Dissertation defence

1. Deployment Techniques in
Wireless Sensor Networks with
Guaranteed Coverage and
Lifetime
Student: Chun-Han Lin
Advisor: Prof. Chung-Ta King

2. Wireless Sensor Network (WSN) Crossbow Mica2
Sense: light, motion, temperature, magnetic fields, gravity, humidity,
vibration, pressure, electrical fields, sound, ...
2 2011/8/11

3. Project Testbed
http://www.csail.mit.edu/
http://fiji.eecs.harvard.edu
/Volcano
Harvard moteLab
COMMON Sense project
http://www2.ece.ohio-state.edu/~ekici/
http://db.csail.mit.edu/
3 2011/8/11

4. Importance of Deployment Technique
 Coverage
 Detection ratio
 Connectivity
 Fault tolerance
 …
 Lifetime
 Energy
 Maintenance
 Deployment cost
4 2011/8/11

5. Design of Deployment Technique
 Various WSN systems
 Different requirements
 Developing 3 techniques
 Indoor robot navigation
 Debris-flow observation
 Environment surveillance
5 2011/8/11

6. Indoor Robot Navigation
 Space navigation
 Security
 Housekeeping
 Delivery
 Medical
 …
 Localization
 Positioning sensor http://www.worldrobotics.org/
 A set of sensors can provide
localization service
 Wireless
 Infrastructure
 Coverage
6 2011/8/11

7. Challenge
Positioning sensor
 Traditional deployment
 Full coverage
 Tradeoff
 Cost  Coverage
 How
 Reducing sensor
 Where
 Keeping coverage
 Acceptable error
7 2011/8/11

8. Error Model
 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
8 2011/8/11

9. Minimum Deployment-set Problem
 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 Refinement
Divide and conquer
9 2011/8/11

10. Performance Evaluation
 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.
10 2011/8/11

11. 農委會水土保持局
Debris-Flow Observation
 Water course
 Debris flow
 Sensor
 Collecting information
 Water bank
 Challenge
 How to collect information
from outside
 Where
 Coverage
11 2011/8/11

12. Deployment Problem
 Track
 Activity region
 No deployment
 Information
 Uniform distribution
 Coverage
 Point coverage
 Area coverage
12 2011/8/11

13. Periphery Deployment Problem
 Periphery Deployment
Problem (A, T, R, CPmin)
 Solvable?
 Maximal coverage
 Ideal deployment
 Upper bound
 Practical deployment
 Expected value
13 2011/8/11

14. Deployment Procedure
Ideal deployment
Initial deployment
14 2011/8/11

15. Performance Evaluation
 Size of deployment set  Coverage
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, 2 nd revision.
15 2011/8/11

16. Environment Surveillance
 Fixed locations
 Sense
 Collection
 Record
 Analysis
 How to prolong lifetime?
 Equipping more energy
16 2011/8/11

17. Energy Allocation
 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
17 2011/8/11

18. Constrained Multiple Deployment Problem
 Constrained Multiple
Deployment Problem (G,
, B, T)
 Sense
 Collection
 Optimal solution
 Conservation of flow
 Energy consumption
 Optimal goal
 Cost Bound
18 2011/8/11

19. Deployment Procedure
19 2011/8/11

20. Performance Evaluation
 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).
20 2011/8/11

21. Conclusion
 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
21 2011/8/11

22. Publications
 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, 2 nd revision.
22 2011/8/11