My 3GPP 23.501 Notes
My 3GPP 23.501 Notes
§ 5.2.1 General
Network access is the means for user to connect to 5G Core Network (CN). Network access control comprises the following functionality:
- Network selection,
- Identification and authentication,
- Authorization,
- Access control and barring,
- Policy control,
- Lawful Interception.
§ 5.2.2 Network Selection
To determine which PLMN to attempt registration, UE performs network selection. The network selection procedure comprises two main parts, PLMN selection and access network (AN) selection. The requirements for PLMN selection are specified in TS 22.011 and the procedures are in TS 23.122. The access network (AN) selection part for the 3GPP access networks is specified in TS 36.300 for E-UTRAN and in TS 38.300 for the NR. The network selection for Disaster Roaming is described in TS 23.122 and TS 24.501.
§ 5.2.3 Identification and authentication
The network may authenticate the UE during any procedure establishing a NAS signalling connection with the UE. The security architecture is specified in TS 33.501. The network may optionally perform an PEI check with 5G-EIR.
§ 5.2.4 Authorization
The authorization for connectivity of the subscriber to the 5GC and the authorization for the services that the user is allowed to access based on subscription (e.g. Operator Determined Barring, Roaming restrictions, Access Type and RAT Type currently in use) is evaluated once the user is successfully identified and authenticated. This authorization is executed during UE Registration procedure.
§ 5.2.5 Access control and barring see spec
§ 5.2.6 Policy control
Network access control including service authorization may be influenced by Policy control, as specified in clause 5.14.
§ 5.2.7 Lawful Interception
For definition and functionality of Lawful Interception, see TS 33.126.