garuda - DataDeliveryinWSNs Elements Sink: Sensor:...

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Robust and Energy Efficient  Robust and Energy Efficient  Data Delivery in WSNs Data Delivery in WSNs
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12/15/09 2 Wireless Sensor Network Wireless Sensor Network Elements Sink  : sends queries and collects data from sensors Sensor  : senses phenomenon and reports to sink Indoor Control Application Object Tracking Environment Monitoring Medical Monitoring Sink Sensors Field
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12/15/09 3 Limiting Characteristics of Sensor Networks  Limiting Characteristics of Sensor Networks  Resource constraints Limited battery power • Smart Dust has only 1J Small memory and CPU power Low bandwidth Dynamic network topology Node failures, node mobility Unreliable links Critical tasks with time constraints Large number of nodes No global node identification
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12/15/09 4 Query-response model Query-response model Sink sends out query E.g. report if temperature > 80F Query is flooded out into the network Only sensors that sense temperature greater than          80F respond (data centric routing/querying) Response can be sent back along path that      query came through Alternate models Continuous reporting Event based reporting
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12/15/09 5 Problem Environment Problem Environment Target problem Sink should deliver data to sensors reliably Types of downstream data Control code for a sink to reconfigure sensors  Query for a sink to request information Query-data for a sink to send sensors information Necessity for reliability Wireless channel errors Congestion and Contention Broadcast storm
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This note was uploaded on 12/14/2009 for the course ECE 6610 taught by Professor Staff during the Fall '08 term at Georgia Tech.

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garuda - DataDeliveryinWSNs Elements Sink: Sensor:...

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