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Intelligent Transportation Systems (ITS), supporting the development of innovative vehicular applications, have benefited from major contributions in the field of wireless networking. Broadcasting is a crucial communication type for many domain-specific applications. In this work we focus on analytical modeling of multi-hop broadcast in vehicular networks and quantify its performance in terms of relevant...
This paper investigates the information dissemination process in wireless communication networks formed by vehicles. As vehicles are moving constantly, a vehicular ad-hoc network exhibits a highly-dynamic network topology and a fast-changing radio environment. These distinguishing characteristics result in random and unreliable wireless connections between vehicles. Consequently, vehicles need to...
This paper focuses on routing for vehicles getting access to infrastructure either directly or via multiple hops though other vehicles. We study Routing Protocol for Low power and lossy networks (RPL), a tree-based routing protocol designed for sensor networks. Many design elements from RPL are transferable to the vehicular environment. We provide a simulation performance study of RPL and RPL tuning...
Two quite different tools are normally used in the research of Vehicular Ad Hoc Networks (VANET). Simulators are practical and cost-efficient, but are not entirely accurate representations of the real life situation. Field operational tests (FOT) provide exactly the opposite characteristics. A wireless testbed is situated somewhere in between, but has not yet been applied in VANET research. In this...
Vehicular Ad hoc Networks (VANETs) has a high node mobility speed, frequently changed network topology and limited node movement directions. Simulation is the main method that obtained in the VENET's research. The simulation of VANET includes two main parts: the built of vehicular mobility model and the simulation of self-organizing wireless mobile network. The authenticity of network simulation result...
In this work we describe VIVAGr, a graphical-oriented real time visualization tool for vehicular ad-hoc network connectivity graphs. This tool enables the effective synthesis of structural, topological, and dynamic characteristics of VANET graphs, with a variety of parameters that affect the shape and characteristics of a vehicular ad hoc network (wireless range, mobility models, road-network topology,...
Vehicular Ad hoc Networks (VANET) is an open ad hoc network which has been a research focus, and plays an important role on road safety, traffic information service and so on. There is diverse information in VANET such as spatial information, GPS data which can be used to obtain better traffic service. In the paper, the Bayesian Networks (BN) is utilized to fuse different information to get accurate...
Vehicles equipped with communication capability, allows for inter-vehicle communication. Vehicular ad hoc network(VANET) is a subclass of MANET having no fixed infrastructure and rely on nodes to provide network functionality. Vehicular ad hoc network is dominated by its unique characteristics of rapid but predictable topology changes with frequent fragmentation and small effective network diameter...
Most Vehicular Ad Hoc Networks' (VANET) applications use broadcasting as a main block for safety messages' dissemination. The broadcast range is a critical parameter in the success of any VANET's safety application. Moreover broadcasting in its normal way may lead to a broadcast storm problem. In this paper we present a geometric model to predict the recommended maximum range of a one hop broadcast...
A Vehicular Ad Hoc Network (VANET) not only experiences highly mobile and frequently disconnected, but may also have to deal with rapid changes of network topologies, especially when accidents and road traffic jams happen. In this paper, we propose a novel approach to address this issue. Due to the intermittent connectivity in VANET, we adopt the idea of carry and forward, where a moving vehicle carries...
In this paper we present a study of mobile connectivity for vehicular network in urban environment. The considered area is a real map divided into equally sized cells, each characterized by a set of information including the type of structure in the cell, cell altitude and cell attraction for vehicles. These characteristics are taken into account in two models: vehicular mobility model and electromagnetic...
This paper addresses the problem of efficient data dissemination in Vehicular Ad Hoc Networks (VANETs), which particularly suffer from changing densities in the network topology due to congested and sparse traffic on the roads. We present a new network layer protocol in the family of geographic network protocols, which makes use of distance and time information following a dissemination strategy to...
Vehicular Ad-hoc Network (VANET) is an emerging new technology integrating adhoc network, wireless LAN (WLAN) and cellular technology to achieve intelligent inter-vehicle communications and improve road traffic safety and efficiency. Vehicles are able to exchange information within these networks without the need of installing any infrastructure along the roadside VANETs can be used to improve the...
Routing is a challenging task in the ad hoc networks, especially in vehicular ad hoc networks (VANETs) where the network topology changes fast and frequently. Since the nodes in VANETs are vehicles, which can easily provide the required power to run GPS receiver to get the accurate information of their position, the position-based routing is found to be a very promising routing strategy for VANETs...
Classical ad-hoc network algorithms become impractical for Vehicular Ad Hoc Networks when density of vehicles is low in rural areas and during the periods when the vehicle traffic is low in cities (such as at night). End-to-end connectivity requirement of these algorithms causes deflection. Connections get broken when a suitable network element isn't available for data transfer. This problem which...
Vehicular Ad hoc Networks appeared as a natural result of the evolution of the communication technology, which becomes able to satisfy the need of users to be connected anytime and anywhere. Providing comfort services such as Internet access or even vehicle traffic monitoring requires the use of road-side units (RSU) as gateways to the requested resources. Today, most of Intelligent Transport Systems...
In ad hoc networks the broadcast nature of the radio channel poses a unique challenge because the wireless links have time-varying characteristics in terms of link capacity and link-error probability. In mobile networks, particularly in vehicular ad hoc networks (VANETs), the topology is highly dynamic due to the movement of the nodes, hence an on-going session suffers frequent path breaks. In this...
In mobile networks, particularly in vehicular ad hoc networks (VANETs), the topology is highly dynamic due to the movement of the nodes, hence an on-going session suffers frequent path breaks. Disruption occurs either due to the movement of the intermediate nodes in the path or due to the movement of end nodes, demanding for routing protocols aware of frequent topology changes. In this paper we use...
The routing paths of vehicular ad-hoc network (VANET) in a city environment consists of many possible paths and junctions. Shortest path routing is not viable because each path has to be populated with vehicles. A scalable multi-hop routing protocol which adapts well to the city environment even with rapidly changing network topologies and lots of disconnected, sparse and dense network conditions...
Mobile ad hoc networks such as Mesh networks or Vehicular ad hoc networks (VANETs) are in most cases relying on infrastructure deployment to provide access to internet services or any kind of shared resources. Developing dedicated deployment strategies becomes hence essential. In fact, research proved that the backbone topology has noticeable impact on the network performance. The main contribution...
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