1. Wireless Access and Networking Technology Lab WANT Energy-efficient and Topology-aware Routing for Underwater Sensor Networks Xiaobing Wu, Guihai Chen and Jinming Chen State Key Laboratory for Novel Software Technology Department of Computer Science and Technology Nanjing University IEEE ICCCN,2010 (33.9% ) 1

2. Wireless Access and Networking Technology Lab WANT Introduction System model SEANAR Simulation Conclusion Outline 2

3. Wireless Access and Networking Technology Lab WANT Applications – Environmental – Monitoring – Resource investigation – Disaster prevention Introduction 3

4. Wireless Access and Networking Technology Lab WANT Underwater sensor networks  Sparsely deployed Void  Water currents Relative positions of nodes always change  3-dimensional spaces  Acoustic channels Low propagation speed High latency. Introduction 4

5. Wireless Access and Networking Technology Lab WANT Greedy Forwarding Introduction 5 S O A B C D Void

6. Wireless Access and Networking Technology Lab WANT VBF Introduction 6 S O A B C D

7. Wireless Access and Networking Technology Lab WANT VBF Introduction 7 S O A B C Void

8. Wireless Access and Networking Technology Lab WANT Sparse networks  Not energy efficient, and suffer from  Poor performance To evaluate the candidates is a critical issue  Void Motivation 8

9. Wireless Access and Networking Technology Lab WANT SEANAR  Energy-efficient and topology-aware routing protocol Improved packet delivery ratio. Decrease energy consumption Goal 9

10. Wireless Access and Networking Technology Lab WANT 3D area Randomly deployed with sparse density Sink is fixed at the surface Multihop routing Transmission range is fixed Node  Freely move in the horizonal 2D plane  Slightly move in the vertical direction  Own locations information  unique ID System model 10

11. Wireless Access and Networking Technology Lab WANT System model 11 S S S3S3 S2S2 S4S4 S5S5 S1S1

12. Wireless Access and Networking Technology Lab WANT SEANAR 12 S E A D B C F Inner neighbors (ex. B 、 C ) Aside neighbors (ex. D 、 E 、 F)

13. Wireless Access and Networking Technology Lab WANT SEANAR 13 S E A D B C F LocMsg packet Node ID(x,y,z)Energy

14. Wireless Access and Networking Technology Lab WANT SEANAR 14 S E A D B C F HelloMsg Node IDsequence number of data Layer infomation

15. Wireless Access and Networking Technology Lab WANT SEANAR 15 S E A D B C F AckMsg Node IDdistInner DegreeAside DegreeEnergy

16. Wireless Access and Networking Technology Lab WANT Neighbor is in the same layer Neighbor is in the inner layer SEANAR 16 mndidi djdj EjEj E init Inner DegreeAside DegreeRouter node to sink distance Candidate node to sink distance Residual energy Initial energy

17. Wireless Access and Networking Technology Lab WANT SEANAR 17 S E A D B C F

18. Wireless Access and Networking Technology Lab WANT Simulation 15 Parameters SimulatorC++ TopologyRandomly deployed Network size240 m * 240 m * 240 m Communication range30 m Broadcasting period25 s Initial clock30 s Sink(120 m, 120 m, 120 m )

19. Wireless Access and Networking Technology Lab WANT Simulation 15 Parameters Initial energy of each node1000J Sending energy cost Receiving energy cost Length of data packet100bit Length of HelloMsg10bit Length of AckMsg5bit Length of LocMsg5bit

20. Wireless Access and Networking Technology Lab WANT Simulation 16

21. Wireless Access and Networking Technology Lab WANT Simulation 17

22. Wireless Access and Networking Technology Lab WANT Simulation 17

23. Wireless Access and Networking Technology Lab WANT Simulation 17

24. Wireless Access and Networking Technology Lab WANT SEANAR  Energy-efficient and topology-aware routing protocol Lower energy consumption Packet delivery ratio 19 Conclusions

25. Wireless Access and Networking Technology Lab WANT 20