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    National Tsing Hua University Institutional Repository > 歷任校長 > 陳文村 (2006-2010)  > 會議論文 >  An IEEE 802.11p based Distributed Channel Assignment Scheme Considering Emergency Message Dissemination


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/81587


    Title: An IEEE 802.11p based Distributed Channel Assignment Scheme Considering Emergency Message Dissemination
    Authors: I-Chiao Chu;Po-Yu Chen;W. T. Chen
    教師: 陳文村
    Date: 2012
    Publisher: Institute of Electrical and Electronics Engineers
    Relation: Proceedings of IEEE 75th Vehicular Technology Conference (VTC 2012-Spring), Institute of Electrical and Electronics Engineers, Yokohama, Japan, 6-9 May 2012
    Keywords: access protocols
    channel allocation
    transport protocols
    vehicular ad hoc networks
    Abstract: Vehicular Ad-hoc Networks (VANETs) has been regarded as an emerging and promising network for transportation because it can provide safety and useful traffic information for passengers. VANET employs IEEE 802.11p standard as transmission protocol that defines media access control (MAC) and physical layers, where provide one control channel and six service channels. IEEE 802.11p MAC protocol is a contention-based protocol that has low channel utilization under heavy traffic load. In this paper, we propose a Distributed Channel Assignment Scheme (DCAS) to increase the successful rate of channel reservation and avoid hidden terminal problem to increase the channel utilization. Besides, we also propose an emergency state transition mechanism when VANETs need to transmit emergency messages. Through state transition, vehicles in normal state using non-safety applications will enter emergency state to rapidly forward emergency message to reduce transmission delay. Simulation results show that the proposed scheme can improve 27% channel utilization in average comparing with random channel selection scheme.
    Relation Link: http://www.ieee.org/index.html
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/81587
    Appears in Collections:[陳文村 (2006-2010) ] 會議論文
    [資訊工程學系] 會議論文

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