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Fault tolerance in wireless sensor networks by Constrained Delaunay Triangulation Coverage Strategy


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Fault tolerance in wireless sensor networks by Constrained Delaunay Triangulation Coverage Strategy

  1. 1. A Presentation on Fault Tolerance in Wireless Sensor Networks by Constrained Delaunay Triangulation Coverage StrategyUnder Guidance of: Presented by :-Prof. Dr. Santosh Kumar Swain Ramnesh DubeyDept. of Computer science & Engg. Branch: M. Tech.(CSE)KIIT University Roll no: 1050013 1
  2. 2. Outline1. Introduction2. Literature Survey3. Motivation4. Problem Definition5. Objective6. Proposed Work7. Simulation Result8. Comparison9. Conclusion10. Future Work11. References 2
  3. 3. Introduction Development of sensor nodes,Advances in with sensing, data processing,wireless and communicatingCommunications components: low cost low dimension low power consumption Sensing Computing low memory Communication low computational powerA wireless sensor network is composed by a large number of sensorsensing self-powered nodes. 3
  4. 4. Introduction (Contd.) Energy Efficiency Deployed Sensor Coverage networkFault tolerant: The system should be robust against node failure. 4
  5. 5. Literature Survey • Coverage in WSNs: Coverage Fault Deployment Energy Event Type Radii Tolerance Strategies Efficiency Transfer Target Area Fixed VariableCoverage coverage 5
  6. 6. Literature Survey (Contd.) 6
  7. 7. Literature Survey (Contd.) Coverage Strategies Coverage Strategies ComputationalForce Based Grid Based Geometry Based Triangular Lattice Voronoi Diagram Square Grid Delaunay Triangulation Hexagonal Grid Constrained Delaunay Triangulation 7
  8. 8. Motivation• Coverage strategies proposed so far do not facilitate fault tolerance and energy efficiency together.• Sensor networks are energy constrained as they are battery operated, but in addition to provide fault tolerant coverage, the energy efficiency of the network must be maintained.• K - coverage mechanisms proposed in the literature are not energy efficient as several sensors report simultaneously, leading to excessive energy consumption, congestion, and collisions in the network.• This reduces the quality of service and network performance. 8
  9. 9. Problem DefinitionTo incorporate in Coverage strategy• Event Reporting.• Energy Efficiency. 9
  10. 10. ObjectiveMy objective is to enhances a fault tolerantcoverage protocol that incorporate.• Event reporting with the help of additional support structure and• Energy efficiency by reducing the communication. 10
  11. 11. Proposed Work Deployment Coverage Backup Coverage Distributed Greedy Algo.Constrained Delaunay Triangulation Algo. And Selection of Backup node 11
  12. 12. Proposed Work (Contd.) 12
  13. 13. Proposed Work (Contd.) 13
  14. 14. Proposed Work (Contd.) Distributed Greedy Algo.• Procedure 2-COVERAGE (S [ ])• S [ ] is the set of sensor nodes deployed• R is the region to be covered• snode ← S[x] : x is randomly selected node• while (R is not Covered) do• dbl[i]← snode• snode← broadcast()• snode ←recv()• snode ←maxBenifit()• i ←i+1• end while• end procedure 14
  15. 15. Proposed Work (Contd.) Algorithm for Constrained Delaunay triangulation CDT1.Construct DT, set color of each node to WHITE, and broadcast all its 1-hop neighbor information using the packet Neighbor_Packet.2.Nodes having lowest id among its 2-hop neighbors set their color to BLACK.3. Each BLACK node chooses a set N of nodes from its 1-hop neighbors using the following method. (a) N = empty (b) n1 = farthest neighbor (c) N = N ᴜ n1 (d) for i = 2, 3,. . . 15
  16. 16. Proposed Work (Contd.) Algorithm for Constrained Delaunay triangulation CDT { ni = choose ith farthest neighbour if ni makes more than 60 degree angle with n1 , n2 , . . . , ni - 1 then N = N ᴜ ni }4. Each BLACK node add the constraint edges to the nodes in N and broadcasts these constraint edges information using the message Constraint _Packet.5. Each WHITE node sets its color = BROWN if it is other end of any constrained edges received using Constraint _Packet.6. Each BROWN node broadcasts its constraint edge information using the control packet Constraint _Packet.7. All WHITE and BROWN nodes remove edges connected to it which crosses constraint edged, this information is broadcasted using Edge cross _Packet.8. Each-BLACK node places a new edge from the WHITE nodes, from which the edge was deleted in the previous step to from new triangles. 16
