Transmitting power control method with energy efficiency optimization guaranteeing service quality based on Brent method in D2D (Device-to-device) communication

A transmitting power control method with an energy efficiency optimization guaranteeing service quality based on a Brent method in a D2D (Device-to-device) communication comprises the following steps: (1) achieving an objective of energy efficiency optimization of a D2D communication user on the premise of guaranteeing the service quality by controlling transmitting power of the D2D communication user and a cellular network user and modeling the issue accordingly, (2) equivalently converting an optimization issue P1 related to control of the transmitting power of the D2D communication user and the cellular network user to an optimization issue P2 only related to the transmitting power of the D2D communication by a method of introducing an auxiliary variable, and (3) converting the optimization issue P2 into an optimization issue P3 via analysis, and solving the optimization issue P3 by using a golden ratio search and quadratic interpolation algorithm. The method considers power consumption of a basic circuit of a transmitter, optimizes use efficiency of user energy and increases a resource utilization rate.