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Although IEEE 802.11p technology is standardized for road safety and efficiency applications, the channel congestion problem is its key weakness necessitating distributed congestion control (DCC) algorithms on different layers of the communication stack. In this paper, we propose DCC-enabled Contention based Forwarding scheme targeting multi-hop dissemination of Decentralised Event Notification Messages...
Traditional vehicular routing protocols cannot accurately foresee future location of each vehicle for efficient packet forwarding. Recently, the data mining approach has been applied to analyze huge vehicle trajectory data. In this paper, we propose a novel trajectory-based routing (NTR) protocol to improve the packet replication efficiency of vehicles in the Vehicular Delay Tolerant Network (VDTN)...
Vehicular Ad Hoc Networks (VANET) have become one of the most important research areas for the successful and deployment of intelligent transportation system and the unmanned vehicle technologies. In VANET, Travel Prediction-based Data Forwarding (TPD) was proposed as one of novel data forwarding schemes based on road traffic statistics. However, the TPD could not guarantee good performance in the...
There are some shortcomings in the delay tolerant network (DTN) routing algorithm, such as low message delivery rate, low network efficiency and high cost in the satellite network. In order to solve the problem above, this paper proposes a limited copy algorithm MPWLC based on service probability. In MPWLC, not only is the number of copies limited, but the storage resources of the satellite are also...
An improved GPSR protocol based on stratification of traffic density is designed to get lower possibility to encounter local optimum in VANET. In the sparse region, every node maintains a list that recorded its multi-hop neighbor nodes, but in the dense region, every node just maintains its one-hop-neighbor nodes. Every node will change their strategy according to the change of the periphery traffic...
Packet routing is important for Vehicular Delay Tolerant Networks (VDTNs).Opportunistic routing algorithms based on historical records are insuciently accurate in forwarder selection due to movement randomness of vehicles. Trajectory-based routing algo- rithms tackle vehicle movement randomness but cannot be directly used in VDTNs due to the dependence on APs. In this paper, we develop a distributed...
Many broadcast protocols have been proposed in Vehicular ad-hoc Network (VANET) for safety applications and traffic efficiency. GeoBroadcast, which the sender sends information to the geographical area, has been standardized by the ETSI Technical Committee ITS. The routing protocol is a key technology satisfying communication requests of high reliability, low delay and universality for GeoBroadcast...
A number of applications of Intelligent Transportation Systems (ITS) rely on multi-hop broadcasting in order to disseminate useful traffic information to other vehicles located in a geographical area. However, the conventional broadcast mechanism may lead to the so-called broadcast storm problem, which causes a high level of contention, collision, and congestion due to an excessive number of broadcast...
The so-called Ring Road approach leverages low-cost LEO satellites and delay-tolerant networking (DTN) technologies to transfer data between different ground stations and, thus, renders cost-efficient worldwide communication possible. Applying DTN protocols to LEO satellite networks is a perfect fit. Nevertheless, there are central gaps in the state of the art in the context of this type of infrastructure:...
We first propose a framework which utilizes vehicular delay tolerant network (DTN) to form a vehicular cloud in order to provide information exchange without communication infrastructure. The framework does not rely on cellular network and therefore provides an approach which is suitable for post-disaster communication where cellular network is unavailable or severely congested. The paper also proposes...
Dynamic route planning is one of the ITS efficiency applications that reduce travel time and energy consumption. To perform efficient route planning, real-time traffic information should be collected and disseminated to vehicles on other road segments. vehicular ad-hoc networks (VANETs) are a promising technology that can provide the communication means to deliver the required traffic information...
Vehicular Ad Hoc Networks (VANETs) are going to be an important communication infrastructure in our moving life. The design of routing protocols in VANETs is a significant and necessary issue for supporting VANET-based applications. However, due to high mobility, frequent link disconnection, and uneven distribution of vehicles, it becomes quite challenging to establish a robust route for delivering...
Hybrid sensor and vehicular network (HSVAN) is a new and inexpensive technology that combines the features of wireless sensor network (WSN) with vehicular ad hoc network and (VANET). In HSVAN, sensor nodes' distribution is prearranged and deployed along with the roadsides and have centralized communication channel with sensor gateway that alert drivers from dangerous conditions. However, the network...
Vehicle Ad hoc Network (VANET) is an emerging technology and a new application of mobile Ad Hoc technology in the field of traffic. As the simulation experiments cost less manpower and material resources and they are easy to reproduce the same scenario, VANET simulation technology has become a focus of scholars. But node mobility is strictly limited in the realistic traffic environment and fast moving...
Vehicular ad hoc networks (VANET) have attracted considerable attentions in recent times for promising applications like vehicular safety, traffic monitoring, etc. Due to fast topological change and frequent network disruption, multihop data dissemination is an important issue. In this paper, we propose a greedy intersection-based optimal routing protocol, in which we formulate the data forwarding...
Geocast routing in vehicular ad-hoc networks has become an area of interest for researchers as it is an essential part of ITS (intelligent transport system). Many vehicular applications require geocast i.e. fast and reliable warning message dissemination to particular regions. Several proposed approaches, consider a geocast region as a circular area with a center point and a radius. However, in case...
Increasing generated data volume and the rare bandwidth resource make the data delivery through vehicle-to-vehicle (V2V) a preferred mode for vehicular networks. However, in the urban vehicular environment, the traffic density information collected by the densely deployed cameras along the road were not used efficiently on the design of the data delivery policy. In this paper, a strategy for the decision...
In our day to day life we witness an increase in population thereby a sudden increase of vehicles on roads causing major traffic jams and delays. There always exists an emergency situation where we require the movement of ambulances and fire engines to reach its destination on time. Due to bad traffic situations this event fails to happen. This paper proposes an automatic green channel facility during...
Cooperative driving and the associated need for vehicular communication motivate vehicular ad-hoc networks (VANETs). One major challenge is to provide for robust communication — in spite of highly dynamic topologies and the presence of shielding obstacles — without installing extra relay infrastructure. Traffic-density information and density estimation schemes are a valuable asset to approach this...
In the recent years, many solutions for Vehicle to Vehicle (V2V) communication were proposed to overcome failure problems (also known as ‘dead-ends’). This paper proposes a novel framework for V2V failure recovery using Device-to-Device (D2D) communications. Based on the unified Intelligent Transportation Systems (ITS) architecture, LTE-based D2D mechanisms can improve V2V ‘dead-ends’ failure recovery...
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