Serving GPRS Support Node (SGSN) Overview
▀ Network Deployments and Interfaces
▄ Cisco ASR 5000 Series Product Overview
GTPv0 and GTPv1, with the capability to auto-negotiate the version to be used with any particular peer
GTP-C (control plane) and GTP-U (user plane)
Transport over ATM/STM-1Optical, Fast Ethernet, and Ethernet 1000 line cards/QGLCs)
One or more Gn/Gp interfaces configured per system context
As well, the SGSN can support the following IEs from later version standards:
IMEI-SV
RAT TYPE
User Location Information
Gr: This is the interface to the HLR. It supports SIGTRAN (M3UA/SCTP/IP) over Ethernet.
Some of the procedures supported by the SGSN on this interface are:
Send Authentication Info
Update Location
Insert Subscriber Data
Delete Subscriber Data
Cancel Location
Purge
Reset
Ready for SM Notification
SIGTRAN based interfaces M3UA/SCTP
Peer connectivity can be through an intermediate SGP or directly depending on whether the peer (HLR,
EIR, SMSC, GMLC) is SIGTRAN enabled or not
SCTP Multi-Homing supported to facilitate network resiliency
M3UA operates in ASP & IPSP client/server and single/double-ended modes
Multiple load shared M3UA ASP instances for high-performance and redundancy
Works over Ethernet (IPoA) interface
Ga: The SGSN uses the Ga interface with GTP Prime (GTPP) to communicate with the charging gateway (CG,
also known as CGF) and/or the GTPP Storage Server (GSS). The interface transport layer is typically UDP
over IP but can be configured as TCP over IP for:
One or more Ga interfaces per system context, and
An interface over Ethernet 10/100 or Ethernet 1000 interfaces
The charging gateway handles buffering and pre-processing of billing records and the GSS provides storage for
Charging Data Records (CDRs). For additional information regarding SGSN charging, refer to the Charging
section.
Gd: This is the interface between the SGSN and the SMS Gateway (SMS-GMSC / SMS-IWMSC) for both 2G
and 3G technologies through multiple interface mediums. Implementation of the Gd interface requires
purchase of an additional license.
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