To implement the uplink synchronization in ns3 needs to include the setup simulation scenario to design the uplink broadcast in LTE network exactly. Uplink synchronization is the vital for safeguard the user equipment (UE) that transfers data to the eNodeB without interference. The given below is the detailed procedure on how to implement the uplink synchronization 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
Generate the 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. The below are the sample setup for an LTE network with uplink synchronization.
#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 (“UplinkSynchronizationExample”);
int main (int argc, char *argv[])
{
// Enable logging
LogComponentEnable (“UplinkSynchronizationExample”, 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);
// 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);
// Configure uplink synchronization parameters
lteHelper->SetAttribute (“UlBandwidth”, UintegerValue (50)); // Set uplink bandwidth
lteHelper->SetAttribute (“EnbUlScheduler”, StringValue (“ns3::PfFfMacScheduler”)); // Set uplink scheduler
// Install and start applications on UEs and remote host
uint16_t ulPort = 20000;
ApplicationContainer clientApps;
ApplicationContainer serverApps;
UdpClientHelper ulClient (ueIpIface.GetAddress (0), ulPort);
ulClient.SetAttribute (“Interval”, TimeValue (MilliSeconds (10)));
ulClient.SetAttribute (“MaxPackets”, UintegerValue (1000000));
clientApps.Add (ulClient.Install (ueNodes.Get (0)));
PacketSinkHelper ulPacketSinkHelper (“ns3::UdpSocketFactory”, InetSocketAddress (Ipv4Address::GetAny (), ulPort));
serverApps.Add (ulPacketSinkHelper.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 Uplink Synchronization Parameters
In the example, we set the uplink bandwidth and scheduler:
lteHelper->SetAttribute (“UlBandwidth”, UintegerValue (50)); // Set uplink bandwidth
lteHelper->SetSchedulerType (“ns3::PfFfMacScheduler”); // Set uplink scheduler
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, and 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 uplink 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 analyse performance metrics like 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 uplink synchronization on network performance. The output will conclude statistics such as the number of packets transmitted and received throughput, and any packet loss.
As we discussed earlier about how the uplink synchronization will perform in ns3 tool and we help to deliver additional material about how the uplink synchronization will adapt in diverse surroundings.
We have developed Uplink Synchronization in ns3, achieving optimal implementation results by designing the uplink broadcast within the LTE network, allowing you to continue your work effectively.