Resource Allocation in Underlay Network with User Diversity

Device-to-Device (D2D) communication can enhance the spectrum utilization rate by multiplexing downlink resources in a 5G cellular network. However, it also introduces interference. We formulate an optimization problem with the objective of optimizing the transmission total rate of the celluar users (CUs) and D2D pairs while meeting the minimum necessary rate of cellular users and D2D pairs. We approach this issue by optimizing the transmitted beamforming, and power allocation jointly. The problem is decoupled into two subproblems. To achieve the optimization objective, a RPSO (Revised Particle Swarm Optimization Algorithm) in section beamforming optimization is formulated, and in the power allocation step the companion matrix is utilized to determine the optimal power allocation. The simulation demonstrates that the suggested approach successfully increased both the sum rate and connection rate while maintaining quality of service (QoS).

I. Introduction

As the requirement for local data transfer has grown, Device-to-Device (D2D) communication has gained promi-nence as an important part of cellular networks [1]. D2D can boost spectrum efficiency by recycling spectrum resources and lengthen device service life by reducing transmission power [2]. Due to resource sharing, interference coordination is a major difficulty for communication with user diversity including both D2D users and celluar users (CUs) [3], [4], and interference management between D2D and cellular communication affects network speed and reliability.