To Implement telecommunication networks in ns-3 by simulating various aspects of telecommunication systems, such as cellular networks (LTE, 5G), Wi-Fi networks, or mixed (heterogeneous) networks. Below given step by step guide to implement telecommunication using LTE in ns-3, which also includes setting up eNodeBs (base stations), UEs (user equipment), and configuring mobility, network devices, and applications.
Step-by-Step Guide to Implement Telecommunication in ns-3
- Install ns-3:
- Ensure ns-3 is installed. Follow the installation instructions for ns-3 if you haven’t done so already.
- Create a Simulation Script:
- Create a new script file, e.g., telecom-simulation.cc.
- Include Necessary Headers:
#include “ns3/core-module.h”
#include “ns3/network-module.h”
#include “ns3/internet-module.h”
#include “ns3/point-to-point-module.h”
#include “ns3/mobility-module.h”
#include “ns3/lte-module.h”
#include “ns3/applications-module.h”
Define the Main Function:
using namespace ns3;
int main (int argc, char *argv[])
{
CommandLine cmd;
cmd.Parse (argc, argv);
Set Up the Network Topology:
- Create nodes for the LTE eNodeBs (base stations) and UEs (user equipment):
NodeContainer ueNodes;
ueNodes.Create (2); // Create 2 UEs
NodeContainer enbNodes;
enbNodes.Create (1); // Create 1 LTE eNodeB
Install the LTE Network Devices:
- Install the LTE network devices on the eNodeB and UEs
Ptr<LteHelper> lteHelper = CreateObject<LteHelper> ();
Ptr<PointToPointEpcHelper> epcHelper = CreateObject<PointToPointEpcHelper> ();
lteHelper->SetEpcHelper (epcHelper);
Ptr<Node> pgw = epcHelper->GetPgwNode ();
// Install LTE Devices to the eNodeB and UEs
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 the UEs
Ipv4InterfaceContainer ueIpIface;
ueIpIface = epcHelper->AssignUeIpv4Address (NetDeviceContainer (ueLteDevs));
// Attach the UEs to the eNodeB
lteHelper->Attach (ueLteDevs, enbLteDevs.Get (0));
Install Mobility Models:
- Set up the mobility model for the eNodeB and UEs
MobilityHelper mobility;
mobility.SetMobilityModel (“ns3::ConstantPositionMobilityModel”);
mobility.Install (enbNodes);
mobility.SetMobilityModel (“ns3::ConstantVelocityMobilityModel”);
mobility.Install (ueNodes);
// Set initial positions and velocities for UEs
Ptr<ConstantVelocityMobilityModel> ueMobility1 = ueNodes.Get(0)->GetObject<ConstantVelocityMobilityModel>();
ueMobility1->SetPosition (Vector (0, 0, 0));
ueMobility1->SetVelocity (Vector (20, 0, 0)); // Moving at 20 m/s
Ptr<ConstantVelocityMobilityModel> ueMobility2 = ueNodes.Get(1)->GetObject<ConstantVelocityMobilityModel>();
ueMobility2->SetPosition (Vector (50, 0, 0));
ueMobility2->SetVelocity (Vector (-10, 0, 0)); // Moving at -10 m/s
Install Applications:
- Create and install a UDP echo server application on one of the UEs
UdpEchoServerHelper echoServer (9);
ApplicationContainer serverApps = echoServer.Install (ueNodes.Get (0));
serverApps.Start (Seconds (1.0));
serverApps.Stop (Seconds (10.0));
// Create and install a UDP echo client application on the other UE:
UdpEchoClientHelper echoClient (ueIpIface.GetAddress (0), 9);
echoClient.SetAttribute (“MaxPackets”, UintegerValue (1));
echoClient.SetAttribute (“Interval”, TimeValue (Seconds (1.0)));
echoClient.SetAttribute (“PacketSize”, UintegerValue (1024));
ApplicationContainer clientApps = echoClient.Install (ueNodes.Get (1));
clientApps.Start (Seconds (2.0));
clientApps.Stop (Seconds (10.0));
Run the Simulation:
