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Topology Control for Reduced Interference in Ad hoc Networks

This paper discusses reducing interference in ad hoc networks through topology control, aiming to increase network lifetime and minimize interference using an interference model. The Average Path Interference algorithm (API) is introduced for computing a Gabriel graph. Related works such as the Low Interference Spanner Establisher (LISE) and XTC algorithm are reviewed. Simulation results are presented, along with a new topology control algorithm for creating energy-spanning graphs and new interference metrics for low interference graphs.

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Topology Control for Reduced Interference in Ad hoc Networks

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  1. Reducing Interference in Ad hoc Networks through Topology Control Tomas Johansson and Lenka CarrMotyckov´a EISLAB Lulea University of Technology SE971 87 Lulea, Sweden ACM Discrete Algorithms and Methods for Mobile Computing and Communications-Principles of Mobile Computing (DIALM-POMC’05) Speaker : Chang Chau-Chieh

  2. Outline • Introduction • Interference metrics • Average Path Interference algorithm (API) • Related works • Simulation • Conclusion

  3. Introduction • Topology Control • Increase the network lifetime • Minimize the interference • Using interference model • Evaluate the topology

  4. Introduction • G=(V,E) : Euclidian graph • V : network nodes • E : communication links

  5. Introduction • GTC= (V,ETC) : t-spanner graph • the shortest path in GTCbetween any two nodes is at most t times longer than the shortest path between these nodes in G

  6. Interference metrics – (1) • Interference model • the maximum coverage for any node

  7. Interference metrics – (2) • The metrics do not consider • the paths in the graph • the interference in general

  8. Interference metrics – (2) (3) • Interference-optimal path (IoptPuv) • Interference-optimal path with the shortest path (SPuv)

  9. Interference metrics – (4) • Maximum interference difference metric

  10. Average Path Interference algorithm (API) • Computing a Gabriel graph • Reducing the graph

  11. API- Step 1

  12. API- Step 2

  13. API

  14. Related works • Low Interference Spanner Establisher (LISE) • XTC algorithm

  15. LISE • GTC= (V,ETC) : t-spanner graph • the shortest path in GTCbetween any two nodes is at most t times longer than the shortest path between these nodes in G

  16. e2 LISE • Interference model Cov(e1) = 5 Cov(e2) = 1 e1 S

  17. LISE

  18. XTC • Nodes needs local knowledge. • Degree : 6 • GXTC does not contain any cycles of length 3

  19. XTC

  20. Simulation

  21. Simulation Results

  22. Simulation Results

  23. Simulation Results

  24. Simulation Results

  25. Conclusion • We also propose a new topology control algorithm • Produce an energy-spanning graph • Established a new interference metrics • Low interference graph

  26. Thank You.

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