An Inter-Vehicle Geocasting Algorithm for Vehicular Cooperative Collision Warning System using DSRC

This paper presents an inter-vehicle geocasting and collision warning algorithm to accomplish multihop and collision avoidance in cooperative driving and data exchanged based on GPS positioning and dedicated short range communication (DSRC). The concept of cooperative collision warning (CCW) system provides warning or situation awareness to drivers based on broadcast messaging the motions of neighboring vehicles obtained by one-way communication from other vehicles. The proposed system has the advantage of omnidirectional transmitting/receiving functions of DSRC module that provides 360-degree coverage in own surveillance region. The scenario of CCW system is mainly applied on group trips; moreover, the developed algorithm has the ability of message broadcasting and collision point estimation. This article concerns message geocasting and collision warning in inter-vehicle communication. Indeed, each CCW system can show other vehicles on the geographical map, and furthermore the developed inter-vehicle geocasting algorithm is the key point in remote surveillance, while some vehicles move away or turn into the roadway or intersection. The development system integrates DSRC and GPS with embedded system into CCW system. From the positioning data and vehicular information, this paper provides a conflict detection algorithm to do time separation and remote warning with error bubble consideration. The proposed system is carried out with theoretical application and hardware integration, and the result shows cooperative driving approach applicability using vector geocasting method. Some experiments are also scheduled about packet loss and latency by static tests, in which vehicles stop in fixed position away from 0 to 200 m.