How to Implement Interoperability to D2D in OMNeT++

To implement the Interoperability for Device-to-Device (D2D) in OMNeT++, we have to generate a network where the devices can interact directly with one another, detouring out-dated network infrastructure like base stations or access points. This is mostly useful in scenarios like disaster recovery, proximity services, or optimizing cellular network capacity. In the following set up, we provided the implementation steps of Interoperability to D2D in OMNeT++:

Steps to Implement Interoperability for D2D Communication in OMNeT++

Install OMNeT++ and INET Framework:
- Make certain that OMNeT++ and the INET framework are installed. INET provides essential tools for wireless communication, mobility, and routing, which are vital for D2D communication.
Define the Network Topology:
- Develop a network topology using a .ned file, specifying devices that will involve in D2D communication. These devices should be able to switch between infrastructure mode (communicating through a base station) and D2D mode (direct communication).
Implement D2D Communication Mechanism:
- Build or fine-tuning existing protocols to support D2D communication. This could involve customizing routing protocols or generating a new mechanism for devices to explore and link directly with one another.
Enable Interoperability Between D2D and Traditional Networks:
- Execute the logic for devices to switch amongst D2D communication and traditional infrastructure-based communication. This requires a mechanism to define when D2D is more suitable, such as according to the proximity or network congestion.
Simulate Various Scenarios:
- Set up scenarios where devices switch amongst D2D and infrastructure communication based on various triggers like distance, signal strength, or network load.
Configure Simulation Parameters:
- Use the .ini file to configure the parameters for the D2D communication like the range for D2D connections, the conditions under which devices switch modes, and the overall network environment.
Run the Simulation and Analyze Results:
- Implement the simulation and assess the performance of the D2D communication. Key metrics include connection setup time, data transmission efficiency, and the impact on overall network throughput.

Example: Implementing Basic D2D Communication in OMNeT++

Define the Network Topology in a .ned File

// D2DNetwork.ned

package networkstructure;

import inet.node.inet.StandardHost;

import inet.node.inet.Router;

network D2DNetwork

{

submodules:

baseStation: Router {

@display(“p=250,250”);

}

nodeA: StandardHost {

@display(“p=100,100”);

numApps = 1;

app[0].typename = “D2DApp”;

}

nodeB: StandardHost {

@display(“p=400,100”);

numApps = 1;

app[0].typename = “D2DApp”;

}

connections:

nodeA.wlan[0] <–> WirelessChannel <–> baseStation.wlan[0];

nodeB.wlan[0] <–> WirelessChannel <–> baseStation.wlan[1];

}

Implement the D2D Communication Mechanism

Configure a C++ class for a simple D2D application that decides whether to communicate directly or via the base station depends on distance.

#include <omnetpp.h>

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

#include <inet/common/INETMath.h>

using namespace omnetpp;

using namespace inet;

class D2DApp : public ApplicationBase

{

protected:

double d2dRange; // Maximum range for D2D communication

virtual void initialize(int stage) override;

virtual void handleMessageWhenUp(cMessage *msg) override;

bool isInD2DRange();

public:

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

};

Define_Module(D2DApp);

void D2DApp::initialize(int stage)

{

ApplicationBase::initialize(stage);

if (stage == INITSTAGE_APPLICATION_LAYER) {

d2dRange = par(“d2dRange”).doubleValue();

// Schedule initial message or communication attempt

scheduleAt(simTime() + 1, new cMessage(“startCommunication”));

}

void D2DApp::handleMessageWhenUp(cMessage *msg)

{

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

if (isInD2DRange()) {

EV << “Communicating directly with peer via D2D.” << endl;

// Implement D2D communication logic

} else {

EV << “Communicating via base station.” << endl;

// Implement communication via base station

}

delete msg;

} else {

delete msg;

}

bool D2DApp::isInD2DRange()

{

// Simplified distance calculation between two nodes

Coord myPos = getParentModule()->getSubmodule(“mobility”)->par(“initialPosition”);

Coord otherPos = getSimulation()->getModuleByPath(“D2DNetwork.nodeB.mobility”)->par(“initialPosition”);

double distance = myPos.distance(otherPos);

return distance <= d2dRange;

}

Modify Node Modules to Use the D2D Application

Extend the node modules to encompass the D2D application.

simple StandardHost extends inet.node.inet.StandardHost

{

parameters:

@display(“i=device/laptop”);

numApps = 1;

app[0].typename = “D2DApp”;

}

Configure the Simulation in the .ini File

network = networkstructure.D2DNetwork

sim-time-limit = 100s

# D2DApp settings

*.nodeA.app[0].d2dRange = 100m; # Maximum D2D range

*.nodeB.app[0].d2dRange = 100m;

Explanation of the Example

Network Topology (D2DNetwork.ned):
- The network consists of a base station and two nodes (nodeA and nodeB). The nodes are proficient of D2D communication and can decide whether to communicate directly or through the base station.
D2D Communication Logic (D2DApp.cc):
- The D2DApp module states either the nodes are inside the range for D2D communication and picks the proper communication mode. If the nodes are within range, they communicate directly; otherwise, they communicate through the base station.
Simulation Configuration (omnetpp.ini):
- The .ini file sets upthe D2D range, defining the maximum distance within which the nodes can directly communicate.

Running the Simulation

Compile the project in OMNeT++ IDE and run the simulation.
Use OMNeT++’s tools to monitor how the nodes switch amongst D2D and infrastructure-based communication depends on their proximity and evaluate the performance metrics like connection setup time and throughput.

Extending the Example

Dynamic Mobility: Execute dynamic mobility models to observe how nodes move in and out of D2D range and how this influence the communication mode.
Complex D2D Decisions: Expand the D2D decision logic to consider other factors like signal strength, battery life, or network congestion.
Scalability Testing: Increase the number of nodes to examine how well the D2D communication scales and what affect it has on overall network performance.
Interoperability with Multiple Technologies: Implement interoperability amongst various technologies like Wi-Fi Direct and cellular networks, to manage D2D communication.
QoS-aware D2D Communication: Incorporate QoS metrics into the decision-making process to make sure that high-priority traffic is given inclination in D2D communication.

The above procedure presents the entire details on how to implement Interoperability to Device-to-Device (D2D) using INET framework that offers the necessary tools for wireless communication and OMNeT++ is used to integrate the mechanisms into the network.

For enhanced interoperability in D2D within the OMNeT++ implementation, you may consult omnet-manual.com. Our team is available to provide you with excellent project ideas.