  This paper studies integrated sensing and communication (ISAC) technology in
a full-duplex (FD) uplink communication system. As opposed to the half-duplex
system, where sensing is conducted in a first-emit-then-listen manner, FD ISAC
system emits and listens simultaneously and hence conducts uninterrupted target
sensing. Besides, impressed by the recently emerging reconfigurable intelligent
surface (RIS) technology, we also employ RIS to improve the self-interference
(SI) suppression and signal processing gain. As will be seen, the joint
beamforming, RIS configuration and mobile users' power allocation is a
difficult optimization problem. To resolve this challenge, via leveraging the
cutting-the-edge majorization-minimization (MM) and penalty-dual-decomposition
(PDD) methods, we develop an iterative solution that optimizes all variables
via using convex optimization techniques. Numerical results demonstrate the
effectiveness of our proposed solution and the great benefit of employing RIS
in the FD ISAC system.
