We propose to use Vehicular ad hoc networks (VANET) as the infrastructure foran urban cyber-physical system for gathering up-to-date data about a city, liketraffic conditions or environmental parameters. In this context, it is criticalto design a data collection protocol that enables retrieving the data from thevehicles in almost real-time in an efficient way for urban scenarios. We propose Back off-based Per-hop Forwarding (BPF), a broadcast-basedreceiver-oriented protocol that uses the destination location information toselect the forwarding order among the nodes receiving the packet. BFP does notrequire nodes to exchange periodic messages with their neighbors communicatingtheir locations to keep a low management message overhead. It uses geographicinformation about the final destination node in the header of each data packetto route it in a hop-by-hop basis. It takes advantage of redundant forwardingto increase packet delivery to a destination, what is more critical in an urbanscenario than in a highway, where the road topology does not represent achallenge for forwarding. We evaluate the performance of the BPF protocol using ns-3 and a Manhattangrid topology and compare it with well-known broadcast suppression techniques.Our results show that BPF achieves significantly higher packet delivery ratesat a reduced redundancy cost.
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