r is a passive three-port device in which an RF signal entering any port is only transmitted to the next port in rotation. Both direct and scattered self- interference can be represented as a combination of linear and nonlinear components. The suppression in the propagation domain can mitigate both linear and nonlinear self- interference at the same time and with the same isolation value. Meanwhile, cancellation techniques in the analog and digital domains have different performances for the two com- ponents. The self-interference cancellation is implemented in three domains: propagation, analog, and digital. Since none of these domains can meet the required cancellation New Radio Access Physical Layer Aspects (Part 1) 375 requirements, hybrid solutions have been proposed in the literature [40,41]. The primary role of self-interference cancellation in the propagation and analog domains is to avoid the saturation of the receiver due to the high power of the self-interference signal as this power exceeds the ADC dynamic range and limits its precision after conversion because the desired signal is much weaker than the self-interference. Self-interference comprises several components with different characteristics depending on the specifics of the full-duplex system implementation, such as the number of antennas, the characteristics of the RF components and the environment. The constituents of the self- interference can be classified by linearity. Linear components involve multipath propagation between the transmit/receive antennas. For a single-antenna system, linear components include the leakage of the circulator or the reflections from impedance mismatch. Components of RF circuits, such as attenuators and delay lines, are also modeled as linear systems for analog self-interference cancelation. The linear components of self-interference can be removed by the existing channel estimation methods, as in most conventional wire- less communication systems. Nonlinear components are usually created by PAs in transmit- te