In order to meet the 5G key requirements such as latency and the large number of simultaneous
connections, and to support new business models and scenarios for operators, technologies above the radio access level should also be considered.
Therefore, we need to develop technologies at the system architecture level from the network point of view.
To accomplish the 5G key requirements and support the increased data rate of new 5G radio access, 5G network will have to evolve towards a distributed and flat architecture.