PGW-U – PDN Gateway User plane function
The PGW-U serves as the user data plane ingress and egress point to the EPC when control and user plane separation is in place. When a subscriber establishes an EPS (Evolved Packet System) bearer to a given PDN, the PGW-U under the control of the PGW-C serves as the point of attachment to that PDN for the life of the EPS bearer (regardless of any mobility procedures). Packet inspection is a key role of the PGW-U in order to ensure that data has the appropriate service level applied.
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