PDN Gateway Overview
▀ Network Deployment(s)
▄ Cisco ASR 5x00 Packet Data Network Gateway Administration Guide
26
Figure 4.
P-GW in the E-UTRAN/EPC Network
Supported Logical Network Interfaces (Reference Points)
The P-GW provides the following logical network interfaces in support of E-UTRAN/EPC network:
S2b Interface
The S2b interface reference point defined between the non-trusted non-3GPP ePDG (Evolved Packet Data Gateway)
and the P-GW uses PMIPv6 (Proxy Mobile IP version 6) for providing access to the EPC. GTPv2-C is the signaling
protocol used on the S2b. The S2b interface is based on 3GPP TS 29.274.
The S2b interface runs PMIPv6 protocol to establish WLAN UE sessions with the P-GW. It also supports the transport
of P-CSCF attributes and DNS attributes in PBU (Proxy-MIP Binding Update) and PBA (Proxy-MIP Binding
Acknowledgement) messages as part of the P-CSCF discovery performed by the WLAN UEs.
S5/S8 Interface