Energy efficiency resource allocation for cell-edge users with social-aware based grouping D2D

Abstract

With the emergence and popularization of multi-homing intelligent terminals, multi-receiver D2D communication has become a hot research issue. Based on the characteristic that D2D communication can work in licensed and unlicensed spectrum, a new grouping D2D (GD2D) model contains two transmitters (one works in the licensed spectrum and the other works in the unlicensed spectrum) and one receiver is constructed in this paper. To improve the user’s quality-of-service (QoS) at the edge of the cell, we develop a novel relay selection scheme based on a social tie that considers both physical and social constraints. Furthermore, we formulate a resource allocation problem that aims to maximize the system’s energy efficiency (EE). We derive the optimal closed solutions of the expressions by the fractional programming method and the Lagrangian dual approach. Numerical results show that the proposed grouping D2D scheme can yield significant EE performance gain over the traditional cell-edge user scheme.

Keywords

• Energy efficiency
• Cell-edge users
• Social-aware
• Grouping D2D