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Distributed topology construction of Bluetooth personal area networks

Distributed topology construction of Bluetooth personal area networks. Salonidis, T.; Bhagwat P.; Tassiulas, L.; LaMaire, R.; Department of Electrical & Computer Engineering University of Maryland at College Park INFOCOM 2001 Speaker: Ruo Wey-Yu. Preface. Introduction

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Distributed topology construction of Bluetooth personal area networks

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  1. Distributed topology construction of Bluetooth personal area networks Salonidis, T.; Bhagwat P.; Tassiulas, L.; LaMaire, R.;Department of Electrical & Computer Engineering University of Maryland at College Park INFOCOM 2001 Speaker: Ruo Wey-Yu

  2. Preface • Introduction • Bluetooth Topology Construction Protocol (BTCP) • Evaluation • Conclusion

  3. Introduction • Link Establishment in Bluetooth • Bluetooth’s asymmetric link formation protocol • Symmetric protocol for link formation (we propose)

  4. Bluetooth’s asymmetric link formation protocol • Provide short connection establishment delay • Sender and receiver’s role are predesigned

  5. Symmetric protocol for link formation (we propose) • Connection will not have explicit a sender and a receiver • Point-to-point connection • Provide longer connection establishment delay • Nodes will change between inquiry and inquiry page state until the connection success

  6. Link Formation Delay • Random backoff delay (RB delay) • The receiver wakes up and start listening again at the hop it was listening before RB • Frequency synchronization delay (FS delay) • The time before the sender transmits at the frequency the receiver is now listening on • Link Formation delay R • R=2FS+RB

  7. Link formation delay Tc

  8. Mean and variance of Tc Tc: Link Formation Delay

  9. Threshold ALT_TIMEOUT • ALT_TIMEOUT is set when a node power on, and reset each time it wins • If ALT_TIMEOUT expires the node assume it’s coordinator ,entering page scan stage • ALT_TIMEOUT=

  10. Bluetooth Topology Construction Protocol (BTCP) • Suppose all the nodes in network can hear to any other nodes • The resulting network is full-connected • 2 piconets share only one bridge, and bridge connects to only 2 piconets • Algorithm • Phase I : Coordinator Election • Phase II : Role Determination

  11. Bluetooth Topology Construction Protocol --Phase I 1 Vote=0 Vote=0 2 Vote=0 3 Vote=0 4 Vote=0 8 7 Vote=0 5 Vote=0 Vote=0 6 Vote=0 16 17 Vote=0 Vote=0 14 Vote=0 13 10 Vote=0 11 15 Vote=0 Vote=0 12 Vote=0

  12. Bluetooth Topology Construction Protocol --Phase I 1 2 Vote=1 3 8 4 7 Vote=1 5 Vote=1 6 16 17 Vote=1 Vote=1 14 Vote=1 13 10 Vote=1 11 15 Vote=1 12

  13. Bluetooth Topology Construction Protocol --Phase I 1 2 Vote=1 FHS Packet 3 FHS Packet FHS Packet 8 4 7 Vote=1 5 Vote=1 6 FHS Packet 16 17 Vote=1 Vote=1 FHS Packet 14 Vote=1 13 10 Vote=1 FHS Packet FHS Packet 11 FHS Packet 15 Vote=1 12

  14. Bluetooth Topology Construction Protocol --Phase I 2 Page scan Vote=1 Page scan 8 4 Vote=1 Vote=1 Page scan Page scan 6 Vote=1 17 Page scan Vote=1 14 Vote=1 13 Vote=1 Page scan 11 Vote=1 Page scan Page scan

  15. Bluetooth Topology Construction Protocol --Phase I 2 Page scan Vote=1 Page scan 8 4 Vote=1 Page scan Vote=1 Page scan 6 Vote=1 17 Vote=1 Page scan 14 Vote=1 13 Vote=1 Page scan 11 Vote=1 Page scan Page scan

  16. Bluetooth Topology Construction Protocol --Phase I 2 FHS Packet Vote=1 8 4 Vote=1 FHS Packet Vote=1 6 Vote=1 17 Vote=1 14 Vote=1 13 FHS Packet FHS Packet Vote=1 11 Vote=1 : Node in page scan state

  17. Bluetooth Topology Construction Protocol --Phase I 8 Vote=2 6 Vote=2 17 Vote=2 14 Vote=2 : Node in page scan state

  18. Bluetooth Topology Construction Protocol --Phase I 8 Vote=2 6 Vote=2 17 Vote=2 14 Vote=2 : Node in page scan state

  19. Bluetooth Topology Construction Protocol --Phase I 8 Vote=2 FHS Packet 6 Vote=2 17 FHS Packet Vote=2 14 Vote=2 : Node in page scan state

  20. Bluetooth Topology Construction Protocol --Phase I 17 Vote=3 14 Vote=3 : Node in page scan state

  21. Bluetooth Topology Construction Protocol --Phase I 17 Vote=3 14 Vote=3 FHS Packet : Node in page scan state

  22. Bluetooth Topology Construction Protocol --Phase I 17 Vote=3 14 Vote=3 : Node in page scan state

  23. Bluetooth Topology Construction Protocol --Phase I 17 Vote=4 : Node in page scan state

  24. Bluetooth Topology Construction Protocol --Phase I Coordinator

  25. Bluetooth Topology Construction Protocol --Phase II

  26. Bluetooth Topology Construction Protocol --Phase II Master Master

  27. Bluetooth Topology Construction Protocol --Phase II Choose masters Master Master

  28. Bluetooth Topology Construction Protocol --Phase II FHS Packet FHS Packet

  29. Bluetooth Topology Construction Protocol --Phase II

  30. Bluetooth Topology Construction Protocol --Phase II

  31. Bluetooth Topology Construction Protocol --Phase II : Slaves : Masters

  32. Performance • Actual connection Time : , where is the mean network establishment delay.

  33. Performance

  34. Performance

  35. Performance

  36. Conclusion • The BTCP is practical and easy to implement • In actual distributed network, nodes will not always in transmission range. • A simple way is offered : coordinator will instruct its slave to be master to form another piconet. Finally, a Tree-shaped network will be formed.

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