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Deployment Analysis in Underwater Acoustic Wireless Sensor Networks Dario Pompili, Tommaso Melodia,...
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Transcript of Deployment Analysis in Underwater Acoustic Wireless Sensor Networks Dario Pompili, Tommaso Melodia,...
Deployment Analysis in Underwater Acoustic Wireless Sensor Networks
Dario Pompili, Tommaso Melodia, lan F. AkyildizACM WUWNet’06
2008. 12. 9.Ahn Jung-Sang
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Content
• Introduction
• Communication Architectures
• Deployment Strategies in 2D
• Deployment Strategies in 3D
• Conclusion
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Introduction
• Underwater Acoustic Sensor Network (UW-ASN)– Challenges
• Harsh environment• Limited bandwidth• High & variable propagation delay, error rates• Etc.
• This Paper– Propose a mathematical & hydrodynamics model in 2D
• Considering depth, current, and so on.• Determine the minimum number of sensors• Provide guidelines on how to choose the optimal deploy-
ment– And extend this 3D briefly
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Communication Architec-tures
• 2D Architecture
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Communication Architec-tures
• 3D Architecture
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Deployment in 2D
• Triangular-grid Coverage Properties– Sensors with same sensing range r– Optimal deployment to cover a 2D area with minimum
number of sensors
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Deployment in 2D
• Triangular-grid Coverage Properties– Sensing coverage η
– We can estimate d/r when we set η.• In this paper, η=0.95, and corresponding d/r = 1.95
Overlap
Non-overlap
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Deployment in 2D
• Triangular-grid Coverage Properties
Coverage=0.95
Ratio of sensor distance and sensing range=d/r=1.95
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Deployment in 2D
• Triangular-grid Coverage Properties
100 x 100 m^2 300 x 200 m^2
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Deployment in 2D
• Trajectory of a Sinking Object
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Deployment in 2D
• Trajectory of a Sinking Object
– Assumptions in this paper:• No vertical movement of ocean water• The considered area is neither an upwelling nor a down-
welling• The velocity of the ocean current depends on depth
– H: # of different ocean current layers– Current in each layer has a fixed module and angular
deviation (with known statistics)– Thermohaline Circulation (ocean’s conveyor belt)
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Deployment in 2D
• Trajectory of a Sinking Object– Kind of Hydrodynamics
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Deployment in 2D
• Trajectory of a Sinking Object
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Deployment in 2D
• Communication Properties of 2D UW-ASNs– Every sensed data should pass gate-way– Sensor & gate-way have different weights
• Gate-way is heavier than sensor
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Deployment in 2D
• Deployment Surface Area: Side Margins
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Deployment in 3D
• 3 Strategies– 3D-random
• The simplest strategy.• Random deploy, random depth.
– Bottom-random• Random deploy.• Surface station calculates the depth for each sensor.
– Bottom-gird• Assisted by one or multiple AUV• Grid deploy.• Assigned a desired depth by the AUV
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Deployment in 3D
• 3 Strategies
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Conclusion
• Deployment strategies for 2D and 3D architec-tures for UW-ASNs
• Deployment analysis in order to:– Determine the minimum number of sensors– Provide guidelines on how to choose the deployment– Determine the minimum number of uw-gateways, given
some desired communication properties of clusters