  Full-duplex (FD) communication has received great interest in recent years
due to the potential of doubling the spectral efficiency. However, how to
alleviate the detrimental effects of the residual self-interference (RSI)
incurred by the FD mode is still a challenging problem. In this paper, focusing
on the statistical throughput maximization, we propose an optimal hybrid
FD/half-duplex (HD) scheme for the one-way FD buffer aided relay system. To
solve this problem, we divide the system into four different transmission modes
and formulate the problem as a binary integer programming problem. By relaxing
the binary variables to be continuous ones, we solve the problem using the
Karush-Kuhn-Tucker (KKT) optimal conditions. We obtain the selection
probability of each mode based on the instantaneous channel outage states. The
proposed scheme not only achieves the optimal FD or HD mode selection, but also
realizes adaptive source-to-relay or relay-to-destination link selection.
Simulation results show that the proposed scheme offers 95% maximum gain over
the HD counterparts.
