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# How to Calculate Communication Range in ns3

To calculate communication range in ns3, this computes the communication range of node that contains the two nodes can successfully interacted with each other to determine at maximum distance. They have numerous factors that are transmission power, antenna gain, propagation loss model, and environmental conditions.

Here, we can compute and visualize the communication range of nodes in ns3 simulation:

Steps to Calculate Communication Range in ns3

1. Set Up ns3 Environment:
• Make certain ns3 is installed.
2. Create a New ns3 Script:
• Create a new script file in the scratch directory of ns3, e.g., communication_range.cc.
• In the script conclude the essential ns3 headers.
4. Define Network Topology:
• Configure a network topology with nodes positioned at various distances.
5. Implement Range Calculation Logic:
• To determine the maximum communication range by use a propagation loss model.
6. Run the Simulation:
• Set the simulation time and run the simulation using Simulator::Run() and Simulator::Destroy().

Example Code:

Here, we provide the sample snippet for Communication Range in ns3:

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/wifi-module.h”

#include “ns3/mobility-module.h”

#include “ns3/propagation-module.h”

#include “ns3/applications-module.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“CommunicationRange”);

double CalculateCommunicationRange(Ptr<Node> nodeA, Ptr<Node> nodeB)

{

Ptr<MobilityModel> mobilityA = nodeA->GetObject<MobilityModel>();

Ptr<MobilityModel> mobilityB = nodeB->GetObject<MobilityModel>();

Vector positionA = mobilityA->GetPosition();

Vector positionB = mobilityB->GetPosition();

return CalculateDistance(positionA, positionB);

}

int main(int argc, char *argv[])

{

uint32_t nNodes = 2;  // Number of nodes

double distance = 100.0;  // Initial distance between nodes

double step = 10.0;  // Step distance to move nodes further apart

CommandLine cmd;

cmd.AddValue(“distance”, “Initial distance between nodes”, distance);

cmd.AddValue(“step”, “Step distance to move nodes further apart”, step);

cmd.Parse(argc, argv);

NodeContainer nodes;

nodes.Create(nNodes);

WifiHelper wifi = WifiHelper::Default();

YansWifiChannelHelper channel = YansWifiChannelHelper::Default();

YansWifiPhyHelper phy = YansWifiPhyHelper::Default();

phy.SetChannel(channel.Create());

WifiMacHelper mac;

Ssid ssid = Ssid(“ns-3-ssid”);

mac.SetType(“ns3::StaWifiMac”, “Ssid”, SsidValue(ssid), “ActiveProbing”, BooleanValue(false));

NetDeviceContainer devices = wifi.Install(phy, mac, nodes);

MobilityHelper mobility;

Ptr<ListPositionAllocator> positionAlloc = CreateObject<ListPositionAllocator>();

positionAlloc->Add(Vector(0.0, 0.0, 0.0));  // Position of the first node

positionAlloc->Add(Vector(distance, 0.0, 0.0));  // Position of the second node

mobility.SetPositionAllocator(positionAlloc);

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

mobility.Install(nodes);

InternetStackHelper stack;

stack.Install(nodes);

UdpEchoServerHelper echoServer(9);

ApplicationContainer serverApps = echoServer.Install(nodes.Get(1));

serverApps.Start(Seconds(1.0));

serverApps.Stop(Seconds(10.0));

echoClient.SetAttribute(“MaxPackets”, UintegerValue(1));

echoClient.SetAttribute(“Interval”, TimeValue(Seconds(1.0)));

echoClient.SetAttribute(“PacketSize”, UintegerValue(1024));

ApplicationContainer clientApps = echoClient.Install(nodes.Get(0));

clientApps.Start(Seconds(2.0));

clientApps.Stop(Seconds(10.0));

Simulator::Stop(Seconds(10.0));

Simulator::Run();

double communicationRange = CalculateCommunicationRange(nodes.Get(0), nodes.Get(1));

std::cout << “Initial Communication Range: ” << communicationRange << “meters” << std::endl;

// Move nodes further apart and check communication range

for (double d = distance + step; d <= 200.0; d += step)

{

Ptr<ConstantPositionMobilityModel> mobB = nodes.Get(1)>GetObject<ConstantPositionMobilityModel>();

mobB->SetPosition(Vector(d, 0.0, 0.0));

Simulator::Stop(Seconds(1.0));

Simulator::Run();

communicationRange = CalculateCommunicationRange(nodes.Get(0), nodes.Get(1));

std::cout << “Distance: ” << d << ” meters, Communication Range: ” << communicationRange << ” meters” << std::endl;

}

Simulator::Destroy();

return 0;

}

Explanation:

The given below are the complete process summary:

• Created two nodes and positioned them initially at a certain distance apart.
2. Wi-Fi Setup:
• Configured the Wi-Fi channel, physical layer, and MAC layer for the nodes.
3. Mobility:
• Set the position of the nodes using the ConstantPositionMobilityModel.
4. Applications:
• Installed a UDP echo server on one node and a UDP echo client on the other node to generate traffic.
5. Communication Range Calculation Logic:
• Implemented a CalculateCommunicationRange function to calculate the distance between two nodes.
• Moved the nodes further apart in steps and checked the communication range at each step.
6. Running the Simulation:
• The simulation runs, and the communication range is calculated and printed for different distances between the nodes.

Finally, we learned how to calculate the Communication Range in ns3 implementation. We also offer the further insights into the performance of the communication range across different simulated tools.

We analyze for the given  parameters and its performance so reach us out for best results.