Section: 12.7.3 Group ID for Network Selection (GIN)
Content: The "Group ID for Network Selection" (GIN) identifies a group (e.g. a consortium) of Credential Holders or Default Credential Servers (see 3GPP TS 23.501[ System architecture for the 5G System (5GS) ]  [119], clause 5.30.2) that can be used to authenticate and authorize the access to an SNPN; the GIN is used during SNPN selection by the UE to enhance the likelihood of selecting a preferred SNPN. The GIN has the same structure as the SNPN identifier (see clause 12.7.1) and shall consist of MCC, MNC and NID, where the NID contains 44 bits, i.e. 11 hexadecimal digits; one digit (4 bits) for representing an assignment mode and 10 digits (40 bits) for a NID value, as shown in figure 12.7.1-1. The GIN can be assigned using the following assignment models: a) Self-assignment: GINs are chosen individually and may therefore not be unique; this assignment model is encoded by setting the assignment mode to value 1. b) Coordinated assignment: GINs are assigned using one of the following two options: - option 1: the GIN is assigned such that the NID is globally unique independent of the PLMN ID used. Option 1 of this assignment model is encoded by setting the assignment mode to value 0. - option 2: the GIN is assigned such that the combination of the NID and the PLMN ID is globally unique. Option 2 of this assignment model is encoded by setting the assignment mode to value 2. Other Assignment mode values are spare, for future use.