QoS Guarantees in NOMA-based Wireless Powered Mobile Communications

A Non-Orthogonal Multiple Access (NOMA)-based Wireless Powered Communication Network (WPMC) system is studied in this work where, at each time frame, an access point firstly performs Wireless Power Transfer (WPT) to energize the battery of mobile terminals (phase 1) and then, receives information from terminals in uplink by employing NOMA (phase 2).We formulate the total data rate maximization problem with Quality of Service (QoS) guarantees where the Successive Interference Cancellation (SIC) decoding order and phase 1/phase 2 time duration are optimized. Our main contributions are the assumption of more realistic aspects in the system modeling compared to prior art as well as the proposal of optimum and heuristic solutions to the aforementioned problem. According to our simulation results, one of our proposed heuristic presents quasi-optimum performance at the cost of a lower increase in computational complexity.