How to Calculate Network Link strength in ns3

To calculate network link strength in ns3, we should measure the received signal strength indicator (RSSI) or similar metrics like signal-to-noise ratio (SNR) or signal-to-interference-plus-noise ratio (SINR).

These metrics provides an indication of the quality or strength of the link between nodes in the network. Calculating of network link strength in ns3simulation for your project will be done by our researchers be in touch with us if you face any difficulties

Steps for calculating network link strength

1. Set up the simulation:

• Make sure that ns3 is installed in the computer. If not, install it and include necessary modules.

2. Create Network Topology:

• For the base stations (eNodeBs) and user equipment (UEs), define the nodes. Set up the wireless network with appropriate configurations.

3. Install applications :

• On the nodes, setup applications to generate and receive traffic.

4. Enable tracing and Metrics Collection:

• To capture relevant metrics such as RSSI, SNR, or SINR, use ns3 tracing capabilities.

5. Run the simulation :

• Execute the simulation and collect the trace data.

6. Analyze the results :

• Post-process the trace data to calculate the link strength metrics.

Example of a simple LTE Network

Create a basic set up of LTE network, generate traffic, and capture RSSI values to calculate link strength 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/config-store.h”

#include “ns3/log.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“LteLinkStrengthExample”);

// Function to log RSSI

void LogRssi (std::string context, uint64_t imsi, uint16_t cellId, uint16_t rnti, double rssi)

{

std::cout << Simulator::Now ().GetSeconds () << “s: ” << context

<< ” IMSI ” << imsi

<< ” CellId ” << cellId

<< ” RNTI ” << rnti

<< ” RSSI ” << rssi << ” dBm” << std::endl;

}

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 to trace sources

Config::Connect (“/NodeList/*/DeviceList/*/LteUePhy/ReportCurrentCellRsrpSinr”, MakeCallback (&LogRssi));

// Run the simulation

Simulator::Stop (Seconds (11.0));

Simulator::Run ();

// Clean up

Simulator::Destroy ();

return 0;

}

Explanation:

1. Setup Logging:
   • To track activities, enable logging for the UDP applications.
2. Create Nodes and Network:
   • To represent UEs and eNodeBs, create nodes.
   • For UEs and eNodeBs, configure mobility models.
3. Install LTE and EPC Helper:
   • Configure and create LTE and EPC helpers.
   • On the UEs and eNodeBs, install LTE devices.
4. Install Internet Stack:
   • On UEs, install the Internet stack.
   • 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:
   • On UEs, install UDP server applications.
   • Install UDP client applications on the UEs, sending traffic to the server.
7. Connect to Trace Sources:
   • For logging RSSI values, connect to the trace source for logging RSSI values.
8. Run Simulation:
   • Run the simulation for the specified duration.
9. Log RSSI Values:
   • During the simulation, The LogRssi function logs the RSSI values periodically.
   • RSSI values provide an indication of the signal strength received by the UEs.

Analyzing the Results:

• Link Strength (RSSI):

Along with the simulation time, The RSSI values for each UE are logged, IMSI, cell ID, and RNTI. These metrics provide an indication of the signal strength and quality of the links in the network.

On the whole we had our simulation results for calculating network link strength in ns3 by measuring the received signal strength indicator (RSSI) or similar metrics such as signal-to-noise ratio (SNR) or signal-to-interference-plus-noise ratio (SINR). Also, we provide more topics related to Network link strength.