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Interference and Service Discovery in Multi-Hop Ad Hoc Networks

Interference and Service Discovery in Multi-Hop Ad Hoc Networks. Alex Varshavsky University of Toronto. Multi-Hop Mobile Ad Hoc Networks (MANETs). Wireless medium Mobile nodes No fixed infrastructure Each node acts as router Applications Relief operations Battlefield. A. F.

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Interference and Service Discovery in Multi-Hop Ad Hoc Networks

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  1. Interference and Service Discovery in Multi-Hop Ad Hoc Networks Alex Varshavsky University of Toronto

  2. Multi-Hop Mobile Ad Hoc Networks (MANETs) • Wireless medium • Mobile nodes • No fixed infrastructure • Each node acts as router • Applications • Relief operations • Battlefield A F

  3. Interference in MANETs

  4. Multi-hop Networks No Spatial Reuse C D E F B A

  5. Multi-hop NetworksSpatial Reuse C D E F B A

  6. Throughput Measurement • Chains of different length • Traffic pattern • Constant Bit Rate (CBR) … …

  7. 55% Drop CBR Throughput

  8. DATA DATA Collision Wireless Transmission CSMA/CD doesn’t work Use CSMA/CA Hidden terminal A B C

  9. Interference Range A B C D DATA Interference Range = 550m Transmission Range = 250m

  10. Collision DATA DATA The Hidden Terminal Problem A B C D E F

  11. CBR Throughput • Self-interference • Throughput depends • route length • sending rate

  12. Service Discovery in MANETs

  13. MANET in Action I act as Video Redirector Gee…I wear a Video Camera Cool !

  14. MANET in Action Now I act as Video Redirector I still wear a Video Camera

  15. Service Location Protocol (SLP) • Discover services • Two modes of operation • Centralized • Distributed

  16. Service Location Protocol (SLP)Centralized Mode Camera Video Redirector Register “video redirector” Find “video redirector” ! S2 C User Agent Service Agent D Register “video redirector” S1 Find “video redirector” ! Directory Agent

  17. Service Location Protocol (SLP)Centralized Mode Camera Video Redirector Register “video redirector” Find “video redirector” ! S2 C User Agent Service Agent D Register “video redirector” S1 Find “video redirector” ! Directory Agent

  18. Service Location Protocol (SLP)Centralized Mode I found the video redirector Camera Video Redirector Register “video redirector” Find “video redirector” ! S2 C User Agent Service Agent D Register “video redirector” S1 Find “video redirector” ! Directory Agent

  19. Service Location Protocol (SLP)Distributed Mode Camera Video Redirector Register “video redirector” Find “video redirector” ! S2 C User Agent Service Agent Find “video redirector” ! S1

  20. Service Location Protocol (SLP)Distributed Mode I found the video redirector Camera Video Redirector Register “video redirector” Find “video redirector” ! S2 C User Agent Service Agent Find “video redirector” ! S1

  21. Service Discovery in MANETs • Centralized • Hard to maintain • Easy to lose • Distributed • Large overhead • Large overhead

  22. Can we do better ?

  23. Maybe

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