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Systems | Serving GPRS Support Node

The Serving GPRS Support Node (SGSN) is the node serving the Mobile Station. The main functions of the SGSN include:

• Detection of new GPRS mobile stations in its service area
• Mobile Station authentication, authorization and admission control
• Sending and receiving of data packets to and from the mobile stations
• Recording of the location of mobile stations inside its service area

GPRS SGSN Supported Interfaces

• Gb - The interface between the SGSN and the BSS; this interface is Frame Relay
• Gn - The interface based on IP that is between the SGSN and the GGSN
• Gp - The interface based on IP between the SGSN & GGSN in different PLMNs
• Gr - The interface between the SGSN and the HLR
• Gs - The interface between the SGSN and the MSC/VLR
• Gd - The interface between the SGSN and the SMS-GMSC/SMS-IWMSC
• Ga - The interface between the SGSN and the Charging Gateway Function (CGF)

3G SGSN Supported Interfaces

• Ga - The interface between the SGSN and the Charging Gateway Function (CGF)
• Gs - The interface between the SGSN and the MSC/VLR
• Gi - The interface between the PLMN and external packet data networks
• luPS - The interface between the SGSN and the RNC

Critical Features

Price/Performance

• The market for 3G services will be highly competitive and operators need systems which allow them to serve large numbers of subscribers profitably and cost effectively.

Programmability

• Programmability eases the task of changing features and functionality in an SGSN, shortens time-to-market and increases the longevity of the equipment.

Modularity and Scalability

• When designed properly, such systems can effectively add more computing, protocol processing or I/O functions independently without requiring an entire system upgrade or replacement.

High Availability

• SGSN's must be designed with carrier-grade reliability. Systems must meet or exceed the industry benchmark of "five-nines" availability. Continuous Computing's DFT / HA helps achieve this.