Cobra-Q: A cooperative-bloom filter-assisted query protocol for data access in VANET

Vehicular ad hoc network (VANET) is one type of wireless networks that uses moving vehicles as nodes in the network. In vehicular networks, it is challenging to transfer a query message for a requesting data efficiently when the destination node is out of transmission range from the requestor node. This is because many routing algorithms suffer from frequent path breaks when the vehicles are moving. In this paper, we focus on communication between vehicles to roadside unit stations by requesting data only one-hop communication from the requesting node and does not need to use any routing algorithms to create data transfer path. We present a novel query protocol for data access in VANET called COBRA-Q. The COBRA-Q can work on moving vehicles and achieves to transfer the request data within one-hop communication. The COBRA-Q uses bloom filter technique to keep and compress car traveling history records. We evaluate the performance of our proposed protocol by simulation in ns-3 with urban and highway scenario. The simulation results show that the COBRA-Q can effectively access data in terms of percentage of success rate and overhead of using query message.