Optimization of NF placement in a dynamically-changing environment like a mobile network is a challenge. In the 5G era, the need to guarantee QoS for slice-based services makes this even more complex. Networks are becoming virtual and cloud based, and there is a need to manage this new agility and complexity.
Of course, operators are doing NF placement, today. However, with the advent of 5G, new use cases based on network slicing will require committed SLAs around attributes like latency and capacity.