Search results for "VANET"

ADM : A Density And Priority Levels Aware Protocol For Broadcasting In Vehicular Ad-Hoc Networks

2014

The broadcasting communication mode is widely used in Vehicular Ad~hoc Networks (VANETs). It is used for sending emergency messages, road-traffic information or to help routing protocols to determine routes. This communication mode is known to be hard to achieve efficiently since it depends on the network density. Indeed, broadcasting methods may cause network congestion if they are not well designed. This paper introduces a novel Autonomic Dissemination Method (ADM) which delivers messages in accordance with given message classes and network density levels. The proposed approach is based on two steps: an offline optimization process and an online adaptation to the network characteristics. …

The quarry waste "Ravaneti" in Sicily: geomorphologic aspect

2009

VANET prototipa realizācija ar WiFi protokolu palīdzību

2016

VANET tehnoloģija ļauj automobiļiem savā starpā komunicēt un informēt vienam otru par bīstamām situācijām uz ceļa. Veicot ES ceļu satiksmes negadījumu skaitu izpēti ir redzams, kā ir nepieciešama sistēma, kas spēj atbalstīt automobiļa vadītājus ceļā. Maģistra darba pētījuma mērķis ir izpētīt VANET tehnoloģiju, tās aktualitāti un iespējas, un izstrādājot prototipu izdarīt pētījumu, kurā pēc eksperimentu rezultātiem varēs izdarīt secinājumu, vai WiFi protokols spēj realizēt VANET tehnoloģiju nepieciešamā apjomā. Maģistra darbs sadalīts deviņās nodaļās. Darba pirmajā daļā tiek apskatīta un pētīta teorētiskā daļa, bet otrajā daļā tiek izveidots WiFi prototips un veikti eksperimenti. Maģistra da…

Collaborative Content Downloading in VANETs with Fuzzy Comprehensive Evaluation

2019

Vehicle collaborative content downloading has become a hotspot in current vehicular ad-hoc network (VANET) research. However, in reality, the highly dynamic nature of VANET makes users lose resources easily, and the transmission of invalid segment data also wastes valuable bandwidth and storage of the users&rsquo

Optimization of Data Harvesters Deployment in an Urban Areas for an Emergency Scenario

2013

International audience; Since its appearance in the VANETs research community, data collection where vehicles have to explore an area and collect various local data, brings various issues and challenges. Some architectures were proposed to meet data collection requirements. They can be classified into two categories: Decentralized and Centralized self-organizing where different components and techniques are used depending on the application type. In this paper, we treat time-constrained applications in the context of search and rescue missions. For this reason, we propose a centralized architecture where a central unit plans and manages a set of vehicles namely harvesters to get a clear ove…

Ajoneuvojen langattomissa verkoissa (VANET:ssa) toimivien turvallisuussovellusten tietoturvallisuus

2017

Tieliikenteessä ilmenevien ongelmien, kuten onnettomuuksien ja ruuhkien ratkaisuissa on alettu hyödyntää tieto- ja viestintäteknologiaa. Tällaisia ratkaisuja kutsutaan älykkäiksi liikennejärjestelmiksi. Älykkäiden liikennejärjestelmien avulla voidaan lisätä tärkeän ja hyödyllisen tiedon vaihtoa tiellä liikkujien kesken. Tässä tiedonvaihdossa ajoneuvojen langattomat verkot eli VANET nähdään keskeisenä teknologiana, sillä niiden avulla ajoneuvot voivat automaattisesti kommunikoida keskenään sekä tieinfrastruktuurin kanssa. VANET mahdollistaa useita liikenteen turvallisuutta parantavia sovelluksia, eli turvallisuussovelluksia, mutta muiden langattomien verkkojen tavoin myös VANET sekä sen avul…

Video Streaming Distribution in VANETs

2011

Streaming applications will rapidly develop and contribute a significant amount of traffic in the near future. A problem, scarcely addressed so far, is how to distribute video streaming traffic from one source to all nodes in an urban vehicular network. This problem significantly differs from previous work on broadcast and multicast in ad hoc networks because of the highly dynamic topology of vehicular networks and the strict delay requirements of streaming applications. We present a solution for intervehicular communications, called Streaming Urban Video (SUV), that 1) is fully distributed and dynamically adapts to topology changes, and 2) leverages the characteristics of streaming applica…

Col : A Data Collection Protocol for Vanet

2012

International audience; In this paper, we present a protocol to collect data within a vehicular ad hoc network (VANET). In spite of the intrinsic dynamic of such network, our protocol simultaneously offers three relevant properties: (1) It allows any vehicle to collect data beyond its direct neighborhood (i.e., vehicles within direct communication range) using vehicle-to-vehicle communications only (i.e., the infrastructure is not required); (2) It tolerates possible network partitions; (3) It works on demand and stops when the data collection is achieved. To the best of our knowledge, this is the first collect protocol having these three characteristics. All that is chiefly obtained thanks…

Modeling Efficient and Effective Communications in VANET through Population Protocols

2021

Vehicular Ad-hoc NETworks (VANETs) enable a countless set of next-generation applications thanks to the technological progress of the last decades. These applications rely on the assumption that a simple network of vehicles can be extended with more complex and powerful network infrastructure, in which several Road Side Units (RSUs) are employed to achieve application-specific goals. However, this assumption is not always satisfied as in many real-world scenarios it is unfeasible to have a conspicuous deployment of RSUs, due to both economic and environmental constraints. With the aim to overcome this limitation, in this paper we investigate how the only Vehicle-to-Vehicle (V2V) communicati…

Collecte des données Véhicule/Environnement et remontée avec réseau Cellulaire et réseau Véhiculaire

2019

Vertical handover is one of the key technologies that will facilitate the connected and autonomous vehicles deployment. Today, the emergence of Vehicular Ad hoc Networks (VANETs): Vehicle-to-Vehicle (V2V) communications, Vehicle-to-Infrastructure (V2I) and Vehicle-to-Everything (V2X) has enabled new applications such as Cooperative Intelligent Transport Systems (C-ITS), real-time applications (for example, autonomous driving), road traffic management applications and comfort applications. However, these networks are characterized by a high level of mobility and dynamic change in the topology, which generates scattered networks and requires handover mechanisms for maintaining ongoing session…