An Efficient Flooding Scheme for V2V Communications Considering Intersections of Urban Area

摘要

In Vehicle-to-Vehicle (V2V) communications, broadcast is expected to disseminate information to locations beyond the transmission range of individual nodes. However, due to shadowing of buildings in urban area, the V2V communications at an intersection is unreliable. Thus it is difficult to disseminate information to all directions at an intersection. In addition, most of existing protocols need to use digital map which is costly and hard to update frequently. In this paper, we proposed an efficient flooding scheme for V2V communications in urban environment without digital map. We identify intersection by the difference of theoretical RSSI (Received Signal Strength Indicator) value and real RSSI value. The larger difference means larger shadowing of obstacles. We give the higher precedence to the vehicles in different street and the vehicles in further distance to sender. Simulation results show that this scheme achieves a higher reception ratio and a shorter delivery time than existing broadcast protocols.