It is not always intuitive why 5G, as a mobile air interface, “requires” the use of virtualized core networks, though that is the case. The best example of “why” this is so is “network slicing,” the ability of a virtualized core network to create logical networks from a physical core.
Say a mobile service provider or large enterprise wants to create a private network using 5G air interfaces, for example. To deliver services across the core, and then in the access network, also requires that the radio access infrastructure be able to seamlessly use the core network “slices.”
In principle, that is the same thing physical core networks have offered for entities using a discrete set of cables, routes, optical fibers or wavelengths in the core, and then some access network (radio or wired).
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