D2D Assisted Cellular Networks in Licensed and Unlicensed Spectrum: Matching-Iteration-Based Joint User Access and Resource Allocation

Device-to-Device (D2D) communications, which enable direct communication between nearby user devices over the licensed spectrum, have been considered a key technique to improve spectral efficiency and system throughput in cellular networks (CNs). However, limited spectrum resources cannot be sufficient support more users (CUs) D2D meet growth of traffic data future wireless networks. Therefore, Long-Term Evolution-Unlicensed (LTE-U) D2D-Unlicensed (D2D-U) technologies proposed further enhance capacity by extending CUs on unlicensed for communications. In this paper, we consider an LTE network where are allowed share with Wi-Fi users. To maximize sum rate all while guaranteeing each user’s quality service (QoS), jointly access resource allocation. tackle formulated problem, propose matching-iteration-based joint allocation algorithm. Simulation results show that algorithm can significantly compared other benchmark algorithms.