To implement the network scheduling cell resources in ns3 has encompasses to configure the LTE module to handle how resources like frequency bands and time slots are distributed to various user equipment (UE) and usually that contains to utilize the MAC scheduler to enhance the resource usage based on numerous conditions such as fairness, throughput, or latency. The given below is the detailed procedure on how to implement the cell resource scheduling in ns3.
Step-by-Step Implementation:
Step 1: Install ns3
Make certain ns3 is installed in the computer.
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, focusing 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 (“NetworkSchedulingExample”);
int main (int argc, char *argv[])
{
// Enable logging
LogComponentEnable (“NetworkSchedulingExample”, 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”); // Proportional Fair scheduler
// 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 Scheduler Type
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 ns3, 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 example, a UDP client and server application is set up to simulate data traffic. The client sends packets to the server at regular intervals.
Step 7: Monitor and Analyze Performance
Use the FlowMonitor module to collect and analyze 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 effect of packet scheduling on network performance. The output will include statistics such as the number of packets transmitted and received, throughput, and any packet loss.
Step 9: Implement Custom Schedulers (Optional)
If you need a custom scheduling algorithm, you can implement it by extending the ns3::FfMacScheduler class and defining your own scheduling logic. Here is a simplified example of how to create a custom scheduler:
#include “ns3/ff-mac-scheduler.h”
namespace ns3 {
class MyCustomScheduler : public FfMacScheduler
{
public:
static TypeId GetTypeId (void);
MyCustomScheduler ();
virtual ~MyCustomScheduler ();
// Override scheduling function
virtual void DoSchedDlTriggerReq (const struct FfMacSchedSapProvider::SchedDlTriggerReqParameters& params);
};
TypeId
MyCustomScheduler::GetTypeId (void)
{
static TypeId tid = TypeId (“ns3::MyCustomScheduler”)
.SetParent<FfMacScheduler> ()
.SetGroupName(“Lte”)
.AddConstructor<MyCustomScheduler> ();
return tid;
}
MyCustomScheduler::MyCustomScheduler ()
{
}
MyCustomScheduler::~MyCustomScheduler ()
{
}
void
MyCustomScheduler::DoSchedDlTriggerReq(conststruct FfMacSchedSapProvider::SchedDlTriggerReqParameters& params)
{
// Custom scheduling logic here
}
} // namespace ns3
Compile your custom scheduler with ns3, and then use it in your simulation script:
lteHelper->SetSchedulerType (“ns3::MyCustomScheduler”);
In the end, we had learned and understand about the network scheduling cell resources is used to manage resources that is to improve the resource usage and allocate the resource to various user equipment that were implemented by ns3 tool. More information will be shared about the network scheduling cell resources and its execution in various simulations.
Look out for some project ideas and performance analysis focused on Network Scheduling Cell Resource using the ns3 tool. We offer a bunch of project concepts and can help you with a detailed comparative analysis of your ideas. We also handle the configuration of the LTE module, so just send us your parameter details!