2.2.1.5
Packet Data Network Gateway (P-GW)
P-GW is the element of EPS that connects the EPS to the external data network. It can
be compared to a router that connects EPS to external network. Just like a router, it allo-
cates the IP addresses to the UE attached to the EPS using the Dynamic Host Control
Protocol (DHCP). It could also provide the requested IP via externally connected dedi-
cated DHCP server.
The user plane data is communicated between UE and external data networks in the
form of IP packets. P-GW interacts with the PCRF for appropriate policy control infor-
mation. When the UE switches from one S-GW to another, the bearers need to be
switched in the P-GW. Alike S-GW, the P-GW can also be used for monitoring and
charging purposes.
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