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WSN Simulation Template for OMNeT++. Stefan Dulman s.o.dulman@utwente.nl. Presentation Overview. OMNeT++ Introduction Sensor Network Template Implementation Example Discussion and future work. OMNeT++ Introduction. OMNeT++ Features.

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wsn simulation template for omnet

WSN Simulation Templatefor OMNeT++

Stefan Dulman

s.o.dulman@utwente.nl

presentation overview
Presentation Overview
  • OMNeT++ Introduction
  • Sensor Network Template
  • Implementation Example
  • Discussion and future work
omnet features
OMNeT++ Features
  • Simulator designed for fixed, wired, distributed systems (such as: computer networks, multiprocessor systems…)
  • Discrete time simulator
  • It is compatible with: DOS, UNIX, WINDOWS (uses C++ and Tcl/Tk)
  • Several graphical interfaces allows easy debugging and variables inspection
  • Offers support for parallel execution
omnet features 2
OMNeT++ Features (2)
  • Simulated objects are represented by modules
    • Modules can be simple or composed (depth of module nesting is not limited)
    • Modules communicate by messages (sent directly or via gates)
    • One module description consists of:
      • Interface description (.NED file)
      • Behavior description (C++ class)
  • Modules, gates and links can be created:
    • Statically - at the beginning of the simulation (NED file)
    • Dynamically – during the simulation
omnet features 3
OMNeT++ Features (3)
  • Support is offered for:
    • Recording data vectors and scalars in output files
    • Random numbers (also from several distributions) with different starting seeds
    • Tracing and debugging aids (displaying info about the module’s activity, snapshots, breakpoints)
  • Simulations are easy to configure using .ini file
  • Batch execution of the same simulation for different parameters is also included
omnet features 4
OMNeT++ Features (4)
  • What is missing or not working as wanted:
    • Mobile entities and wireless communication between them are not included
    • Static data types not allowed
      • For storing data needed by all the modules a central manager has to be created
      • Communication with this entity goes by messages (slow!)
      • Using pointers to it is not always good idea (parallel execution)
    • Execution goes very slow with the increase of the number of messages and when using parameters
    • Very slow 2D graphical interface made in Tk
template description
Template Description
  • What is it:
    • A fully working project consisting of a network of mobile nodes that can communicate by wireless means. The user has only to implement the wanted algorithm, with no concern on how these issues are handled.
    • All the parameters of the network can be changed without any need of rewriting any code
    • Offers (a lot of) easy to use macros for accessing the main functionalities
template description 2
Template Description (2)
  • Characteristics:
    • Implements mobility (Random Way Point alg.)
    • Wireless communication
      • Simulated by dynamically connecting modules within transmission range
    • Unidirectional links
    • Signal strength can be varied from within the nodes
    • Energy management is also included
    • Nodes have failing probabilities
    • Map for area failures can be specified and used
      • Other maps can easily used for obstacles, fading, etc. (implementation is similar)
network architecture
Network Architecture
  • Central Manager
    • Used as a central database
    • Its main function: stores the connectivity map and updates it upon request
    • It takes care of reading additional configuration files and sending the information
    • It is hidden from the display, communication with it is done only with sendDirect() function
  • Sensor nodes
sensor node architecture
Sensor Node Architecture
  • Sensor node architecture:
    • Layer 0
    • Sensor
    • Energy manager
    • Blackboard
    • Application
    • Custom network layers
mobility issues
Mobility Issues
  • Approaches to describe mobility
    • Each node reports its position after a certain interval.
      • Simulation precision depends on this interval.
      • The smallest the interval the longest the simulation time
    • Each node reports the equation of the curve of its movement
      • Manager computes the interaction moments and schedules gates connect/disconnect at those moments
      • Faster execution (almost 4 times in our simulations)
      • More precise simulation
      • Graphical display no longer linked to the simulator precision
  • Random Way Point model as default
energy management
Energy Management
  • Implemented using the blackboard
    • Consumed energy and of the current energy
    • Data can be accessed from anywhere within a sensor node
    • Estimation of the lifetime of the node (can be improved by using any desired estimation function)
    • Warnings can be issued when no energy is left (special behaviours can be implemented in the energy manager; e.g. stop certain components when energy goes beyond a treshhold)
reliability issues
Reliability Issues
  • Two kinds of failures implemented
    • Node failure probability
      • Can be specified for each node separately
      • Available to all the layers inside a node
      • Can be set to change over the time
    • Area failure probability
      • The failure zones are specified as rectangles inside a configuration file
      • Data is available to all the layers
      • It can be given any interpretation needed. Easy to extend to a set of maps
other features 2
Other Features (2)
  • Support for beacons is added (needed by the localization algorithms)
    • A certain number of nodes have fixed positions
    • Any node can find out if it is a beacon or not
  • Each node can be displayed in several ways (useful for debugging and presentations: to highlight the discovered paths, the clusters, etc.)
    • 3 distinct graphical signs and 10 colors for each one
    • Can be modified from anywhere inside the node
    • Modifications are displayed immediately
  • Simulation precision is no longer related to display update
    • User can specify the display rate
work in progress
Work in progress
  • Signal sources:
    • Support for fixed and mobile beacons
    • Support for areas of interest
  • Fixing minor bugs and optimizing the code
    • Rather use new derived classes than parameters
    • Finding the best places to place the functionality (manager or layer0)
  • Trying to create a library of modules
  • WANTED: 3D graphical display !!!
work in progress 2
Work in Progress (2)
  • Tcl/Tk script for:
    • Easy configuration of the network
    • Designing the maps, node initial positions, initial values, etc.
    • Generation of project files
discussions
Discussions
  • Address where to download the template:

http://wwwhome.cs.utwente.nl/~dulman/tools.htm

  • Email address:

s.o.dulman@utwente.nl