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Enhancing Efficiency with Power Control in Wireless Ad Hoc Networks

This research explores power control MAC protocols in wireless ad hoc networks to improve space-time utilization and reduce interference. It discusses the impact of power control on routing, spatial utilization in various MACs, and presents experimental results supporting the findings. The study outlines the system model, RTS/CTS-based discussions, and optimal transmission floor areas for improved transport throughput. While power control offers benefits, it also increases system complexity and message overhead.

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Enhancing Efficiency with Power Control 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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