Dynamic power control based on FFR for D2D communication underlaying cellular networks

By reuse the resource of existing cellular users, D2D (Device-to-Device) communication underlaying cellular network can improve the spectrum utilization rate and reduce the power consumption of mobile terminals. However, it will also bring interference to the existing cellular network. How to effectively restrain the interference caused by resource reuse has become the most important factor that affects the performance of multi-cell networks. In order to ensure the quality of service of D2D users and cellular users, this paper studies the power control and resource allocation scheme for D2D communication underlaying cellular communications. Specifically, based on multi-cell cellular network architecture, fractional frequency reuse is introduced to achieve resource partitioning and resource reuse between cellular users and D2D users. Based on the principle of maximizing the throughput of the whole system, the optimization objective is then established. Combined with the fractional power control and with the introduction of interference limits, we use the Lagrangian dual decomposition to solve the optimization objectives, and propose a dynamic power control strategy. Simulation results show that compared with the existing algorithms, the proposed scheme improves the performance of the overall system.