Queuing Models in NS2

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M/M/1 is a system with poisson arrival time, servicing exponentially and a queue of unlimited capacity and type of FIFO Queue. This is the simplest queuing system.  NS2 supports various distributions like pareto, exponential, constant, unifrom, etc to handle the network dynamics and metrics. So it is very easy to test the given network link to monitor a given queue using any of these queuing models. The listing 3 and 4 are monitoring the link when DropTail queue is used with a capacity of finite and infinite. Listing 13.3 uses infinite capacity and Listing 13.4 uses Finite capacity The output screen shot is shown below the scripts for further understanding
Listing 3 – M/M/1 Queuing Model #new Simulator creation set ns [new Simulator] #trace file creation for capturing the UDP data set tf [open out.tr w] $ns trace-all $tf
#setting the exponential distribution param set lambda 30.0 set mu     33.0
#creation of nodes set n1 [$ns node] set n2 [$ns node] #The queue limit is 1Lakh as the capacity is infin…

Energy Model in Network Simulator 2 (NS2)

Enabling or using energy for a wireless node is always giving the accurate results. Be default, when node-config is done is NS2, the energy supplied is infinite, means there is no energy log is been carried out.
you can see the following code below:

#Node configuration without energy Model
$ns node-config -addressType hierarchical \

                   -adhocRouting AODV \
                   -llType LL \
                   -macType Mac/802_11 \
                   -ifqType Queue/DropTail/PriQueue \
                   -ifqLen 50 \
                   -antType Antenna/OmniAntenna \
                   -propType Propagation/TwoRayGround \
                   -phyType Phy/WirelessPhy \
                   -topologyInstance \$topo \
                   -channel Channel/WirelessChannel \
                   -agentTrace ON \
                   -routerTrace ON \
                   -macTrace OFF \
                   -movementTrace OFF

#here is the change in which you can enable the energyModel for Wireless networks
$ns node-config -addressType hierarchical \
                   -adhocRouting AODV \
                   -llType LL \
                   -macType Mac/802_11 \
                   -ifqType Queue/DropTail/PriQueue \
                   -ifqLen 50 \
                   -antType Antenna/OmniAntenna \
                   -propType Propagation/TwoRayGround \
                   -phyType Phy/WirelessPhy \
                   -topologyInstance \$topo \
                   -energyModel "EnergyModel" \
                   -initialEnergy 3.4 \
                   -txPower 0.33 \
                   -rxPower 0.1 \
                   -idlePower 0.05 \
                   -sleepPower 0.03 \
                   -channel Channel/WirelessChannel \
                   -agentTrace ON \
                   -routerTrace ON \
                   -macTrace OFF \
                   -movementTrace OFF

in the above code, the red colored code indicates the enabling of energy Model for a given network.
Here, the initial Energy is given in Joules (but you need not specify the unit)
and the txPower, rxPower, sleepPower and idlePower are given the units in Watts (here also no unit need to be specified)
As you aware of the formula: Energy = Power * time 

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