The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In recent years the number of automobiles have been increased on the roads. Due to high density of vehicles, the potential threats and road accidents are increasing. Alongside new application domains are evolving such as infotainment. VANETs is an emerging technology where the information is exchanged among the vehicles on the road to provide updates about different road situations and dangerous conditions,...
Inter-Vehicle Communication is expected to be widely adopted during the next years by the car industry, enabling Vehicle-to-Vehicle and Vehicle-to-Infrastructure communication targeting at safer commuting. Therefore, the research community have been working towards providing a robust communication solution that will interoperate with existing network infrastructure and will provide an effective way...
In this paper, we have proposed proactive approach for fast-handoff using Access Point (AP) in Vehicular Ad-hoc Network (VANET). The existing schemes are based on context transfer for fast hand-off, but needs to reduce the latency of hand-off for VANETs. Fast hand-off in vehicle scans only the selected AP at any instance of time depending upon the association pattern. The Fast Hand-off Algorithm using...
The article introduces an integrated network and traffic simulation platform called Opnet (Optimized Network Engineering Tool). This platform provides the capabilities of network simulation and network protocol simulation. In this paper, we simulate two layer network models with WiFi and WiMAX scenarios and compared their throughput and load HTTP and FTP protocols. Evaluating the performance of these...
Maximization of the network throughput when broadcasting has the important significance to make full use of the wireless network resource, as VANET is applied to vehicle fleet. According to analysis on the relationship between network throughput and vehicle fleet numbers, node density, velocity of fleet & working mechanism of 802.11 broadcast protocol, this paper puts forward a self-adaptive...
For their safety, it is always necessary for drivers to inspect and understand their own vehicle's condition. Such a case, however, most drivers would like to directly get in touch with a vehicle specialist to repair the matters, as a result, they are forced to squander their time and cash. Even if they can check their vehicle's status by themselves by using a variety of functions of their own smart...
In recent works, a priority-aware deterministic access protocol that is based on 802.11p/DSRC was introduced to allow vehicles to access the shared medium in collision-free periods. The VANET Deterministic Access (VDA) protocol as introduced in [8] has no mechanism that prevents a non VDA-enabled vehicle from accessing the channel in a scheduled VDA opportunity (VDAOP). A non VDA-enabled vehicle,...
Vehicular Sensor Network (VSN) is being seriously considered as a key enabling technology as it allows vehicles to communicate with each other (v2v) and/or with roadside infrastructure (v2r). Effectively use of wireless communication can enhance various types of traffic applications. Dedicated Short-Range Communication (DSRC) standard is an ideal candidate for supporting wireless access in VSN environment...
The research on driverless cars has been making much progress lately. In this paper, we propose a new traffic control system without traffic lights at an intersection. We assume a system with fully autonomous driverless cars, and infrastructure to avoid collision completely. When automobiles approach an intersection, they communicates with the access point in both random access mode and polling mode,...
The medium access control protocol of a future vehicular ad-hoc network is expected to cope with highly heterogeneous conditions. An essential parameter for protocols issued from the IEEE 802.11 family is the minimum contention window used by the backoff mechanism. While its impact has been thoroughly studied in the case of wireless local area networks, the importance of the contention window has...
In this work, we provide an overview of an innovative approach for effective cross-network information dissemination, with applications to Vehicular Ad-hoc Networks (VANETs). In particular, we describe the main approach followed in an on-going bilateral Italy-Israel project (“Cross-Network Effective Traffic Alert Dissemination,” X-NETAD). The X-NETAD project leverages on the spontaneous formation...
Intelligent Transport Systems envision many applications relying only on vehicle-to-vehicle communications. Depending on the application (road safety, driver information, infotainment...), the requirements are different in terms of throughput, delay and loss rate. This paper explores the performances issues of a convoy of vehicles on the road, in order to estimate the capacity of such linear vehicular...
Vehicular networking is nowadays very hot topic within the research field of telecommunications. Lot of different approaches exist, although the standard approach called IEEE 802.11p is gaining the majority of interest. Even if IEEE 802.11p seems to be the main approach, the operability in real conditions has not yet been under careful consideration. This paper presents the vehicular networking simulations,...
In recent years, eco-friendly transportation is becoming more and more important. Unmanned vehicle has attracted many researchers' attention from both the academia and industry of, notably, US, EU and Korea. Unmanned vehicle is widely accepted in many public places due to its reliability, security, pollution-free and low-speed. Under these circumstances, inter-vehicle communications has become an...
End-to-end delay is critical for the real-time safety message delivery in Vehicular Ad Hoc Networks (VANETs). In this paper, we present an analytical model to evaluate the impact of transmission range on the end-to-end delay in 802.11p-based VANETs. Compared with the previous works, our model derives a concise expression of the transmission delay in saturated networks, and obtains the service rate...
Multi-vehicle systems composed of Autonomous Guided Vehicles (AGVs) are largely used for industrial transportation in manufacturing and logistics systems. Deployment of a team of AGVs raises management and coordination problems such as deadlock and collision avoidance, conflict resolution, and shared resources negotiation. Decentralized approaches are more suitable than centralized ones for dealing...
This paper presents a video demonstration of a platform for data dissemination for vehicular Networks developed by France Telecom R&D. The aim of this platform is to disseminate infotainment information (e.g. advertisement applications, etc.) in a predefined zone. This platform is based on an optimized dissemination protocol called ROD (Road Oriented Dissemination).
Ad-hoc multi-hop broadcast protocols are usually used in vehicular networks to provide safety services. However, these protocols face several issues, namely broadcast storms, hidden nodes, and message delivery failures, that prevent safety applications from guaranteeing their required high message delivery ratio and low delays. In this paper, we tackle these issues using a novel cluster-based contention-free...
Wireless vehicular communications (WVC) has been identified as a key technology for intelligent transportation systems (ITS) for a few years ago. IEEE 802.11p is the proposed standard for physical and MAC layer of WVC devices. The main objective of the standard is to change the frame format and increase delay spread tolerance introduced by vehicle mobility, in which the channel bandwidth is scaled...
Wireless vehicular communications (WVC) has been identified as a key technology for intelligent transportation systems (ITS) for a few years ago. IEEE 802.11p is the proposed standard for physical and MAC layer of WVC devices. The main objective of the standard is to change the frame format and increase delay spread tolerance introduced by vehicle mobility, in which the channel bandwidth is scaled...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.