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CHEN Ting, ZHAO Xiang-mo, DAI Liang, ZHANG Li-cheng. Adaptive transmission mode selection strategy of vehicle communication access system[J]. Journal of Traffic and Transportation Engineering, 2014, 14(1): 119-126.
Citation: CHEN Ting, ZHAO Xiang-mo, DAI Liang, ZHANG Li-cheng. Adaptive transmission mode selection strategy of vehicle communication access system[J]. Journal of Traffic and Transportation Engineering, 2014, 14(1): 119-126.
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Adaptive transmission mode selection strategy of vehicle communication access system

  • 1.

    School of Information Engineering, Chang'an University, Xi'an 710064, Shaanxi, China

  • 2.

    School of Electronic and Control Engineering, Chang'an University, Xi'an 710064, Shaanxi, China

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  • Author Bio:

    CHEN Ting(1982-), female, lecturer, PhD, +86-29-62630049, tchenchd82@126.com

  • Received Date: 2013-08-18
  • Publish Date: 2014-02-25
    Abstract
  • In order to improve the capability of intelligent transportation system (ITS) for effective transmitting of all kinds of information service flows, the technologies of adaptive modulation and coding (AMC) and orthogonal frequency division multiple access (OFDMA) were introduced into the vehicle communication access subsystem, and an adaptive transmission mode selection strategy was proposed. When the vehicle ran in a special geographic region or at a driving speed below 60km·h-1, the process of adaptive transmission mode selection would be triggered by the vehicle communication access system. Compared to the fixed SNR switching thresholds of AMC transmission modes of the typical strategies, the switching thresholds of the proposed strategy were variable and determined by the target packet error rate of ITS information service flow. In this case, different modulation and coding mode levels were probably used for the same access channel condition with different kinds of information service flows transmitting toobtain higher effective data transmission rate. All kinds of service flow target packet error rates and system average effective data transmission rates of the selection strategy were evaluated by using mathematical analysis. Analysis result indicates that the proposed strategy can make better tradeoff between transmission reliability and efficiency. When the target packet error rates of the first, second and third kind of ITS information service flow are 10-6, 10-5 and 10-2 respectively, the proposed strategy is recommended to improve the system average data transmission rate of the typical strategy by 8% with fulfilling the transmission reliability requirements at the same time.

     

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