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How to Implement Network Mobility Handoff  in OMNeT++

To implement the network mobility handoff management in OMNeT++ has contains making a scenario where mobile nodes can transfer across several network regions, needing seamless handoff among numerous access points or base stations. It is critical in wireless networks, particularly for maintaining continuous connectivity in situations such as cellular networks, WiFi networks, or merged networks with various Radio Access Technologies (RATs). Given below is a step-by-step approaches with instances to execute network mobility handoff management in OMNeT++ using the INET framework.

Step-by-Step Implementations:

  1. Set Up OMNeT++ and INET Framework:
  • Install OMNeT++: Make sure OMNeT++ is installed and configured on the system.
  • Install INET Framework: Download and install the INET framework, which offers models for wireless networking and mobility.
  1. Define the Network Topology:

Initially, we making a network topology with numerous Access Points (APs) or base stations to which a mobile node can connect. This node will transfer in the network, generating handoffs among these APs.

Example NED File (MobilityHandoffNetwork.ned):

package mynetwork;

import inet.node.inet.AccessPoint;

import inet.node.inet.StandardHost;

import inet.mobility.single.RandomWaypointMobility;

network MobilityHandoffNetwork

{

submodules:

ap1: AccessPoint {

@display(“p=100,100”);

}

ap2: AccessPoint {

@display(“p=300,100”);

}

ap3: AccessPoint {

@display(“p=500,100”);

}

mobileNode: StandardHost {

@display(“p=200,200”);

wlan[0].typename = “IdealWirelessNic”; // WiFi NIC

mobility: <RandomWaypointMobility> {

@display(“p=200,300”);

initialX = 200;

initialY = 200;

speed = uniform(1mps, 2mps);

playgroundSizeX = 600;

playgroundSizeY = 400;

}

}

connections allowunconnected:

mobileNode.wlan[0] <–> wlan[0] <–> ap1.wlan[0];

mobileNode.wlan[0] <–> wlan[0] <–> ap2.wlan[0];

mobileNode.wlan[0] <–> wlan[0] <–> ap3.wlan[0];

}

In this network:

  • ap1, ap2, ap3: Denote three Wi-Fi Access Points.
  • mobileNode: Signifies a mobile node equipped including a WiFi NIC, configured with RandomWaypointMobility to mimic random movement across the network.
  1. Configure Mobility and Handoff Mechanism:

The mobile node’s movement will cause it to transfer closer to among APs over time, needing handoff management to maintain a stable connection. This normally encompasses calculating the signal strength and transferring to a better AP when essential.

Example: Signal Strength-Based Handoff

void MobileNode::handleHandoff() {

double bestSignalStrength = -DBL_MAX;

cModule *bestAp = nullptr;

for (int i = 0; i < numAps; i++) {

double signalStrength = getSignalStrength(aps[i]);

if (signalStrength > bestSignalStrength) {

bestSignalStrength = signalStrength;

bestAp = aps[i];

}

}

if (bestAp && bestAp != currentAp) {

handoffTo(bestAp);

}

}

double MobileNode::getSignalStrength(cModule *ap) {

// Example function to calculate signal strength

return ap->par(“txPower”).doubleValue() – distance(mobileNode, ap);

}

void MobileNode::handoffTo(cModule *ap) {

// Logic to perform handoff

EV << “Handoff to AP: ” << ap->getName() << “\n”;

currentAp = ap;

// Update connection parameters…

}

This code verifies the signal strength of each obtainable AP and activates a handoff to the AP with the strongest signal when essential.

  1. Simulate Packet Transmission During Mobility:

To check the handoff process, we can configure the mobile node to communicate with a server while moving, make sure that packets are effectively transferred even during handoffs.

Example Traffic Configuration in omnetpp.ini:

[General]

network = MobilityHandoffNetwork

**.mobileNode.numApps = 1

**.mobileNode.app[0].typename = “UdpBasicApp”

**.mobileNode.app[0].destAddresses = “server”

**.mobileNode.app[0].destPort = 1234

**.mobileNode.app[0].messageLength = 1024B

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

**.server.numApps = 1

**.server.app[0].typename = “UdpSink”

**.server.app[0].localPort = 1234

In this setup:

  • mobileNode transfers UDP packets to a fixed server.
  • server gets these packets, permitting to observe the success of transmissions during mobility and handoffs.
  1. Monitor and Record Handoff Events:

Use OMNeT++’s recording features to log packet loss, handoff events, and other key metrics that will support measure the act of the handoff mechanism.

Example Configuration for Recording Handoff Events:

[General]

network = MobilityHandoffNetwork

**.mobileNode.wlan[0].mac.handoverCount.recordScalar = true

**.mobileNode.wlan[0].mac.handoverTimes.recordVector = true

This configuration will record the amount of handovers and the times at which they happen.

  1. Run the Simulation and Analyse Results:
  • Run the Simulation: Monitor how the mobile node transfers and how handoffs are handled among the various APs.
  • Analyse the Results: After the simulation, evaluate the packet transmission success, recorded handoff events, and other metrics to evaluate the efficiency of the handoff mechanism.

We can use OMNeT++’s tools to visualize packet flows, handoff events, and signal strength over time.

  1. Advanced Handoff Management Scenarios:

Execute more difficult handoff management scenarios, like:

  • Seamless Handoffs: Reduce packet loss during handoffs by buffering packets or executing make-before-break handoffs.
  • Multi-RAT Handoffs: Incorporate numerous Radio Access Technologies like WiFi and LTE and handle handoffs among them.
  • Load-Aware Handoffs: Integrate network load into the handoff decision to balance the load across APs.

Example: Multi-RAT Handoff

void MobileNode::handleMultiRATHandoff() {

double wifiSignal = getSignalStrength(wifiAp);

double lteSignal = getSignalStrength(lteEnb);

if (wifiSignal > lteSignal && currentRAT != “WiFi”) {

handoffToWiFi();

} else if (lteSignal > wifiSignal && currentRAT != “LTE”) {

handoffToLTE();

}

}

void MobileNode::handoffToWiFi() {

// Logic to switch to WiFi

currentRAT = “WiFi”;

}

void MobileNode::handoffToLTE() {

// Logic to switch to LTE

currentRAT = “LTE”;

}

This code determines how to execute a handoff mechanism among WiFi and LTE depends on signal strength.

  1. Document and Report Findings:

After finishing the simulations, document the results, containing the amount of handoffs, the success rate of packet transmissions, and any packet loss during handoffs. It will support in knowing the performance of the handoff management mechanism.

We had presented about Mobility handoff management concepts, examples, and their approaches are helps to execute the Network Mobility handoff management in OMNeT++ using INET network. If required, we will provide any additional details of this topic with other features.

Omnet-manual.com offers original topics and ideas, plus help with network comparison analysis. If you’re looking to implement Network Mobility Handoff Management in the OMNeT++ tool, we can provide you with top-notch guidance since we have access to all Radio Access Technologies (RATs). We also offer personalized simulation support. Keep connected with omnet-manual.com for excellent advice.

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