How to Implement Nearest Antenna Selection in ns3

To implement nearest antenna selection in ns3, depends on the current position of a mobile node, we have to build a mechanism that selects the closest antenna (or access point). In the given below we provided the detailed guide to implementing this feature:

Step 1: Install ns3

Make certain, ns3 is installed in your computer.

Step 2: Create a Custom Helper Class

We need to build a custom helper class that can determine the distance between mobile node and every antenna by executing the nearest antenna selection. Now, select the nearest one.

1. Create a new file, e.g., nearest-antenna-selection-helper.h:

#ifndef NEAREST_ANTENNA_SELECTION_HELPER_H

#define NEAREST_ANTENNA_SELECTION_HELPER_H

#include “ns3/node.h”

#include “ns3/net-device.h”

#include “ns3/mobility-model.h”

#include <vector>

namespace ns3 {

class NearestAntennaSelectionHelper {

public:

NearestAntennaSelectionHelper ();

void AddAntenna (Ptr<Node> antenna);

Ptr<Node> SelectNearestAntenna (Ptr<Node> mobileNode);

private:

std::vector<Ptr<Node>> m_antennas;

};

} // namespace ns3

#endif // NEAREST_ANTENNA_SELECTION_HELPER_H

Create the implementation file, e.g., nearest-antenna-selection-helper.cc:

#include “nearest-antenna-selection-helper.h”

#include “ns3/vector.h”

#include “ns3/mobility-model.h”

#include “ns3/log.h”

namespace ns3 {

NS_LOG_COMPONENT_DEFINE (“NearestAntennaSelectionHelper”);

NearestAntennaSelectionHelper::NearestAntennaSelectionHelper () {}

void

NearestAntennaSelectionHelper::AddAntenna (Ptr<Node> antenna) {

m_antennas.push_back (antenna);

}

Ptr<Node>

NearestAntennaSelectionHelper::SelectNearestAntenna (Ptr<Node> mobileNode) {

Ptr<MobilityModel> mob = mobileNode->GetObject<MobilityModel> ();

Vector mobilePosition = mob->GetPosition ();

Ptr<Node> nearestAntenna = nullptr;

double minDistance = std::numeric_limits<double>::max ();

for (auto antenna : m_antennas) {

Ptr<MobilityModel> antennaMob = antenna->GetObject<MobilityModel> ();

Vector antennaPosition = antennaMob->GetPosition ();

double distance = CalculateDistance (mobilePosition, antennaPosition);

if (distance < minDistance) {

minDistance = distance;

nearestAntenna = antenna;

}

}

return nearestAntenna;

}

} // namespace ns3

Step 3: Integrate the Helper Class into Your Simulation

Use the custom helper class in your simulation script to manage the antenna selection for your mobile nodes.

1. Include the helper header in your simulation script:

#include “nearest-antenna-selection-helper.h”

Create and configure the antennas and mobile nodes:

NodeContainer antennas;

antennas.Create (numberOfAntennas);

NodeContainer mobileNodes;

mobileNodes.Create (numberOfMobileNodes);

// Install mobility models

MobilityHelper mobility;

mobility.SetMobilityModel (“ns3::ConstantPositionMobilityModel”);

mobility.Install (antennas);

mobility.SetMobilityModel (“ns3::RandomWalk2dMobilityModel”,

“Bounds”, RectangleValue (Rectangle (0, 100, 0, 100)));

mobility.Install (mobileNodes);

// Add antennas to the helper

NearestAntennaSelectionHelper antennaHelper;

for (uint32_t i = 0; i < antennas.GetN (); ++i) {

antennaHelper.AddAntenna (antennas.Get (i));

}

// Select nearest antenna for each mobile node

for (uint32_t i = 0; i < mobileNodes.GetN (); ++i) {

Ptr<Node> mobileNode = mobileNodes.Get (i);

Ptr<Node> nearestAntenna = antennaHelper.SelectNearestAntenna (mobileNode);

NS_LOG_UNCOND (“Mobile node ” << i << ” nearest antenna: ” << nearestAntenna->GetId ());

}

Step 4: Compile and Run Your Simulation

Compile your ns3 simulation script using new helper class and run it to see the nearest antenna selection in action.

Example Compilation Command:

./waf configure

./waf build

./waf –run your-simulation-script

Using this script, we can entirely aware of the installation process and how the nearest antenna selection works in the ns3 tool. We will offer any additional details regarding this topic in the near future.

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