name: LPCF
full_form: LI Policy Control Function
context: Xib is used by the S-GW/BBIFF to inform the LPCF of the presence of a target (e.g. establishment of IMS bearer(s)). The LPCF then configures the S-GW/BBIFF to deliver traffic to DF3. This option assumes that the VPLMN retrieves the IMEI during the LTE (re-)attach procedure such as for EIR based fraud detection and prevention. The following summarizes the key steps of this approach: 1. LMISF receives over the X1_1 interface the request to activate interception for a target IMEI. 2. The LMISF provides the target IMEI to the LPCF over the Xic interface without any association identity as required for option 1. 3. The LPCF then indicates the IMEI to the S-GW/BBIFF to start interception of any bearers associated with the IMEI that are used for IMS (signalling and/or content) along with directions for where to deliver each bearer. 4. The S-GW/BBIFF then delivers (under LPCF direction) the signalling bearers to the LMISF for service processing and for delivery to DF2 over the X2 interface and
description: The LI Policy Control Function (LPCF) is a network function responsible for controlling and managing lawful interception policies within the telecommunications network. It receives requests from the Lawful Interception Management System Function (LMISF) to activate interception for specific targets, such as IMEI, and configures the Serving and Packet Data Network Gateway (S-GW/BBIFF) to deliver traffic accordingly.
explanation: The context explicitly describes the LPCF's role in controlling lawful interception policies, receiving requests from LMISF, and configuring S-GW/BBIFF for traffic delivery. This matches the definition of a Network Function, which includes components that manage and control network operations.
section_title: 6.1.5.1.3	Option 2: Detection of IMEI at S-GW/BBIFF
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