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CMMP : Clustering-Based Multi-Channel MAC Protocol In VANET

CMMP : Clustering-Based Multi-Channel MAC Protocol In VANET. 指導教授：許子衡 教授 報告學生：馬敏修. Outline. 1.Introduction 2.Multi-Channel MAC Protocol 3.CMMP(Clustering-Based Multi-Channel MAC Protocol ) 4.Evaluation and Analysis 5.Conclusions. Introduction(1/3).

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CMMP : Clustering-Based Multi-Channel MAC Protocol In VANET

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  1. CMMP : Clustering-Based Multi-ChannelMAC Protocol In VANET 指導教授：許子衡 教授 報告學生：馬敏修

  2. Outline 1.Introduction 2.Multi-Channel MAC Protocol 3.CMMP(Clustering-Based Multi-Channel MAC Protocol ) 4.Evaluation and Analysis 5.Conclusions

  3. Introduction(1/3) • IEEE 802.11p WAVE(Wireless Access in the Vehicular Environment) defines amendments to IEEE 802.11 • To improve V2V communication efficiency have studied MAC (Medium Access Control) and network algorithm based on MANET (Mobile Ad-hoc Network) and VANET (Vehicle Ad-hoc Network).

  4. Introduction(2/3) • The VANET contains the location of every node on the road from GPS (Global Positioning System). • VANET has more frequent path loss, a shorter link life-time, and lower packet throughput • Wireless LAN that is using CSMA/CA in the vehicular environment procedure accompany by frequent collisions

  5. Introduction(3/3) • Multi-channel MAC protocol based on cluster head for contention free considering a feature of VANET • Cluster head manages the channel status table of cluster and periodically broadcasts CUL (Channel Usage List) in control channel. • Each station transmits RCA (Request Channel Assignment) to cluster head to get an allocation of data channel in control channel.

  6. Multi-Channel MAC Protocol(1/4) • For the single-channel, the biggest data size which can be handled will be restrained by the channel wide. • Much lower normalized propagation delay will be caused in multichannel than in the single-channel. • When the multichannel is used, the QoS (Quality of Service) can be achieved much easily than single-channel

  7. Multi-Channel MAC Protocol(2/4) • In the simple multichannel media access control protocol, all the other nodes which use different channels will be caused the deafness phenomenon as the failure of the RTS/CTS (Request To Send / Clear to Send) transmission.

  8. Multi-Channel MAC Protocol(3/4) • In DCA(Dynamic Channel Assignment), one control channel and N data channels are assigned, each node should check whether the data channel is available for the data transmission • In order to check the available of the data channel, each node should maintain two kinds of tables such as CUL(Current Usage List) and FCL(Free Channel List).

  9. Multi-Channel MAC Protocol(4/4)

  10. CMMP(1/6) • Single channel media access control protocol has the weak points of the restrain of the biggest data handle quantity, a lack of the QoS • Because of the frequently transmit packet of the DCA’s RTS/CTS, and the overhead caused by the data update, the network efficiency be reduced. • The same as the DCA, CMMP also uses the control channel and data channel separately.

  11. CMMP(2/6) • Control channel be operated the TDMA based on contention method as follows • A cluster member node transmits the RCA (RequestChannel Assignment) packet to the cluster header in order tocompete with other nodes to use the channel • The cluster member node will check the CUL which is broadcasted by the cluster header periodically to check the available channel

  12. CMMP(3/6)

  13. CMMP(4/6) • If the data wants to be transmitted, theRCA packet will betransmitted to the cluster header • If the RCA isreceived from its cluster headersuccessfully, cluster headerwill update its CUL and transmit it to the cluster memberperiodically. • If there is no data wants to be transmitted orreceive the RCA failed, it will wait when it receives theCUL each time.

  14. CMMP(5/6)

  15. CMMP(6/6)

  16. Evaluation and Analysis(1/4) • Used the QualNet version 3.9 • Use the basic highway model in the vehicle environment • In order to check the performance of the media access control in the continuously data transmit stations, CBR (Constant Bit Rate) is used • Support the multi-channel, the frequency has been divided into 6 channels • The basic layer setting, it is followed the IEEE 802.11p

  17. Evaluation and Analysis(2/4)

  18. Evaluation and Analysis(3/4)

  19. Evaluation and Analysis(4/4)

  20. Conclusions • Improving network performance in a vehicle environment with multi-channel media access control of the cluster-based algorithm was proposed • According to the allocated channel numbers, loss of channel and contention or collision node, we confirmed that MAC transmission delay has decreased more than 60% and it also has increased more than 30% for total transmission ratio

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