2018 Volume 7 Issue 10 Pages 376-381
Crash Warning Application (CWA) for vehicle safety is expected one of the most important applications in smart city. CWA exchanges status information between all nodes by broadcast frames in V2X (Vehicle-to-Everything) communications. Since CWA has some QoS requirements, the number of nodes such as vehicles and pedestrians must be less than a certain value to avoid congestion. In order to accommodate more communication nodes in CWA, a novel cluster-based communication method is proposed. In this method, a cluster head estimates its members’ status and transmit them on behalf of the members instead of collecting members’ information with using additional spectrums. Members transmit correction frames if they hear unacceptable error in the estimation. Depending on the error value, congestion level is to decrease in frames simultaneously sent by cluster head but to increase in additional frames for the error correction. The proposed method is evaluated to show its effectiveness for the number of cluster members and error values (error probabilities).