Vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communication in a heterogeneous wireless network ¬タモ Performance evaluation ¬リニ

Connected Vehicle Technology (CVT) requires wireless data transmission between vehicles (V2V), and vehicle-to-infrastructure (V2I). Evaluating the performance of different network options for V2V and V2I communication that ensure optimal utilization of resources is a prerequisite when designing and developing robust wireless networks for CVT applications. Though dedicated short range communication (DSRC) has been considered as the primary communication option for CVT safety applications, the use of other wireless technologies (e.g., Wi-Fi, LTE, WiMAX) allow longer range communications and throughput requirements that could not be supported by DSRC alone. Further, the use of other wireless technology potentially reduces the need for costly DSRC infrastructure. In this research, the authors evaluated the performance of Het-Net consisting of Wi-Fi, DSRC and LTE technologies for V2V and V2I communications. An application layer handoff method was developed to enable Het-Net communication for two CVT applications: traffic data collection, and forward collision warning. The handoff method ensures the optimal utilization of available communication options (i.e., eliminate the need of using multiple communication options at the same time) and corresponding backhaul communication infrastructure depending on the connected vehicle application requirements. Field studies conducted in this research demonstrated that the use of Het-Net broadened the range and coverage of V2V and V2I communications. The use of the application layer handoff technique to maintain seamless connectivity for CVT applications was also successfully demonstrated and can be adopted in future Het-Net supported connected vehicle applications. A long handoff time was observed when the application switches from LTE to Wi-Fi. The delay is largely due to the time required to activate the 802.11 link and the time required for the vehicle to associate with the RSU (i.e., access point). Modifying the application to implement a soft http://dx.doi.org/10.1016/j.trc.2016.03.008 0968-090X/Published by Elsevier Ltd. q This article belongs to the Virtual Special Issue on CA Vehicles. ⇑ Corresponding author. Tel.: +1 (313) 523 0865; fax: +1 (864) 656 2670. E-mail addresses: [email protected] (K.C. Dey), [email protected] (A. Rayamajhi), [email protected] (M. Chowdhury), [email protected] (P. Bhavsar), [email protected] (J. Martin). 1 Tel.: +1 (864) 633 8659; fax: +1 (864) 656 0145. 2 Tel.: +1 (864) 656 3313; fax: +1 (864) 656 2670. 3 Tel.: +1 (856) 256 5399; fax: +1 (856) 256 5242. 4 Tel.: +1 (864) 656 4529; fax: +1 (864) 656 0145. Transportation Research Part C 68 (2016) 168–184