dissertation defence
DESCRIPTION
Dissertation defenceTRANSCRIPT
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Deployment Techniques in
Wireless Sensor Networks with
Guaranteed Coverage and
Lifetime
Student: Chun-Han Lin
Advisor: Prof. Chung-Ta King
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Wireless Sensor Network (WSN)
2011/8/11 2
Crossbow Mica2
Sense: light, motion, temperature, magnetic fields, gravity, humidity,
vibration, pressure, electrical fields, sound, ...
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Project Testbed
2011/8/11 3
http://fiji.eecs.harvard.edu
/Volcano
http://db.csail.mit.edu/
http://www2.ece.ohio-state.edu/~ekici/
Harvard moteLab
COMMON Sense project
http://www.csail.mit.edu/
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Importance of Deployment Technique
2011/8/11 4
Coverage
Detection ratio
Connectivity
Fault tolerance
…
Lifetime
Energy
Maintenance
Deployment cost
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Design of Deployment Technique
2011/8/11 5
Various WSN systems
Different requirements
Developing 3 techniques
Indoor robot navigation
Debris-flow observation
Environment surveillance
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2011/8/11 6
Space navigation
Security
Housekeeping
Delivery
Medical
…
Localization
Positioning sensor
A set of sensors can provide localization service
Wireless
Infrastructure
Coverage
http://www.worldrobotics.org/
Indoor Robot Navigation
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Challenge
2011/8/11 7
Traditional deployment
Full coverage
Tradeoff
Cost Coverage
How
Reducing sensor
Where
Keeping coverage
Acceptable error
Positioning sensor
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Error Model
2011/8/11 8
Target model
x’= x + d cos(q+r)
y’= y + d sin(q+r)
q’=(q+r) mod 2p
Actual configuration P(f)
Configuration error
err(f)=max(P(f) – f)
|err(f)|
=|max(P(f) – f)|
=(max((P(x) – x)2 +
(P(y) – y)2))1/2 Positioning sensor
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Minimum Deployment-set Problem
2011/8/11 9
Minimum Deployment-set
Problem (G, Errmax)
Width of hallway
Width of track
…
The minimum
deployment-set problem is
NP-hard
Vertex cover problem
Deployment procedure
Initial construction
Divide and conquer
Refinement
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Performance Evaluation
2011/8/11 10
Size of deployment set
Configuration error
Chun-Han Lin and Chung-Ta King, "Sensor-Deployment Strategies for Indoor Robot Navigation," in IEEE Transactions
on Systems, Man and Cybernetics, Part A: Systems and Humans, vol. 40, pp. 388-398, 2010.
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Debris-Flow Observation
2011/8/11 11
Water course
Debris flow
Sensor
Collecting information
Water bank
Challenge
How to collect information
from outside
Where
Coverage
農委會水土保持局
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Deployment Problem
2011/8/11 12
Track
Activity region
No deployment
Information
Uniform distribution
Coverage
Point coverage
Area coverage
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Periphery Deployment Problem
2011/8/11 13
Periphery Deployment
Problem (A, T, R, CPmin)
Solvable?
Maximal coverage
Ideal deployment
Upper bound
Practical deployment
Expected value
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Deployment Procedure
2011/8/11 14
Ideal deployment Initial deployment
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Performance Evaluation
2011/8/11 15
Size of deployment set
Chun-Han Lin, Huang-Chen Lee and Chung-Ta King, “Periphery Deployment for Wireless Sensor Systems
with Guaranteed Coverage Percentage,” submitted to Journal of Systems and Software, 2nd revision.
Coverage
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Environment Surveillance
2011/8/11 16
Fixed locations
Sense
Collection
Record
Analysis
How to prolong lifetime?
Equipping more energy
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Energy Allocation
2011/8/11 17
Uniform battery
Long lifetime => huge energy
Reducing maximum
Customizing sensor
Can we use general sensor?
Adjustable energy
Multiple sensors
Multiple battery packs
Challenge
Energy allocation
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Constrained Multiple Deployment Problem
2011/8/11 18
Constrained Multiple
Deployment Problem (G,
, B, T)
Sense
Collection
Optimal solution
Conservation of flow
Energy consumption
Optimal goal
Cost Bound
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Deployment Procedure
2011/8/11 19
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Performance Evaluation
2011/8/11 20
Deployment cost Residual energy
Chun-Han Lin, Chung-Ta King, and Ting-Yi Chen, "Constrained multiple deployment problem in wireless sensor
networks with guaranteed lifetimes," accepted and to appear in ACM Wireless Networks (WINET).
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Conclusion
2011/8/11 21
Analysis 3 applications
Indoor robot navigation: guaranteed coverage
Debris-flow observation: guaranteed coverage
Environment surveillance: guaranteed lifetime
Problem formulation
Deployment procedure
Performance evaluation
Future Work
Algorithm improvement
Complexity of periphery and multiple deployments
The results of multiple deployment compare with those of ILP
Publication procedure
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Publications
2011/8/11 22
JOURNAL PAPERS
Chun-Han Lin, Chung-Ta King, and Ting-Yi Chen, “Constrained multiple deployment problem in wireless sensor networks with guaranteed lifetimes,” accepted and to appear in ACM Wireless Networks (WINET).
Chun-Han Lin and Chung-Ta King, “Sensor-Deployment Strategies for Indoor Robot Navigation,” in IEEE Transactions on Systems, Man and Cybernetics, Part A: Systems and Humans, vol. 40, pp. 388-398, 2010.
Nai.-Luen Lai, Chun-Han Lin, and Chung-Ta King, "Scheduling algorithms and routing structures for efficient convergecast in wireless sensor networks," in International Journal of Pervasive Computing and Communications, vol. 6, pp. 4-18, 2010.
CONFERENCE PAPERS
Nai-Luen Lai, Chung-Ta King, and Chun-Han Lin, “On Maximizing the Throughput of Convergecast in Wireless Sensor Networks,” in Proceedings of the 3rd international conference on Advances in grid and pervasive computing (GPC), pages 396-408, 2008.
Chun-Han Lin, Chung-Ta King, and Hung-Chang Hsiao, “Region Abstraction for Event Tracking in Wireless Sensor Networks,” in Proceedings of the 8th International Symposium on Parallel Architectures, Algorithms and Networks (ISPAN), pages 274-281, 2005.
PATENTS
Fu-Kuang Yeh, Long-Der Chen, Chung-Ta King, and Chun-Han Lin, "METHOD FOR INFORMATION TRANSMISSION WITH BACKBONE NETWORK AND A POSITION MONITORING SYSTEM FOR MULTIPLE ROBOTIC DEVICES," submitted to USA and ROC Patent Offices, pending.
SUBMITTED PAPERS
Chun-Han Lin, Huang-Chen Lee and Chung-Ta King, “Periphery Deployment for Wireless Sensor Systems with Guaranteed Coverage Percentage,” submitted to Journal of Systems and Software, 2nd revision.