The disclosure also presents a user equipment (UE), e.g. a UE 101, 102, 103 as shown in FIG. 1 or a UE as shown in FIG. 2 or an RLAN UE 501 as shown in FIGS. 5 and 6, operating in a hierarchical communication system, in which a spectrum reserved for an Incumbent is usable by the UE for transmission when the spectrum is not required by the Incumbent. The UE comprises a processor that is configured to switch the UE into a mode protecting use of the spectrum by the Incumbent based on a handover request to a first frequency band from a network device, e.g. a citizen broadband radio system (CBRS). The handover request may result from a spectrum request indication from the Incumbent. The processor is further configured to enable transmission of the UE using the spectrum reserved for the Incumbent based on a handover request to a second frequency band from the network device, e.g. the CBRS. The second frequency band may include at least part of the spectrum reserved for the Incumbent. Note that in LSA, the incumbent may actively issue itself a spectrum request indication. In SAS, however, the Incumbent is typically not interacting with the SAS system, rather the SAS system has to detect that the Incumbent is in need to take back the spectrum. So, the trigger is finally not coming from the Incumbent itself but from a detection (sensing) circuitry in the SAS system. Hence, the handover request to the first frequency band is encompassing both. Also, the UE is typically not involved in the management/detection of such a trigger—this is only handled within the CBSDs. The handover request may come from the CBSDs, but the trigger itself is invisible, i.e. transparent to the UE. For the handover request to the second frequency, the same comments hold true, i.e. the trigger is transparent for the UE since it is managed at the CBSD level only. The UE only has received a handover (H/O) request to another band (which can be seen as an indirect indication of such a trigger).