How to Implement Network Telepresence in ns3

To implement the network telepresence in ns3 has includes to emulate the network that supports high-quality, real-time audio and video communication, that same as a video conferencing system nevertheless frequently with additional stringent necessities for latency and quality. Here, we provide the detailed procedures on how to implement the network telepresence in ns3:

Step-by-Step Implementation:

Step 1: Setup ns3 Environment

Make sure ns3 is installed in the system.

Step 2: Include Necessary Modules

Include the necessary ns3 modules in your script:

#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”

Step 3: Create the Simulation Script

1. Setup Nodes and Network:

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“NetworkTelepresenceExample”);

 

class TelepresenceApplication : public Application

{

public:

TelepresenceApplication ();

virtual ~TelepresenceApplication ();

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

private:

virtual void StartApplication (void);

virtual void StopApplication (void);

void ScheduleTx (void);

void SendPacket (void);

Ptr<Socket>     m_socket;

Address         m_peer;

uint32_t        m_packetSize;

uint32_t        m_nPackets;

DataRate        m_dataRate;

EventId         m_sendEvent;

bool            m_running;

uint32_t        m_packetsSent;

};

TelepresenceApplication::TelepresenceApplication ()

: m_socket (0),

m_peer (),

m_packetSize (0),

m_nPackets (0),

m_dataRate (0),

m_sendEvent (),

m_running (false),

m_packetsSent (0)

{

}

TelepresenceApplication::~TelepresenceApplication ()

{

m_socket = 0;

}

void

TelepresenceApplication::Setup (Ptr<Socket> socket, Address address, uint32_t packetSize, uint32_t nPackets, DataRate dataRate)

{

m_socket = socket;

m_peer = address;

m_packetSize = packetSize;

m_nPackets = nPackets;

m_dataRate = dataRate;

}

void

TelepresenceApplication::StartApplication (void)

{

m_running = true;

m_packetsSent = 0;

m_socket->Bind ();

m_socket->Connect (m_peer);

SendPacket ();

}

void

TelepresenceApplication::StopApplication (void)

{

m_running = false;

if (m_sendEvent.IsRunning ())

{

Simulator::Cancel (m_sendEvent);

}

if (m_socket)

{

m_socket->Close ();

}

}

void

TelepresenceApplication::SendPacket (void)

{

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

m_socket->Send (packet);

if (++m_packetsSent < m_nPackets)

{

ScheduleTx ();

}

}

void

TelepresenceApplication::ScheduleTx (void)

{

if (m_running)

{

Time tNext (Seconds (m_packetSize * 8 / static_cast<double> (m_dataRate.GetBitRate ())));

m_sendEvent = Simulator::Schedule (tNext, &TelepresenceApplication::SendPacket, this);

}

}

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

{

CommandLine cmd;

cmd.Parse (argc, argv);

// Create nodes

NodeContainer nodes;

nodes.Create (4);

// Create point-to-point links

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute (“DataRate”, StringValue (“100Mbps”));

pointToPoint.SetChannelAttribute (“Delay”, StringValue (“1ms”));

NetDeviceContainer devices;

devices = pointToPoint.Install (NodeContainer (nodes.Get (0), nodes.Get (1)));

devices.Add (pointToPoint.Install (NodeContainer (nodes.Get (1), nodes.Get (2))));

devices.Add (pointToPoint.Install (NodeContainer (nodes.Get (2), nodes.Get (3))));

// 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 applications

uint16_t port = 5000;  // Telepresence port

// Server application on node 3

Address serverAddress (InetSocketAddress (Ipv4Address::GetAny (), port));

PacketSinkHelper packetSinkHelper (“ns3::UdpSocketFactory”, serverAddress);

ApplicationContainer sinkApps = packetSinkHelper.Install (nodes.Get (3));

sinkApps.Start (Seconds (1.0));

sinkApps.Stop (Seconds (20.0));

