How to Begin Implement Network Transmission Speed in NS3

To implement and examine the Network Transmission Speed in ns-3, follow these steps. Network transmission speed are calculates the rate of that data is successfully has communicated from the sender to a receiver, frequently stated in bits per second (bps).

Steps to Begin Implement Network Transmission Speed in NS3

1. Understand Transmission Speed

Transmission speed can be subjective through:

• Link bandwidth: The physical layer has helps through the maximum data rate.
• Packet size: Larger packets can affect the communication speed due to fragmentation or overhead.
• Latency: It contains the processing, queuing, and broadcast delays.
• Error rate and retransmissions: Improve the overhead and decrease the effective communication speed.

2. Set up Your Environment

Assure the ns-3 is installed and functional. Use the suitable components such as Wi-Fi, Point-to-Point, or LTE according to their environment.

3. Create a Network Topology

Example: Point-to-Point Network

NodeContainer nodes;

nodes.Create(2); // One sender and one receiver

PointToPointHelper pointToPoint;

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

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

NetDeviceContainer devices = pointToPoint.Install(nodes);

4. Set Up the Internet Stack

Install the Internet stack for IP-based communication:

InternetStackHelper stack;

stack.Install(nodes);

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer interfaces = address.Assign(devices);

5. Generate Traffic

for replicate the congestion install applications.

Example: UDP Traffic

UdpEchoServerHelper echoServer(9);

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

serverApps.Start(Seconds(1.0));

serverApps.Stop(Seconds(10.0));

UdpEchoClientHelper echoClient(interfaces.GetAddress(1), 9);

echoClient.SetAttribute(“MaxPackets”, UintegerValue(1000));

echoClient.SetAttribute(“Interval”, TimeValue(Seconds(0.01))); // 10ms interval

echoClient.SetAttribute(“PacketSize”, UintegerValue(1024)); // 1KB packets

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

clientApps.Start(Seconds(2.0));

clientApps.Stop(Seconds(10.0));

6. Measure Transmission Speed

FlowMonitor used to calculate the performance of transmission.

Install FlowMonitor

FlowMonitorHelper flowmon;

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

Simulator::Stop(Seconds(10.0));

Simulator::Run();

monitor->CheckForLostPackets();

Ptr<Ipv4FlowClassifier> classifier = DynamicCast<Ipv4FlowClassifier>(flowmon.GetClassifier());

std::map<FlowId, FlowMonitor::FlowStats> stats = monitor->GetFlowStats();

for (auto& flow : stats) {

double throughput = flow.second.rxBytes * 8.0 / (flow.second.timeLastRxPacket.GetSeconds() – flow.second.timeFirstTxPacket.GetSeconds()); // bps

std::cout << “Flow ” << flow.first << ” Transmission Speed: ” << throughput / 1e6 << ” Mbps\n”;

}

7. Track Sent and Received Packets

Use callbacks to log packets forward and received, and estimate the transmission speed manually.

Count Packets and Bytes

uint64_t bytesSent = 0, bytesReceived = 0;

void PacketSentCallback(Ptr<const Packet> packet) {

bytesSent += packet->GetSize();

}

void PacketReceivedCallback(Ptr<const Packet> packet) {

bytesReceived += packet->GetSize();

}

devices.Get(0)->TraceConnectWithoutContext(“MacTx”, MakeCallback(&PacketSentCallback));

devices.Get(1)->TraceConnectWithoutContext(“MacRx”, MakeCallback(&PacketReceivedCallback));

Calculate Transmission Speed

At the final replication of transmission speed:

Simulator::Schedule(Seconds(10.0), [] {

double transmissionSpeed = bytesReceived * 8.0 / 10.0; // bps (assuming 10s simulation time)

std::cout << “Transmission Speed: ” << transmissionSpeed / 1e6 << ” Mbps\n”;

});

8. Enable Tracing

ASCII and PCAP Tracing

Log packet actions for further analysis:

AsciiTraceHelper ascii;

pointToPoint.EnableAsciiAll(ascii.CreateFileStream(“transmission_speed.tr”));

pointToPoint.EnablePcapAll(“transmission_speed”);

9. Visualize Results

• Distribute the transmission speed data to MATLAB or Excel for graphing.
• Use to visualize packet transmission like as NetAnim:

AnimationInterface anim(“transmission_speed.xml”);

10. Experiment with Parameters

• Bandwidth: Validate by modify the data rates for sample 1Mbps, 10Mbps.
• Packet Size: Designed for following the impact of increase or decrease the packet size.
• Traffic Load: It replicates the high congestion environment through decrease the packet interval.
• Error Models: It determine the error pattern to estimate the effect:

Ptr<RateErrorModel> errorModel = CreateObject<RateErrorModel>();

errorModel->SetAttribute(“ErrorRate”, DoubleValue(0.01)); // 1% error rate

devices.Get(1)->SetAttribute(“ReceiveErrorModel”, PointerValue(errorModel));

11. Run the Simulation

It executes the outcomes for analysis:

Simulator::Run();

Simulator::Destroy();

We demonstrate how to calculate the network transmission speed in ns3 tool that has setup and configure the network model then apply the packet transmission logic then analyse the results. A secondary manual will provide answers to any further questions about this project