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# How to Calculate Sampling Interval in ns3

To calculate sampling interval in ns3, we need to determine the time interval at which some events or metrics are sampled or recorded. This is specifically useful in simulations where we need to monitor and record data periodically, that includes tracking energy consumption, network performance metrics, or other statistics. Here is the detailed explanation on calculating the sampling interval in ns3.

Steps for calculation

1. Set up your ns3 :
• Make sure that ns3 is installed in the computer. If not, install it.
1. Create a new ns3 script :
• In the scratch directory of ns3, create a new script.
1. Include necessary libraries :
• In your script, include the necessary libraries.
1. Define network topology :
• For your network topology, create multiple nodes.
1. Implement Network Size Calculation Logic :
• To sample and record data at specified intervals, use a periodic function.
1. Running the Simulation :
• Define the simulation time and run the simulation.

Example for calculating sampling interval in ns3

Here is the example for the calculation of sampling interval :

#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/applications-module.h”

#include “ns3/energy-module.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“SamplingIntervalExample”);

void SampleEnergy(Ptr<BasicEnergySource> energySource, Time interval)

{

double remainingEnergy = energySource->GetRemainingEnergy();

std::cout << Simulator::Now().GetSeconds() << “s: Remaining energy = ” << remainingEnergy << ” J” << std::endl;

Simulator::Schedule(interval, &SampleEnergy, energySource, interval); // Schedule next sample

}

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

{

uint32_t nNodes = 10; // Number of nodes

double totalTime = 100.0; // Total simulation time in seconds

double sampleInterval = 1.0; // Sampling interval in seconds

CommandLine cmd;

cmd.AddValue(“nNodes”, “Number of nodes”, nNodes);

cmd.AddValue(“totalTime”, “Total simulation time”, totalTime);

cmd.AddValue(“sampleInterval”, “Sampling interval”, sampleInterval);

cmd.Parse(argc, argv);

NodeContainer nodes;

nodes.Create(nNodes);

YansWifiChannelHelper channel = YansWifiChannelHelper::Default();

YansWifiPhyHelper phy = YansWifiPhyHelper::Default();

phy.SetChannel(channel.Create());

WifiHelper wifi = WifiHelper::Default();

wifi.SetRemoteStationManager(“ns3::AarfWifiManager”);

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>();

for (uint32_t i = 0; i < nNodes; ++i)

{

positionAlloc->Add(Vector(rand() % 100, rand() % 100, 0.0)); // Random positions for nodes

}

mobility.SetPositionAllocator(positionAlloc);

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

mobility.Install(nodes);

InternetStackHelper stack;

stack.Install(nodes);

Ipv4InterfaceContainer interfaces = address.Assign(devices);

UdpEchoServerHelper echoServer(9);

ApplicationContainer serverApps = echoServer.Install(nodes.Get(0));

serverApps.Start(Seconds(1.0));

serverApps.Stop(Seconds(totalTime));

echoClient.SetAttribute(“MaxPackets”, UintegerValue(100));

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

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

ApplicationContainer clientApps = echoClient.Install(nodes.Get(nNodes – 1));

clientApps.Start(Seconds(2.0));

clientApps.Stop(Seconds(totalTime));

// Install energy sources and models

BasicEnergySourceHelper basicSourceHelper;

basicSourceHelper.Set(“BasicEnergySourceInitialEnergyJ”, DoubleValue(10000.0));

EnergySourceContainer sources = basicSourceHelper.Install(nodes);

DeviceEnergyModelContainer deviceModels = radioEnergyHelper.Install(devices, sources);

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

{

Ptr<BasicEnergySource> basicSource = DynamicCast<BasicEnergySource>(sources.Get(i));

Simulator::Schedule(Seconds(sampleInterval), &SampleEnergy, basicSource, Seconds(sampleInterval));

}

Simulator::Stop(Seconds(totalTime));

Simulator::Run();

Simulator::Destroy();

return 0;

}

Explanation

1. Nodes and links :

Nodes are created. Wi-Fi network is configured for communication.

1. Mobility :

Random position for the nodes are configured. To keep the nodes stationary, ConstantPositionMobilityModel is used.

1. Applications :

On one node, a UDP echo server is installed. and On another node, a UDP echo server is installed to generate traffic.

1. Energy models :

On the nodes, basic energy sources is installed with an initial energy value. To track energy consumption of Wi-Fi devices, ReportPowerConsumption is used.

1. sampling logic :

To sample and print the remaining energy of each node periodically, SampleEnergy function is implemented. To schedule the sampling function at specified intervals, Simulator::Schedule is used.

1. Running the Simulation :

The simulation runs. and the remaining energy of each node is reported at regular intervals based on the sampling interval.

Overall, we had successfully learned on calculating sampling interval in ns3 by determining the time interval at which certain events or metrics are sampled or recorded. Get more information on sampling interval.

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