Section: 28.9 Internal-Group Identifier
Content: Internal-Group Identifier is a network internal globally unique ID which identifies a set of SUPIs (e.g. MTC devices) from a given network that are grouped together for one specific group related service (see 3GPP TS 23.501[ System architecture for the 5G System (5GS) ]  [119] clause 5.9.7). An Internal-Group Identifier shall be composed in the same way as IMSI-Group Identifier (see clause 19.9). If a 5G subscriber's IMSI belongs to an IMSI-Group identified by a given IMSI-Group Identifier X, the IMSI shall also belong to the Internal-Group identified by the Internal-Group Identifier X.