GGSN Support in GPRS/UMTS Wireless Data Services
▄ Cisco ASR 5000 Series Product Overview
Product Description
The GGSN works in conjunction with Serving GPRS Support Nodes (SGSNs) within the network to perform the
following functions:
Establish and maintain subscriber Internet Protocol (IP) or Point-to-Point Protocol (PPP) type Packet Data
Protocol (PDP) contexts originated by either the mobile or the network
Provide charging detail records (CDRs) to the charging gateway (CG, also known as the Charging Gateway
Function (CGF))
Route data traffic between the subscriber‘s Mobile Station (MS) and a Packet Data Networks (PDNs) such as the
Internet or an intranet
PDNs are associated with Access Point Names (APNs) configured on the system. Each APN consists of a set of
parameters that dictate how subscriber authentication and IP address assignment is to be handled for that APN.
In addition, to providing basic GGSN functionality as described above, the system can be configured to support Mobile
IP and/or Proxy Mobile IP data applications in order 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 stand-
alone Home Agent (HA), or a GGSN, FA, and HA simultaneously within the carrier's network.
Figure 80. Basic GPRS/UMTS Network Topology
In accordance with RFC 2002, the FA is responsible for mobile node registration with, and the tunneling of data traffic
to/from the subscriber‘s home network. The HA is also responsible for tunneling traffic, but also maintains subscriber
location information in Mobility Binding Records (MBRs).
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