Ggsn

GGSN - GPRS Gateway Support Node - a node that is part of the GPRS Core Network and provides data routing between the GPRS Core network (GTP) and external IP networks.

In addition to routing, GGSN can participate in the activation of the PDP context, providing authentication requests to the RADIUS server, as well as interacting with DNS servers to determine the IP address requested by the APN user.

GGSN is a gateway (ordinary router) between the cellular network (its part for GPRS data transmission) and external Packet Data Networks: Internet, Intranet corporate networks, and other GPRS-systems. GGSN contains all the necessary information about networks where GPRS subscribers can access, as well as connection parameters.

The main function of the GGSN is the routing (routing) of data going to and from the subscriber via SGSN .

Other functions of the GGSN are:

• data addressing;
• dynamic issuance of IP addresses;
• tracking information about external networks and own subscribers (including tariffication of services);
• storage of the routing database, the database with addresses and the filtering database.

GPRS-system has good scalability . With an increase in the number of subscribers, the operator can increase the capacity of the GPRS system by expanding or installing additional SGSN packet switches. With an increase in total traffic (with an insignificant increase in the number of subscribers), add new GPRS-GGSN gateways and base station systems to the system, which will provide a large total throughput of the entire system.