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How to Implement network H & off Management in ns3

To implement the handover (H) and offloading (off) management in ns3 has needs to setup the scenarios and to manage the connection in LTE eNodeBs of the devices can move among the numerous base stations respectively. In the specific, the mobile network is relevant to maintain an uninterrupted connection while moving is vital.

The team at ns3simulation.com will handle the implementation of Network H & off Management in ns3programming. Trust us to execute the project efficiently and deliver top-notch results.

The below are the procedures on how to implement the handover and offloading management in ns3:

Step-by-Step Implementation:

Step 1: Install ns3

Make certain 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, mobility models, and communication protocols.

Step 3: Define Network Topology

Create nodes and define the network topology, focusing on the setup of eNodeBs and UEs for LTE networks.

#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 (“HandoverExample”);

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

{

// Enable logging

LogComponentEnable (“HandoverExample”, LOG_LEVEL_INFO);

// Create nodes

NodeContainer ueNodes;

ueNodes.Create (1); // One UE

NodeContainer enbNodes;

enbNodes.Create (2); // Two eNodeBs

// 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 enbLteDevs = lteHelper->InstallEnbDevice (enbNodes);

// Install LTE Devices to the UE node

NetDeviceContainer ueLteDevs = lteHelper->InstallUeDevice (ueNodes);

// Install the IP stack on the UEs

internet.Install (ueNodes);

Ipv4InterfaceContainer ueIpIface = epcHelper->AssignUeIpv4Address (NetDeviceContainer (ueLteDevs));

lteHelper->Attach (ueLteDevs.Get (0), enbLteDevs.Get (0));

// Set mobility model

MobilityHelper mobility;

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

mobility.Install (enbNodes);

mobility.SetPositionAllocator (“ns3::GridPositionAllocator”,

“MinX”, DoubleValue (10.0),

“MinY”, DoubleValue (10.0),

“DeltaX”, DoubleValue (50.0),

“DeltaY”, DoubleValue (50.0),

“GridWidth”, UintegerValue (2),

“LayoutType”, StringValue (“RowFirst”));

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

mobility.Install (ueNodes);

ueNodes.Get (0)->GetObject<ConstantVelocityMobilityModel> ()->SetVelocity (Vector (20.0, 0.0, 0.0));

// 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));

// Add X2 interface

lteHelper->AddX2Interface (enbNodes);

// Enable handover

lteHelper->HandoverRequest (Seconds (5.0), ueLteDevs.Get (0), enbLteDevs.Get (0), enbLteDevs.Get (1));

// 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: Set Up Mobility Models

In the example, the ConstantPositionMobilityModel is used for eNodeBs to keep them stationary, and the ConstantVelocityMobilityModel is used for the UE to simulate movement across the network, triggering handovers.

Step 5: Enable Handover

Handover is enabled by calling HandoverRequest method at a specific time in the simulation. In this case, the handover is triggered at 5 seconds:

lteHelper->HandoverRequest (Seconds (5.0), ueLteDevs.Get (0), enbLteDevs.Get (0), enbLteDevs.Get (1));

Step 6: Set Up Traffic Generation

The example sets up downlink and uplink traffic between the UE and a remote host.

Step 7: Run the Simulation

Compile and run your simulation script to see the effect of handover on network performance. The output will include statistics such as the number of packets transmitted and received, throughput, and any packet loss.

In the conclusion, we clearly understood the handover (H) and offloading (off) management manage the connection in LTE eNodeBs that analyses and execute the performance among the numerous base stations using the ns3 framework and we support any further additional details regarding the handover and offloading management also be provided.