Section: 6.22.1 Description
Content: Depending on operator's policies, deployment scenarios, subscriber profiles, and available services, different criterion will be used in determining which access attempt should be allowed or blocked when congestion occurs in the 5G System. These different criteria for access control are associated with Access Identities and Access Categories. The 5G system will provide a single unified access control where operators control accesses based on these two. In unified access control, each access attempt is categorized into one or more of the Access Identities and one of the Access Categories. Based on the access control information applicable for the corresponding Access Identity and Access Category of the access attempt, the UE performs a test whether the actual access attempt can be made or not. The unified access control supports extensibility to allow inclusion of additional standardized Access Identities and Access Categories and supports flexibility to allow operators to define operator-defined Access Categories using their own criterion (e.g. network slicing, application, and application server). NOTE: Clauses 4.1 through 4.4a of TS 22.011[ Service accessibility ]  are obsolete and replaced by clause 6.22.2 of this specification. However, when a UE is configured for EAB according to TS 22.011[ Service accessibility ] , the UE is also configured for delay tolerant service for 5G system.