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PANEL Ubiquitous Systems
Ubiquity for Everyone: What is Missing?
Ann Gordon-Ross
Department of Electrical and Computer Engineering
University of Florida, Gainesville, Florida, USA
Also affiliated with the NSF Center for High-Performance Reconfigurable
Computing (CHREC)
Proliferation of Wireless Sensor
Networks
Security and
Defense Systems
Industrial
Automation
Health Care
Space
Logistics
Ambient conditions
monitoring e.g.
forest fire detection
Typical Wireless Sensor Network
Application managers typically non-experts
e.g. agriculturist, biologist, etc.
Network
Application manager/designer
Sensor nodes
Gateway node
Sensor field
Sink node
Challenges in Wireless Sensor Network
Design
What is
Commercial
off-the-shelf
sensor nodes
frequency?
How does it
affect lifetime?
Characteristics
 Generic Design
 Not Application Specific
 Few Tunable Parameters
Tunable Parameters
Processor Voltage = 2.7 V
Processor Frequency = 4 MHz
Sensing Frequency = 1 sample per second
Radio Transmission Power = -17dBM
Application Metrics
Values
Lifetime = 3 years
Reliability = < 25% pkt loss
Security = WEP
Responsiveness = < 5 seconds
after detection
Ubiquity in Wireless Sensor Network
Design
CHALLENGING!!
• Lifetime = High Importance
• Reliability = Medium Importance
• Security = Low Importance
• Responsiveness = High Importance
Conceptually Ideal
• Processor Voltage = 2.7 V
• Processor Frequency = 4 MHz
• Sensing Frequency = 1 sample per second
• Radio Transmission Power = -17 dBm
Dynamically Optimize
Tunable Parameter
Values to Meet
Application Metrics
With Respect to the
Operating
Environment