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…

BonnMotion - A mobile scenario Generator Tool

BonnMotion is a tool that generates scenario for ns2, ns3, qualnet, etc. This will comfortably work with Linux. And in windows, there could be some bugs.

Please refer the documentation here: http://sys.cs.uos.de/bonnmotion/doc/BonnMotion_Docu.pdf

To use this tool for ns2, here are the steps.
Step1 : Download the BonnMotion tool from this website
Step 2: Unzip it to home folder (/home/pradeepkumar in my case)
step 3: Here are the commands to install
$] unzip -d bonnmotion-2.1.3.zip
$] cd bonnmotion-2.1.3/
$] ./install 
The above command will install, if any packages are missing for dependencies, please install it.

$] Once installed, copy the bonnmotion-2.1.3/bin/bm file to /usr/bin/ for running it anywhere. if not go to bin folder using the command given below

$] cd bonnmotion-2.1.3/bin/

To run BonnMotion
$bonnmotion-2.1.3/bin] ./bm -hm 
(this will list all the models)

$bonnmotion-2.1.3/bin] ./bm -hm RandomWaypoint
Will display all the parameters for RandomWaypoint like number of nodes, x, y, random seed, etc.

Assuming RandomWaypoint is the model

$bonnmotion-2.1.3/bin] ./bm -f scenario RandomWaypoint -n 10 -x 500 -y 500
The above command will create a file called scenario with 10 number of nodes with x and y as 500x500)

$bonnmotion-2.1.3/bin]  ./bm NSFile -f scenario
This will create two files called scenario.ns_movements, scenario.ns_params


The above two files can be used inside tcl script for ns2 using the source command

source scenario.ns_params
source scenario.ns_movements



(NB: Please note that the above two files represents nodes like $node_(0), etc and $ns_ as simulator object, either you change these variables within your tcl file or edit the above two files.  Also scenario.ns_params file shows the stop script as set val(duration) 600.0, but most of the tcl scripts may have val(stop), so change it to val(duration) in all cases) 


The same will be applied to other simulators also, refer the documentation given in the beginning of the slide.

Some screenshots for you.:

Bonnmotion
Installing Bonnmotion

Bonnmotion
bm command with options

Bonnmotion
A Sample Tcl file using the script generated by BonnMotion

Download the sample files here: put all the files in a single folder and run the tcl file using
$] ns ex.tcl

Provide your comments below, if you need any queries.

Credits to:  http://sys.cs.uos.de/bonnmotion/index.shtml



 T S Pradeep Kumar

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