To implement the spectrum and power allocation in ns3 has essential to setup a network then based on the certain conditions where resources like spectrum and power are distributed vigorously to the users. This is very usual in cognitive radio networks (CRNs) and cellular networks where effective use of spectrum and power is vital. The given below is the complete procedure on how to implement the spectrum and power allocation in ns3:
Step-by-Step Implementation:
Step 1: Install ns3
Make certain ns3 is installed on 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, mobility models, and communication protocols.
Step 3: Define Network Topology
Create nodes and define the network topology, including base stations and user devices.
#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/point-to-point-helper.h”
#include “ns3/flow-monitor-module.h”
using namespace ns3;
NS_LOG_COMPONENT_DEFINE (“SpectrumPowerAllocationExample”);
void SetPowerAndSpectrumAllocation (Ptr<LteHelper> lteHelper, NetDeviceContainer enbDevs, NetDeviceContainer ueDevs)
{
// Example of setting transmit power and spectrum allocation
for (uint32_t i = 0; i < enbDevs.GetN (); ++i)
{
Ptr<LteEnbNetDevice> enb = enbDevs.Get (i)->GetObject<LteEnbNetDevice> ();
enb->GetPhy ()->SetTxPower (30); // Set transmit power to 30 dBm
// Allocate spectrum (this is a simple example, real allocation would be dynamic)
enb->GetPhy ()->SetDlEarfcn (100); // Set downlink EARFCN
enb->GetPhy ()->SetUlEarfcn (18100); // Set uplink EARFCN
}
for (uint32_t i = 0; i < ueDevs.GetN (); ++i)
{
Ptr<LteUeNetDevice> ue = ueDevs.Get (i)->GetObject<LteUeNetDevice> ();
ue->GetPhy ()->SetTxPower (23); // Set transmit power to 23 dBm
}
}
int main (int argc, char *argv[])
{
// Enable logging
LogComponentEnable (“SpectrumPowerAllocationExample”, LOG_LEVEL_INFO);
// Create nodes
NodeContainer ueNodes;
ueNodes.Create (10); // 10 UEs
NodeContainer enbNodes;
enbNodes.Create (1); // 1 eNodeB
// Set up LTE and EPC (Evolved Packet Core)
Ptr<LteHelper> lteHelper = CreateObject<LteHelper> ();
Ptr<PointToPointEpcHelper> epcHelper = CreateObject<PointToPointEpcHelper> ();
lteHelper->SetEpcHelper (epcHelper);
// Create remote host
Ptr<Node> remoteHost = CreateObject<Node> ();
InternetStackHelper internet;
internet.Install (remoteHost);
Ptr<Ipv4StaticRouting> remoteHostStaticRouting = Ipv4RoutingHelper::GetRouting<Ipv4StaticRouting> (remoteHost->GetObject<Ipv4> ()->GetRoutingProtocol ());
// Create PGW node
Ptr<Node> pgw = epcHelper->GetPgwNode ();
// Create an Internet connection between the remote host and the PGW
PointToPointHelper p2ph;
p2ph.SetDeviceAttribute (“DataRate”, DataRateValue (DataRate (“100Gb/s”)));
p2ph.SetChannelAttribute (“Delay”, TimeValue (Seconds (0.010)));
NetDeviceContainer internetDevices = p2ph.Install (pgw, remoteHost);
Ipv4AddressHelper ipv4h;
ipv4h.SetBase (“1.0.0.0”, “255.0.0.0”);
Ipv4InterfaceContainer internetIpIfaces = ipv4h.Assign (internetDevices);
remoteHostStaticRouting->AddNetworkRouteTo (Ipv4Address (“7.0.0.0”), Ipv4Mask (“255.0.0.0”), internetIpIfaces.GetAddress (1), 1);
// Install LTE Devices to the eNodeB nodes
NetDeviceContainer enbDevs = lteHelper->InstallEnbDevice (enbNodes);
// Install LTE Devices to the UE nodes
NetDeviceContainer ueDevs = lteHelper->InstallUeDevice (ueNodes);
// Install the IP stack on the UEs
internet.Install (ueNodes);
Ipv4InterfaceContainer ueIpIface = epcHelper->AssignUeIpv4Address (NetDeviceContainer (ueDevs));
lteHelper->Attach (ueDevs, enbDevs.Get (0));
// Set mobility model
MobilityHelper mobility;
mobility.SetMobilityModel (“ns3::ConstantPositionMobilityModel”);
mobility.Install (enbNodes);
