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Today, Intelligent Transportation System (ITS) applications has made a great impact on improving the quality and efficiency of the transportation system. This achievement has attracted researchers to propose more ITS applications, particularly to improve the transportation safety through Vehicular Ad Hoc Networks (VANETs). The major difficulty faced by these researchers is the verification of their...
Due to recent development in wireless communication networks, researches in Vehicular Ad-hoc Networks (VANETs) have been getting much attention on information sharing and service discovery. However, due to the ever-shifting mobility of vehicle topology, vehicles moving in non-fixed routes may not find suitable next-hop vehicles to pass the data. This paper proposes schemes to effectively circulate...
Vehicular ad hoc networks (VANETs) are emerging as a new network environment for intelligent transportation systems (ITS). In many applications envisaged for VANETs, traffic information needs to be disseminated to relevant vehicles during a duration of time. Here we present a model of warning message dissemination in VANETs. The idea in our model is that vehicles on a stretch of roads carry warning...
A novel vehicular driving navigation system based on VANET is presented. The hardware of the system is an ARM9 embedded device with GPS, 802.11 communication module and human machine interface (HMI). The HMI displays the driving states of the adjacent vehicles and the emergency road information to remind the driver of safety driving. A power control mechanism is also applied in this system to increase...
Effective intelligent transportation system depends on the abundance of timely road information. This paper first presents the role of road information by taking dynamic route guidance system as an example; and then explains the necessary of importing wireless sensor networks as road information providers. We illustrate the principle of using magnetic sensors to detect vehicles and how the road information...
In the last decade wireless communications significantly improved, being widely used in various areas such as health, education, industry and research. Recently, the automobile industry is adopting wireless technologies in order to improve the services offered, such as safety, route planning and infotainment. In particular, Vehicular Ad-Hoc Networks (VANETs) are being promoted to improve safety and...
This paper addresses Wireless Networks for Metropolitan Transports (WNMT), a class of moving or vehicle-to-infrastructure networks that may be used by public transportation systems to provide broadband access to their vehicles, stops, and passengers. We propose the WiMetroNet, a WNMT that is auto-configurable and scalable. It is based on a new Ad hoc routing protocol, the Wireless Metropolitan Routing...
Vehicular communications are becoming a reality under the push of increased transportation safety requirements and huge investments of several actors in the field like car manufacturers and Public Transport Authorities. As a consequence, the building blocks of the ”Vehicle Grid” (radios, Access Points, spectrum, standards, etc.) will soon be in place enabling a broad gamut of applications ranging...
In recent years, the issue of Vehicular Ad-Hoc Network (VANET) has received great attention, and more and more VANET-related researches have been brought up. Generally speaking, the biggest difference between VANET and traditional Ad-Hoc is the velocity of carriers because in VANET, the velocity of vehicles the carriers is much higher than that of the carriers in traditional Ad-Hoc. Furthermore, it...
Vehicular ad-hoc networks (VANETs) are promising for more and more intelligent transportation applications, where information is disseminated over a group of vehicles. VANETs are characterized for its unstable framework, in which the isolated vehicles communicate with others only when the unexpected meetings occur. As a result, some available data dissemination schemes do not work well in VANETs....
Vehicle-to-vehicle communication among vehicular ad hoc networks (VANETs) plays an important role in providing a high level of safety and convenience to drivers. Geographic routing protocol has been identified to be suitable for VANETs because of the special nature of such networks, e.g., frequently changed network topology and high dynamic mobility. There is considerable functional research about...
The main challenges in formulating efficient medium access control (MAC) protocols for vehicular ad-hoc networks (VANETs) are the fast mobility of vehicular nodes and hence, the high dynamicity of the network. VANETs present unique characteristics and hence, most MAC protocols for mobile ad-hoc networks (MANETs) might not be appropriate for VANETs. Research in the field of MAC protocols for VANETs...
IEEE 802.11p is an emerging standard intended to support wireless access in the vehicular environment and to deliver both safety and non-safety applications to vehicles on the roads. Despite the massive research effort related to the design of reliable and timely schemes for dissemination of safety messages, only a few works have investigated on-the-road delivery of non-safety data traffic, such as...
Rapid advances in the areas of computing, sensing, and communications have enabled vehicle manufactures to provide new features for vehicles to enhance safety, pleasure, convenience, and reliability. Moreover future vehicles are expected to become a part of the Internet, either as a network node, or as a hub constructing a vehicular ad hoc network. This vehicular ad hoc network represents large dynamic...
Vehicular ad hoc networks (VANETs) allow vehicle-to-vehicle communication and, in particular, vehicle-generated announcements. Vehicles can use such announcements to warn nearby vehicles about road conditions (traffic jams, accidents). Thus, they can greatly increase the safety of driving. However, their trustworthiness must be guaranteed. A new system for vehicle-generated announcements is presented...
Inter-vehicle communications (IVC) based on mobile ad hoc networks have drawn increasing research interests in recent years. In this paper, we study throughput in an IVC system along a unidirectional traffic for different traffic conditions and transmission ranges of wireless units. Here, whether a vehicle is equipped or not is random, and the probability is assumed to be the market penetration rate...
In last decade intelligent transportation systems (ITS) and vehicular ad hoc network (VANET) became one of the most active and emerging fields of research. It is expected that this technology will bring revolutionary changes in transportation system and offer various services to make journey safer, secured, and more comfortable. In the meantime, US FCC allocated a block of frequency spectrum (popularly...
VANET is an ad hoc network composed of highly mobile vehicle nodes. Many routing protocols utilize traffic information as a critical metric for determining optimal message forwarding path. The existing traffic information systems are not suitable for routing decision either because of the huge development and maintenance cost or due to the insufficient information provision. In this paper, a new distributed...
The basic objective of congestion control is to best exploit the available network resources while preventing sustained overloads of network nodes and links. Appropriate congestion control mechanisms are essential to maintain the efficient operation of a network. Ensuring congestion control within vehicular ad hoc networks address special challenges, due to the characteristic and specificities of...
In the last few years the scientific community has shown a growing interest regarding infrastructures for vehicular ad hoc networks (VANETs) communication as a special application of the more generic mobile ad hoc networks (MANETs). Adoption of a public transportation network as a VANET backbone - thanks to the full area coverage and a pre-scheduled repetitive path - can be an interesting solution...
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