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In a vehicular ad hoc network (VANET), vehicles attempt to improve safety by emitting safety messages that others receive to increase their awareness of one another. Yet, the conflicting data delivery requirements of safety applications can potentially jeopardize safety itself. While many information dissemination techniques have been proposed to improve data delivery in a VANET, such as flooding...
Recent years, Vehicular ad hoc Network (VANET) attracts tremendous attention due to its broad application prospects. However, channel fading, frangible link, unstable network topology caused by vehicles' high mobility and strict requirements to the quality of service (QoS) have become major challenges of VANET. Many algorithms have been proposed to ensure a stable network topology and it has been...
Understanding vehicle mobility is essential for devising successful protocols for vehicular communications. Vehicles move at varying speeds on roads whose complexities range from plain highway lanes to urban boulevards with intersections/circles, traffic lights and various points of interest on them. This mobility pattern combined with vehicle density fluctuations depending on location and time makes...
Enabling vehicles to connect to the best available communication medium in a heterogeneous network is of high importance to preserve good quality of service (QoS), however a hard task to handle. The ISO-CALM (Communications Access for Land Mobiles) offers the possibility to manage multiple communication interfaces with a promising architecture, but without any specific implementation. Several techniques...
Vehicular Ad-hoc NETworks (VANETs) have unique characteristics, such as the high mobility of nodes, which cause frequent losses of connectivity, turning technology and network selection into a complex problem. Moreover, due to the instability of networks and its fast change, this network selection requires information of the networks in advance, so that it can predict the quality of the networks to...
Vehicular Ad Hoc Network (VANET) is considered promising for ubiquitous communication on roadways and one-hop broadcast plays a leading basic role in VANET. Thus, there is a strong need of high reliability related to packet transmission and reception especially when VANET is used for life-safety applications. Though IEEE 802.11p has been defined as an international standard for VANET, IEEE 802.11p...
Recently, involving wireless communication technologies in deployment of new vehicular networks becomes more attracting to the research community and the vehicle manufacturers. It is beneficial in providing intelligent transportation system as well as new assistant services to drivers. However, the limitation of resources in mobile vehicles is a significant technical challenge in the deployment of...
Most of the emerging applications for road safety and traffic management rely on the frequent exchange of awareness messages among vehicles. Unfortunately, the 802.11 protocol poorly behaves under congested scenarios and cannot guarantee the reliability and timeliness demands of massively transmitted broadcast messages, leading to the severe degradation of safety. Recently, there has been a consensus...
In the last years, the interest on vehicular networking has incredibly increased in the scientific and industrial community, due to the enormous potentialities that this emerging technology offers. In this context, routing protocols become fundamental for enhancing QoS, related to the different services offered to final users. The implementation of new routing protocols becomes challenging in VANETs...
This paper deals with a clustering approach for VANETs operating in highway scenarios, where a certain degree of correlation among vehicles emerges such that a group mobility pattern is expected. The proposed protocol is inherently mobility driven as the reference metric to select a Cluster Head (CH) takes into account the node connectivity within an estimated coherence time interval. Our clustering...
Safety applications in VANET use two types of messages (a)periodical messages/beacons: they are broadcast several times per second to exchange information with neighbors; and (b) warning (event driven) messages: they are generated when an event occurs (e.g., a car accident) and are disseminated in the network to notify nodes of interest. Although warning messages have higher priority, beacons are...
Integration of Vehicular Ad-hoc Network (VANET) and Universal Mobile Telecommunication System (UMTS) is a promising architecture for future machine-to-machine applications. This integration helps the vehicles have steady Internet connection through UMTS network and at the same time can communicate with other vehicles. However, the dead spot areas and unsuccessfully handoff processes due to the high...
In the past few years we are witnessing increased interest in the research of inter-vehicle communications. Due to vehicle specific movement patterns new algorithms and solutions have to be developed. Clustering is a technique for grouping nodes in geographical vicinity together, making the network more robust and scalable. This article presents an overview of proposed clustering algorithms for use...
Dead spot and out of coverage problem are serious problems especially in the rural and suburban areas where the network infrastructure is not deployed. In this paper, a new end to end multi hop relay scheme for vehicular communication is proposed to extend the coverage or/and relaxing frequent handoff process. The scheme allows vehicles to continue connected to infrastructure network i.e. UMTS. Relay...
Vehicular networks are meant to exist wherever the road will take them. This includes small towns, rural highways, suburbs, downtown urban centers, and urban highways. The density of vehicles varies greatly across these environments. This work looks at the effects of implementing Quality of Service (QoS) as well as a relatively similar method that inserts stochastic delays in pseudonym (PN) transmission...
Vehicular Ad hoc Network (VANET) is a special type of Intelligent Transport System (ITS), The design of routing protocols in VANETs is important and necessary issue for support the smart ITS. The key difference of VANET and MANET is the special mobility pattern and rapidly changeable topology. Existing routing protocols of MANET are not suitable for VANET. This paper proposes SD-AOMDV as VANET routing...
VANET (Vehicular Ad-hoc NETwork) is comprised of devices that are installed inside vehicles and on road sides. Since vehicles can move randomly and at various velocities, the network topology is highly dynamic. Consequently, links between network nodes could be broken at anytime and communications from vehicle to vehicle could be corrupted. For this reason, a routing protocol independent of the network...
Research on vehicular ad hoc networks (VANETs) is active and ongoing. Proposed applications range from safety applications, and traffic efficiency applications to entertainment applications. Common to many applications is the need to disseminate possibly privacy-sensitive information, such as location and speed information, over larger distances. In-network aggregation is a promising technology that...
This paper presents performance and fairness analysis of the 802.11p Medium Access Control (MAC) in one-hop periodic broadcast V2V communication used in cooperative driving applications aimed for improving vehicle safety and traffic efficiency. We show that both performance and fairness strongly dependent on the random relative phasing (Φ0) of the vehicles and on the impact of Hidden Nodes (HNs).
Vehicle Ad Hoc Networks (VANETs), based on IEEE 802.11p, and 3G & beyond networks are characterized by their high date transmission rates and wide range communication, respectively. This paper presents an architecture that integrates between the two, making advantage of the features of each. Design guidelines pertaining to vehicle clustering and gateway management are defined. The former aims...
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