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The upcoming Sixth Generation (6G) mobile communications system envisionssupporting a variety of use cases with differing characteristics, e.g., verylow to extremely high data rates, diverse latency needs, ultra massiveconnectivity, sustainable communications, ultra-wide coverage etc. Toaccommodate these diverse use cases, the 6G system architecture needs to bescalable, modular, and flexible; both in its user plane and the control plane.In this paper, we identify some limitations of the existing Fifth GenerationSystem (5GS) architecture, especially that of its control plane. Further, wepropose a novel architecture for the 6G System (6GS) employing Software DefinedNetworking (SDN) technology to address these limitations of the control plane.The control plane in existing 5GS supports two different categories offunctionalities handling end user signalling (e.g., user registration,authentication) and control of user plane functions. We propose to move theend-user signalling functionality out of the mobile network control plane andtreat it as user service, i.e., as payload or data. This proposal results in anevolved service-driven architecture for mobile networks bringing increasedsimplicity, modularity, scalability, flexibility and security to its controlplane. The proposed architecture can also support service specific signallingsupport, if needed, making it better suited for diverse 6GS use cases. Todemonstrate the advantages of the proposed architecture, we also compare itsperformance with the 5GS using a process algebra-based simulation tool.

Applying SDN to Mobile Networks: A New Perspective for 6G Architecture