How to Implement Video Traffic Scheduling in OMNeT++

To implement video traffic scheduling in OMNeT++ has needs to emulate the transmission of video streams over a network and handling how these video packets are scheduled for transmission and this is especially significant in networks where multiple kinds of traffic like video, voice, data compete for limited bandwidth, and quality of service (QoS) necessities must be met. The below are the structured procedures to implement the video traffic scheduling in OMNeT++:

Steps to Implement Video Traffic Scheduling in OMNeT++

1. Install OMNeT++ and INET Framework:
   • Make sure that OMNeT++ and the INET framework are installed. INET delivers the essential components for replicating the network protocols, traffic, and QoS mechanisms.
2. Define the Network Topology:
   • Generate a network topology using a .ned file that contains nodes like servers, routers, clients intricate in video streaming. These nodes will generate, transmit, and receive video traffic.
3. Implement Video Traffic Generation:
   • Improve or use an existing application model to create video traffic. Video traffic is commonly characterized by high bandwidth requirements, variable bit rate (VBR), and sensitivity to latency and jitter.
4. Implement Traffic Scheduling Mechanism:
   • Execute or configure a traffic scheduling mechanism at the router or switch level. Common scheduling techniques like First-Come-First-Served (FCFS), Priority Queuing (PQ), Weighted Fair Queuing (WFQ), and Round Robin (RR).
5. Simulate Video Traffic Scenarios:
   • Setup the scenarios where video traffic is generated and transmitted over the network, probably alongside other kinds of traffic. The scheduling mechanism should prioritize or handle the video traffic to make sure QoS.
6. Configure the Simulation Environment:
   • Use the .ini file to setup parameters like video traffic rates, scheduling policies, link capacities, and QoS requirements.
7. Run the Simulation and Analyse Results:
   • Implement the simulation and evaluate the performance of video traffic scheduling. Key metrics has contained end-to-end delay, jitter, packet loss, and video quality metrics such as PSNR (Peak Signal-to-Noise Ratio).

Example: Implementing Basic Video Traffic Scheduling in OMNeT++

1. Define the Network Topology in a .ned File

// VideoTrafficNetwork.ned

package networkstructure;

import inet.node.inet.StandardHost;

import inet.node.inet.Router;

network VideoTrafficNetwork

{

submodules:

server: StandardHost {

@display(“p=100,200”);

numApps = 1;

app[0].typename = “VideoServerApp”;

}

router: Router {

@display(“p=300,200”);

}

client: StandardHost {

@display(“p=500,200”);

numApps = 1;

app[0].typename = “VideoClientApp”;

}

connections:

server.ethg++ <–> Ethernet100m <–> router.ethg++;

router.ethg++ <–> Ethernet100m <–> client.ethg++;

}

2. Implement Video Traffic Generation

Generate C++ classes for the video server and client applications that mimic the generation and reception of video streams.

#include <omnetpp.h>

#include <inet/applications/base/ApplicationBase.h>

using namespace omnetpp;

using namespace inet;

class VideoServerApp : public ApplicationBase

{

protected:

virtual void initialize(int stage) override;

virtual void handleMessageWhenUp(cMessage *msg) override;

void generateVideoPacket();

public:

virtual int numInitStages() const override { return NUM_INIT_STAGES; }

};

Define_Module(VideoServerApp);

void VideoServerApp::initialize(int stage)

{

ApplicationBase::initialize(stage);

if (stage == INITSTAGE_APPLICATION_LAYER) {

// Schedule initial video packet generation

scheduleAt(simTime() + uniform(0.1, 0.5), new cMessage(“generateVideoPacket”));

}

}

void VideoServerApp::handleMessageWhenUp(cMessage *msg)

{

if (strcmp(msg->getName(), “generateVideoPacket”) == 0) {

generateVideoPacket();

scheduleAt(simTime() + uniform(0.1, 0.5), msg);  // Schedule next video packet

} else {

delete msg;

