Wireless Sensor Networks A Reliable Distributed System

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Wireless Sensor Networks A Reliable Distributed
System

• - Spardha Jaiswal

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What are WSN ?
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What will I talk about ?

• Stateless and Stateful Routing
• Peer-to-Peer Environment (JXTA)
• RPC in WSN
• Fault Management
• Group Communication
• Synchronization
• Scalability
• Autonomic Properties
• Conclusion

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Stateful Routing

• Stateful Routing Schemes SP (Shortest Path)
• - AODV (Ad hoc On-demand Distance Vector)
• - generates routes on Demand
• - unicast or multicast
• - DSR (Dynamic Source Routing Protocol)
• - Route Discovery and Route Maintenance
• - on demand as well

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Stateless Routing

• Stateless Routing Schemes
• - GPSR (Greedy Perimeter Stateless Routing)
• - depends on position of router
• - Greedy Forwarding
• - PSGR (Priority-based Stateless
  Geo-Routing in Wireless Sensor Networks)
• - Volunteer Routing for location based
  services

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Peer-to-Peer Environment

• A Peer-to-Peer Environment for Monitoring
  Multiple Wireless Sensor Networks Antoniou et.
  al
• ShareSense uses JXTA software solution for WSN
• JXTA set of protocols and specifications for P2P

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Peer-to-Peer Environment (II)

• Routing Peers, Gateway Peers, User Peers
• Applications - The Resource Discovery Service,
  The Query Handling Service
• Google Earth for GUI

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Peer-to-Peer Environment (III)
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RPC in WSN

• An RPC Design for Wireless Sensor Networks -
  Terry D. May, Shaun H. Dunning, Jason O.
  Hallstrom
• Similar to Java RMI or CORBA
• Language Extension to provide Remote Operations
• Compiler for communication Infrastructure

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RPC in WSN (II)
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RPC in WSN (III)
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Fault Management

• Fault Management in EventDriven Wireless Sensor
  Networks - Linnyer Beatrys Ruiz et al
• Power Supply restriction, Node Failure,
  Communication Failure, External Factors
• Failure Detection - If there is no data from the
  nodes
• One method Listen in on the neighbors

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Fault Management (II)

• Another Method using MANNA management service
• node distribution, node self-test, node
  localization discovery, self-organization,
  network operating parameters configuration
• Simulation

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Group Communication

• Secure Group Communication in Wireless Sensor
  Networks - Subhas K. Ghosh et al.
• Single Master Key for the whole network
• Key ring Set of Keys
• Broadcasting
• Secure Join Protocol

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Synchronization

• Time Synchronization for Wireless Sensor Networks
  - Jeremy Elson and Deborah Estrin
• NTP is not a good choice because nodes consume a
  lot of power
• post-facto synchronization event timestamps are
  generated while node is off

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Scalability

• Dynamic Architecture Adaptation to Improve
  Scalability of Sensor Networks A Case Study for
  a Smart Sensor for Face Recognition - Yulei Weng
  et al.
• Dynamically adapt to the sensor node architecture
  by reconfiguration
• variable amounts of input data, decreasing energy
  levels, modifying latency constraints, different
  quality of service needs, and so on

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Autonomic Properties

• Autonomic wireless sensor networks - David Marsh
  et al
• self-healing, self-protection, self-optimization
  and self-configuration
• Eg. Environmental Nervous System (ENS)

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Autonomic WSN
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Conclusion

• A Wireless Sensor Network shows all the
  Properties of a Reliable Distributed System !

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References

• http//en.wikipedia.org/wiki/Wireless_sensor_netwo
  rk
• http//en.wikipedia.org/wiki/JXTA
• http//www.cs.cmu.edu/hcwong/Pdfs/MSWiM04.pdf
• http//www.circlemud.org/jelson/writings/timesync
  /timesync.html

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References (II)

• http//www.sinc.sunysb.edu/Stu/skallaku/RTSS04f.pd
  f
• http//tinyoside.ucd.ie/publications/tynanAutonomi
  c05.pdf

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Thank you !

• QUESTIONS ???
• COMMENTS !!!