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.

An efficient pre-scanning scheme for handoff in Cooperative Vehicular Networks

Abstract: In Wireless Access in Vehicular Environments (WAVE), the terminal devices are usually highly mobile vehicles or transportation tools, which handoff much more frequently than those in wireless networks However, the quality of network services, like VoIP and multimedia streaming, will be seriously influenced by too frequent handoff or too long handoff latency As a result, traditional handoff mechanisms no longer satisfy the need of vehicular communications At present, most existing fast handoff mechanisms are based on the signal strength of the APs, which does not suit vehicular communications fully Generally speaking, the regional traffic in Vehicular Ad-hoc Networks (VANETs) keep changing and varying For example, on busy roads or in rush hours, the increase of number of vehicles may lead to the network congestion and degrade the performance of vehicular communications substantially Therefore, this paper presents the QualityScan scheme, an efficient pre-scanning method to improve the handoff performance in VANETs With the attempt to reduce the handoff latency and maintain the load balance among the APs, our proposed scheme regularly collects the loading states of the nodes by the pre-established AP controller (APC), and predicts the network traffic of the next moment Consequently, Mobile Nodes (MNs) can select the most suitable AP for the best QoS according to the parameters received by passive scanning, while more QoS parameters should participate in cooperation The simulation result proves that our proposed scheme not only maintains the QoS and the load balance among the nodes, but also further enhances the handoff performance in VANETs

An Efficient Cluster-Based Data Sharing Algorithm for Bidirectional Road Scenario in Vehicular Ad-hoc Networks

Abstract: Efficient data sharing in vehicular ad hoc networks (VANETs) is one of the fundamental requirements to enable emerging intelligent transportation systems. Much research has focused on the routing algorithms and MAC protocols in VANETs. However, unique characteristics of data sharing for bidirectional road scenarios make it challenging to design an efficient scheduling algorithm. In this work, we present the data sharing model among vehicles driving in opposite directions, and investigate the potential interference caused by simultaneous vehicle-to-vehicle (V2V) communications. On this basis, we propose a cluster-based algorithm to implement efficient data sharing in bidirectional road scenarios. Specifically, we design a time slot division policy to assign the clusters with specific slots according to the driving directions and relative positions of vehicles. Then, based on certain required quality of services, we derive a theoretical model by analyzing the signal-to-interference-and-noise ratio (SINR) in V2V communications, which determines how to divide vehicles into different clusters. Finally, we build the simulation model and give an extensive performance evaluation, which demonstrates that the proposed algorithm is efficient in terms of enhancing data throughput under different traffic workloads.

Controller Area Network for intelligent vehicular systems

Abstract: With the advent of the 21st century the inclusion of electronic systems in almost all the aspects of life is very common. Technology advancements have provided intelligent systems with advanced functionalities that could ease any given process. The 21st century has been evident of the ground breaking research carried out in vehicular technologies. Various electronic driver assist systems have been employed for ensuring ease and safety of the users. Modern day cars represent a symbiosis of several electronic subsystems that collaboratively give a safe and sound driving experience. The complexity of the functions implemented in these systems necessitates an exchange of data between them. With conventional systems, data is exchanged by means of dedicated signal lines, but this is becoming increasingly difficult and expensive as control functions become ever more complex. Controller Area Network is a high performance and high reliable advanced serial communication protocol which effectively supports distributed real time control. The concept plans to make a prototype displaying communication pattern between various electronic modules of a car.

A comparison of vehicular trajectory encoding techniques

Abstract: The transmission of vehicular trajectory information is one basic building block of car-to-car communication. Frequently, this information is transmitted as raw data, i. e., as a sequence of location measurements. In this paper we argue that, due to the laws of physics and the requirement to follow a road, vehicular mobility has very specific characteristics. Hence, vehicular trajectory information can be compressed very efficiently using domain-specific lossy compression schemes. We discuss and compare three promising approaches that can be used to this end: linear approximation, cubic splines, and clothoids.

A Survey of Broadcast Protocols for Vehicular Ad-hoc Networks

Abstract: Vehicular ad-hoc networks have become the most popular application to enhance traffic safety. The traffic safety by disseminating safety messages is considered as one of the most important applications of vehicular ad-hoc networks. Broadcasting is considered as the most suitable communication mechanism to disseminate the safety message in vehicular ad-hoc networks. When an accident happens on a road, the safety message should be broadcasted to all vehicles in the area exposed to potential hazard. Broadcasting is the process in which a source vehicle sends a message to all other vehicles in vehicular ad-hoc networks. The safety message can help human drivers to enable smooth and safe driving by providing the drivers in various risk traffic environments. This paper describes a survey on broadcasting protocols for vehicular ad-hoc networks, and discusses briefly discuss applications of vehicular ad-hoc networks. Classification and comparison of broadcasting protocols are also described from their pros and cons. From the classification and comparison, this survey makes it possible to provide a variety of considerations that are required for designing a new broadcasting protocol in vehicular ad-hoc networks.