Social-Aware Energy-Efficient Joint Mode Selection and Link Allocation in D2D Communications

Joint mode selection and link allocation for Device-to-Device (D2D) communications underlaying cellular networks are essential to improve users' energy efficiency. Meanwhile, mobile terminals are held by human beings, who may formulate social relationships to enhance users' cooperation in spectrum resource sharing. In this work, a novel optimization framework based on coalition formation game theory is proposed to solve the social-aware energy-efficient resource sharing problem in D2D communications. Specifically, we analyze users' energy efficiency under different communication modes. Moreover, the impact factors of social relationship are modelled as negative exponential functions. Then, this resource sharing problem is solved by the non-transferable utility coalition formation game. Finally, we develop a decentralized algorithm to acquire the joint strategy on mode selection and link allocation of potential D2D pairs. Simulation results show that our proposed social-aware scheme can improve the traffic offloading of the BS better than that Under social -unaware scenario.