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CAESAR: an urban location service for VANETs

VANETs are networks where hosts are vehicles equipped with wireless transmission devices able to communicate without the need of any infrastructure. In this kind of network, routing algorithms are position aware, that is, they use geographical information to deliver packets, as in [1] and [2]. Each node periodically sends a broadcast packet, called beacon, which contains its unique identifier and its current location coordinates, obtained through a positioning service (e.g. GPS system). Every node receiving the beacon collects ids and coordinates of its neighbors (nodes in radio range) in its neighbor table. When a source node, let us say S, needs to communicate with a destination node, called D, it first retrieves D's location using a location service. Then S forwards packets to the neighbor that has smallest distance to D. This local strategy will be repeated by intermediate forwarding nodes until packets reach destination D. These algorithms are very efficient, but need a well-organized location service. Goal of this work is proposing a novel mechanism for this kind of service.