Vehicular communication systems

About: Vehicular communication systems is a research topic. Over the lifetime, 2532 publications have been published within this topic receiving 64775 citations. The topic is also known as: V2V & vehicle-to-vehicle.

QoE-Based Flow Management in Software Defined Vehicular Networks

Abstract: In vehicular networks, high mobility and limited transmission range of Road-Side Units (RSU) cause dynamic topological changes and result with interference occurred by transmission of vehicles. Moreover, due to the limited bandwidth of IEEE 802.11p based vehicular communication, providing a fair share of network resources among vehicles is essential for an efficient network management. Therefore, flow and interference management challenges cause a degradation in percentage of flow satisfied by effecting quality of communication and enhancing interference in vehicular networks. These aforementioned two challenges can be mitigated with Software-Defined Networking (SDN) paradigm where a centralized controller can schedule data flows and then coordinate power level of vehicles. Hence, in this paper, the cooperation of SDN and IEEE 802.11p based vehicular communication has been proposed in vehicular networks. We present a novel software- defined flow and power management model implemented into controller. Here, we classify vehicles based on Quality of Experience (QoE) and model RSUs with a queuing theoretic approach. Then the proposed model is used to detect unsatisfactory vehicles and estimate effective and accurate amount of transmission power of these vehicles so that unsatisfactory vehicles will be served a new assigned RSU with optimal signal level. Moreover, we redefine flow label field in OpenFlow flow table so that controller can manage to RSUs by imposing some behaviors. Numerical results show how a better flow satisfied can be maintained by implementing this idea.

An Empirical Study on Ad Hoc Performance of DSRC and Wi-Fi Vehicular Communications

Abstract: The primary motivation for developing vehicular safety applications is to provide information and assistance required to avoid collisions. Such applications depend on performance of vehicular communications which have critical requirements for various operating scenarios. However, there is still a lack of practical performance measurement data in the open literature that can be used to design robust and reliable applications for vehicle safety. This paper provides an overview of the current standards for vehicular communications and requirements for vehicular applications and analyzes ad hoc performance of commercial off-the-shelf DSRC and Wi-Fi radios in real vehicular environments. Also, it identifies important effects of messages size, message frequency, weather condition, and vehicle mobility on vehicular communications. For example, rainy weather significantly diminishes the communication range and vehicle mobility causes temporal variations in communication throughput. With a better comprehensive understanding of these effects on performance and reliability, quality of vehicular applications can be significantly improved.

How effective is to look at a vehicular network under a social perception

Abstract: Vehicular Mobility is strongly influenced by the speed limits and direction of the public roads. At the same time, the driver's behavior produces great influences in vehicular mobility. People tend to go to the same places, at the same day period, through the same trajectories, which le ad them to the appearance of driver's daily routines. These routines lead us to the study of mobility in VANETs under a social perspective and to investigate how effective is to explore social interactions in this kind of network. The work herein proposed presents the characterization and evaluation of a realistic vehicular trace found in literature. Our aim is to study the vehicles' mobility in accordance to social behaviors. With our analysis is possible to verify the existence of regularity and common interests among the drivers in vehicular networks. Finally, we discuss how the social metrics may be used to improve the performance of protocols and services in Vehicular Networks.

Using Technology to Make Roads Safer: Adaptive Speed Limits for an Intelligent Transportation System

Abstract: Adaptive speed limits (ASLs) is a promising technique that can be used to enhance the driving conditions on various road types. Consequently, a tremendous reduction in social costs can be achieved in areas such as accidents, pollution, congestion, noise, and greenhouse gas emissions. One of the essential factors in determining the efficiency of variable speed limit traffic systems is the dissemination of the adjusted speed limit. Several research studies indicate that in-vehicle driver notification significantly outperforms dynamic roadside speed limit signs.