- Define the simulation stop time and start the simulator
Simulator::Stop (Seconds (10.0));
Simulator::Run ();
Simulator::Destroy ();
return 0;
Example Complete Script (telecom-simulation.cc):
Some example script for simulating telecommunication was given below:
#include “ns3/core-module.h”
#include “ns3/network-module.h”
#include “ns3/internet-module.h”
#include “ns3/point-to-point-module.h”
#include “ns3/mobility-module.h”
#include “ns3/lte-module.h”
#include “ns3/applications-module.h”
using namespace ns3;
int main (int argc, char *argv[])
{
CommandLine cmd;
cmd.Parse (argc, argv);
NodeContainer ueNodes;
ueNodes.Create (2); // Create 2 UEs
NodeContainer enbNodes;
enbNodes.Create (1); // Create 1 LTE eNodeB
Ptr<LteHelper> lteHelper = CreateObject<LteHelper> ();
Ptr<PointToPointEpcHelper> epcHelper = CreateObject<PointToPointEpcHelper> ();
lteHelper->SetEpcHelper (epcHelper);
Ptr<Node> pgw = epcHelper->GetPgwNode ();
// Install LTE Devices to the eNodeB and UEs
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 the UEs
Ipv4InterfaceContainer ueIpIface;
ueIpIface = epcHelper->AssignUeIpv4Address (NetDeviceContainer (ueLteDevs));
// Attach the UEs to the eNodeB
lteHelper->Attach (ueLteDevs, enbLteDevs.Get (0));
// Set up the mobility model
MobilityHelper mobility;
mobility.SetMobilityModel (“ns3::ConstantPositionMobilityModel”);
mobility.Install (enbNodes);
mobility.SetMobilityModel (“ns3::ConstantVelocityMobilityModel”);
mobility.Install (ueNodes);
// Set initial positions and velocities for UEs
Ptr<ConstantVelocityMobilityModel> ueMobility1 = ueNodes.Get(0)->GetObject<ConstantVelocityMobilityModel>();
ueMobility1->SetPosition (Vector (0, 0, 0));
ueMobility1->SetVelocity (Vector (20, 0, 0)); // Moving at 20 m/s
Ptr<ConstantVelocityMobilityModel> ueMobility2 = ueNodes.Get(1)->GetObject<ConstantVelocityMobilityModel>();
ueMobility2->SetPosition (Vector (50, 0, 0));
ueMobility2->SetVelocity (Vector (-10, 0, 0)); // Moving at -10 m/s
// Install Applications
UdpEchoServerHelper echoServer (9);
ApplicationContainer serverApps = echoServer.Install (ueNodes.Get (0));
serverApps.Start (Seconds (1.0));
serverApps.Stop (Seconds (10.0));
UdpEchoClientHelper echoClient (ueIpIface.GetAddress (0), 9);
echoClient.SetAttribute (“MaxPackets”, UintegerValue (1));
echoClient.SetAttribute (“Interval”, TimeValue (Seconds (1.0)));
echoClient.SetAttribute (“PacketSize”, UintegerValue (1024));
ApplicationContainer clientApps = echoClient.Install (ueNodes.Get (1));
clientApps.Start (Seconds (2.0));
clientApps.Stop (Seconds (10.0));
Simulator::Stop (Seconds (10.0));
Simulator::Run ();
Simulator::Destroy ();
return 0;
}
Explanation:
- Network Configuration:
- Nodes are created for the UEs and eNodeB.
- The LTE network devices are installed on these nodes, and IP addresses are assigned.
- Mobility:
- The mobility model is set for the eNodeB and UEs. The UEs are given initial positions and velocities to simulate movement.
- Applications:
- A UDP echo server application is installed on one of the UEs.
- A UDP echo client application is installed on the other UE to simulate communication.
- Running the Simulation:
- The simulation is run for a specified duration, and then the simulator is destroyed to clean up.
Finally, Telecommunication system using LTE in ns-3 was implemented by simulating various aspects like cellular networks, WiFi networks, or mixed (heterogeneous) networks.