Modeling and analysis on double-tiered device-to-device communications in vehicle networks

In vehicle networks, how to implement V2V (vehicle-to-vehicle) communications is always one hot issue, because of the structure which is similar to D2D communications proposed by cellular networks, we try to achieve an efficient V2V communication model through D2D techniques. In this paper, we propose a double-tiered D2D communication mode with the ratio coefficient of interference distance. The Tier-I of mode accomplishes the pairing among D2D terminals based on Voronoi diagram, and the Tier-II of mode achieves the shared channel selections as many as possible. According to the description of hypergraph geometry structure to the double-tiered D2D pairing algorithm, and the algorithm is split into two sub-problems, which refer to both bipartite graph and Voronoi diagram match under the constraint of SINR. According to the convergence of match between ratio factors introduced in the double-tiered mode, the double-tiered mode can be proved to be an optimal mode of channel reusing. Finally, we perform computer simulations to verify the performance based on the double-tiered D2D communication mode, and results indicate that the proposed mode possesses better performance compared with the spectrum sharing D2D communication mode.