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A Dedicated Multi-channel MAC Protocol Design for VANET with Adaptive Broadcasting

A Dedicated Multi-channel MAC Protocol Design for VANET with Adaptive Broadcasting. Ning Lu 1 , Yusheng Ji 2 , Fuqiang Liu 1 , and Xinhong Wang 1 1 Dept. of Electronics and Information Engineering, Tongji University, Shanghai, China 2 National Institute of Informatics, Tokyo, Japan

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A Dedicated Multi-channel MAC Protocol Design for VANET with Adaptive Broadcasting

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  1. A Dedicated Multi-channel MAC Protocol Design for VANET with Adaptive Broadcasting Ning Lu1, Yusheng Ji2, Fuqiang Liu1, and Xinhong Wang1 1Dept. of Electronics and Information Engineering, Tongji University, Shanghai, China 2National Institute of Informatics, Tokyo, Japan IEEE WCNC 2010

  2. Outline • Introduction • The DMMAC protocol • Performance evaluation • Conclusion

  3. Introduction • Many advanced wireless technologies are being applied to transport systems • Safe • Intelligent • Efficient • In particular, the Vehicular ad hoc network (VANET) • Vehicle to Vehicle (V2V) communication • Vehicle to infrastructure (V2I) communication

  4. Introduction • The MAC protocol for VANET is critical to provide efficient and reliable medium access, but • Fast topology change • High node mobility • Different Quality of Service(QoS) requirements

  5. Introduction_goals • Authors propose a dedicated multi-channel MAC protocol, called DMMAC, for VANET • Adaptability broadcasting provides collision-free and delay-bounded transmissions for safety messages • Higher communication throughput • Lower network latency

  6. The DMMAC protocol_Background • IEEE 1609.4 provide an important multi-channel MAC • CCH(control channel) interval • Safety messages and control packets • SCH(service channel) interval • Exchange data

  7. The DMMAC protocol • Frame architecture of DMMAC BCH(Basic Channel)

  8. The DMMAC protocol Sync Interval CCH Interval SCH Interval ABFLmin , ABFLmax CRP ABF ABFL (ABF Length) BCH Basic Channel TDMA CSMA/CA

  9. The DMMAC protocol CCH Interval CRP ABF

  10. The DMMAC protocol • BCH Reservation process • Computation of ABFL • Virtual Slot operation

  11. The DMMAC protocol • BCH Reservation process CCH Interval CRP ABF Each slot can only reused by one neighbor

  12. The DMMAC protocol • BCH Reservation process • FI (Frame Information) The slot occupation within One-hop and 2-hop Rule 2 : to reserve a BCH not used within two hop Free or Busy Rule 1: if a packet has been successfully received or transmitting

  13. The DMMAC protocol • BCH Reservation process

  14. The DMMAC protocol • BCH Reservation process Rule 3: to reserve empty slot

  15. The DMMAC protocol • Computation of ABFL CCH Interval CRP ABF ABFLi = max[ALk]+SFL AL(Active slot)

  16. The DMMAC protocol • Computation of ABFL Rule 4:ABFLi=ABFLmax

  17. The DMMAC protocol • Virtual Slot operation CCH Interval CRP ABF Contend toCRP-REQ or CRP-BRD

  18. The DMMAC protocol Rule 5 : if vehicle i want to send CRP. Wait for the ended of ABFs of one-hop • Virtual Slot operation Mute slot

  19. The DMMAC protocol • Virtual Slot operation Rule 6

  20. The DMMAC protocol Rule 7 : vehicle i can send the CRP-REQ to vehicle j(one-hop) • Virtual Slot operation

  21. Performance evaluation • Simulator ：NS-2 • Parameters

  22. Performance evaluation • Sparse scenario

  23. Performance evaluation • Dense scenario

  24. Performance evaluation • Results of BCH reservation in sparse scenario

  25. Performance evaluation • Results of BCH reservation in dense scenario

  26. Performance evaluation • Delivery ratio of safety packets

  27. Conclusion • This paper presented a dedicated multi-channel MAC(DMMAC) protocol for VANET • collision-free and delay-bounded transmission for safety applications

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