}

}

void VideoServerApp::generateVideoPacket()

{

EV << “Generating and sending video packet.” << endl;

cPacket *videoPacket = new cPacket(“VideoPacket”);

videoPacket->setByteLength(1500);  // Example packet size

send(videoPacket, “ethg$o”);  // Send the video packet to the router

}

class VideoClientApp : public ApplicationBase

{

protected:

virtual void initialize(int stage) override;

virtual void handleMessageWhenUp(cMessage *msg) override;

public:

virtual int numInitStages() const override { return NUM_INIT_STAGES; }

};

Define_Module(VideoClientApp);

void VideoClientApp::initialize(int stage)

{

ApplicationBase::initialize(stage);

}

void VideoClientApp::handleMessageWhenUp(cMessage *msg)

{

if (cPacket *packet = dynamic_cast<cPacket *>(msg)) {

EV << “Received video packet of size ” << packet->getByteLength() << ” bytes.” << endl;

// Process the video packet (e.g., store it, measure delay, etc.)

delete packet;

} else {

delete msg;

}

}

3. Configure the Traffic Scheduling at the Router

In the .ned file, we can define the router to use a particular scheduling techniques like Priority Queuing (PQ) or Weighted Fair Queuing (WFQ).

simple Router extends inet.node.inet.Router

{

parameters:

@display(“i=device/router”);

numApps = 1;

app[0].typename = “SchedulerApp”;

}

We can also execute a simple scheduler in C++, or configure an existing one in the .ini file.

4. Configure the Simulation in the .ini File

network = networkstructure.VideoTrafficNetwork

sim-time-limit = 300s

# Video traffic settings

*.server.app[0].typename = “VideoServerApp”;

*.client.app[0].typename = “VideoClientApp”;

# Router scheduling settings

*.router.scheduling.typename = “PriorityScheduler”;

# Link capacity and delay settings

*.**.datarate = 100Mbps;

*.**.delay = 2ms;

5. Explanation of the Example

• Network Topology (VideoTrafficNetwork.ned):
  • The network consists of a video server, a router, and a video client. The server creates video traffic, which is routed to the client.
• Video Traffic Generation (VideoServerApp.cc, VideoClientApp.cc):
  • The VideoServerApp emulates video packet generation at the server, while the VideoClientApp manage the reception at the client. The packets are transmitted over the network and can be scheduled at the router.
• Scheduling Mechanism:
  • The scheduling mechanism at the router make sure that video packets are transmitted according to the particular scheduling policy, like priority queuing.

Running the Simulation

• Compile project in OMNeT++ IDE and run the simulation.
• Use OMNeT++’s tools to evaluate how the video traffic is scheduled and transmitted. Focus on parameters such as end-to-end delay, jitter, packet loss, and the effect of various scheduling techniques on video quality.

Extending the Example

• Advanced Scheduling Algorithms: Execute or incoporate more advanced scheduling techniques such as Weighted Fair Queuing (WFQ), Deficit Round Robin (DRR), or Hierarchical Token Bucket (HTB).
• Mixed Traffic Types: Establish other kinds of traffic like VoIP, HTTP and monitor how the scheduling techniques manage mixed traffic with numerous QoS requirements.
• Realistic Video Traffic Models: Execute more realistic video traffic models, that contain variable bit rate (VBR) encoding and bursty traffic patterns.
• QoS Differentiation: Execute QoS-aware scheduling that prioritizes video traffic based on its QoS requirements that make sure that video streams receive preferential treatment.
• Scalability Testing: Increase the number of video streams and measure how the network and scheduling mechanisms manage the increased load.

In the entire page, we understand the procedures to implement the video traffic scheduling in OMNeT++ framework that effectively manage to schedule the traffic over the network. We also provide the detailed information regarding the video traffic scheduling. We are dedicated to assisting scholars with Video Traffic Scheduling in the OMNeT++ tool implementation. Stay connected with us to learn more about this topic, and we are here to support you with performance analysis as well.