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Existing protocol | Strength | Weakness |
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IVG | (1) Mitigates broadcast storm problem (2) Efficient in fragmented network (3) Distributed algorithm | (1) Just functions in highway scenario (2) Requires accurate GPS information (3) Periodically rebroadcasts safety message |
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DRG | (1) Distributed algorithm (2) Mitigates broadcast storm problem | (1) Data dissemination may be slow because of ZoF (2) Mitigates network fragmentation periodically which causes high reception overhead |
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DV-CAST | (1) Distributed framework (2) Mitigates broadcast storm problem and network fragmentation in a single framework (3) Efficient for safety emergency applications | (1) Just functions in straight highways (2) Highly dependable on position and direction information of vehicles gathered from GPS |
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Mobicast | (1) Mitigates broadcast storm problem (2) Efficient in fragmented network | (1) Just functions in highway scenario (2) Complicated mechanism to select vehicles in Zof and ZoR |
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SRD | (1) Simplicity (2) Mitigates broadcast storm problem and fragmented network problem simultaneously | (1) Just functions in highway scenario (2) Not reliable for safety messages |
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EAEP | (1) No beacon exchange (2) Mitigates broadcast storm problem | (1) Just functions in highway scenario (2) Assumes end to end connection between vehicles |
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UV-CAST | (1) Mitigates broadcast storm problem and network fragmentation (2) Considers two different levels for communication range which is more realistic assumption | (1) High complexity because of gift-wrapping algorithm (2) Just functions in urban scenario (3) Assigns task of store carry forward to different vehicles |
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EDB | Receiver based decision | (1) Just functions in highway scenario (2) Fixed antenna direction with beam width of about 30 degree |
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Streetcast | By utilizing digital map, streetcast is a fast and accurate broadcast protocol | No specific method for fragmented network condition |
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POCA | (1) Eliminates broadcast storm problem and network fragmentation (2) Functions in different network scenarios such as highway and urban | (1) Utilizes 2-hop neighbor information (2) Very high reception overhead |
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DECA | (1) Functions in different network scenarios such as highway and urban (2) Mitigates broadcast storm problem and network fragmentation problem | (1) Selects relay vehicle based on random waiting time (2) Requires knowledge of 2-hop neighbors. |
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Ack-PBSM | Functions in different network scenarios such as highway and urban | (1) Data dissemination speed may be slow because of using CDs (2) Not efficient for safety emergency messages |
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