Throughput Maximization of Hybrid Full-Duplex/Half-Duplex Relay Networks with Energy Harvesting

In this paper, we consider a renewable energy powered wireless relay node which can work in either full- duplex (FD) or half-duplex (HD) mode. It decodes and stores data bits sent from source node, and then transfers them to destination node. We aim to maximize the average throughput from source to destination by optimizing the relay's working mode under the random energy arrival constraint. Optimal and sub-optimal policies are obtained by dynamic programming algorithm and linear programming based heuristic algorithm, respectively. It is found that pure FD/HD mode can achieve the optimal at high energy arrival rate regime or low rate regime. With moderate energy arrival rate, hybrid FD/HD mode is preferred, and the proposed heuristic algorithm performs close to the optimal. In addition, HD is optimal at low SNR regime as the strong self-interference greatly degrades the performance of FD.