  The use of in-band full-duplex (FD) enables nodes to simultaneously transmit
and receive on the same frequency band, which challenges the traditional
assumption in wireless network design. The full-duplex capability enhances
spectral efficiency and decreases latency, which are two key drivers pushing
the performance expectations of next-generation mobile networks. In less than
ten years, in-band FD has advanced from being demonstrated in research labs to
being implemented in standards, presenting new opportunities to utilize its
foundational concepts. Some of the most significant opportunities include using
FD to enable wireless networks to sense the physical environment, integrate
sensing and communication applications, develop integrated access and backhaul
solutions, and work with smart signal propagation environments powered by
reconfigurable intelligent surfaces. However, these new opportunities also come
with new challenges for large-scale commercial deployment of FD technology,
such as managing self-interference, combating cross-link interference in
multi-cell networks, and coexistence of dynamic time division duplex, subband
FD and FD networks.
