Position-freshness based intermediate node filtering for VANET

Inter-vehicle communication has challenges caused by characteristics of vehicle. High mobility of the vehicle induce change of network topology. Many routing protocols has been proposed to address high mobility. Among them, position based routing (PBR) protocols are getting attentions as a suited method. In PBR, forwarding node select intermediate nodes based on neighbor node's position information. Since PBR can reduce end-to-end delay by transmit packets without route establish, getting attentions as a suitable routing protocol for inter-vehicle communication. However, inaccuracies of the position information and disturbance of transmission by obstacles decreases the reliability of the packet delivery. In this paper, we propose filtering method of candidate nodes based on position information freshness. By filtering untrusted nodes, proposed method can improve reliability of transmission in urban environment.