How to Implement Network Data Suppression in NS2

To implement Network Data Suppression in NS2 has a series of steps to follow and it is a technique used to decrease redundant or unnecessary data transmissions in networks, usually in the scenarios such as Wireless Sensor Networks (WSNs) or Mobile Ad-hoc Networks (MANETs). Data suppression supports to conserve bandwidth, minimize energy consumption, and enhance overall network efficiency by eliminating redundant transmissions.

For customized Network Data Suppression solutions in the context of NS2 implementation guidance and project ideation, we invite you to engage with us at ns2project.com. We encourage ongoing communication with our team to ensure optimal guidance for implementation and to achieve superior outcomes.

In NS2, data suppression can be implemented by:

  1. Identifying redundant data at intermediate nodes such as similar sensor readings from nearby nodes.
  2. Combining or discarding unnecessary data.
  3. Suppressing transmission of unchanged or unnecessary data to save resources.

Steps to Implement Data Suppression in NS2

To execute data suppression in NS2, we can:

  1. Describe a data aggregation or suppression strategy to decide when to suppress redundant data.
  2. Execute a mechanism at intermediate nodes to classify and manage redundant data.
  3. Adjust the application layer to decide whether data should be forwarded or suppressed.
  1. Set up NS2 Environment

Make sure NS2 is installed and configured properly. We will generate a replication in which nodes detect redundant data and suppress redundant transmissions.

  1. Create a TCL Script for Data Suppression

Below is a sample TCL script that will show on how to implement data suppression in NS2. We assume that nodes intermittently create data, however redundant or identical data is suppressed at intermediate nodes.

Example TCL Script for Network Data Suppression:

# Create a new NS2 simulator

set ns [new Simulator]

# Open trace and NAM output files

set tracefile [open data_suppression.tr w]

$ns trace-all $tracefile

set namfile [open data_suppression.nam w]

$ns namtrace-all $namfile

# Define wireless network parameters

set val(chan)   Channel/WirelessChannel

set val(prop)   Propagation/TwoRayGround

set val(ant)    Antenna/OmniAntenna

set val(netif)  Phy/WirelessPhy

set val(mac)    Mac/802_11

set val(ifq)    Queue/DropTail/PriQueue

set val(ifqlen) 50

set val(ll)     LL

set val(rp)     AODV;# Use AODV routing protocol

set simulation_time 100.0;# Duration of the simulation

# Create topography for the network

set topo [new Topography]

$topo load_flatgrid 1000 1000

# Configure node parameters

$ns node-config -adhocRouting $val(rp) \

-llType $val(ll) \

-macType $val(mac) \

-ifqType $val(ifq) \

-ifqLen $val(ifqlen) \

-antType $val(ant) \

-propType $val(prop) \

-phyType $val(netif) \

-channelType $val(chan) \

-topoInstance $topo \

-agentTrace ON \

-routerTrace ON \

-macTrace ON

# Create nodes dynamically

set num_nodes 5

for {set i 0} {$i < $num_nodes} {incr i} {

set node($i) [$ns node]

set x_pos [expr rand() * 1000]

set y_pos [expr rand() * 1000]

$node($i) set X_ $x_pos

$node($i) set Y_ $y_pos

$node($i) set Z_ 0

}

# Data suppression mechanism: Suppress redundant data if it matches previously received data

set last_received_data [list]

proc suppress_data {src_node dst_node data} {

global last_received_data

if {[lsearch -exact $last_received_data $data] == -1} {

# New data, forward it and store the data

puts “Node $dst_node received new data from Node $src_node: $data”

lappend last_received_data $data

return 1   ;# Data should be forwarded

} else {

# Redundant data, suppress it

puts “Node $dst_node suppressed redundant data from Node $src_node: $data”

return 0   ;# Data should be suppressed

}

}

# Create UDP agent for data transmission

set udp0 [new Agent/UDP]

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

# Create Null agent to receive packets at node1

set null1 [new Agent/Null]

$ns attach-agent $node(1) $null1

# Connect the UDP agent to the Null agent

$ns connect $udp0 $null1

# Create CBR traffic over the UDP agent

set cbr0 [new Application/Traffic/CBR]

$cbr0 set packetSize_ 512

$cbr0 set rate_ 1Mb

$cbr0 attach-agent $udp0

# Schedule the first data transmission from node0 to node1

proc send_data {src_node dst_node data} {

global ns udp0

if {[suppress_data $src_node $dst_node $data] == 1} {

$ns at 1.0 “$udp0 send $data”

} else {

puts “Data suppressed at Node $src_node”

}

}

# Transmit data with and without suppression

$ns at 1.0 “send_data 0 1 {SensorReading 25C}”

$ns at 2.0 “send_data 0 1 {SensorReading 25C}” ;# Redundant data, should be suppressed

$ns at 3.0 “send_data 0 1 {SensorReading 26C}” ;# New data, should be forwarded

$ns at 4.0 “send_data 0 1 {SensorReading 25C}” ;# Data has changed back, should be forwarded

# Schedule simulation end

$ns at $simulation_time “finish”

# Finish procedure to close trace and NAM files

proc finish {} {

global ns tracefile namfile

$ns flush-trace

close $tracefile

close $namfile

exec nam data_suppression.nam &

exit 0

}

# Run the simulation

$ns run

  1. Explanation of Key Components
  • Data Suppression Mechanism: The function suppress_data validate whether the received data has already been seen. If the data is new, it is forwarded, and if it is redundant, it is inhibited. The previously received data is stored in the last_received_data list.
  • Traffic Generation: UDP traffic is created from node0 to node1 using CBR (Constant Bit Rate) traffic. The send_data protocols send data since validate whether the data should be forwarded or suppressed based on the suppression logic.
  • Redundant Data Suppression: Data is routed at intervals of 1 second, and the second transmission (at 2 seconds) is redundant and will be inhibited.
  1. Run the Simulation

Save the script as data_suppression.tcl and execept it in NS2:

ns data_suppression.tcl

Once the simulation completes, we can envision the network using NAM:

nam data_suppression.nam

  1. Explanation of Data Suppression
  • Data Forwarding: When the data is new such as different sensor readings, the node forwards it to the next hop in the network.
  • Data Suppression: When the data is redundant such as the same sensor reading sent multiple times, it is suppressed, minimizing unnecessary transmissions. This is particularly significant in Wireless Sensor Networks to save energy and bandwidth.
  1. Advanced Features for Data Suppression

We can expand this simulation by adding more advanced characteristics:

  • Data Aggregation: Rather than suppressing data, aggregate data from multiple nodes into a single transmission to diminish the number of packets.
  • Threshold-based Suppression: Execute a threshold-based suppression mechanism in which data is only forwarded if the change in data such as temperature change exceeds a particular threshold.
  • Priority-based Suppression: Execute a priority system in which only high-priority data is transmitted, and low-priority data is suppressed during congestion.
  • Time-based Suppression: Execute time-based suppression, in which the data is only forwarded if it hasn’t been sent for a particular period of time like once every minute.

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