  The upcoming sixth generation (6G) communications systems are expected to
support an unprecedented variety of applications, pervading every aspect of
human life. It is clearly not possible to fulfill the service requirements
without actualizing a plethora of flexible options pertaining to the key
enabler technologies themselves. At that point, this work presents an overview
of the potential 6G key enablers from the flexibility perspective, categorizes
them, and provides a general framework to incorporate them in the future
networks. Furthermore, the role of artificial intelligence and integrated
sensing and communications as key enablers of the presented framework is also
discussed.
