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How to Calculate Network Served number of users in Ns3

To calculate the network served number of users in ns3, we need to follow several steps. Because we had to track the number of UEs which are ended with successful communication with the eNodeBs (base stations) and received the expected data packets. This will help us to determine how many user equipment (UE) nodes have successfully received service (e.g., connected to a base station and exchanged data) during the simulation.

To determine the number of network users served for your project, we conduct thorough simulations in NS3 scenarios.

Here the steps given below guide on how to calculate the Network Served Number of Users in ns3.

Step-by-Step Guide to Calculate Network Served Number of Users in ns3

  1. Set Up the Simulation Environment:
    • Make sure ns3 is installed and set up correctly.
    • Include necessary modules for the simulation (e.g., LTE, WiFi, Internet, Mobility).
  2. Create Network Topology:
    • Define nodes for the base stations (eNodeBs) and user equipment (UEs).
    • Set up the wireless network with appropriate configurations.
  3. Configure Applications:
    • Install traffic-generating applications (e.g., UDP, TCP) on the UEs.
  4. Enable Tracing and Metrics Collection:
    • Enable tracing to capture relevant metrics such as connection establishment and data packet reception.
  5. Run the Simulation:
    • Execute the simulation and collect the trace data.
  6. Analyze the Results:
    • Post-process the trace data to calculate the number of served users.

Example Code Snippet for LTE Network

Here’s an example of how to set up an LTE network, generate traffic, and capture the number of served users in ns3:

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/point-to-point-module.h”

#include “ns3/applications-module.h”

#include “ns3/lte-module.h”

#include “ns3/epc-helper.h”

#include “ns3/mobility-module.h”

#include “ns3/flow-monitor-module.h”

#include “ns3/config-store.h”

#include “ns3/log.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“LteServedUsersExample”);

std::set<uint64_t> servedUsers; // Set to store IMSI of served users

void PacketReceivedCallback (Ptr<const Packet> packet, const Address &address)

{

// Extract IMSI from packet metadata (assuming the IMSI is added to packet metadata)

uint64_t imsi = packet->GetUid(); // Replace with actual method to get IMSI

servedUsers.insert(imsi);

}

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

{

// Set up logging

LogComponentEnable (“UdpClient”, LOG_LEVEL_INFO);

LogComponentEnable (“UdpServer”, LOG_LEVEL_INFO);

// Create LTE network nodes

NodeContainer ueNodes;

NodeContainer enbNodes;

ueNodes.Create (10);

enbNodes.Create (3);

// Install Mobility model

MobilityHelper mobility;

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

mobility.Install (enbNodes);

mobility.SetPositionAllocator (“ns3::GridPositionAllocator”,

“MinX”, DoubleValue (0.0),

“MinY”, DoubleValue (0.0),

“DeltaX”, DoubleValue (50.0),

“DeltaY”, DoubleValue (50.0),

“GridWidth”, UintegerValue (3),

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

mobility.Install (ueNodes);

// Create LTE helper and EPC helper

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 Internet stack on UEs

InternetStackHelper internet;

internet.Install (ueNodes);

// Assign IP addresses to UEs

Ipv4InterfaceContainer ueIpIface;

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

// Attach UEs to eNodeBs

for (uint32_t i = 0; i < ueNodes.GetN (); ++i)

{

lteHelper->Attach (ueLteDevs.Get (i), enbLteDevs.Get (i % enbNodes.GetN ()));

}

// Install and start applications on UEs and remote host

uint16_t dlPort = 1234;

ApplicationContainer clientApps;

ApplicationContainer serverApps;

for (uint32_t i = 0; i < ueNodes.GetN (); ++i)

{

UdpServerHelper myServer (dlPort);

serverApps.Add (myServer.Install (ueNodes.Get (i)));

UdpClientHelper myClient (ueIpIface.GetAddress (i), dlPort);

myClient.SetAttribute (“MaxPackets”, UintegerValue (1000));

myClient.SetAttribute (“Interval”, TimeValue (MilliSeconds (100)));

myClient.SetAttribute (“PacketSize”, UintegerValue (1024));

clientApps.Add (myClient.Install (ueNodes.Get (i)));

}

serverApps.Start (Seconds (1.0));

serverApps.Stop (Seconds (10.0));

clientApps.Start (Seconds (2.0));

clientApps.Stop (Seconds (10.0));

// Connect callback to packet reception

for (uint32_t i = 0; i < ueNodes.GetN (); ++i)

{

Ptr<NetDevice> netDev = ueLteDevs.Get (i);

Ptr<LteUeNetDevice> ueLteDev = DynamicCast<LteUeNetDevice> (netDev);

ueLteDev->GetPhy ()->TraceConnectWithoutContext (“PhyRxEnd”, MakeCallback (&PacketReceivedCallback));

}

// Run the simulation

Simulator::Stop (Seconds (11.0));

Simulator::Run ();

// Output the number of served users

NS_LOG_UNCOND (“Number of served users: ” << servedUsers.size ());

// Clean up

Simulator::Destroy ();

return 0;

}

Explanation:

  1. Setup Logging:
    • Enable logging for the UDP applications to track their activities.
  2. Create Nodes and Network:
    • Create nodes representing UEs and eNodeBs.
    • Configure mobility models for UEs and eNodeBs.
  3. Install LTE and EPC Helper:
    • Create and configure LTE and EPC helpers.
    • Install LTE devices on the UEs and eNodeBs.
  4. Install Internet Stack:
    • Install the Internet stack on UEs.
    • Assign IP addresses to the UEs.
  5. Attach UEs to eNodeBs:
    • Attach each UE to an eNodeB. Here, a round-robin attachment is used for simplicity.
  6. Install Applications:
    • Install UDP server applications on the UEs.
    • Install UDP client applications on the UEs, sending traffic to the server.
  7. Connect to Packet Reception Trace:
    • Connect to the PhyRxEnd trace source to log the reception of packets.
    • Use the PacketReceivedCallback function to track which UEs have successfully received packets.
  8. Run Simulation:
    • Run the simulation for the specified duration.
  9. Count Served Users:
    • The PacketReceivedCallback function logs the IMSI of each UE that successfully receives packets.
    • After the simulation, the size of the servedUsers set indicates the number of unique UEs that were served.

Analyzing the Results:

  • Served Number of Users:
    • By counting the unique IMSIs of UEs that successfully received packets we can determine the number of served users.
    • This metric provides an indication of the network’s ability to serve multiple users simultaneously.

Finally, we all get to know how to calculate the network served number of users in ns3 by determining how many user equipment (UE) nods have successfully received service during the simulation.We measure networking performance analysis get in touch with us  ns3simulation.com.