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Vehicular ad-hoc networks (VANETs), an important communicational infrastructure and essential component of Intelligent Transportation System (ITS) used for virtual warnings can be effectively used through connectivity-aware geocasting in intersection based urban traffic environment. Road safety and security can be enhanced remarkably by incorporating traffic signal values and predicting the probability...
Along with advances in technologies and equipment of vehicles with communication devices, vehicular networks were developed. Various applications are proposed and defined for these networks, and as the number of deaths caused by accidents are increasing, safety applications became the most important one. Dynamicity of the nodes in addition to wireless transmission problem cause challenges for disseminating...
Vehicular ad hoc networks (VANETs) allow vehicles to form a self-organized network without the need for permanent infrastructure. As a prerequisite to communication, an efficient route between network nodes must be established, and it must adapt to the rapidly changing topology of vehicles in motion. Improving efficiency and fairness for City Environment becomes a hot topic own to its increasing challenge...
Since mobile device technology has emerged, users expect to experience more convenience and higher safety in Vehicular Ad Hoc Networks (VANETs). VANETs comprise a special subclass of Mobile Ad Hoc Networks (MANETs). The topology frequently changes, encountering frequent disconnection. Hence, designing a feasible routing protocol is challenging. Such protocol is known as vehicle to vehicle (V2V) and...
We present TraJECT-3D (Track and Junction based Exploit over Complex Terrain), a realistic generator of node movement trajectories for simulating tactical Mobile Ad-Hoc Networks (MANETs). TraJECT-3D models the macro- and micro-mobility of different types of tactical nodes (e.g., soldiers, scouts, vehicles, UAVs) with a bidirectional track and junction strategy. The novel aspects and distinguishing...
Vehicular Ad hoc Networks (VANETs) have received great attention in recent years, and multi-hop routing becomes an important issue for VANETs-based applications. This paper introduces an routing protocol based on opportunistic forwarding called Multi-Metric Opportunistic Routing (MMOR), which imports the multi metrics into analysis of the best opportunistic next forward node while route link is being...
Vehicular traffic density is a key factor in determining the behaviour of radio overlapping and thus impacts performance of data and safety message communication in Vehicular Ad hoc Networks (VANETs). In this paper, we propose a novel density model for urban traffic systems and employ this model for the purpose of spatial-temporal analysis of radio overlapping. To model traffic density, we consider...
In traffic safety applications for Vehicular Ad hoc Networks (VANETs), warning messages have to be disseminated whenever a dangerous situation occurs to alert nearby vehicles. Using inefficient broadcast schemes may lead to ineffective dissemination of warning messages causing broadcast storm problems. In the past, several approaches have been proposed to reduce the so called broadcast storm in multi-hop...
The increased traffic density in urban areas should be handled by a robust collision avoidance and traffic control system that is based on decentralized inter-vehicle communication. In such a special ad hoc network traditional routing protocols cannot cope with the high mobility and low link reliability, while flooding based approaches consume too many resources. Our proposed solution, Carefully Localized...
In this paper, we present analytical models to study the packets delivery probability on intersections for VANETs(Vehicular ad hoc networks) in city scenarios. These models can help better understand data propagation in this environment. We show that the delivery probability is strongly related to the traffic conditions of the road where the information is to be transmitted. We also validate our analytical...
The vehicular ad hoc network (VANET) is an emerging new technology. Developing multi-hop routing protocols for urban VANETs is a challenging task due to many factors such as frequent network disconnections. Many VANET routing protocols use a carry-and-forward mechanism to deal with the challenge. However, this mechanism introduces a large packet delay, which might be unacceptable for some applications...
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...
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...
Multihop data delivery in vehicular ad hoc networks (VANETs) suffers from the fact that vehicles are highly mobile and inter-vehicle links are frequently disconnected. In this paper, we propose a multihop vehicle-to-infrastructure routing protocol named Vertex-Based Predictive Greedy Routing (VPGR), which predicts a sequence of valid vertices (or junctions) from a source vehicle to fixed infrastructure...
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...
The network topology of vehicular ad-hoc network (VANET) in a city environment consists of many possible paths and junctions that forms the routing paths. Shortest path routing is not viable because each path has to be populated with vehicles. A scalable multi-hop routing protocol that adapts well to the city environment even with rapidly changing network topologies and lots of disconnected and dense...
Thanks to the advances in wireless technologies, mobile vehicular networks are likely to become the most relevant form of mobile ad hoc networks (MANET). Vehicular communication which facilitates the exchange of information between vehicles is the prerequisite not only for extending the access to Internet while on the road, but also to cater for special applications such as of road traffic and travel...
Routing is crucial to the success of VANET applications, which is complicated by the fact that VANETs are highly mobile, and sometimes partitioned. This paper proposes a contention based routing protocol for VANETs in city environments. Different from the position based routing, this protocol does not require the node to maintain its neighborspsila locations. Junctions through which a packet must...
The vehicular ad hoc network (VANET) is an emerging new technology and is a promising approach for the intelligent transportation system (ITS). In comfort and safety applications, a vehicle may need to query data from another vehicle via multihop communications. Data routing in the VANET environment suffers from frequent disconnections due to high mobility and sparsely connected networks. Data delivery...
Routing plays important role in VANET applications but due to rapidly changing topology and high speed mobility of vehicles, conventional routing protocols suffer heavily. Current MANET routing protocols fail to fulfill these needs. In this paper we propose a VANET routing protocol that is especially designed for city environments. It consists of two parts: (1) Selection of next junction dynamically...
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