As noted, the exemplary method and/or procedure shown in FIG. 5 or 7 can be performed by the apparatus or device 200 shown in FIG. 2, the virtual apparatus or device 300 shown in FIG. 3, or the virtualisation environment 400 shown in FIG. 4. Any of these may be part of, or associated with, the communication network. Embodiments of this disclosure provide an apparatus, device, virtual apparatus or virtual device configured to perform the method in FIG. 5, FIG. 7, or any embodiment of the methods presented in this disclosure. Other embodiments of this disclosure provide an apparatus, device, virtual apparatus or virtual device comprising a processor and a memory, e.g. processing circuitry 201 and memory 203 in FIG. 2 or processing circuitry 360 and memory 390-1 in FIG. 3, with the memory containing instructions executable by the processor so that the apparatus, device, virtual apparatus or virtual device is operative to perform the method in FIG. 5 or 7 or any embodiment of those methods presented in this disclosure.