// Client application on node 0

Ptr<Socket> source = Socket::CreateSocket (nodes.Get (0), UdpSocketFactory::GetTypeId ());

Address remoteAddress (InetSocketAddress (interfaces.GetAddress (3), port));

Ptr<TelepresenceApplication> app = CreateObject<TelepresenceApplication> ();

app->Setup (source, remoteAddress, 1024, 10000, DataRate (“10Mbps”));

nodes.Get (0)->AddApplication (app);

app->SetStartTime (Seconds (2.0));

app->SetStopTime (Seconds (20.0));

// Set up a second client to simulate a telepresence session

Ptr<Socket> source2 = Socket::CreateSocket (nodes.Get (1), UdpSocketFactory::GetTypeId ());

Ptr<TelepresenceApplication> app2 = CreateObject<TelepresenceApplication> ();

app2->Setup (source2, remoteAddress, 1024, 10000, DataRate (“10Mbps”));

nodes.Get (1)->AddApplication (app2);

app2->SetStartTime (Seconds (2.0));

app2->SetStopTime (Seconds (20.0));

Simulator::Stop (Seconds (20.0));

Simulator::Run ();

Simulator::Destroy ();

return 0;

}

Step 4: Run the Simulation

Compile and run your simulation script:

sh

./waf configure

./waf build

./waf –run NetworkTelepresenceExample

Explanation

• Node Creation: Create nodes representing different devices in the network.
• Point-to-Point Links: Configure point-to-point links between nodes with high data rates and low latency to simulate a telepresence environment.
• Internet Stack: Install the Internet stack on all nodes.
• IP Configuration: Assign IP addresses to the interfaces.
• Applications: Implement a custom application (TelepresenceApplication) that simulates telepresence traffic by sending packets over UDP.
• Traffic Generation: Use the custom TelepresenceApplication to generate telepresence traffic from client nodes to a server node, simulating a telepresence session.

Advanced Telepresence Techniques

1. Simulating Different Video Resolutions:

Adjust the packetSize and dataRate to simulate different video resolutions.

// Simulate HD video

app->Setup (source, remoteAddress, 2048, 10000, DataRate (“20Mbps”));

1. Quality of Service (QoS):

Implement QoS mechanisms to prioritize telepresence traffic.

TrafficControlHelper tch;

tch.SetRootQueueDisc (“ns3::FqCoDelQueueDisc”);

tch.Install (devices);

1. Monitoring Performance:

Use the FlowMonitor module to analyze the performance of the telepresence traffic.

FlowMonitorHelper flowmon;

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

 

// At the end of the simulation

monitor->SerializeToXmlFile (“telepresence-flowmon-results.xml”, true, true);

1. Simulating Packet Loss:

Introduce packet loss to simulate real-world network conditions.

Ptr<RateErrorModel> em = CreateObject<RateErrorModel> ();

em->SetAttribute (“ErrorRate”, DoubleValue (0.01));  // 1% packet loss

devices.Get (1)->SetReceiveErrorModel (em);

1. Simulating Multiple Streams:

Add multiple client applications to simulate a telepresence session with more participants.

Ptr<Socket> source3 = Socket::CreateSocket (nodes.Get (2), UdpSocketFactory::GetTypeId ());

Ptr<TelepresenceApplication> app3 = CreateObject<TelepresenceApplication> ();

app3->Setup (source3, remoteAddress, 1024, 10000, DataRate (“10Mbps”));

nodes.Get (2)->AddApplication (app3);

app3->SetStartTime (Seconds (2.0));

app3->SetStopTime (Seconds (20.0));

As we discussed earlier about how the network telepresence will perform in ns3 tool and we help to provide further information about how the network telepresence will adapt in different simulation.

Implementation of  Network Telepresence in the ns3 program, where enabling high-quality, real-time audio and video communication for your projects are carried out by our developers. Connect with us to ensure your success.