Section: 28.3.2.2.2 Operator Identifier based N3IWF FQDN
Content: The N3IWF Fully Qualified Domain Name (N3IWF FQDN) contains an Operator Identifier that shall uniquely identify the PLMN where the N3IWF is located. The N3IWF FQDN is composed of seven labels. The last three labels shall be "pub.3gppnetwork.org". The third and fourth labels together shall uniquely identify the PLMN. The first two labels shall be "n3iwf.5gc". The N3IWF FQDN shall be constructed as follows: "n3iwf.5gc.mnc<MNC>.mcc<MCC>.pub.3gppnetwork.org" In the roaming case, the UE can utilise the services of the VPLMN or the HPLMN. In this case, the Operator Identifier based N3IWF FQDN shall be constructed as described above, but using the MNC and MCC of the VPLMN or the HPLMN. In order to guarantee inter-PLMN DNS translation, the <MNC> and <MCC> coding used in the "n3iwf.5gc. mnc<MNC>.mcc<MCC>.pub.3gppnetwork.org" format of the Operator Identifier based N3IWF FQDN shall be: - <MNC> = 3 digits - <MCC> = 3 digits If there are only 2 significant digits in the MNC, one "0" digit shall be inserted at the left side to fill the 3 digits coding of MNC in the N3IWF FQDN. As an example, the Operator Identifier based N3IWF FQDN for MCC 345 and MNC 12 is coded in the DNS as: "n3iwf.5gc.mnc012.mcc345.pub.3gppnetwork.org".