Experimental analysis of CCA threshold adjusting for vehicle EWM transmission in V-CPS. (2016)

• Record Type: Journal Article
• Authors: Han, Qingwen; Zeng, Lingqiu; Yang, Le; Liu, Yuebo
• Is Part Of: International journal of ad hoc and ubiquitous computing. Volume 21:Number 1(2016)
• Page Start: 1
• Page End: 10
• Publication Date: 2016
• Subjects: V-CPS -- vehicular cyber-physical systems -- information dissemination -- EWM transmission -- emergency warning messages -- regional flooding -- clear channel assessment -- CCA threshold adjustment -- vehicle safety -- transmission delay -- sensing time -- idle channels; Ubiquitous computing -- Periodicals; Embedded computer systems -- Periodicals; Electronic data processing -- Distributed processing -- Periodicals; Wireless communication systems -- Periodicals; Computer architecture -- Periodicals; 004.2
• Languages: English
• ISSNs: 1743-8225

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 (CCAth ) 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 CCAth setting can shorten the transmission delay with 12 ms, and guarantee a relative high successful dissemination rate about 60%.