Joint Traffic Scheduling and Duplex Mode Selection in Full-Duplex Relay Networks

Abstract

Recent progress in supplying the capability of full-duplex (FD) transmission on a single wireless link has attracted great attention as a promising technology to boost the spectral efficiency. Due to the co-channel interference, FD communications sometimes achieve lower spectrum efficiency compare to the half-duplex (HD) communications. Besides, the heterogeneity of traffics can also decrease the spectrum efficiency on FD transmission. Thus, duplex mode selection and traffic scheduling become significant issues in FD systems. In this paper, we propose a new cross-layer optimization strategy to improve the cell-edge coverage in a FD relay-centered network. We formulate the duplex mode selection and traffic scheduling as a Markov decision process (MDP)-based joint optimization problem, where an unified evaluation model with the multi-utility satisfaction index is constructed with the consideration of diverse metrics under different network preferences. A TSDMS iteration algorithm is proposed to maximize the long term network utility. Simulation results show that different network preferences can be guaranteed, and our strategy exhibits significantly gains compared to the conventional relay approaches.