Title: Experimental analysis of CCA threshold adjusting for vehicle EWM transmission in V-CPS

Authors: Qingwen Han; Lingqiu Zeng; Le Yang; Yuebo Liu

Addresses: College of Communication Engineering, Chongqing University, Chongqing 400030, China; Key Laboratory of Dependable Service Computing in Cyber Physical Society, Ministry of Education, Chongqing, China ' College of Computer Science, Chongqing University, Chongqing 400030, China; Key Lab of Chongqing for Software Theory and Technology, Chongqing, China ' College of Communication Engineering, Chongqing University, Chongqing 400030, China ' College of Communication Engineering, Chongqing University, Chongqing 400030, China

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%.

Keywords: 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.

DOI: 10.1504/IJAHUC.2016.074385

International Journal of Ad Hoc and Ubiquitous Computing, 2016 Vol.21 No.1, pp.1 - 10

Received: 04 Jun 2013
Accepted: 14 Feb 2014
Published online: 27 Jan 2016 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article

 

Return to top