How to Begin Implement Network Size in NS3

To implement and study Network Size in ns-3, the aim to replicate the networks by different numbers for nodes and examine their behavior for below various environments such as traffic load, topology, and communication protocols. Here’s a step-by-step guide:

Steps to Begin Implement Network Size in NS3

1. Understand the Concept

Network sizes are suggest the number of nodes or devices in the network. In ns-3, we can:

• Enhance the number of nodes in the NodeContainer.
• Setting the protocols and applications for manage the large-scale communication.
• Study the scalability for performance of the network by parameter metrics such as throughput, latency, packet delivery ratio, etc.

2. Set up Your Environment

Assure we have ns-3 installed and working. Use the suitable version for the project. Familiarize through simple ns-3 scripting in C++ or Python.

3. Create a Large Number of Nodes

Express the number of nodes and build them using the NodeContainer:

NodeContainer nodes;

uint32_t numNodes = 100; // Adjust this for network size

nodes.Create(numNodes);

4. Assign Mobility to Nodes

We replicate the realistic environment; place the nodes are using a mobility pattern:

MobilityHelper mobility;

mobility.SetPositionAllocator(“ns3::RandomRectanglePositionAllocator”,

“X”, StringValue(“ns3::UniformRandomVariable[Min=0.0|Max=500.0]”),

“Y”, StringValue(“ns3::UniformRandomVariable[Min=0.0|Max=500.0]”));

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

mobility.Install(nodes);

For dynamic networks, use mobility components such as RandomWaypointMobilityModel:

mobility.SetMobilityModel(“ns3::RandomWaypointMobilityModel”,

“Speed”, StringValue(“ns3::UniformRandomVariable[Min=1.0|Max=20.0]”),

“Pause”, StringValue(“ns3::ConstantRandomVariable[Constant=2.0]”),

“PositionAllocator”, PointerValue(positionAlloc));

5. Set up a Communication Protocol

Install a network protocol such as Wi-Fi, LTE, or wired communication:

For Wi-Fi:

WifiHelper wifi;

wifi.SetStandard(WIFI_PHY_STANDARD_80211n);

YansWifiPhyHelper phy = YansWifiPhyHelper::Default();

YansWifiChannelHelper channel = YansWifiChannelHelper::Default();

phy.SetChannel(channel.Create());

WifiMacHelper mac;

mac.SetType(“ns3::AdhocWifiMac”);

NetDeviceContainer devices;

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

For LTE:

We can use the LTE component in ns-3 for larger cellular networks.

6. Assign IP Addresses

Use the Internet stack and allocate the IP addresses:

InternetStackHelper stack;

stack.Install(nodes);

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer interfaces = address.Assign(devices);

7. Add Applications

It replicates the network congestion through installing applications:

For Point-to-Point Communication:

uint16_t port = 9;

UdpEchoServerHelper echoServer(port);

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

serverApps.Start(Seconds(1.0));

serverApps.Stop(Seconds(10.0));

UdpEchoClientHelper echoClient(interfaces.GetAddress(0), port);

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

echoClient.SetAttribute(“Interval”, TimeValue(Seconds(0.01)));

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

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

clientApps.Start(Seconds(2.0));

clientApps.Stop(Seconds(10.0));

For Large-Scale Communication:

Use bulk data transfers or arbitrary congestion generators such as OnOffApplication.

8. Scale up Network Size

Test by collective numNodes for examine the impact of network size. Assure the sufficient computational resources for replicate the large-scale.

9. Analyze Network Performance

Gather the parameter metrics for estimate the performance:

• Throughput: Use FlowMonitorHelper.
• Packet Delivery Ratio (PDR).
• End-to-End Delay.
• Packet Loss.

Example:

FlowMonitorHelper flowmon;

Ptr<FlowMonitor> monitor = flowmon.InstallAll();

Simulator::Run();

monitor->SerializeToXmlFile(“flowmon-results.xml”, true, true);

10. Visualize Results

• Use to envision for node positions and transmission like a NetAnim:

AnimationInterface anim(“network_size.xml”);

• Distribute the data for plotting graphs such as MATLAB or Excel.

11. Iterate and Optimize

• Test by several network topologies such as grid, random.
• Alter the application congestion for instance TCP vs. UDP.
• Validate the scalability by different routing protocols for sample AODV, OLSR.

By using the above techniques we had successfully compute the network size over the network in ns3 tool. Queries about the project will be answered in another manual.