How to Calculate Network Satisfaction Rate in NS2

To calculate Network Satisfaction Rate in NS2, we have estimated how well the network satisfies the particular Quality of Service (QoS) metrics or user-defined performance criteria. It involves performance metrics like throughput, delay, jitter, packet delivery ratio, or packet drop percentage. The satisfaction rate usually defined to the percentage of users or nodes which attain a predefined level of network performance, thus being “satisfied” with the network’s operation.

The Satisfaction Rate could be based on numerous conditions like:

  • Throughput: The rate at which data is successfully carried to the destination.
  • Packet Delivery Ratio (PDR): The ratio of packets effectively distributed to the destination to the total number of packets sent.
  • End-to-End Delay: The time it takes for a packet to move from source to destination.
  • Packet Drop Rate: The percentage of packets that is lost in course of transmission.

Formula for Network Satisfaction Rate:

The Network Satisfaction Rate can be expressed as:

Satisfaction Rate=Number of Satisfied Nodes (or Flows) Total Number of Nodes (or Flows)×100\text{Satisfaction Rate} = \frac{\text{Number of Satisfied Nodes (or Flows)}}{\text{Total Number of Nodes (or Flows)}} \times 100Satisfaction Rate=Total Number of Nodes (or Flows)Number of Satisfied Nodes (or Flows)​×100

Where:

  • Satisfied Nodes: Nodes or flows that come across the predefined performance criteria like meeting minimum throughput, delay, etc.
  • Total Nodes: The total number of nodes or flows in the simulation.

Steps to Calculate Network Satisfaction Rate in NS2:

  1. Define Performance Criteria: Decide on the parameters and threshold values that will regulate either on a node or flow is satisfied such as minimum throughput of 1 Mbps, maximum delay of 100 ms.
  2. Set Up the Network Simulation: Replicate a network with multiple nodes and traffic flows using agents like TCP, UDP, or CBR.
  3. Measure Key Metrics: Evaluate key parameters like throughput, delay, packet delivery ratio (PDR), or packet drop percentage using the NS2 trace file.
  4. Check Satisfaction for Each Node or Flow: Compare the measured parameters against the predefined thresholds for each node or flow. If the node or flow satisfies the conditions, it is considered “satisfied.”
  5. Calculate Satisfaction Rate: Compute the percentage of satisfied nodes or flows relative to the total number of nodes or flows in the network.

Example Tcl Script to Simulate Network Satisfaction in NS2:

Here’s a modest NS2 Tcl script that mimics a network with multiple nodes and flows, in which we can later compute the satisfaction rate according to the throughput and packet delivery ratio (PDR).

# Create a new simulator instance

set ns [new Simulator]

# Define nodes

set node0 [$ns node]

set node1 [$ns node]

set node2 [$ns node]

set node3 [$ns node]

# Create links between the nodes

$ns duplex-link $node0 $node1 1Mb 10ms DropTail

$ns duplex-link $node1 $node2 1Mb 10ms DropTail

$ns duplex-link $node2 $node3 1Mb 10ms DropTail

# Attach UDP agents and CBR traffic

set udp0 [new Agent/UDP]

set null0 [new Agent/Null]

$ns attach-agent $node0 $udp0

$ns attach-agent $node3 $null0

$ns connect $udp0 $null0

# Create a CBR traffic source to generate packets

set cbr0 [new Application/Traffic/CBR]

$cbr0 attach-agent $udp0

$cbr0 set packetSize_ 512

$cbr0 set rate_ 500Kb

# Start and stop traffic

$ns at 1.0 “$cbr0 start”

$ns at 5.0 “$cbr0 stop”

# Open trace file to log events

set tracefile [open trace.tr w]

$ns trace-all $tracefile

# Define finish procedure to close the trace file and stop the simulation

proc finish {} {

global ns tracefile

$ns flush-trace

close $tracefile

exit 0

}

# End the simulation at 6.0 seconds

$ns at 6.0 “finish”

$ns run

  1. Trace File Analysis:

The trace file logs numerous events that have when packets are sent (s), received (r), and dropped (d). To estimate the satisfaction rate, we will require extracting the required parameters like throughput, PDR, or delay.

