A Comparative Study of Data Dissemination Models for VANETs
2006 Third Annual International Conference on Mobile and Ubiquitous Systems: Networking & Services
VANETs (vehicular ad hoc networks) are emerging as a new network environment for intelligent transportation systems. Many of the applications built for VANETs will depend on the data push communication model, where information is disseminated to a group of vehicles. In this paper, we present a formal model of data dissemination in VANETs and study how VANET characteristics, specifically the bidirectional mobility on well defined paths, affects the performance of data dissemination. We study the
... data push model in the context of TrafficView, a system we have implemented to disseminate information about the vehicles on the road. Traffic data could be disseminated using vehicles moving on the same direction, vehicles moving in the opposite direction, or vehicles moving in both directions. Our analysis as well as simulation results show that dissemination using only vehicles in the opposite direction increases the data dissemination performance significantly. * This work is supported in part by the NSF under ITR ANI-0121416 and CNS-0520123 monitoring center. The problem with these systems is that they require expensive infrastructure to be installed on every road in which the system is going to be used. Additionally, they are not scalable owing to their centralized design. Vehicular Ad-hoc Networks (VANETs) are emerging as the preferred network design for intelligent transportation systems. VANETs are based on short-range wireless communication (e.g., IEEE 802.11) between vehicles. The Federal Communications Commission (FCC) has recently allocated 75 MHz in the 5.9 GHz band for licensed Dedicated Short Range Communication (DSRC)  aimed at enhancing bandwidth and reducing latency for vehicle-tovehicle and vehicle-to-infrastructure communication. The adoption of the DSRC spectrum for vehicle-to-vehicle communication is an indication of the increasing interest and expectations from this emerging technology. Unlike infrastructure-based networks (e.g., cellular networks), VANETs are constructed on-the-fly and do not require any investment besides the wireless network interfaces that will be a standard feature in the next generation of vehicles. Furthermore, VANETs enable a new class of applications that require time-critical responses (less than 50 ms) or very high data transfer rates (6-54 Mbps).