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…

Internet of Things and 6LoWPAN

This post tells you about the concepts behind
  1. Internet of Things
  2. Why we need IoT
  3. What Demands IoT
  4. What are the features of 6LoWPAN
  5. 6LoWPAN characteristics 
  6. Impact of 6LoWPAN
  7. Open Network for IoT
  8. 6LoWPAN supporting Operating Systems
  9. Contiki OS, RIOT OS and Tiny OS 
  10. Comparison of various OS for IoT
  11. A simple demo of CoAP Protocol 

Please see this video 
2016-11-23 15.00 Internet of Things and 6LoWPAN from Techgig on Vimeo.


See the Video on Constrained Application Protocol (CoAP) using Contiki OS


T S Pradeep Kumar

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