name: USIM
full_form: User Services Identity Module
context: The proposed solution describes a means of providing IOPS security using a USIM application dedicated exclusively for IOPS operation on a UICC and using existing AKA procedures (termed USIM application #2). Furthermore the proposed solution describes the possible use of a USIM application for 'normal' network-based operation (termed USIM application #1) together with USIM application#2. USIM application #1and USIM application #2 use distinct sets of security credentials and both comply with current 3GPP specifications. The proposed solution places no restriction on the distribution of USIM application #1 and USIM application #2 between one or more UICCs. NOTE: This solution neither limits the number of USIM applications nor demands exactly two. An IOPS-capable UE can operate in IOPS only or if configured, can switch between IOPS mode of operation and 'normal' mode by means of switching between the different USIM applications.
description: The User Services Identity Module (USIM) stores user credentials and provides authentication services for accessing network resources. It's embedded in a UICC (Universal Integrated Circuit Card) and supports multiple applications, including IOPS and regular network operations.
explanation: The USIM is described as a physical component within a UICC that performs authentication functions. This classification as a device aligns with its role as a hardware element responsible for security and user identification.
section_title: 7.1.1 	Introduction
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