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  • 1. Deployment Techniques inWireless 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 deployment14 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 Procedure19 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