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Black-Burst-Based Multihop Broadcast Protocols for Vehicular Networks Gökhan Korkmaz, Eylem Ekici, and Füsun Özgüner Member, IEEE IEEE TVT 2007
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Outline Introduction 1 Directional Broadcast 2 Intersection Broadcast 3 4 Performance Evaluation 5 Conclusion 4
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Introduction In Intervehicular Communication (IVC) systems, broadcast is a frequently used method. Possible applications relying on broadcast include sharing emergency traffic weather road data among vehicles delivering advertisements announcements
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Introduction These applications generate packets of various lengths at different rates. accident warnings are short packets that are generated infrequently warning packets reporting slippery road conditions are generally short advertisement packets can be broadcast in very long packets that carry pictures, directions, or even short videos
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Related Work Source Destination A B C D
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Goal Design a special MAC layer for efficient and reliable multihop message dissemination in VANETs address the broadcast storm, hidden node, and reliability problems of multihop broadcast in vehicular networks.
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Directional Broadcast Request to Broadcast (RTB) Packet Intended Broadcast Direction Source A B C Black-burst signal
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Directional Broadcast Request to Broadcast (RTB) Packet Intended Broadcast Direction Source A B C Black-burst signal
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1 Duration of the Black-burst L 1 : black-burst duration in the first iteration d : the distance between the source and the vehicle R : the transmission range N max : number of segments created SlotTime : length of one slot 02
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Duration of the Black-burst Source 10
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Duration of the Black-burst Source
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Duration of the Black-burst Source
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Intersection Broadcast Urban Multihop Broadcast (UMB) Obstacle Vehicle Infrastructure
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Intersection Broadcast Ad hoc Multihop Broadcast (AMB) Vehicle B A C D E F Hunter Vehicle
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Performance Evaluation Success Probability Comparison
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Performance Evaluation Successful Packet Delivery Percentage
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Performance Evaluation Packet Dissemination Speed
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Conclusion Two position-based multihop broadcast protocols for IVC networks have been proposed The UMB protocol employs repeaters installed at the intersections. AMB is an extension of the UMB protocol with a fully ad hoc intersection broadcast mechanism. Design a special MAC layer for efficient and reliable multihop message dissemination in VANETs address the broadcast storm, hidden node, and reliability problems of multihop broadcast in vehicular networks.
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