Cisco Cisco ASR 5000
SGSN Administration Guide, StarOS Release 18 ▄
Chapter 2
SGSN in a 2.5G GPRS Network
This chapter outlines the basic configuration and operation of the Serving GPRS Support Node (SGSN) in 2.5G GPRS
wireless data networks.
wireless data networks.
The simplest configuration that can be implemented on the system to support SGSN functionality in a 2.5G network
requires one context but we recommend a minimum of two: one for the SGSN service (required) and another for the
charging context.
requires one context but we recommend a minimum of two: one for the SGSN service (required) and another for the
charging context.
The service context organizes the following:
GPRS service configuration
MAP (Mobile Application Part) configuration
DNS (Domain Naming System) configuration for resolution of APN (Access Point Name) domain names
SGTP (SGSN GPRS Tunneling Protocol) configuration
The charging context facilitates the following:
Configuration of connectivity to the CGF (Charging Gateway Function)
The following functionality is configured at the global or system level in the local management context:
NSEI (Network Service Entity Identity) configuration
SCCP (Signalling Connection Control Part) network configuration
SS7 (Signaling System 7) connectivity configuration
GTT (Global Title Translation) configuration
To simplify configuration management, more contexts can be created to categorize the service configuration. Each
context can be named as needed. The contexts listed above can be configured as illustrated in the figure on the next
page.
context can be named as needed. The contexts listed above can be configured as illustrated in the figure on the next
page.