name: PGW-C
full_form: PDN Gateway Control Plane
context: is also referred to as IMS media bearer. - The PGW-C in HPLMN is aware of the QCI used for a bearer and provides the same to the SGW-C during the bearer activation steps. - The SGW-C can determine whether a bearer is used for IMS signalling or IMS media based on the QCI value received from the PGW-C (i.e. 5 for IMS signalling bearer and 1 for IMS voice media bearer, see NOTE 1). - Within the SGW-U, the IMS signalling packets and the IMS voice media packets are on separate bearers of the PDN connection. Therefore, based on the bearer information, the SGW-U can be made to recognise and hence, isolate the UP packets. S8HR LI is based on this principle. - The IMS signalling bearer ID is linked to the IMS media bearer. This helps to associate the IMS media with the IMS signalling. - When a SGW relocation occurs, the new SGW-C can determine that a relocation has occurred based on the timing at which it receives the eNB tunnel ID used for the default bearer during the PDN connection
description: The PDN Gateway Control Plane (PGW-C) manages the control plane of the PDN gateway in the Evolved Packet Core (EPC) architecture. It handles bearer activation, QCI management, and IMS media bearer handling.
explanation: PGW-C performs specific control plane functions within the EPC architecture, such as managing bearers, assigning QoS levels (QCI), and controlling IMS signaling and media traffic. This clearly classifies it as a Network Function.
section_title: 4.8.3.2	S8HR LI, EPC with CUPS
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