This paper proposes an efficient scheme for sharing location dependent data such as pictures of traffic accidents and congestion for assisting car drivers using vehicular ad hoc networks. Assuming that drivers request location-dependent data when they face a scene indicating an accident or they are caught in congestion, multiple requests will be sent from the same area to a location temporarily. If vehicles holding the demanded data item send it to each requester, the same data item is sent to the same area many times. Due to this, the communication resource is wasted by the same data item. We propose Live VANET CDN, a location-dependent data sharing scheme, in which vehicles disseminate copies of location-dependent data item within an area which is adjusted according to demand for the data item. Simulation results show that the proposed scheme improves the success ratio of data requests with small traffic compared with data dissemination schemes that use fixed data dissemination area.
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