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Recently, vehicular networks have begun to attract much attention in industry as well as academia. In particular, IEEE 802.11-based solutions for vehicular networks are also investigated by IEEE 802.11p. As the original IEEE 802.11 standard is designed only for little mobility, the IEEE 802.11p working group should address important issues such as frequent disconnection and handoff. We first introduce...
A vehicular ad hoc network (VANET) is a high mobility wireless ad hoc network that is targeted to support vehicular safety, traffic monitoring, and other commercial applications. Mobility models used in traditional mobile ad hoc networks cannot be directly applied to VANETs since real world factors such as road layouts and traffic regulations are not considered. In this paper, we propose a vehicular...
We propose a novel group signature based security framework for vehicular communications. Compared to the traditional digital signature scheme, the new scheme achieves authenticity, data integrity, anonymity, and accountability at the same time. Furthermore, we describe a scalable role-based access control approach for vehicular networks. Finally, we present a probabilistic signature verification...
Content sharing using cooperative peer-to-peer model has become increasingly more popular in a vehicular ad hoc network (VANET). The small transmission window from a vehicle to an access point (AP), high mobility of vehicles, and intermittent and short-lived connectivity to an AP provide incentives for vehicles to cooperate with one another to obtain information from the Internet. These characteristics...
This paper addresses the problem of real-time video transmission in vehicular networks. We show that the video quality of real-time services is greatly decreased when there is network congestion in different traffic situations. We propose a solution that applies frame skipping and transcoding together with frame rate reduction techniques over IEEE 802.11 based vehicular networks. Our approach improves...
The paper proposes a MAC layer protocol called QoMOR (QoS-aware MAC protocol using optimal retransmission) that is designed to provide QoS in a decentralized network with multiple sensor (source) nodes that do not have the capability to receive acknowledgements from the sink node. A minimum data delivery probability between the sensor and sink nodes is achieved by allowing each source node to transmit...
Secure communication of time critical information in V2V networks is expected to be achieved via a robust infrastructure that provides security related services at all times. This paper explores the dependence of performance of secure V2V communications on the mechanisms used by the security infrastructure. We propose and analyze a performance metric termed the confidence on security infrastructure...
Unmanned aerial vehicle (UAV)-aided wireless ad- hoc networks have become an important component of today's battleground. This paper considers the dynamic spectrum management problem in a single-theater UAV-aided ad-hoc wireless network. We propose spectrum management and rate allocation algorithms in a multi-rate, multi-channel UAV-aided ad hoc wireless network that uses link adaptation. We also...
Simulation of network protocol behavior in Vehicular Ad Hoc Network (VANET) scenarios is the predominant basis for evaluating the applicability of particular protocols developed in the Mobile Ad Hoc Network (MANET) domain. As the selection of a mobility model influences the outcome of simulations to a great deal, the use of a representative model is necessary for producing meaningful evaluation results...
In this paper we propose a relay-based solution to extend the service range of roadside APs. When a vehicle moves towards the AP, its signal quality to the AP may be poor. At this time, it uses a relay vehicle ahead of it which has good signal quality, to relay the data. When the vehicle is moving away from the AP, it uses a relay node behind it to set up a backward relay path to keep the connection...
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