Power Control and Mode Selection Algorithm for D2D Communications

In this paper, we present a distance and interference based decision-making framework for device-to-device (D2D) communication mode selection (choosing one mode among dedicated mode, reuse mode, and cellular mode) and a power control approach for multiple D2D pairs underlaying cellular network. The proposed approach is based on the location of D2D users. If orthogonal resources are available and the D2D pair is close to each other, then the D2D dedicated mode is preferred. Otherwise, reuse (uplink or downlink) mode is utilized where interference is a prime concern. Reuse mode of D2D communication with allowable interference allows more users to be served with efficient spectrum utilization. Moreover, the power control approach is introduced to avoid the wastage of power and to reduce the impact of interference. Numerical results are provided to validate the significance of the proposed approach.