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Emulation of large scale WSN: from real neighbors to imaginary destination

Emulation of large scale WSN: from real neighbors to imaginary destination. Bogdan Pavković, Jovan Radak, Nathalie Mitton, Franck Rousseau, Ivan Stojmenović INRIA Lille – LIG, Grenoble INP – SITE, University of Ottawa AdHocNow, 11 july 2012. motivation. Simulation:

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Emulation of large scale WSN: from real neighbors to imaginary destination

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  1. Emulation of large scale WSN: from real neighbors to imaginary destination Bogdan Pavković, Jovan Radak, Nathalie Mitton, Franck Rousseau, Ivan Stojmenović INRIA Lille – LIG, Grenoble INP – SITE, University of Ottawa AdHocNow, 11 july 2012

  2. motivation • Simulation: • not realistic & reliable radio medium models • complex models (propagation, interference) • scaling-up : memory, computation time • Real world experiments: • complex to realize • sensor positioning, administration • scaling-up: price, space, man power

  3. Emulation – different definitions • General: Overcome imprecisions of the simulation without the need to confront to the problems of real-world tests • Goals: repeatability, scaling-up, decrease price • Network emulation: • communication between real and simulated nodes • Environment emulation: • sensor readings injection

  4. Basic principle • Emulation with real nodes • Random 1-hop neighborhood around a central node • Emulate a large network by re-executing each new hop on the same core neighborhood

  5. Impairments of the basic approach • Same 1-hop neighborhood nodes: • fixed density at start • similar potential forwarders • Add random rotation? • Does not support face routing: • going around the network holes (voids)

  6. Hexagonal neighborhood • Regular structure: • translation, rotation • Dense neighborhood: • activate sub-section to vary density

  7. New idea - example

  8. Real-world verification • Basic version - 43 nodes WSN430 • Initialization phase: measure & calculate the radio link metrics (ETX) • Geographic routing • Results

  9. Simulation comparison • Hexa version - ~1000 simulated nodes • WSNetsimulator • Same geographic routing + LEARN-G • Simulate the emulation process (PHY as well) • Comparison: whole network simulation vs emulation Network

  10. Results • Almost the same results for both cases

  11. Limitations • We “follow” a single packet • No interfering traffic • Imprecision in node position approximation

  12. Generate interferences

  13. Conclusion • Analyze the behavior of large network (10K+) with only small set of core nodes • Repeatability • Real PHY layer • Reduced cost and complexity • Density control • Interesting for some problems e.g. routing

  14. Future work • Final test: large real network vs. emulation • GreenOrbs / SensLab • does it make sense ? • Simulation < Emulation < Real-world? • Add interferences • Follow more packets – remember states • Mobility (?)

  15. Thank you Questions ?

  16. Emulation of large scale WSN: from real neighbors to imaginary destination Bogdan Pavković, Jovan Radak, Nathalie Mitton, Franck Rousseau, Ivan Stojmenović INRIA Lille – LIG, Grenoble INP – SITE, University of Ottawa AdHocNow, 11 july 2012

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