mobility.SetPositionAllocator (“ns3::RandomBoxPositionAllocator”,
“X”, StringValue (“ns3::UniformRandomVariable[Min=0.0|Max=100.0]”),
“Y”, StringValue (“ns3::UniformRandomVariable[Min=0.0|Max=100.0]”),
“Z”, StringValue (“ns3::UniformRandomVariable[Min=0.0|Max=50.0]”));
mobility.SetMobilityModel (“ns3::ConstantPositionMobilityModel”);
mobility.Install (ueNodes);
// Set power and spectrum allocation
SetPowerAndSpectrumAllocation (lteHelper, enbDevs, ueDevs);
// Install and start applications on UEs and remote host
uint16_t dlPort = 1234;
uint16_t ulPort = 2000;
// Downlink (remote host -> UE) application
OnOffHelper dlClientHelper (“ns3::UdpSocketFactory”, InetSocketAddress (ueIpIface.GetAddress (0), dlPort));
dlClientHelper.SetAttribute (“OnTime”, StringValue (“ns3::ConstantRandomVariable[Constant=1]”));
dlClientHelper.SetAttribute (“OffTime”, StringValue (“ns3::ConstantRandomVariable[Constant=0]”));
ApplicationContainer clientApps = dlClientHelper.Install (remoteHost);
clientApps.Start (Seconds (1.0));
clientApps.Stop (Seconds (10.0));
// Uplink (UE -> remote host) application
UdpClientHelper ulClient (internetIpIfaces.GetAddress (1), ulPort);
ulClient.SetAttribute (“Interval”, TimeValue (MilliSeconds (100)));
ulClient.SetAttribute (“MaxPackets”, UintegerValue (1000));
ulClient.SetAttribute (“PacketSize”, UintegerValue (1024));
ApplicationContainer clientApps2 = ulClient.Install (ueNodes.Get (0));
clientApps2.Start (Seconds (2.0));
clientApps2.Stop (Seconds (10.0));
// Set up FlowMonitor
FlowMonitorHelper flowmon;
Ptr<FlowMonitor> monitor = flowmon.InstallAll ();
// Run 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: Define Power and Spectrum Allocation
The SetPowerAndSpectrumAllocation function sets the transmit power and spectrum allocation for the eNodeB and UEs.
void SetPowerAndSpectrumAllocation (Ptr<LteHelper> lteHelper, NetDeviceContainer enbDevs, NetDeviceContainer ueDevs)
{
// Example of setting transmit power and spectrum allocation
for (uint32_t i = 0; i < enbDevs.GetN (); ++i)
{
Ptr<LteEnbNetDevice> enb = enbDevs.Get (i)->GetObject<LteEnbNetDevice> ();
enb->GetPhy ()->SetTxPower (30); // Set transmit power to 30 dBm
// Allocate spectrum (this is a simple example, real allocation would be dynamic)
enb->GetPhy ()->SetDlEarfcn (100); // Set downlink EARFCN
enb->GetPhy ()->SetUlEarfcn (18100); // Set uplink EARFCN
}
for (uint32_t i = 0; i < ueDevs.GetN (); ++i)
{
Ptr<LteUeNetDevice> ue = ueDevs.Get (i)->GetObject<LteUeNetDevice> ();
ue->GetPhy ()->SetTxPower (23); // Set transmit power to 23 dBm
}
}
Step 5: Set Up Mobility Models
In the example, the ConstantPositionMobilityModel is used for both eNodeBs and UEs for simplicity. Adjust the mobility models and parameters as needed for your specific use case.
Step 6: Install and Start Applications
The illustration sets up downlink and uplink traffic among the UEs and a remote host. Regulate the application parameters to act out diverse types of traffic.
Step 7: Run the Simulation
Compile and run your simulation script to see the effect of spectrum and power allocation on network performance. The output contains statistics like the number of packets transmitted and received, throughput, and any packet loss.
In the end, we understand how to implement and simulate the spectrum and power allocation in ns3 tool by utilized the certain conditions. We will support and provide further details about spectrum and power allocation.
Feel free to reach out to us at drop ns3simulation.com for more information on our comparative analysis of Spectrum & Power Allocation in ns3 tool. We specialize in cognitive radio networks (CRNs) and cellular networks.