EMERGENCY WARNING MESSAGE BROADCASTING METHOD USING RANGE-BASED RELAY NODE SELECTING METHOD FOR VEHICULAR AD-HOC NETWORK

摘要

An emergency warning message broadcasting method using a range-based relay node is provided to minimize a message transmission time between terminals by assigning an optimum transmission delay time. An emergency warning message broadcasting method is comprised of the steps: relaying node candidate receives the EWM(Emergency Warning Message)(S2); it is determined whether the received message is the new EWM or not (S4); The location information of a primitive source node included in received EWM and location information of the previous relaying node are extracted, and the location information of the relaying node candidate is obtained through A GPS (S6); The distance between the primitive source node and the relaying node candidate and the distance between the relaying node and the relaying node candidate (S8); and It is determined whether the relaying node candidate is satisfied with the predetermined condition or not (S10).