name: PCRF
full_form: Policy and Charging Rules Function
context: of PRAs have been defined, which can be mixed: 1) UE dedicated PRA: those PRAs information are provisioned by the PCRF/OCS to the MME each time the IP-CAN session is established. The PRA information includes both the PRA ID and the PRA list. 2) Predefined PRA: the PRA list has been predefined in the MME, and the PCRF only needs to indicate the PRA IDs so as to activate the corresponding PRAs in the MME. 3) PRA set: The PCRF can indicate one PRA set ID to activate a group of PRAs predefined in the MME. The PCRF can subscribe PRAs monitoring for a given UE in term of event trigger and the MME will report to PCRF via S/P-GW as soon as the UE enters/leaves the subscribed PRAs. Since multiple PRAs reporting is supported, this leads to the updating of the "attach" and "handover" procedures. The MME can select and activate only a part of PRAs indicated from PCRF and return the result to PCRF. The figure below shows how does the PRA id and the list is provisioned to the MME and the triggering
description: The Policy and Charging Rules Function (PCRF) is a network function responsible for provisioning policy and charging rules to other network functions, such as the Mobility Management Entity (MME), in order to manage user equipment (UE) sessions and enforce policies related to access and mobility.
explanation: The context describes PCRF's role in managing UE sessions, enforcing policies, and interacting with other network functions like MME. This clearly indicates that PCRF is a component responsible for controlling and managing network operations, aligning with the definition of a Network Function.
section_title: Improvements of awareness of user location change
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