Queuing Models in NS2

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…

Wireless Node Configuration in Network Simulator 2 (NS2)

The node configuration in ns2 is a special task in which the number of nodes can be configured for a set of parameters. The following table tells about the node  configuration parameters as defined in the ns-lib.tcl

The readers are requested to refer the ns-lib.tcl file for more information.

Option Available Values Remarks
addressType flat, hierarchichal  
MPLS ON,OFF Multi protocol Label Switching
wiredRouting ON, OFF  
llType LL, LL/Sat Link Layer
macType Mac/802_11, Mac/Csma/Ca, Mac/Sat, Mac/Sat/UnslottedAloha, Mac/Tdma Medium Access Control
ifqType Queue/DropTail, Queue/DropTail/PriQueue Interface Queue type
phyType Phy/wirelessPhy, Phy/Sat Physical Layer Type
propType Propagation/TwoRayGround, Propagation/Shadowing Propagation Type
antType Antenna/OmniAntenna, Antenna type
Channel Channel/WirelessChannel, Channel/Sat Channel to be used
mobileIP ON,OFF to set the IP for Mobile or not
energyModel EnergyModel energy model to be enabled or not
initialEnergy <joule> in terms of joules (Ex: 3.24)
txPower   Power in terms of Watts (0.32)
rxPower   Power in terms of Watts (0.1)
idlePower   Power in terms of Watts (0.02)
agentTrace ON, OFF Tracing to be on or off
routerTrace ON, OFF Tracing to be on or off
macTrace ON, OFF Tracing to be on or off
movementTrace ON, OFF Tracing to be on or off
errProc UniformErrorProc  
toraDebug ON, OFF  


An Example

$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

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