Example Trace File Output:

s 1.0 _0_ AGT — 512 [0 0 0 0] ——- [0:0 1:0 32 0]

r 1.2 _3_ AGT — 512 [0 0 0 0] ——- [0:0 1:0 32 0]

d 2.0 _2_ RTR — 512 [0 0 0 0] ——- [0:0 1:0 32 0]

In this example:

  • s signifies packets being sent.
  • r symbolizes packets being received.
  • d denotes packets being dropped.
  1. Calculate Key Metrics:

To compute parameters like throughput, packet delivery ratio (PDR), and latency, we can measure the trace file using a bash script or another tool.

Bash Script to Calculate Throughput:

# Calculate the total number of packets received

received_packets=$(grep “^r” trace.tr | grep “_3_” | wc -l)

# Total time of simulation (e.g., from 1.0 to 5.0 seconds)

total_time=4.0

# Packet size in bytes (512 bytes per packet)

packet_size=512

# Calculate throughput (in Kbps)

throughput=$(echo “scale=2; $received_packets * $packet_size * 8 / $total_time / 1000” | bc)

echo “Throughput: $throughput Kbps”

Bash Script to Calculate Packet Delivery Ratio (PDR):

# Count the number of packets sent by the source

sent_packets=$(grep “^s” trace.tr | grep “_0_” | wc -l)

# Count the number of packets received by the destination

received_packets=$(grep “^r” trace.tr | grep “_3_” | wc -l)

# Calculate PDR

if [ $sent_packets -gt 0 ]; then

pdr=$(echo “scale=2; $received_packets / $sent_packets * 100” | bc)

echo “Packet Delivery Ratio (PDR): $pdr%”

else

echo “No packets were sent.”

fi

  1. Check Satisfaction:

According to the calculated parameters, compare the outcomes against predefined thresholds to control if each node or flow is satisfied. For example:

  • A node is satisfied if the throughput is greater than 300 Kbps and the PDR is greater than 90%.

Bash Script to Check Satisfaction:

# Define the satisfaction criteria

min_throughput=300  # in Kbps

min_pdr=90          # in percentage

# Check if throughput meets the minimum threshold

if (( $(echo “$throughput >= $min_throughput” | bc -l) )) && (( $(echo “$pdr >= $min_pdr” | bc -l) )); then

echo “Node or flow is satisfied”

else

echo “Node or flow is not satisfied”

fi

  1. Calculate Satisfaction Rate:

After validate the satisfaction for each node or flow, estimate the satisfaction rate by way of the percentage of nodes or flows that satisfy the condition.

Bash Script to Calculate Satisfaction Rate:

# Assume total_nodes is the number of nodes/flows and satisfied_nodes is the number of satisfied ones

total_nodes=4

satisfied_nodes=3  # Example: 3 nodes are satisfied out of 4

# Calculate satisfaction rate

satisfaction_rate=$(echo “scale=2; $satisfied_nodes / $total_nodes * 100” | bc)

echo “Satisfaction Rate: $satisfaction_rate%”

Summary of Steps:

  1. Define Performance Criteria: Set thresholds for throughput, PDR, latency, or other parameters to describe “satisfaction.”
  2. Simulate Network Traffic: Use NS2 to mimic a network and create traffic.
  3. Analyze Trace File: Compute key metrics like throughput, packet delivery ratio (PDR), and latency using the trace file.
  4. Check Satisfaction: For each node or flow, validate either the parameters satisfy the predefined conditions.
  5. Calculate Satisfaction Rate: The satisfaction rate is the percentage of nodes or flows that satisfy the condition.

In the conclusion, we completely learn and implicit about how to calculate the Network Satisfaction Rate using ns2 tool and to satisfied the specific quality of service in the network. More information regarding the Network Satisfaction Rate will also be provided. Stay in touch with us; we will provide you with the greatest outcomes and on-time delivery. To calculate Network Satisfaction Rate in NS2 tool, it is recommended to acquire expert solutions. Please provide us all of your parameter information, and we will be happy to walk you through the networking comparison analysis process.