name: ARPF
full_form: Authentication credential Repository and Processing Function
context: In TS 33.501 [2], the ARPF is defined as a function to be provided within the UDM. For interworking with EPC (and IMS), in TS 23.501 [10], the HSS and the UDM are also defined as a combined NF, i.e. HSS+UDM where interactions between the HSS and the UDM are not specified. The HSS also includes the function to generate authentication vectors in EPS, IMS, GBA and GPRS/UMTS domains; i.e. the AuC. The HSS+UDM may be deployed as a stateful or stateless NF. Figure A.2-1 shows the ARPF deployment option when the HSS+UDM is deployed as a stateful NF and subscription credentials are stored within the HSS+UDM (i.e. within the AuC+ARPF). Figure A.2-1: Stateful ARPF deployment Figure A.2-2 shows the ARPF deployment option when the HSS+UDM is deployed as a stateless NF and subscription credentials are stored in the UDR (i.e. EPS + 5GS UDR). Figure A.2-2: Stateless ARPF deployment
description: The Authentication credential Repository and Processing Function (ARPF) is a network function responsible for storing and processing authentication credentials within the 5G core network, specifically within the Unified Data Management (UDM) or Home Subscriber Server (HSS). It plays a crucial role in user authentication and session management.
explanation: The ARPF is classified as a Network Function based on its deployment options and interactions with other network functions like HSS and UDM, as described in the context from 3GPP TS 33.845.
section_title: A.2	ARPF deployment options in 3GPP TS 33.501 [2] and TS 23.501 [10]
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