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Vehicular networks have become among the most interesting topics in Internet of Things era as they are key factor in limiting road crashes and introducing a smart transportation system with high level of safety. The communication between vehicles and other devices is known as a Vehicle-to-Everything (V2X) and it is categorized into two main types: Vehicles-to-Infrastructure (V2I) and Vehicles-to-Vehicles (V2V). This paper considers vehicular networks based on 5G cellular network with a Device-to-Device (D2D) technology support. The main challenges here are to guarantee all V2V links reliability while maximizing both of ergodic capacity for those V2I ones and the overall network utilization. Furthermore, each channel should be shared between a V2I link and multiple V2V links. The paper proposes a sequence of procedures to solve the mentioned problem. First, an efficient power optimization mechanism is …