Enhancing IEEE 802.11p/WAVE to provide infotainment applications in VANETs.
ABSTRACT IEEE 802.11p/WAVE (Wireless Access for Vehicular Environment) is the emerging standard to enable wireless access in the vehicular environment. Most of the research contributions in this area has focused on safety-related applications, while comfort and information/entertainment applications (such as on board Internet access, point-of-interest notification, e-map download) have been considered only recently. Notwithstanding, the user interest in this kind of applications is expected to become a big market driver in a near future. In this paper, an extension to IEEE 802.11p is proposed that is compliant with the multi-channel operation of the WAVE architecture and targets at the support of non-safety applications, while preserving the delivery of safety services. The proposed W-HCF (WAVE-based Hybrid Coordination Function) protocol leverages controlled access capabilities on top of the basic contention-based access of the IEEE 802.11p; it exploits vehicles’ position information and coordination among WAVE providers in order to improve performances of delay-constrained and loss-sensitive non-safety applications.
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ABSTRACT: Vehicular Ad hoc network (VANET) has recently been attracting the attention of researchers as a new technology in the wireless communication system. Vehicle-to-vehicle V2V communication can be considered an important way to help the drivers to satisfy requirements such as less congestion, accident warning, road exploration, etc. The propagation issues such as multipath fading significantly affect the reliability of V2V communication. The goal of this work is to enhance the performance of the physical layer PHY in V2V communication. However, the cellular phone channel has been used to evaluate the possibility of apply it in the vehicular communication V2V. The simulation results observed that the transmitted signal is affected by a multipath fading channel. In order to overcome this problem two techniques are used: Orthogonal Frequency Division Multiplexing (OFDM) technique and Multiple-Input-Multiple-Output (MIMO) diversity technique. The simulation results showed that the OFDM technique overcomes the multipath fading with high transmission power. On the other hand, MIMO diversity technique called Alamouti Space-Time Code for two transmitters and two receivers (MIMO 2x2) is used to improve the error degradation with less transmission power.The 14th Annual PostGraduate Symposium on The Convergence of Telecommunications, Networking and Broadcasting (PGNET 2013); 06/2013
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ABSTRACT: Given the bandwidth assignment for dedicated short range communications for use in vehicular ad-hoc network (VANET) and the expected introduction of equipment in the next few years, we elaborate on how VANET can support infotainment services. We define an architectural model for the integration of VANETs and cellular networks, according to a push mode paradigm where VANETs are used primarily to disseminate service announcements and general interest messages. Cooperation with cellular network is addressed by comparing architecture alternatives. A set of information dissemination protocols for VANETs is compared via simulations on a real urban map. Some results from a lab testbed based on IEEE 802.11p boards are presented along with an application developed for Android operating system to demonstrate the concept of the paper.Journal of Communications and Networks 04/2013; 15(2):179-190. DOI:10.1109/JCN.2013.000031 · 0.75 Impact Factor
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ABSTRACT: Vehicular Ad hoc Networks (VANET) have emerged as a subset of the Mobile Ad hoc Network (MANET) application; it is considered to be a substantial approach to the Intelligent Transportation System (ITS). VANETs were introduced to support drivers and improve safety issues and driving comfort, as a step towards constructing a safer, cleaner and more intelligent environment. At the present time, vehicles are exposed to many security threats. One of them is the User Datagram Protocol (UDP)- based flooding which is a common form of Denial of Service (DoS) attacks, in which a malicious node forges a large number of fake identities, i.e.-, Internet Protocol (IP) spoofing addresses in order to disrupt the proper functions of the fair data transfer between two fast moving vehicles. Incorporating IP spoofing in the DoS attacks makes it even more difficult to defend against such attacks. In this paper, an efficient method is proposed to detect and defend against UDP flooding attacks under different IP spoofing types. The method makes use of a storage-efficient data structure and a Bloom filter based IPCHOCKREFERENCE detection method. This lightweight approach makes it relatively easy to deploy as its resource requirement is reasonably low. Simulation results consistently showed that the method is both efficient and effective in defending against UDP flooding attacks under different IP spoofing types. Specifically, the method outperformed others in achieving a higher detection rate yet with lower storage and computational costs.Advance Computing Conference (IACC), 2013 IEEE 3rd International; 01/2013