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Advantages of Dual Channel MAC for Wireless Sensor Networks

Advantages of Dual Channel MAC for Wireless Sensor Networks. Antonio G. Ruzzelli, Gregory O’Hare, Raja Jurdak † and Richard Tynan School of Informatics and Computer Science University College Dublin Dublin, Ireland {ruzzelli,richard.tynan,gregory.ohare}@ucd.ie

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Advantages of Dual Channel MAC for Wireless Sensor Networks

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  1. Advantages of Dual Channel MAC for Wireless Sensor Networks Antonio G. Ruzzelli, Gregory O’Hare, Raja Jurdak† and Richard Tynan School of Informatics and Computer Science University College Dublin Dublin, Ireland {ruzzelli,richard.tynan,gregory.ohare}@ucd.ie †Bren School of Information and Computer Sciences University of California Irvine CA 92697 rjurdak@ics.uci.edu

  2. Summary

  3. Background • Traditional low cost radios for wireless sensors operate with one frequency channel at any given time • A profusion of MAC protocols focus on energy efficiency over one frequency channels

  4. Unique frequency channel issues • MACs like IEEE802.11, SMAC, TRAMA or BMAC suffer from: • High latency (e.g. due to RTS/CTS/ACK in CSMA/CA) • Low flexibility (Difficult to release slots unused in TDMA) • Inefficient usage of the wireless channel (e.g. the ETP problem in CSMA/CA)

  5. Advances in WSNs • Novel transceivers can operate with two channels simultaneously with a relative small increase of energy consumption e.g. nRF2401 • nRF2401 is effectively mounted on the motes developed in Cork

  6. DCMA/AP: Dual channel multiple access with adaptive preamble • Channel Cd used for data • Channel Cc used for notifications

  7. DCMA transmission mechanism (1)

  8. DCMA mechanism (2)

  9. The exposed terminal problem removal

  10. Adaptive Preamble mechanism

  11. Opportunistic Crossover mechanism Next RX RX TX Channel Cc Channel Cd • During ongoing transmission, the next scheduled RX node is notified through the alternative channel Cc.

  12. Related work

  13. Timing Analysis against BMAC

  14. Implementation

  15. Preliminary results

  16. Future works

  17. Conclusion

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