Cisco Cisco Packet Data Interworking Function (PDIF)
SaMOG Gateway Overview
▀ Network Deployment and Interfaces
▄ SaMOG Administration Guide, StarOS Release 19
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P-GW
The Packet Data Network Gateway (P-GW) is the network node that terminates the SGi interface towards the PDN. The
P-GW provides connectivity to external PDNs for the subscriber UEs by being the point of entry and exit for all
subscriber UE traffic. A subscriber UE may have simultaneous connectivity with more than one P-GW for accessing
multiple PDNs. The P-GW performs policy enforcement, packet filtering, charging support, lawful interception, and
packet screening. The P-GW is the mobility anchor for both trusted and untrusted non-3GPP IP access networks. For
trusted non-3GPP IP access networks, the P-GW hosts the LMA (Local Mobility Anchor) function for the PMIP-based
S2b interface, and the SaMOG Gateway’s CGW service hosts the LMA function for the PMIP/EoGRE-based S2a
interface.
P-GW provides connectivity to external PDNs for the subscriber UEs by being the point of entry and exit for all
subscriber UE traffic. A subscriber UE may have simultaneous connectivity with more than one P-GW for accessing
multiple PDNs. The P-GW performs policy enforcement, packet filtering, charging support, lawful interception, and
packet screening. The P-GW is the mobility anchor for both trusted and untrusted non-3GPP IP access networks. For
trusted non-3GPP IP access networks, the P-GW hosts the LMA (Local Mobility Anchor) function for the PMIP-based
S2b interface, and the SaMOG Gateway’s CGW service hosts the LMA function for the PMIP/EoGRE-based S2a
interface.
GGSN
The GGSN works in conjunction with Serving GPRS Support Nodes (SGSNs) within the network and routes data traffic
between the subscriber’s Mobile Station (MS) and a Packet Data Networks (PDNs) such as the Internet or an intranet.
GGSN can be configured to support Mobile IP and/or Proxy Mobile IP data applications to provide mobility for
subscriber IP PDP contexts. When supporting these services, the system can be configured to either function as a GGSN
and Foreign Agent (FA), a standalone Home Agent (HA), or a GGSN, FA, and HA simultaneously within the carrier's
network.
between the subscriber’s Mobile Station (MS) and a Packet Data Networks (PDNs) such as the Internet or an intranet.
GGSN can be configured to support Mobile IP and/or Proxy Mobile IP data applications to provide mobility for
subscriber IP PDP contexts. When supporting these services, the system can be configured to either function as a GGSN
and Foreign Agent (FA), a standalone Home Agent (HA), or a GGSN, FA, and HA simultaneously within the carrier's
network.
3GPP AAA Server
The 3GPP Authentication, Authorization, and Accounting (AAA) server provides UE authentication via the Extensible
Authentication Protocol - Authentication and Key Agreement (EAP-AKA) authentication method.
Authentication Protocol - Authentication and Key Agreement (EAP-AKA) authentication method.
HSS
The Home Subscriber Server (HSS), is the master user database that supports the IP Multimedia Subsystem (IMS)
network entities. It contains subscriber profiles, performs subscriber authentication and authorization, and provides
information about the subscriber's location and IP information.
network entities. It contains subscriber profiles, performs subscriber authentication and authorization, and provides
information about the subscriber's location and IP information.
PCRF
The PCRF (Policy and Charging Rules Function) determines policy rules in the IMS network. The PCRF operates in the
network core, accesses subscriber databases and charging systems, and makes intelligent policy decisions for
subscribers.
network core, accesses subscriber databases and charging systems, and makes intelligent policy decisions for
subscribers.
Trusted Non-3GPP IP Access
The trusted non-3GPP IP access contains one or more WLAN access points. An access point terminates the UE's
WLAN IEEE 802.11 link defined in IEEE standard 802.11-2007.
WLAN IEEE 802.11 link defined in IEEE standard 802.11-2007.
Logical Network Interfaces
The following table provides descriptions of the logical network interfaces supported by the SaMOG Gateway in the
EPC network.
EPC network.