Cisco Cisco ASR 5000
Serving GPRS Support Node (SGSN) Overview
▀ How the SGSN Works
▄ SGSN Administration Guide, StarOS Release 18
How the SGSN Works
This section illustrates some of the GPRS mobility management (GMM) and session management (SM) procedures the
SGSN implements as part of the call handling process. All SGSN call flows are compliant with those defined by 3GPP
TS 23.060.
SGSN implements as part of the call handling process. All SGSN call flows are compliant with those defined by 3GPP
TS 23.060.
First-Time GPRS Attach
The following outlines the setup procedure for a UE that is making an initial attach.
Figure 9.
Simple First-Time GPRS Attach
This simple attach procedure can connect an MS via a BSS through the Gb interface (2.5G setup) or it can connect a UE
via a UTRAN through the Iu interface in a 3G network with the following process:
via a UTRAN through the Iu interface in a 3G network with the following process:
Table 2. First-Time GPRS Attach Procedure
Step
Description
1
The MS/UE sends an Attach Request message to the SGSN. Included in the message is information, such as:
Routing area and location area information
Mobile network identity
Attach type