GGSN Support in GPRS/UMTS Wireless Data Services
Cisco ASR 5000 Series Product Overview ▄
How GGSN Works
This section provides information on the function of the GGSN in a GPRS/UMTS network and presents call procedure
flows for different stages of session setup.
The following topics and procedure flows are included:
PDP Context Processing
Dynamic IP Address Assignment
Subscriber Session Call Flows
PDP Context Processing
PDP context processing is based on the APN that the subscriber is attempting to access. Templates for all of the possible
APNs that subscribers will be accessing must be configured within the system. Up to 1024 APNs can be configured on
the system.
Each APN template consists of parameters pertaining to how PDP contexts are processed such as the following:
Type: The system supports IPv4, IPv6, and PPP PDP contexts.
Accounting protocol: Support is provided for using either the GTPP or Remote Authentication Dial-In User
Service (RADIUS) protocols. In addition, an option is provided to disable accounting if desired.
Authentication protocol: Support is provided for using any of the following:
Challenge Handshake Authentication Protocol (CHAP)
Microsoft CHAP (MSCHAP)
Password Authentication Protocol (PAP)
Mobile Station Identity (MSID)-based authentication
In addition, an option is provided to disable authentication if desired.
Charging characteristics: Each APN template can be configured to either accept the charging characteristics it
receives from the SGSN for a PDP context or use it‘s own characteristics.
IP address allocation method: IP addresses for PDP contexts can be assigned using one of the following
methods:
Statically: The APN template can be configured to provide support for MS-requested static IP
addresses. Additionally, a static address can be configured in a subscriber‘s profile on an
authentication server and allocated upon successful authentication.
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