name: PCEF
full_form: Policy and Charging Enforcement Function
context: The figure 7.2.2.1 describes the message flow of the offline charging procedure for the support of CAT. Figure 7.2.2.1: Offline charging procedure for support of CAT 1. P-CSCF sends the Rx signalling to inform the start of CAT. 2. PCRF sends Gx message to PCEF to inform the start of CAT. A1. When the PCEF detects the start of CAT media, PCEF sends a Charging Data Request [Start] to record start of a CAT media in the CDR. A2. The CDF acknowledges the reception of the data and opens CDR. 3. PCEF response the Gx message. 4. PCRF response the Rx message. 5. P-CSCF sends the Rx signalling to inform the start of the normal session and termination of CAT. 6. PCRF sends Gx message to PCEF to inform the start of the normal session and termination of CAT. B1. When the PCEF detects the termination of CAT media, PCEF sends a Charging Data Request [Stop] to record stop of the CAT media in the CDR. B2. The CDF acknowledges the reception of the data and closes the CDR. C1. When the PCEF detects the
description: The Policy and Charging Enforcement Function (PCEF) is a network function responsible for enforcing policy decisions made by the Policy and Charging Rules Function (PCRF) and for collecting charging information related to the usage of network resources. It plays a crucial role in managing the flow of data traffic and ensuring that it complies with the policies defined by the PCRF.
explanation: PCEF is classified as a Network Function based on its role in enforcing policy decisions, collecting charging information, and interacting with other network functions such as PCRF and CDF to manage data traffic and ensure compliance with defined policies.
section_title: 7.2.2Offline charging support of CAT
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