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- 저자 : Kashif Naseer Qureshi (검색결과 2 건)
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OBPF: Opportunistic Beaconless Packet Forwarding Strategy for Vehicular Ad Hoc Networks
( Kashif Naseer Qureshi ),( Abdul Hanan Abdullah ),( Jaime Lloret ),( Ayman Altameem ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.5
In a vehicular ad hoc network, the communication links are unsteady due to the rapidly changing topology, high mobility and traffic density in the urban environment. Most of the existing geographical routing protocols rely on the continuous transmission of beacon messages to update the neighbors` presence, leading to network congestion. Source-based approaches have been proven to be inefficient in the inherently unstable network. To this end, we propose an opportunistic beaconless packet forwarding approach based on a modified handshake mechanism for the urban vehicular environment. The protocol acts differently between intersections and at the intersection to find the next forwarder node toward the destination. The modified handshake mechanism contains link quality, forward progress and directional greedy metrics to determine the best relay node in the network. After designing the protocol, we compared its performance with existing routing protocols. The simulation results show the superior performance of the proposed protocol in terms of packet delay and data delivery ratio in realistic wireless channel conditions.
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Localization-Based System Challenges in Vehicular Ad Hoc Networks: Survey
Kashif Naseer Qureshi,Abdul Hanan Abdullah 한국산학기술학회 2014 SmartCR Vol.4 No.6
The vehicular ad hoc network is an emerging technology providing quick and cost-efficient communications in the automobile industry and great applications providing safety, driver assistance and comfort. Real-time information about a vehicle node’s position is based on assumptions acquired from various protocols and applications. One of the most popular technologies, the global positioning system (GPS), has been installed in vehicles to provide reasonable assumptions. A vehicular network depends on localization systems showing vehicle movement in critical areas. GPS systems have faced undesirable issues, such as information not always being available and not being robust enough for some applications. Different types of localization methods have been proposed, such as image/video localization, cellular localization and dead reckoning, to overcome GPS limitations. Data fusion for vehicle positioning is an emerging solution for robust and accurate techniques to replace previous techniques. In this paper, our discussion is based on localization requirements, localization applications and techniques, and the issues for vehicular ad hoc networks. Furthermore, we discuss how these localization techniques and data fusion are combined and used in safety applications to enhance network performance.
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