How to Calculate Network Bandwidth in NS2

To calculate the network bandwidth using NS2 that refers to the maximum rate at which data can transfer via a network connection or link and it normally calculated in bits per second (bps), kilobits per second (kbps), or megabits per second (Mbps). It is significant metric for calculating network performance and it is frequently a key focus in replications including network capacity planning and data transfer. We give basic computation steps to you on how to calculate the network bandwidth within NS2:

Steps to Calculate Network Bandwidth in NS2

  1. Set up NS2 Simulation: Describe a simulation scenario in which data packets are transferred among the nodes across a network link with known bandwidth. Take over the packet transmission and reception data to estimate the effective bandwidth.
  2. Run the Simulation: Implement the replication to collect the data regarding the packet transmission rates and throughput.
  3. Analyze the Trace File: The simulation environment NS2 generates a trace file that logs comprehensive data concerning the packet transmissions. We can be used this trace file to compute the bandwidth according to the amount of data transmitted and the time taken.

Example TCL Script for Data Transmission

Given below is a basic instance for TCL script, which configure a simple network with two nodes, a link with defined bandwidth, and uses UDP agents to send data:

# Create the simulator

set ns [new Simulator]

# Define the topology with two nodes: source and destination

set node_(0) [$ns node]

set node_(1) [$ns node]

# Create a duplex link between the nodes (1 Mbps bandwidth, 10ms delay)

$ns duplex-link $node_(0) $node_(1) 1Mb 10ms DropTail

# Attach UDP agents to nodes for sending and receiving data

set udp0 [new Agent/UDP]

set sink [new Agent/Null]

$ns attach-agent $node_(0) $udp0

$ns attach-agent $node_(1) $sink

$ns connect $udp0 $sink

# Set up Constant Bit Rate (CBR) traffic on the UDP agent

set cbr0 [new Application/Traffic/CBR]

$cbr0 attach-agent $udp0

$cbr0 set packetSize_ 512        ;# Packet size in bytes

$cbr0 set rate_ 1Mb              ;# Transmission rate

# Start and stop the traffic

$ns at 1.0 “$cbr0 start”

$ns at 10.0 “$cbr0 stop”

# Set up tracing

set tracefile [open out.tr w]

$ns trace-all $tracefile

# Run the simulation

$ns run

  1. Calculate Bandwidth from Trace File:

When the simulation completes then we will be required to assess the trace file (out.tr) to evaluate the effective bandwidth.

Using AWK Script for Bandwidth Calculation:

We can be used an AWK script to process the trace file and compute the bandwidth. The following is an instance AWK script for computing the throughput:

BEGIN {

total_data = 0

start_time = -1

end_time = -1

}

/^r/ {

if (start_time == -1) start_time = $2

end_time = $2

total_data += $4

}

END {

duration = end_time – start_time

if (duration > 0) {

throughput = (total_data * 8) / duration # throughput in bps

print “Throughput: ” throughput ” bps”

} else {

print “No data transmitted”

}

}

  • Explanation of AWK Script:
    • total_data gathers the total amount of data received.
    • start_time and end_time track the simulation time for the initial and terminus received packets.
    • The END block estimates throughput rely on total data and time duration.

Summary

  1. Set Up Simulation: Describe the nodes, links, and traffic within NS2.
  2. Run Simulation: Implement the script to generate a trace file.
  3. Analyze Trace File: We can use an AWK script or other tools to assess the bandwidth rely on data transmission and timing.

In this setup, we had learn and acquire more knowledge regarding the Network Bandwidth that were computed and analysed using the TCL and AWK script within NS2 simulation environment. We plan to distribute further details about this Network Bandwidth based on your needs.

Let us know all the details about your parameters, and we promise to give you the best comparison project results. Calculating network bandwidth in NS2 can be tricky, so keep in touch with us, and we’ll help you get the best outcomes.