name: AF
full_form: Application Function
context: Prior to these flows, the UE proceeds to Initial Attach towards the VPLMN PGW allocated for the selected APN. A PDN connection with a default bearer is created as described in Figure 4.2.1.2.2.1. For simplification, it is assumed only one Rx interaction occurs between the AF and the PCRF for initial provisioning of service information with media IP flows description, and instruction from AF to enable these IP flow(s). Figure 4.2.4.2.1: Service provided by AF in HPLMN â establishment UE interaction occurs with the AF for requesting the service. AF service level behaviour is not described. 1. The AF provides service and media component information to the H-PCRF by sending a Diameter AAR over a new Rx Diameter session for the session authorization and provisioning the corresponding PCC rules with IP flow(s) enablement. An AF-Application-Identifier is provided for identifying the particular service. 2. The H-PCRF stores the received Service Information and performs check from
description: The Application Function (AF) is a network component that provides services to users by interacting with the Policy and Charging Rules Function (PCRF). It sends Diameter AAR messages to the PCRF for session authorization and provisioning, enabling IP flows. The AF also provides service and media component information.
explanation: Based on the context from 3GPP TS 32.843, section 4.2.4.2, the AF is classified as a Network Function because it interacts with other network components (e.g., PCRF) to provide services and enable IP flows.
section_title: 4.2.4.2Message Flow
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