Section: 17.2.3 Fast Re-authentication NAI
Content: The Fast Re-authentication NAI in both EAP-SIM and EAP-AKA shall take the form of an NAI as specified in clause 2.1 of IETF RFC 4282 [53]. The UE shall use the re-authentication identity received during the previous EAP-SIM or EAP-AKA authentication procedure. If such an NAI contains a realm part then the UE should not modify it, otherwise it shall use a home network realm as defined in clause 17.2.1. The result will therefore be an identity of the form: "<re-authentication_ID_username>@<re-authentication_ID_realm> for both EAP-SIM and EAP-AKA authentication when a realm is present in the re-authentication identity received during the previous EAP-SIM or EAP-AKA authentication procedure and "<re-authentication_ID_username>@gan.mnc<MNC>.mcc<MCC>.3gppnetwork.org", for both EAP-SIM and EAP-AKA authentication when a realm is not present in the re-authentication identity received during the previous EAP-SIM or EAP-AKA authentication procedure. EXAMPLE 1: If the re-authentication identity is "12345" and the IMSI is 234150999999999 (MCC = 234, MNC = 15), the Fast Re-authentication NAI takes the form 12345@gan.mnc015.mcc234.3gppnetwork.org EXAMPLE 2: If the re-authentication identity is "12345@aaa1.gan.mnc015.mcc234.3gppnetwork.org", the Fast Re-authentication NAI takes the form 12345@aaa1.gan.mnc015.mcc234.3gppnetwork.org