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VANETs are a kind of adhoc wireless network, which is characterised as restricted topology patterns, node mobility and dynamic in nature. Vehicles communicate with each other via Vehicle-to-Vehicle (V-to-V), Vehicle to roadside unit (RSU) and RSU to Base-Station. Every vehicle is equiped with on board unit (OBU) that helps to communicate with RSU and Base-Station. Routing is very important in communication...
Video is the most recommended media for information dissemination in VANETs (Vehicular Adhoc Networks) as it gives clear and quick understanding of information to the drivers. The real time and on-demand video helps vehicles on road in various possible ways. An improper provider not only leads to frequent interruptions of communications, but the transmission of the invalid video fragments would also...
A multi hop vehicular ad hoc network is a peer to peer network of wireless nodes where nodes are required to perform routing activity to provide end to end connectivity among nodes. As vehicles are constrained by bandwidth, some vehicles may behave selfishly and deny forwarding packets for other nodes, even though they expect other nodes to forward packets to keep network connected. We simulate forwarding...
In this paper, we investigate the performance of HWMP, OLSR and DD protocols in a VANET crossroad scenario. The mobility patterns of vehicles are generated by means of SUMO (Simulation of Urban Mobility) and as communication protocol simulator is used NS3 (Network Simulator 3). For the simulations, we used IEEE 802.11p standard, Two Ray Ground Propagation Loss Model and sent multiple CBR flows over...
In this paper, a two purpose structure to simultaneously determine the shortest travel time path for a moving vehicle and efficient packet dissemination for traffic information messages has been presented. In order to reduce traveling time, vehicles are directed to the paths with lower density. Given that, such paths have a higher risk in radio coverage partitioning; it is more likely to reduce successful...
Vehicular Ad-hoc Networks (VANET) is mainly discussed todeploy of ITS (Intelligent Transportation Systems) analysis and design solutions for safety, security and road traffic monitoring with better management. Through the vehicle information exchange to vehicles, road side units (RSU) and infrastructure nodes, Traffic Monitoring Center (TMC) can support incident detection monitoring and management...
Given the resource consumption of transmitting data packets in Vehicular Ad Hoc Network (VANET), selfish nodes might refuse to transmit messages to others just for maximizing their own profits. Therefore, the communication performance within the whole network would be affected. Along with its wide-scale implementation in many road-side applications, selfish behaviors of such nodes are witnessed to...
In this work, we present a analytical hierarchy process (AHP) for computing trust in the vehicular ad hoc networks (VANETs). AHP based trust management provides a lightweight security alternative to existing security techniques. Trust Management in VANETs is required to broadcast of selfish or malicious messages and also enable other vehicles to filter out such messages. A trust management system...
Mobile Ad Hoc Networks (MANETs) have several features, such as dynamic topologies, limited bandwidth usage, limited energy, etc… Vehicular ad hoc networks (VANETs) are a special case of mobile ad hoc networks. VANET communication can be formed between vehicles with vehicle to vehicle (V2V) communication or between Vehicle-to-Road Side Units (V2R). VANETs provides a promising network scenario for facilitating...
Vehicular ad hoc networks (VANETs) are expected to support a large spectrum of mobile distributed applications ranging from traffic alert dissemination and dynamic route planning to context-aware advertisement and file sharing. Internetworking over VANETs becomes one of the most important applications and desired service for mobile users. In current ad-hoc routing protocols, the control messages in...
Information interaction is a crucial part of modern transportation activities. In this paper, we propose the idea of Vehicle-to-Passenger communication (V2P), which allows direct, instant, and flexible communication between moving vehicles and roadside passengers. With pocket wireless devices, passengers can easily join VANETs as roadside nodes, and express their travel demands, e.g., taking a free...
The main goal of Vehicular Ad-Hoc NETworks (VANETs) is to improve safety, efficiency and comfort in everyday road travel. The communication quality in these networks is highly degraded when the number of vehicles is very large in a small geographic area or when vehicles do not cooperate in packet forwarding. Groups are here proposed to avoid these problems by decreasing the number of packets sent...
Vehicular ad-hoc networks (VANETs) is a promising approach to the dissemination of spatio-temporal information such as the current traffic condition of a road segment or the availability of a parking space. Due to the constraint of the communication bandwidth, only a limited number of information items may be transmitted upon a vehicle-to-vehicle communication opportunity. Ranking becomes critical...
Multimedia exchange within a Vehicular Ad Hoc Network (VANET) may be facilitated by exploiting the peer-to-peer (P2P) paradigm. Urban VANETs are characterized by restricted vehicle mobility, driver actions, and bunching at obstacles, leading to wireless interference and broken links. Similarly P2P communication relies on distributed sources which are intermittently available. However, routing packets...
This paper introduces P2P communication across a VANET and seeks to establish under what conditions (mobility, network size, wireless channel) data streaming is feasible. Routing of streamed services over multiple hops and multiple paths may result in significant packet losses, resulting in unacceptable quality of service. This paper examines the impact of differing traffic densities and different...
Peer-to-peer systems in vehicular ad hoc networks are the scope of intensive research in last few years. Several proposed content sharing systems in the literature are based on a hybrid infrastructure containing static gateways that manage the file sharing between the vehicles. In this paper, we present CoFFee, a Cooperative and inFrastructure-Free peer-to-peer system, where the network do not rely...
Content sharing through vehicle-to-vehicle communication can help people find their interested content on the road. In VANETs, due to limited contact duration and unreliable wireless connection, a vehicle can get the useful data only when it meets another vehicle and the encountered vehicle has the exactly matched data. However, the probability of such case is very low. To improve the performance...
Due to the vehicle's movement and inherent characteristics of wireless channel, how to discover and retrieve the required contents has become a challenging issue in a hybrid network including vehicular ad hoc networks (VANETs) and the Internet. In this paper, we propose a social cluster-based P2P framework that estimates similarity and connection condition among peers to provide mobile peers efficient...
Vehicular networks create a new communication paradigm that enables to exploit the movement of cars to disseminate content. If network coding is used, vehicles have much more flexibility in content sharing and the system stability and scalability are promoted also in presence of mobility. Along this line, we propose an efficient mechanism to provide secrecy of the information. Traditional approaches...
Communication and content sharing between cars has become one of the most interesting services for mobile users. Nevertheless, most efforts in this research field still is focused on direct opportunistic meetings between cars, which may result in poor performance. In this paper, we present a global architecture for vehicular ad hoc networks (VANET) that overcomes the intermittent nature of connectivity...
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