  17. 17. Proposed Work (Contd.) Selection of Backup Nodes Algo.• Procedure: BK SELECT (dbl [ ])•• dbl [ ] is the set of sensor nodes providing 2Coverage•• Neighbors [ ] is the set of Triangle Neighbors of each node•• i ←0• while i ≠ dbl.end() do•• if dbl[i].area() ≡ Neighbors [ ].area() then• backup[ j] ← dbl[i]• PotPri[] ←nearest(Neighbors[],backup[ j])• PotPri[] ←median(Neighbors[],backup[ j])• i ← i+1• end if• end while• while i ≠ PotPri.end() do• if PotPri.area() ≡ Neighbors [ ].area() then• backup[] ←PotPri[i]• erase(PotPri[i])• end if• end while• end procedure 17
  18. 18. Proposed Work (Contd.)• Selection of Backup Nodes: 18
  19. 19. Proposed Work (Contd.)• Backup Node Functionality: Event Detection Backup Reporting 19
  20. 20. Proposed Work (Contd.)• Event Reportinga. Several nodes detecting and reporting events to common forwarder.b. A node and its forwarder detecting the event.c. Channel access issues. 20
  21. 21. Proposed Work (Contd.)• Event Reporting Handle the all three challenges 21
  22. 22. Simulation Result Simulation Environment Parameter Low Power Value High Power ValueNumber of nodes 50 50Area Range (m*m) 1000 1000Transmission range (m) 195 195Data Packet size 512 512Bandwidth (Kbps) 2.4 100Transmit power (mW) 14.88 660Receive power (mW) 12.50 395Idle power (mW) 12.36 350sleep power (mW) 1.4 300 22
  23. 23. Simulation Result (Contd.)• Throughput Low Power 23
  24. 24. Simulation Result (Contd.)• Throughput High Power 24
  25. 25. Simulation Result (Contd.)• Packet Drop Rate Low Power 25
  26. 26. Simulation Result (Contd.)• Packet Drop Rate High Power 26
  27. 27. Simulation Result (Contd.)• Average Packets End to End Delay Low Power 27
  28. 28. Simulation Result Cont.• Average Packets End to End Delay High Power 28
  29. 29. Simulation Result (Contd.)Fault Node / Active Node 29
  30. 30. Simulation Result (Contd.)Fault Node / Active Node 30
  31. 31. Simulation Result (Contd.)Energy (Low Power/ High Power) 31
  32. 32. ComparisonDelaunay Triangulation Vs. Constrained Delaunay Triangulation 32
  33. 33. Comparison (Contd.)Delaunay Triangulation Vs. Constrained Delaunay TriangulationS.No. Features Delaunay Constrained Delaunay Triangulation Coverage Triangulation strategy Coverage strategy1 Simulation Scenario Matlab Matlab2 Numbers of 50 50 Nodes3 Area 1000 10004 Dimensions 2D 2D5 Distance Computed Formula6 Sensors Communicate Distance Sensing Distance Sensing Condition Range Range 33
  34. 34. Comparison Cont.S.No. Features Delaunay Triangulation Constrained Delaunay Coverage Triangulation strategy Coverage strategy7 Coverage Optimization Coverage Area Coverage8 Sensing Range Irregular Sensing Range Regular Sensing Range9 Strategy Geometry Based Geometry Based 34
  35. 35. Comparison (Contd.)Delaunay Triangulation Other Related Work 35
  36. 36. Comparison Cont.Constrained Delaunay Triangulation 36
  37. 37. Comparison (Contd.)Constrained Delaunay Triangulation 37
  38. 38. ConclusionTo provide quality service by coverage strategy,there arises a need for developing protocols toprovide.• Fault tolerance.• Event reporting and• Maintain energy efficiency. 38
  39. 39. Future Work• Better mechanisms in choosing the minimal number of nodes for our Coverage Strategy.• Lowering the contention in the Network.• Low latency. 39
  40. 40. Dissertation R.Dubey, S.K.Swain, C.P.Kashayp, R.Bera “Fault Tolerance in Wireless Sensor Networks Using Constrained Delaunay Triangulation”, International Conference on Electrical Engineering and Computer Science (ICEECS), IRNet, April 2012.• R.Dubey, S.K.Swain, N.S.Mandal, C.M.Mourya, “Constrained Delaunay Triangulation for Wireless Sensor Networks", Elsevier Ad Hoc Networks,2012.( Communicated) 40
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  48. 48. THANK YOU 48