How to Calculate Network Event Correlation in ns3

To calculate the network event correlation in ns3 has numerous events to simulate that are packet transmissions, receptions, drops, and delays and detecting the relationships or patterns among these events. NEC can help to understand the overall network behaviour, diagnosing issues, and improving network performance, here are the procedures on how to simulate and estimate the network event correlation in ns3:

Steps to Simulate and Calculate Network Event Correlation in ns3

1. Set Up the ns3 Environment:
   • Make sure ns3 is installed a correctly configured.
2. Define the Network Topology:
   • Create a network topology with nodes representing clients, servers, and intermediary nodes like routers or switches.
3. Implement Event Monitoring Mechanisms:
   • Use trace sources or callbacks to monitor events such as packet transmissions, receptions, drops, and delays.
4. Install Applications:
   • Install traffic-generating applications on the nodes to simulate network traffic.
5. Collect and Log Events:
   • Use trace sources or callbacks to collect and log the events.
6. Analyze Event Correlation:
   • Collect and analyze the logged data to identify relationships or patterns among the events.

Example Code

In the below, we demonstrate how to setup a basic ns3 simulation to estimate the network event correlation like logs packet transmissions, receptions, drops, and delays, and then calculates correlations among these events.

#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”

#include “ns3/flow-monitor-module.h”

#include “ns3/packet.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“NetworkEventCorrelationExample”);

std::map<uint32_t, uint64_t> packetsSent;

std::map<uint32_t, uint64_t> packetsReceived;

std::map<uint32_t, uint64_t> packetsDropped;

std::map<uint32_t, double> packetDelays;

void TxCallback (Ptr<const Packet> packet, Ptr<Ipv4> ipv4, uint32_t interface)

{

uint32_t nodeId = ipv4->GetObject<Node>()->GetId();

packetsSent[nodeId]++;

}

void RxCallback (Ptr<const Packet> packet, Ptr<Ipv4> ipv4, uint32_t interface, Time rxTime)

{

uint32_t nodeId = ipv4->GetObject<Node>()->GetId();

packetsReceived[nodeId]++;

Time txTime = packet->GetUid(); // Use packet UID to store the transmission time

packetDelays[nodeId] += (rxTime – txTime).GetSeconds();

}

void DropCallback (Ptr<const Packet> packet, Ptr<Ipv4> ipv4, uint32_t interface)

{

uint32_t nodeId = ipv4->GetObject<Node>()->GetId();

packetsDropped[nodeId]++;

}

void CalculateNetworkEventCorrelation ()

{

NS_LOG_UNCOND (“Network Event Correlation Report:”);

for (auto it = packetsSent.begin (); it != packetsSent.end (); ++it)

{

uint32_t nodeId = it->first;

uint64_t sent = it->second;

uint64_t received = packetsReceived[nodeId];

uint64_t dropped = packetsDropped[nodeId];

double delay = packetDelays[nodeId];

NS_LOG_UNCOND (“Node ” << nodeId << “: Packets Sent = ” << sent << “, Packets Received = ” << received << “, Packets Dropped = ” << dropped << “, Total Delay = ” << delay << ” seconds”);

// Correlation analysis example (simple ratio analysis)

double lossRatio = (double) dropped / sent;

double delayPerPacket = (double) delay / received;

NS_LOG_UNCOND (“Node ” << nodeId << “: Loss Ratio = ” << lossRatio << “, Average Delay per Packet = ” << delayPerPacket << ” seconds”);

}

}

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

{

CommandLine cmd;

cmd.Parse (argc, argv);

Time::SetResolution (Time::NS);

// Create nodes

NodeContainer nodes;

nodes.Create (4); // Two clients and two servers

// Create point-to-point links

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute (“DataRate”, StringValue (“10Mbps”));

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

NetDeviceContainer devices01 = pointToPoint.Install (NodeContainer (nodes.Get (0), nodes.Get (1)));

NetDeviceContainer devices12 = pointToPoint.Install (NodeContainer (nodes.Get (1), nodes.Get (2)));

NetDeviceContainer devices23 = pointToPoint.Install (NodeContainer (nodes.Get (2), nodes.Get (3)));

