How to Implement Network Coding in OMNeT++

To Implement the Network Coding in OMNeT++, we need to simulate the encoding and decoding of data packets to maximize network throughput, consistency and efficiency. It permits intermediate nodes in the network to concatenate packets before forwarding them that can decrease the count of transmission needed and improve the resilience of the network.

In below, we offer the step-by-step guide to implementing network coding in OMNeT++:

Step-by-Step Implementation:

1. Set Up OMNeT++ and INET Framework

• Make certain that OMNeT++ and the INET framework are installed and correctly configured.
• Set up a new project in OMNeT++ and encompass the INET framework that offers the necessary network modules and tools.

2. Design the Network Topology

• Configure the network topology which contains numerous hosts, intermediate nodes (routers or switches) and a destination node in a .ned file. The intermediate node will be accountable for executing the network coding.

Example .ned file:

network NetworkCodingNetwork {

submodules:

source1: StandardHost {

@display(“p=100,200”);

}

source2: StandardHost {

@display(“p=100,300”);

}

relay: StandardHost {

@display(“p=300,250”);

}

destination: StandardHost {

@display(“p=500,250”);

}

router: Router {

@display(“p=300,150”);

}

connections:

source1.ethg++ <–> Ethernet100M <–> relay.ethg++;

source2.ethg++ <–> Ethernet100M <–> relay.ethg++;

relay.ethg++ <–> Ethernet1G <–> destination.ethg++;

source1.ethg++ <–> Ethernet100M <–> router.pppg++;

}

This network consists two source nodes, an intermediate relay node (which will perform network coding), and a destination node.

3. Implement Network Coding Logic

• Execute the network coding logic in the intermediate relay node that will join the packets from the two source nodes and forward the encoded packet to the destination. The destination will then decode the packets to retrieve the original data.

Example of a basic network coding implementation:

class NetworkCodingRelay : public cSimpleModule {

protected:

virtual void initialize() override;

virtual void handleMessage(cMessage *msg) override;

void encodeAndForward(cMessage *msg1, cMessage *msg2);

void decodeAndDeliver(cMessage *msg);

cMessage *bufferedPacket1 = nullptr;

cMessage *bufferedPacket2 = nullptr;

};

void NetworkCodingRelay::initialize() {

// Initialization code, if necessary

}

void NetworkCodingRelay::handleMessage(cMessage *msg) {

if (msg->arrivedOn(“ethg$i”, 0)) {

// Buffer the first packet

bufferedPacket1 = msg;

} else if (msg->arrivedOn(“ethg$i”, 1)) {

// Buffer the second packet

bufferedPacket2 = msg;

}

if (bufferedPacket1 && bufferedPacket2) {

encodeAndForward(bufferedPacket1, bufferedPacket2);

bufferedPacket1 = nullptr;

bufferedPacket2 = nullptr;

}

}

void NetworkCodingRelay::encodeAndForward(cMessage *msg1, cMessage *msg2) {

// Simple XOR-based network coding

cPacket *encodedPacket = new cPacket(“encodedPacket”);

// Assuming the payloads are of the same size for simplicity

std::string payload1 = msg1->getName();

std::string payload2 = msg2->getName();

std::string encodedPayload;

for (size_t i = 0; i < payload1.size(); i++) {

encodedPayload += payload1[i] ^ payload2[i];

}

encodedPacket->setName(encodedPayload.c_str());

send(encodedPacket, “ethg$o”);

}

void NetworkCodingRelay::decodeAndDeliver(cMessage *msg) {

// Decoding logic at the destination (assuming XOR-based coding)

// This part would be implemented in the destination node

}

This instance explains a simple XOR-based network coding at the relay node. The relay node combines two incoming packets by XOR-ing their payloads and forwards the encoded packet to the destination.

4. Configure Traffic Generation

• Create traffic by configuring the source nodes. The traffic generated will be combined by the network coding logic in the relay node.

Example of traffic generation configuration:

*.source1.numApps = 1

*.source1.app[0].typename = “TcpBasicClientApp”

*.source1.app[0].connectAddress = “destination”

*.source1.app[0].connectPort = 80

*.source1.app[0].sendInterval = 1s

*.source1.app[0].messageLength = 1000B

*.source2.numApps = 1

*.source2.app[0].typename = “TcpBasicClientApp”

*.source2.app[0].connectAddress = “destination”

*.source2.app[0].connectPort = 80

*.source2.app[0].sendInterval = 1s

*.source2.app[0].messageLength = 1000B

*.destination.numApps = 1

*.destination.app[0].typename = “TcpBasicServerApp”

This configuration sets up source1 and source2 to send traffic to the destination, which will be relayed and encoded by the relay node.

5. Run the Simulation

• Implement the simulation in OMNeT++ to monitor how the network coding performs. Observe the flow of traffic from the sources over the relay node to the destination, and verify how the network coding impacts the network performance.
• Use OMNeT++’s built-in tools to visualize the traffic flow, validate the encoded packets, and making certain that the destination node successfully decodes the received packets.

6. Analyze the Results

• After running the simulation, assess the efficiency of the network coding. Key metrics to monitor such as throughput, latency, and packet loss. Additionally, analyze how well the network coding improves the efficiency and dependability of the network.
• Check if the destination node appropriately decodes the packets and whether network coding leads to a decrease in the number of transmissions needed.

7. Optimize and Extend

• Based on the analysis, sharpen up the network coding logic to improve performance. This might involve using more sophisticated coding schemes, optimizing the buffer management at the relay node, or modifying the traffic generation parameters.
• Consider extending the simulation to contain more difficult topologies, various kinds of coding (example: linear network coding), or changing network conditions (like high packet loss).
• Discover the influence of network coding on other aspects like network congestion, fairness, or energy efficiency.

Through this demonstration, you will completely gain knowledge about the Network topology and deploy the logic in the intermediate relay node to accomplish the Network Coding in the OMNeT++ environment containing sample codes. If you need any extra information regarding this manual, we will provide it. To seamlessly integrate Network Coding into your OMNeT++ projects, our team stands ready to assist you. Reach out to omnet-manual.com for unparalleled guidance. Discover a wealth of project ideas and simulation insights on Network Coding from our esteemed researchers.