Experimental analysis of CCA threshold adjusting for vehicle EWM transmission in V-CPS
by Qingwen Han; Lingqiu Zeng; Le Yang; Yuebo Liu
International Journal of Ad Hoc and Ubiquitous Computing (IJAHUC), Vol. 21, No. 1, 2016

Abstract: Vehicular cyber-physical system (V-CPS) offers the potential to significantly improve the safety, comfort and entertainment to motorists. The topic of emergency warning messages (EWMs) transmission is still most import for V-CPS because of the thousands of lives taken by traffic accident. The EWM dissemination is expected to inform the related vehicles in time. This paper proposed a new EWM dissemination mechanism based on the clear channel assessment (CCA_th) threshold adjusting method to reduce the transmission delay by shorten the sensing time for idle channel. Experimental results obtained from the testbed - EyeNet - showed that the proposed mechanism employing an appropriate CCA_th setting can shorten the transmission delay with 12 ms, and guarantee a relative high successful dissemination rate about 60%.

Online publication date: Wed, 27-Jan-2016

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