// Install the internet stack on nodes

InternetStackHelper stack;

stack.Install (nodes);

// Assign IP addresses to the devices

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer interfaces01 = address.Assign (devices01);

address.SetBase (“10.1.2.0”, “255.255.255.0”);

Ipv4InterfaceContainer interfaces12 = address.Assign (devices12);

address.SetBase (“10.1.3.0”, “255.255.255.0”);

Ipv4InterfaceContainer interfaces23 = address.Assign (devices23);

// Enable routing

Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

// Create UDP server on node 2 and node 3

UdpServerHelper server (9);

ApplicationContainer serverApp1 = server.Install (nodes.Get (2));

ApplicationContainer serverApp2 = server.Install (nodes.Get (3));

serverApp1.Start (Seconds (1.0));

serverApp1.Stop (Seconds (10.0));

serverApp2.Start (Seconds (1.0));

serverApp2.Stop (Seconds (10.0));

// Create UDP client on node 0 and node 1

UdpClientHelper client1 (interfaces12.GetAddress (1), 9);

client1.SetAttribute (“MaxPackets”, UintegerValue (320));

client1.SetAttribute (“Interval”, TimeValue (MilliSeconds (10)));

client1.SetAttribute (“PacketSize”, UintegerValue (1024));

UdpClientHelper client2 (interfaces23.GetAddress (1), 9);

client2.SetAttribute (“MaxPackets”, UintegerValue (320));

client2.SetAttribute (“Interval”, TimeValue (MilliSeconds (10)));

client2.SetAttribute (“PacketSize”, UintegerValue (1024));

ApplicationContainer clientApp1 = client1.Install (nodes.Get (0));

ApplicationContainer clientApp2 = client2.Install (nodes.Get (1));

clientApp1.Start (Seconds (2.0));

clientApp1.Stop (Seconds (10.0));

clientApp2.Start (Seconds (2.0));

clientApp2.Stop (Seconds (10.0));

// Trace packet transmission, reception, drops, and delays

Config::ConnectWithoutContext (“/NodeList/*/ApplicationList/*/$ns3::UdpClient/Tx”, MakeCallback (&TxCallback));

Config::ConnectWithoutContext (“/NodeList/*/ApplicationList/*/$ns3::UdpServer/Rx”, MakeCallback (&RxCallback));

Config::ConnectWithoutContext (“/NodeList/*/DeviceList/*/Drop”, MakeCallback (&DropCallback));

// Install flow monitor to capture performance metrics

FlowMonitorHelper flowHelper;

Ptr<FlowMonitor> flowMonitor = flowHelper.InstallAll ();

Simulator::Stop (Seconds (11.0));

Simulator::Run ();

CalculateNetworkEventCorrelation ();

Simulator::Destroy ();

return 0;

}

Explanation

1. Setup: The code sets up a network topology with four nodes: two clients and two servers, connected by point-to-point links.
2. Internet Stack and Routing: The internet stack is installed on all nodes, and global routing is enabled.
3. Applications: UDP servers are installed on the server nodes (nodes 2 and 3), and UDP clients are installed on the client nodes (nodes 0 and 1) to generate traffic.
4. Event Monitoring: The TxCallback, RxCallback, and DropCallback functions are connected to trace packet transmissions, receptions, drops, and delays. These functions update counters for each node and log relevant information.
5. Network Event Correlation Calculation: The CalculateNetworkEventCorrelation function logs the number of packets sent, received, and dropped by each node, as well as the total delay. It then calculates simple correlation metrics, such as the loss ratio and average delay per packet.

Running the Simulation

Compile and run the simulation using the following commands in your ns3 environment:

./waf configure

./waf build

./waf –run your-script-name

Replace your-script-name with the actual name of your script file.

In the end, we learned and understand how the network event correlation will estimated in the ns3 framework. We will give further insights regarding to network event correlation how it works in diverse simulation tools. Share with ns3simulation.com all your parameters’ details related to Network Event Correlation we will provide you with novel results. Looking for experts to guide in project performance  , then reach out to our experts.