integration of sensor networks with mobile devices
DESCRIPTION
Computer Science Department University College London. Integration of Sensor Networks with Mobile Devices. Vladimir Dyo November 22, 2005. Outline. Introduction Problem and Motivation Isolating Problems Expected Contribution Initial Research Results Conclusion. - PowerPoint PPT PresentationTRANSCRIPT
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Integration of Sensor Networks with Mobile Devices
Computer Science Department
University College London
Vladimir Dyo
November 22, 2005
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Outline
Introduction Problem and Motivation Isolating Problems Expected Contribution Initial Research Results Conclusion
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Data Dissemination in SensorNets
The Concept Sensors, Sinks
Tasks: Dissemination, Aggregation, Streaming Limitation: Energy, Low Reliability
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Current Research
Infrastructure Routing
GPSR
Clustering LEECH
Data Dissemination and Aggregation protocols Directed Diffusion, TAG, Synopsys Diffusion
Middleware Milan, TinyLime, Slime, EnviroTrack
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Problem - I
Existing solutions work with static sinks:Very strong assumptionNot Realistic Not Energy Efficient No Coverage
Examples: TinyDB, Cougar
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Problem - II: Example
Static collection:• Energy
consumption• Congestion• Reliability• Not practical
Suggested Approach: Mobile Collection
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Solution – Mobile Collection
Technical Advantages Coverage, energy, disconnected operations, flexibility
Application Potential Environmental monitoring, industrial and pervasive
applications
Not Well Researched
•M. Batalin, “Coverage, Exploration and Deployment by a Mobile Robot and Communication Network”
•A. Chakrabarty, “Exploiting Predictable Observer Mobility For Power Efficient Sensor Network Configuration”
• “S. Bhattacharya, Energy-conserving Data Placement and Asynchronous Multicast in WSN”
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Isolating Problems
Protocol Support Mobile Data Collection. Routing Data towards a
mobile collector Spatial Queries and Distributed Index
select locations where (temp > 30) OR (humidity > 0.4) within 30km from (X,Y)
Middleware Defining Primitives Implementing Protocols
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Expected Contribution
Protocols Data Collection Protocol for Mobile Collectors Distributed Index for Spatial Queries in Sensor
Networks Middleware for integration of sensor networks
with mobile devices Architecture Primitives Implementation
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Evaluation
Data Collection Protocol: Performance analysis in ns-2 simulator Critical Metric – total communication overhead Real traces from other projects Implementation in TSky motes
Middleware Implementation Real Deployment
Climate and wildlife monitoring (in collaboration with Oxford zoologists)
Micro-climate monitoring (UCL campus)
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Initial Results
Adaptive Distributed Indexing for Spatial Queries in Sensor Networks.
V. Dyo and C. Mascolo. In IEEE Proceedings of 8th International Workshop on Mobility in Databases and Distributed Systems (co-located with DEXA05). August 2005, Copenhagen, Denmark. IEEE Computer Society Press
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Proactive + Reactive Mode
Proactive = 3600Proactive = 1
Reactive = 1200Reactive = 1200
600 query/hourTotal: 3601Total:
2400
Total: 1201
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Future work on Index
Data Resolution High update rates High Power
Consumption Low response
Low latency High Power Consumption Trade-off between:
Data resolution/response latency Total energy consumption
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Conclusion
Interesting problem Isolating issues Initial results