void);

virtual void StopApplication (void);

private:

void SendRequest ();

void HandleRead (Ptr<Socket> socket);

Ptr<Socket> m_socket;

Address m_peer;

EventId m_sendEvent;

};

} // namespace ns3

#endif // RTP_CLIENT_H

rtp-client.cc

#include “rtp-client.h”

#include “ns3/log.h”

#include “ns3/simulator.h”

#include “ns3/inet-socket-address.h”

#include “ns3/uinteger.h”

namespace ns3 {

NS_LOG_COMPONENT_DEFINE (“RtpClient”);

NS_OBJECT_ENSURE_REGISTERED (RtpClient);

TypeId RtpClient::GetTypeId (void) {

static TypeId tid = TypeId (“ns3::RtpClient”)

.SetParent<Application> ()

.SetGroupName (“Applications”)

.AddConstructor<RtpClient> ()

.AddAttribute (“Remote”, “The Address of the RTP server.”,

AddressValue (),

MakeAddressAccessor (&RtpClient::m_peer),

MakeAddressChecker ());

return tid;

}

RtpClient::RtpClient () {

NS_LOG_FUNCTION (this);

}

RtpClient::~RtpClient () {

NS_LOG_FUNCTION (this);

}

void RtpClient::StartApplication () {

NS_LOG_FUNCTION (this);

if (m_socket == 0) {

m_socket = Socket::CreateSocket (GetNode (), UdpSocketFactory::GetTypeId ());

m_socket->Connect (m_peer);

m_socket->SetRecvCallback (MakeCallback (&RtpClient::HandleRead, this));

m_sendEvent = Simulator::Schedule (Seconds (1.0), &RtpClient::SendRequest, this);

}

}

void RtpClient::StopApplication () {

NS_LOG_FUNCTION (this);

if (m_socket) {

m_socket->Close ();

}

Simulator::Cancel (m_sendEvent);

}

void RtpClient::SendRequest () {

NS_LOG_FUNCTION (this);

std::string request = “REQUEST RTP STREAM\r\n”;

Ptr<Packet> packet = Create<Packet> ((const uint8_t *)request.c_str (), request.size ());

m_socket->Send (packet);

NS_LOG_INFO (“Sent request to server: ” << request);

}

void RtpClient::HandleRead (Ptr<Socket> socket) {

NS_LOG_FUNCTION (this << socket);

Ptr<Packet> packet;

Address from;

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

uint8_t *buffer = new uint8_t[packet->GetSize ()];

packet->CopyData (buffer, packet->GetSize ());

std::string response = std::string ((char *)buffer, packet->GetSize ());

NS_LOG_INFO (“Received response from server: ” << response);

delete[] buffer;

}

}

} // namespace ns3

4.      Create RTP Helper Classes

Create helper classes to facilitate the use and testing of RTP.

rtp-helper.h

#ifndef RTP_HELPER_H

#define RTP_HELPER_H

#include “ns3/application-container.h”

#include “ns3/node-container.h”

#include “ns3/rtp-server.h”

#include “ns3/rtp-client.h”

namespace ns3 {

class RtpServerHelper {

public:

RtpServerHelper (Address address);

ApplicationContainer Install (NodeContainer c);

private:

Ptr<Application> InstallPriv (Ptr<Node> node);

Address m_address;

};

class RtpClientHelper {

public:

RtpClientHelper (Address address);

ApplicationContainer Install (NodeContainer c);

private:

Ptr<Application> InstallPriv (Ptr<Node> node);

Address m_address;

};

} // namespace ns3

#endif // RTP_HELPER_H

rtp-helper.cc

#include “rtp-helper.h”

#include “ns3/uinteger.h”

#include “ns3/names.h”

namespace ns3 {

RtpServerHelper::RtpServerHelper (Address address)

: m_address (address) {

}

ApplicationContainer RtpServerHelper::Install (NodeContainer c) {

ApplicationContainer apps;

for (NodeContainer::Iterator i = c.Begin (); i != c.End (); ++i) {

Ptr<Node> node = *i;

Ptr<Application> app = InstallPriv (node);

apps.Add (app);

}

return apps;

}

Ptr<Application> RtpServerHelper::InstallPriv (Ptr<Node> node) {

Ptr<RtpServer> server = CreateObject<RtpServer> ();

server->SetAttribute (“Local”, AddressValue (m_address));

node->AddApplication (server);

return server;

}

RtpClientHelper::RtpClientHelper (Address address)

: m_address (address) {

}

ApplicationContainer RtpClientHelper::Install (NodeContainer c) {

ApplicationContainer apps;

for (NodeContainer::Iterator i = c.Begin (); i != c.End (); ++i) {

Ptr<Node> node = *i;

Ptr<Application> app = InstallPriv (node);

apps.Add (app);

}

return apps;

}

Ptr<Application> RtpClientHelper::InstallPriv (Ptr<Node> node) {

Ptr<RtpClient> client = CreateObject<RtpClient> ();

client->SetAttribute (“Remote”, AddressValue (m_address));

node->AddApplication (client);

return client;

}

} // namespace ns3

5.      Integrate RTP with ns-3 Build System

Update the wscript file in the src directory to include your new RTP module.

src/rtp/wscript

def build(bld):

module = bld.create_ns3_module(‘rtp’, [‘core’, ‘network’, ‘internet’, ‘applications’])

module.source = [

‘model/rtp-server.cc’,

‘model/rtp-client.cc’,

‘helper/rtp-helper.cc’,

]

headers = bld(features=’ns3header’)

headers.module = ‘rtp’

headers.source = [

‘model/rtp-server.h’,

‘model/rtp-client.h’,

‘helper/rtp-helper.h’,

]

  1. Build and Test
  • Rebuild ns-3 to include your new RTP module.

./waf configure

./waf build

  • Create test scripts to verify the implementation of your RTP protocol.

scratch/test-rtp.cc

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/point-to-point-module.h”

#include “ns3/rtp-helper.h”

using namespace ns3;

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);

RtpServerHelper rtpServer (InetSocketAddress (Ipv4Address::GetAny (), 5004));

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

serverApps.Start (Seconds (1.0));

serverApps.Stop (Seconds (10.0));

RtpClientHelper rtpClient (InetSocketAddress (interfaces.GetAddress (1), 5004));

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

clientApps.Start (Seconds (2.0));

clientApps.Stop (Seconds (10.0));

Simulator::Run ();

Simulator::Destroy ();

return 0;

}

7.      Run and Debug

Run your test script and debug any issues that arise.

./waf –run scratch/test-rtp

Overall we had implemented the Real time protocol in ns3 environment and also we provide further information about real time protocol that can adapt in diverse environment.

Real-Time protocol (RTP) in ns3 are developed by us, to get positive outcomes on programming then contact ns3simulatiobn.com