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Energy-Efficient Relay Selection for RLNC Network-Coded Cooperative D2D Communication

Device-to-device (D2D) communication has been introduced as a promising technology for the 5th generation (5G) of cellular networks. It has been defined as a connection between two user equipments (UEs) without traversing the base station. In this paper, a heterogeneous macro-femtocell network is considered with the presence of D2D UEs. It has been shown that network coding in cooperative communication can enhance the quality of service (QoS) in wireless communications. In this paper, we consider the random linear network coding (RLNC) in cooperative D2D communication, where relay nodes are selected from the set of femtocell base stations (FBSs). Since energy efficiency is an important issue in wireless communications, our aim is to select efficient relay node that maximizes the energy efficiency of network-coded D2D communication by taking the minimum data rate constraint into account. Simulation results demonstrate that RLNC achieves the better efficiency in comparison with direct D2D.