Queuing Models in NS2

Image
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…

Finding the Node Position, speed and Velocity of a Node while using AODV

Finding the Node Position, speed and Velocity of a Node while using AODV

Steps
1. ~ns-2.34/aodv/aodv.h
include the following header line in aodv.h

   1: #include<mobilenode.h>
2.In protected scope declare the variables you would be using to store the node parameters.


   1: double xpos;
   2: double ypos;
   3: double zpos;
   4: double iEnergy;
   5: int node_speed;
   6: MobileNode *iNode;
   7: FILE *fp;

3.In aodv.cc initialize the declared variables.



   1: xpos = 0.0;
   2: ypos = 0.0;
   3: zpos = 0.0;
   4: node_speed = 0;
   5: iEnergy=0.0;
   6: fp=fopen("pradeep.csv","w");
   7: MobileNode *iNode;

4.Finally access the required functions from mobilenode.h. Paste the following lines in the AODV::forward() function


//Code by pradeepkumar
/***This code retrieves node 
position*****/
fprintf(fp,"Position is, X, Y, Z, Velocity is, X, Y, Z, 
Velocity, Node Speed, Energy \n");
iNode = (MobileNode*) 
(Node::get_node_by_address(index));
((MobileNode *) 
iNode)->getLoc(&xpos,&ypos,&zpos);
//Position of %d , X, Y, 
Z
fprintf(fp,"%d,%f,%f,%f,", index, xpos, ypos, zpos);
/***This code retrieves the nodes velocity*****/
iNode = (MobileNode*) 
(Node::get_node_by_address(index));
((MobileNode *) 
iNode)->getVelo(&xpos, &ypos, &zpos);
//Velocity of %d , X, Y, 
Z
fprintf(fp,"%d,%f,%f,%f,", index, xpos, ypos, zpos);
/***This code retrieves the nodes speed*****/
iNode = (MobileNode*) 
(Node::get_node_by_address(index));
node_speed = ((MobileNode *) 
iNode)->speed();
iEnergy=iNode->energy_model()->energy();
//Velocity 
of %d , Node Speed in m/s Energy in joules 
fprintf(fp,"%d,%d,%f,", index, 
node_speed,iEnergy);

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