How to Calculate Network Connection Loss in ns3

To calculate the connection loss in ns3, which implicates to track the network for example where the association links among nodes is misplaced or disturbed. It is very useful for calculating the reliability of the network across various conditions. Connection loss is a failure to manage the stable connection that indicates by packet losses, failure to send or obtain acknowledgments, or the incompetence to retain a minimum data rate.

ns3simulation.com offer the more information about the behaviour of the connection loss when simulated in different tools.

Here are the procedures on how to calculate the connection loss in ns3:

Steps to Calculate Connection Loss 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., connection_loss_calculation.cc.
3. Include Necessary Headers:
   • Take account of the needed ns3 headers in the script.
4. Define Network Topology:
   • Set up a network topology with multiple nodes.
5. Implement Connection Monitoring:
   • Use applications to simulate traffic and monitor the connection status.
6. Detect Connection Loss:
   • Implement logic to discover and count connection loss events.

Example Code:

Here, we offer the sample snippet to show how to implement the traffic and detect the connection loss in ns3:

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/point-to-point-module.h”

#include “ns3/applications-module.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“ConnectionLossCalculationExample”);

uint32_t connectionLossCount = 0;

bool connectionLost = false;

Time lastReceivedTime = Seconds(0);

Time connectionLossThreshold = Seconds(2); // Threshold to consider a connection lost

void PacketReceiveCallback(Ptr<Socket> socket)

{

Ptr<Packet> packet;

Address from;

while ((packet = socket->RecvFrom(from)))

{

lastReceivedTime = Simulator::Now();

if (connectionLost)

{

connectionLost = false;

std::cout << “Connection restored at ” << Simulator::Now().GetSeconds() << ” seconds” << std::endl;

}

}

}

void CheckConnectionLoss()

{

if (Simulator::Now() – lastReceivedTime > connectionLossThreshold)

{

if (!connectionLost)

{

connectionLost = true;

connectionLossCount++;

std::cout << “Connection lost at ” << Simulator::Now().GetSeconds() << ” seconds” << std::endl;

}

}

Simulator::Schedule(Seconds(1.0), &CheckConnectionLoss); // Schedule next check

}

void GenerateTraffic(Ptr<Socket> socket, uint32_t pktSize, uint32_t pktCount, Time interPacketInterval)

{

if (pktCount > 0)

{

socket->Send(Create<Packet>(pktSize));

Simulator::Schedule(interPacketInterval, &GenerateTraffic, socket, pktSize, pktCount – 1, interPacketInterval);

}

}

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

{

uint32_t nNodes = 2;

double simulationTime = 20.0; // seconds

uint32_t packetSize = 1024; // bytes

uint32_t numPackets = 1000; // number of packets

Time interPacketInterval = MilliSeconds(10); // interval between packets

CommandLine cmd;

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

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

cmd.AddValue(“packetSize”, “Size of each packet”, packetSize);

cmd.AddValue(“numPackets”, “Number of packets to send”, numPackets);

cmd.AddValue(“interPacketInterval”, “Interval between packets”, interPacketInterval);

cmd.Parse(argc, argv);

NodeContainer nodes;

nodes.Create(nNodes);

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute(“DataRate”, StringValue(“5Mbps”));

pointToPoint.SetChannelAttribute(“Delay”, StringValue(“2ms”));

NetDeviceContainer devices;

devices = pointToPoint.Install(nodes);

InternetStackHelper stack;

stack.Install(nodes);

Ipv4AddressHelper address;

address.SetBase(“10.1.1.0”, “255.255.255.0”);

Ipv4InterfaceContainer interfaces = address.Assign(devices);

Ptr<Socket> recvSocket = Socket::CreateSocket(nodes.Get(1), TypeId::LookupByName(“ns3::UdpSocketFactory”));

InetSocketAddress local = InetSocketAddress(Ipv4Address::GetAny(), 9);

recvSocket->Bind(local);

recvSocket->SetRecvCallback(MakeCallback(&PacketReceiveCallback));

Ptr<Socket> sourceSocket = Socket::CreateSocket(nodes.Get(0), TypeId::LookupByName(“ns3::UdpSocketFactory”));

InetSocketAddress remote = InetSocketAddress(interfaces.GetAddress(1), 9);

sourceSocket->Connect(remote);

Simulator::ScheduleWithContext(sourceSocket->GetNode()->GetId(), Seconds(1.0), &GenerateTraffic, sourceSocket, packetSize, numPackets, interPacketInterval);

Simulator::Schedule(Seconds(1.0), &CheckConnectionLoss); // Start connection loss check

Simulator::Stop(Seconds(simulationTime));

Simulator::Run();

Simulator::Destroy();

std::cout << “Total connection loss events: ” << connectionLossCount << std::endl;

return 0;

}

Explanation:

The given below is the description for the process of connection loss in ns3:

1. Nodes and Links:
   • Created two nodes and configured a point-to-point network between them.
   • Set up the network with nodes connected using point-to-point links.
2. Applications:
   • Created UDP sockets on both sender and receiver nodes to simulate traffic.
3. Traffic Generation:
   • Implemented the GenerateTraffic function to send packets from the source node to the sink node at regular intervals.
4. Connection Monitoring:
   • Implemented the PacketReceiveCallback function to update the last received time when a packet is received.
   • Implemented the CheckConnectionLoss function to check if the connection is lost based on the time since the last received packet.
   • Scheduled the connection loss check at regular intervals using the Simulator::Schedule function.
5. Running the Simulation:
   • The simulation runs, sending and receiving packets.
   • Connection loss events are detected and counted based on the defined threshold.

At last, we had learned about the interesting topic connection loss how it’s implemented and calculated in the ns3 simulator.

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