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Power Control For Distributed MAC Protocols in Wireless Ad Hoc Networks

Power Control For Distributed MAC Protocols in Wireless Ad Hoc Networks. Wei Wang, Vikram Srinivasan, Kee-Chaing Chua Department of Electrical and Computer Engineering National University of Singapore. IEEE TMC, Vol. 7, No. 10, October 2008. Outline. Introduction

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Power Control For Distributed MAC Protocols in Wireless Ad Hoc Networks

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  1. Power Control For Distributed MAC Protocols in Wireless Ad Hoc Networks Wei Wang, Vikram Srinivasan, Kee-Chaing Chua Department of Electrical and Computer Engineering National University of Singapore IEEE TMC, Vol. 7, No. 10, October 2008

  2. Outline • Introduction • RTS/CTS-based system model and discussion • Spatial utilization in other distributed MACs • Experimental results • Conclusions

  3. Introduction • Power control MAC protocols in wireless ad hoc networks • Increasing the efficiency of space-time utilization • Reducing the transmission power • Causing the less interference to nearby receivers Hidden terminal problem  4 way handshake Exposed terminal problem  power control

  4. System model • The received power • SINR (β)

  5. RTS/CTS-based discussion • Max tolerated interference i dij j k

  6. Avoid the collision problem • Power level of CTS

  7. The minimum transmission floor RTS i j CTS dij Min TR floor reserved = the union of the area (RTS/CTS) Optimal power control scheme

  8. Impact of the optimal TR on transport throughput • The maximal No. of simultaneous transmission pairs • The maximal transport throughput =

  9. Discussion of power control in routing • Fixed link length • Transport throughput can at most be improved by a constant factor • Heterogeneous link length • Short link • Tolerate the more interference • Increase the simultaneous transmssion

  10. Spatial utilization in other distributed MACs • The power control model work on other MAC protocols • Rate-adaptive MAC • Lower rate, lower interference • Physical carrier sensing • Larger effective range than TR • Busy tone • Higher spatial utilization

  11. Experimental Setting • NS 2.28

  12. Comparison • Power control schemes • NTPC, TPC-O, TPC-L1, TPC-L2, TPC-E • Scenario • String topology • Random topology • 500 m *500 m and 200 nodes

  13. Experiment results

  14. Experiment results • Random Networks

  15. Experiment results • Random Networks for different routing with fixed link length

  16. Experiment results • Random Networks for different routing with heterogeneous link length • 40 - 400 nodes

  17. Conclusions • In distributed MAC systems • Optimal transmission floor area • Improve the transport throughput • The system complexity and massage overhead are higher

  18. Thank you.

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