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 vehicular ad-hoc networks (VANETs), moving vehicles carry data and exchange it as they pass each other. Storage in a vehicle, in other words, the amount of saved data is limited resource in general. Therefore, attributes of data that should be carried by vehicles is an important factor in order to efficiently disseminate desired data. In this paper, we focus on popularity of data and propose probabilistic...
In this paper, a new MAC protocol, called Reliable Busy Tone Multiple Access with Neighboring Information Table (RBTMA-NIT), is proposed for safety applications in Vehicular ad hoc networks (VANETs). Derived from the conventional busy tone multiple access (BTMA), RBTMA-NIT introduces three mechanisms to reduce the transmission delay of emergency messages: 1) the original emergency message and its...
In this paper, a distributed taxi hailing protocol in vehicular ad-hoc networks (VANET) is suggested. Our protocol consists of two parts: taxi booking and taxi de- blocking. Taxi booking part ensures that a vacant taxi with shortest driving distance to passenger under real traffic regulations is booked. Taxi de-blocking part aims to de-block blocked vacant taxis as soon as possible. Simulation results...
Most of routing protocols in VANETs are position-based due to their well scalability. The forwarding decisions of such protocols are simply based on the location information of forwarders' neighborhood and the destination node. Due to high mobility of vehicles, location-service protocols are required to provide the destination location. Location services protocols can be categorized as flooding-based...
In this paper, we propose a realistic resource sharing protocol for VANET. The main idea of our protocol comes from typhoons. Typhoons move according to their eyes' mobility, i.e., quorums which are responsible for a given resource holder/requester "moves" according to the resource holder's/ requester's mobility. Our protocol exploits spatial locality between requesters and resource holders...
Speech communication is an important application in vehicular ad hoc network (VANET). The ID of vehicles plays a role on building speech communication. However, there are no servers like DNS in VANET. Through flooding messages including a node's information periodically, its neighbor nodes can get its ID and IP. However, flooding in a network may result in network paralysis. So some factors of the...
A number of Intelligent Flooding Schemes have been recently proposed to optimize message dissemination in Vehicular Ad Hoc Networks. Some of them exploit a distributed timer-based contention mechanism in order to allow the most suitable nodes to forward the packet and to suppress other potential forwarders. Unfortunately, due to some problems related to the suppression mechanism, most of these schemes...
Distributed traffic information systems apply inter-vehicular ad hoc communication to disseminate road traffic information. The high amount of traffic information carried and flooded along the road network leads to superfluous forwarding, which is usually reduced by using rate- or spatial- adaptivity in the dissemination mechanisms. However, in certain cases due to the lack of context-aware information,...
Vehicular ad hoc networks (VANETs) are an important example of mobile ad hoc networks (MANETs) because they can save lives by improving safety on our road networks. They are difficult to design however due their inherent characteristics e.g., quickly changing topology, node density and relative speeds of vehicles. These characteristics also make current wireless media access control (MAC) protocols...
Inter-vehicle communications (IVC) based on mobile ad hoc networks have attracted increasing attention of researchers recently. In this paper, we study the communication performance of IVC networks in multilane dynamic traffic streams. We are concerned with the influence of several traffic factors on multilane communications, such as vehicles' high mobility, traffic directions or relative speed, and...
In this paper, we present a performance evaluation study analyzing the behavior of a generic warning message dissemination (WMD) mechanism in a 802.11p based VANET. In our WMD method, warning-mode vehicles notify nearby vehicles in order to improve traffic safety and to control traffic congestion. Our evaluation uses 2k factorial methodology to determine the most representative factors that affect...
Deploying and testing vehicular ad hoc networks (VANETs) involves high cost and intensive labor. Hence simulation is a useful alternative prior to actual implementation. Most works found in the literature employ very simplistic radio propagation models (RPMs), ignoring the dramatic effects presented by buildings on radio signals. In this paper, we present three different RPMs that increase the level...
In this paper a new clustering algorithm for vehicular ad-hoc networks (VANET) is presented. The proposed solution is a modification of the Basagnipsilas distributed and mobility-adaptive clustering (DMAC) algorithm. Some additional conditions that have to be fulfilled before the cluster head change, are introduced to better suit the road traffic. Tests performed in the simulation environment consisting...
The underwater target localization problem is one important application for underwater acoustic sensor networks. This paper, based on "underwater acoustic transmission theory", solves the target localization problem. The proposed algorithm firstly studies the principle of underwater acoustics and applies it to set up the model of underwater signal energy transmission. According to the model,...
The 802.11p protocol, also known as wireless access for the vehicular environment (WAVE), has recently gained momentum in the area of research and development. The WAVE protocol provides enhancements to the physical (PHY) and medium access control (MAC) layers of the existing 802.11 wireless standards. These enhancements are required to support the intelligent transportation systems (ITS) initiatives...
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.