Route Discovery Technique
The RREQ frames are broadcast by the VRR Broadcasting algorithm. If a node doesn't have a route to destination then the node rebroadcasts depend on the algorithm. If a node has a route to destination, it creates broadcast frame RREP and set up backoff time depend on mobility behaviour (distance from a transmitter, speed and vector of motion). If a RREP is transmitted by a transmitter, all neighbour's nodes received also the RREP and they discards own RREQ or RREP effort except node which is on a way to a source node. Principle of VRR Route Discovery handshake (without MPRs) (animation)
Read more about this topic: Vehicular Reactive Routing Protocol
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