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Hybrid Routing Scheme Combining with Geo-Routing and DTN in VANET

Vehicular Ad hoc Network (VANET), a subclass of mobile ad hoc networks (MANETs), is a promising approach for the intelligent transportation system (ITS). One of the challenges of VANET is unstable channel with high mobility, and a communication interruption due to a dead end. In order to improve the packet delivery rate and suppress the communication traffic, SRS method was proposed. In SRS, a route for packet forwarding is calculated using the road map and the disconnected route is recovered dynamically. However, there is a problem that sufficient packet delivery rate is not obtained in the SRS in the low vehicle density environments. In this study, we propose a routing method for improving the delivery rate of the packets by using the road information such as traffic volume. Also, if the packet is not delivered in multiple re-route searches, DTN (Delay tolerant networks) algorithm is used to improve the delivery rate. To confirm the effectiveness of the proposed method, simulation is conducted to evaluate a packet delivery rate.