Performance of a cooperative-bloom filter-assisted query protocol for data access in Bangkok scenario

Vehicular ad hoc network (VANET) is challenging to deliver a query message for a requesting data efficiently when the topology of network keeps changing frequently and has many partitions. Many routing algorithms suffer from path breaks. Our work focuses on communication between vehicles to roadside unit stations by requesting data only one-hop communication from the requesting node. Routing algorithms are not needed to create data transfer path. We present a cooperative-bloom filter-assisted query protocol for data access in VANET, COBRA-Q. The COBRA-Q utilizes the movement of vehicles to achieve transfer of the request data within one-hop communication. The COBRA-Q uses bloom filter technique to keep and compress car traveling history records. In this paper, we evaluate the performance of our proposed protocol by simulation in ns-3. The real vehicle density and the real urban area in Bangkok are used. 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.