Optimal Power Allocation for a D۲D-assisted Vehicularcommunication

In intelligent transport system (ITS) networks, it is very useful to reduce the transmission energy consumption.Device-to-device (D۲D) communication is a key technology that can improve the performance of the ITS networks. Inthis paper, we investigate a D۲D-enabled vehicular network and study a power allocation strategy to maximize thespectral efficiency of the network. Also, for safety-critical vehicle-to-vehicle (V۲V) and vehicle-to-infrastructure (V۲I)applications, it is presented a reliable connection during the V۲V and V۲I links. The performance analysis of theinvestigated network shows that the studied method can maximize the total spectral efficiency of the network subject tosatisfy some constraints when the channel state information (CSI) is perfectly known or not.