Relay selection in V2V communications based on 3-D geometrical Channel modeling

In this paper, an opportunistic relay selection policy related to the propagation characteristics for a vehicle-to-vehicle (V2V) relay-based system is presented, where a source communicates with a destination through multiple vehicle relay nodes. As Channel State Information (CSI) overhead is introduced by the relay selection process, reactive relaying is exploiting based on instantaneous CSI knowledge. To accurately characterize the corresponding wireless fading channel, a three-dimensional (3-D) model for V2V relay-based channels is initially constructed. From this model, a statistical sum-of-sinusoids (SoS) based simulation model is also developed, under 3-D non-isotropic scattering. The simulation results depict the throughput and the Packet Error Rate (PER) performance of the proposed relay selection scheme for different scattering conditions.