How to Implement Network Packet scheduling in ns3

To implement the network packet scheduling in ns3 has implicates the scheduling mechanism that were utilized by network nodes such as base stations in LTE that regulate how packets are transferred over the network. This includes using the existing scheduling techniques or executes the custom ones. The given below is the detailed procedure on how to implement the packet scheduling in an ns3 simulation, specifically using the LTE module.

Step-by-Step Implementation:

Step 1: Install ns3

Make sure ns3 is installed in the system.

Step 2: Set Up the Simulation Environment

Create a new simulation script or modify an existing one. This script will define the network topology, nodes, and communication channels.

Step 3: Define Network Topology

Create nodes and define the network topology, concentrate on eNodeBs and UEs. Here’s an example of setting up an LTE network with a basic packet scheduling configuration.

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/mobility-module.h”

#include “ns3/lte-module.h”

#include “ns3/applications-module.h”

#include “ns3/flow-monitor-module.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“NetworkPacketSchedulingExample”);

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

{

// Enable logging

LogComponentEnable (“NetworkPacketSchedulingExample”, LOG_LEVEL_INFO);

// Create nodes

NodeContainer ueNodes;

ueNodes.Create (20); // Example with 20 user equipment nodes

NodeContainer enbNodes;

enbNodes.Create (3); // Example with 3 eNodeB nodes (base stations)

// Set up LTE and EPC (Evolved Packet Core)

Ptr<LteHelper> lteHelper = CreateObject<LteHelper> ();

Ptr<PointToPointEpcHelper> epcHelper = CreateObject<PointToPointEpcHelper> ();

lteHelper->SetEpcHelper (epcHelper);

// Configure scheduler type (e.g., PF, RR, FDBET)

lteHelper->SetSchedulerType (“ns3::PfFfMacScheduler”);

// Install LTE Devices to the nodes

NetDeviceContainer enbLteDevs = lteHelper->InstallEnbDevice (enbNodes);

NetDeviceContainer ueLteDevs = lteHelper->InstallUeDevice (ueNodes);

// Install the IP stack on the UEs

InternetStackHelper internet;

internet.Install (ueNodes);

// Assign IP addresses to UEs

Ipv4InterfaceContainer ueIpIface;

ueIpIface = epcHelper->AssignUeIpv4Address (NetDeviceContainer (ueLteDevs));

// Attach UEs to the eNodeBs

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

{

lteHelper->Attach (ueLteDevs.Get (i), enbLteDevs.Get (i % enbNodes.GetN ()));

}

// Set mobility model

MobilityHelper mobility;

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

mobility.Install (enbNodes);

mobility.SetPositionAllocator (“ns3::RandomBoxPositionAllocator”,

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

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

“Z”, StringValue (“ns3::UniformRandomVariable[Min=0.0|Max=1.5]”));

mobility.SetMobilityModel (“ns3::RandomWaypointMobilityModel”,

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

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

“PositionAllocator”, StringValue (“ns3::RandomBoxPositionAllocator”));

mobility.Install (ueNodes);

// Install and start applications on UEs and remote host

uint16_t dlPort = 1234;

ApplicationContainer clientApps;

ApplicationContainer serverApps;

UdpClientHelper dlClient (ueIpIface.GetAddress (0), dlPort);

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

dlClient.SetAttribute (“MaxPackets”, UintegerValue (1000000));

clientApps.Add (dlClient.Install (ueNodes.Get (0)));

PacketSinkHelper dlPacketSinkHelper (“ns3::UdpSocketFactory”, InetSocketAddress (Ipv4Address::GetAny (), dlPort));

serverApps.Add (dlPacketSinkHelper.Install (ueNodes.Get (0)));

serverApps.Start (Seconds (0.01));

clientApps.Start (Seconds (0.01));

// Set up FlowMonitor

FlowMonitorHelper flowmon;

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

// Set up the simulation

Simulator::Stop (Seconds (10.0));

Simulator::Run ();

// Print statistics

monitor->CheckForLostPackets ();

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

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

for (std::map<FlowId, FlowMonitor::FlowStats>::const_iterator i = stats.begin (); i != stats.end (); ++i)

{

Ipv4FlowClassifier::FiveTuple t = classifier->FindFlow (i->first);

NS_LOG_UNCOND (“Flow” << i->first << ” (” << t.sourceAddress << ” -> ” << t.destinationAddress << “)”);

NS_LOG_UNCOND (“Tx Packets:” << i->second.txPackets);

NS_LOG_UNCOND (“Tx Bytes:” << i->second.txBytes);

NS_LOG_UNCOND (“Rx Packets:” << i->second.rxPackets);

NS_LOG_UNCOND (“Rx Bytes:” << i->second.rxBytes);

NS_LOG_UNCOND (” Throughput: ” << i->second.rxBytes * 8.0 / (i->second.timeLastRxPacket.GetSeconds () – i->second.timeFirstTxPacket.GetSeconds ()) / 1024 / 1024  << ” Mbps”);

}

// Clean up

Simulator::Destroy ();

return 0;

}

Step 4: Configure the Packet Scheduler

In the above example, the scheduler type is configured using lteHelper->SetSchedulerType (“ns3::PfFfMacScheduler”);. You can replace “ns3::PfFfMacScheduler” with other scheduling algorithms provided by ns-3, such as:

• “ns3::RrFfMacScheduler” for Round Robin scheduling.
• “ns3::TtaFfMacScheduler” for Throughput to Average scheduling.
• “ns3::FdBetFfMacScheduler” for Frequency Domain Best Effort scheduling.

Step 5: Set Up Mobility Models

In the example, the RandomWaypointMobilityModel is used for UEs to simulate movement. The mobility model and parameters (speed, pause, position) can be adjusted as needed.

Step 6: Set Up Traffic Generation

In the illustration, a UDP client and server application is set up to simulate data traffic. The client guides packets to the server at regular intervals.

Step 7: Monitor and Analyse Performance

Use the FlowMonitor module to collect and analyse performance metrics such as throughput, packet loss, and delay. This information is printed out at the end of the simulation.

Step 8: Run the Simulation

Compile and run your simulation script to see the consequence of packet scheduling on network performance. The output will conclude statistics like the number of packets transmitted and received throughput, and any packet loss.

Finally we had clearly understood how the network packet scheduling performs in base station in LTE that transfers the packets over the network by using the ns3 tools. We will also provide the further insights related to network packet scheduling.

At ns3simulation.com will handle the implementation of Network Packet scheduling in ns3simulation. We specialize in conducting comparison analytics for research projects, ensuring the best possible outcome with a detailed explanation. Whether you need help with scheduling techniques or custom executions, just let us know your requirements for top-notch support.