name: IMEI
full_form: International Mobile Equipment Identity
context: untrusted and trusted WLAN access, as follows: - The 3GPP AAA server (if the ePDG/TWAN is in the HPLMN) or the 3GPP AAA proxy (if the ePDG/TWAN is in the VPLMN) is the entity that determines whether to trigger the IMEI check for the UE, and whether to continue or stop the procedure. - For untrusted WLAN, if required by local regulations, the ePDG is configured for retrieving the IMEI from the UE and to forward it to the AAA server/proxy. The AAA server/proxy directly accesses the EIR used in the same PLMN for IMEI checking. - For trusted WLAN in non-roaming cases, the 3GPP AAA server retrieves the IMEI from the UE and directly accesses the EIR used in the same PLMN for IMEI checking. - For trusted WLAN in roaming cases, the 3GPP AAA proxy requests the 3GPP AAA server in the HPLMN to retrieve the IMEI from the UE. The AAA server then forwards the retrieved IMEI to the TWAN, which relays it to the AAA proxy. As for untrusted WLAN, the AAA proxy directly accesses the EIR used in the same
description: IMEI (International Mobile Equipment Identity) is a unique identifier assigned to mobile devices, used for authentication and tracking purposes within telecommunications networks.
explanation: The context explicitly mentions IMEI as an identifier retrieved from the UE and checked against the EIR (Equipment Identity Register), highlighting its role as a critical network attribute for operation.
section_title: EIR check for WLAN access to EPC
biotag_Context: O,O,O,B-Network,O,O,O,O,O,B-Organization,B-Protocol,I-Protocol,O,O,O,O,O,O,O,O,O,B-Organization,B-Service,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,B-Device,O,O,O,O,O,O,B-Service,O,O,B-Service,O,O,O,O,B-Network Function,O,O,O,O,B-Network,O,B-Parameter,O,O,O,O,B-Network,O,O,O,O,B-Organization,B-Protocol,I-Protocol,O,O,B-Parameter,O,O,B-Device,O,O,O,O,B-Network Function,O,O,O,O,B-Network,O,B-Parameter,O,O,O,O,B-Network,O,O,O,O,B-Organization,B-Service,O,O,O,B-Organization,B-Protocol,I-Protocol,O,O,B-Parameter,O,O,O,B-Parameter,O,O,O,O,B-Protocol,I-Protocol,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,B-Service,O,O,O,O,O,O,B-Service,O,O,O,O,B-Network Function,O,O,O,O
biotag_Description: B-Parameter,O,B-Device,I-Device,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O