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How to find Residual Energy of the nodes in NS2?


The energy model represents the energy level of nodes in the network. The energy model defined in a node has an initial value that is the level of energy the node has at the beginning of the simulation. This energy is termed as initialEnergy_. In simulation, the variable “energy” represents the energy level in a node at any specified time. The value of initialEnergy_ is passed as an input argument. A node looses a particular amount of energy for every packet transmitted and every packet received. As a result, the value of initialEnergy_ in a node gets decreased. The current value of energy in a node after receiving or transmitting routing packets is the residual energy. Data Transmission is established between nodes using UDP agent and CBR traffic. Residual energy of the node is evaluated by accessing inbuilt variable “energy” in findEnergy procedure at different times.

Sample Code

#Filename: sample24.tcl

#******RESIDUAL ENERGY ***************************88

#***********ENERGY MODEL ***************************88

# Simulator Instance Creation
set ns [new Simulator]

#Fixing the co-ordinate of simutaion area
set val(x) 500
set val(y) 500
# Define options
set val(chan) Channel/WirelessChannel ;# channel type
set val(prop) Propagation/TwoRayGround ;# radio-propagation model
set val(netif) Phy/WirelessPhy ;# network interface type
set val(mac) Mac/802_11 ;# MAC type
set val(ifq) Queue/DropTail/PriQueue ;# interface queue type
set val(ll) LL ;# link layer type
set val(ant) Antenna/OmniAntenna ;# antenna model
set val(ifqlen) 50 ;# max packet in ifq
set val(nn) 10 ;# number of mobilenodes
set val(rp) AODV ;# routing protocol
set val(x) 500 ;# X dimension of topography
set val(y) 400 ;# Y dimension of topography
set val(stop) 10.0 ;# time of simulation end
set val(energymodel) EnergyModel ;#Energy set up
# set up topography object
set topo [new Topography]
$topo load_flatgrid $val(x) $val(y)

#Energy details file
set energy_file [open w]

# general operational descriptor- storing the hop details in the network
create-god $val(nn)

#Transmission range setup

#********************************** UNITY GAIN, 1.5m HEIGHT OMNI DIRECTIONAL ANTENNA SET UP **************

Antenna/OmniAntenna set X_ 0
Antenna/OmniAntenna set Y_ 0
Antenna/OmniAntenna set Z_ 1.5
Antenna/OmniAntenna set Gt_ 1.0
Antenna/OmniAntenna set Gr_ 1.0

#********************************** SET UP COMMUNICATION AND SENSING RANGE ***********************************

#default communication range 250m

# Initialize the SharedMedia interface with parameters to make
# it work like the 914MHz Lucent WaveLAN DSSS radio interface
$val(netif) set CPThresh_ 10.0
$val(netif) set CSThresh_ 2.28289e-11 ;#sensing range of 500m
$val(netif) set RXThresh_ 2.28289e-11 ;#communication range of 500m
$val(netif) set Rb_ 2*1e6
$val(netif) set Pt_ 0.2818
$val(netif) set freq_ 914e+6
$val(netif) set L_ 1.0
# configure the nodes
$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 \
-energyModel $val(energymodel) \
-initialEnergy 10 \
-rxPower 0.5 \
-txPower 1.0 \
-idlePower 0.0 \
-sensePower 0.3 \
-agentTrace ON \
-routerTrace ON \
-macTrace OFF \
-movementTrace ON

# Node Creation

for {set i 0} {$i < 3} {incr i} {

set energy($i) [expr rand()*500]

$ns node-config -initialEnergy $energy($i) \
-rxPower 0.5 \
-txPower 1.0 \
-idlePower 0.0 \
-sensePower 0.3

set node_($i) [$ns node]
$node_($i) color black



find Residual Energy of the nodes in NS2
Residual Energy of the nodes