Sensor Networks: Next Generation Problems

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Sensor Networks Next Generation Problems
SAMSI Sensor Network Workshop 14-15 October 2003

• Frank Vernon
• Scripps Institution of Oceanography
• University of California at San Diego

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Open problems

• How can I acquire desired RT data?
• How can I discover/access desired RT data?
• How can I share/integrate the data?
• Can I integrate dynamically?
• Can I share with other disciplines?
• Can I integrate seamlessly with data from other
  disciplines
• Can I integrate with archived data?

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Sensor Networks Desires

• Timing
• Critical issue for any modal analysis or array
  processing analysis
• Need to synchronize across all sensors
• Communications systems
• Power lt 1W for remote sites
• IP
• Aggregate data rate 1 Mbit/sec
• Scalable for array apertures from 100s meters
  gt megameters

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What is needed for a real-time data exchange
systems

• System should be data neutral
• Variable packet size
• All formatting at application level
• System should allow data query functions
• System should allow dynamic updates of instrument
  metadata
• metadata not embedded in every data packet
• Packet descriptions should be available in
  real-time
• Self-describing

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What is needed for a real-time data exchange
systems

• System should be network transparent with respect
  to read/write/local/remote access
• System should be error-free and robust
• Impervious to communications failures
• Impervious to computer shutdown-startup
• Generally means non-volatile buffers,
  auto-reconnects, auto-restarts, etc.
• Interoperable with other real-time data exchange
  systems and new real-time data sources

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Design Goals for FutureReal-Time Sensor Networks

• capture, process, control for quality, and
  integrate real-time data streaming from different
  sources--collected for different purposes, on
  different time and spatial scales, and measured
  by different methods
• make heterogeneities in platforms, physical
  location and naming of resources, data formats
  and data models, supported programming
  interfaces, and query languages transparent to
  the user
• adapt to new and changing user requirements for
  data and data products

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Design Goals for FutureReal-Time Sensor Networks

• dynamically reconfigure with the addition or
  removal of observational equipment and/or
  scientific instrumentation
• self-healing topology
• decentralized resource registration
• provide Internet access to integrated data
  collections along with visualization, data
  mining, analysis, and modeling capabilities

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