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NSSF - Network Slice Selector Function The 5G System architecture (3GPP TS 23.501: 5G SA; Stage 2) consists of the following network functions (NF). - Authentication Server Function (AUSF) - Core Access and Mobility Management Function (AMF) - Data network (DN), e.g. operator services, Internet access or 3rd party services - Structured Data Storage network function (SDSF) - Unstructured Data Storage network function (UDSF) - Network Exposure Function (NEF) - NF Repository Function (NRF) - Network Slice Selection Function (NSSF) ======>>> our focus - Policy Control function (PCF) - Session Management Function (SMF) - Unified Data Management (UDM) - Unified Data Repository (UDR) - User plane Function (UPF) - Application Function (AF) - User Equipment (UE) - (Radio) Access Network ((R)AN)

4G steps towards moving into world of network slicing with different options to utilize the opportunities which cloud/ virtualization market unleashing. Final destination to 5G architecture, where the network slicing is build-in with NSSF introduction in 3GPP. CUPS – Control User Place Separation of 4G network. This attempts to separate the Control and User Place at SGW/ PGW to achieve better control and resource requirements for network deployments. (e)DÉCOR – (enhanced) Dedicated Core Network allocation DÉCOR – R13 (No UE Changes, UE Usage Type parameter in Subscription Data … /// describes UE usage characteristics that enables the selection of a specific Dedicated Core Network (DCN).… MME uses it to map to DCN value. DCN selection at ENodeB Messages where it can be contained ULR (MME-> HSS) / IDR (HSS -> MME) / Reset (HSS -> MME) Authentication Information Answer (AIA – S6A) 29272 – S6A spec - If the MME or SGSN supports the Dedicated Core Netwo