SGSN - meaning and definition. What is SGSN
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What (who) is SGSN - definition

CENTRAL PART OF THE GENERAL PACKET RADIO SERVICE
PDP Context; Gateway GPRS Support Node; SGSN; PDP context; GTP-U; Packet Data Protocol; Packet Switched Core Network; GGSN; GPRS Gateway Support Node; Serving GPRS Support Node; GPRS Core Network; Serving GPRS support node

SGSN         
Serving GPRS Support Node (Reference: GPRS, mobile-systems)
GGSN         
Gateway GPRS Support Node (Reference: GPRS, mobile-systems)
GPRS core network         
The GPRS core network is the central part of the general packet radio service (GPRS) which allows 2G, 3G and WCDMA mobile networks to transmit IP packets to external networks such as the Internet. The GPRS system is an integrated part of the GSM network switching subsystem.

Wikipedia

GPRS core network

The GPRS core network is the central part of the general packet radio service (GPRS) which allows 2G, 3G and WCDMA mobile networks to transmit Internet Protocol (IP) packets to external networks such as the Internet. The GPRS system is an integrated part of the GSM network switching subsystem.

The network provides mobility management, session management and transport for IP packet services in GSM and WCDMA networks. The core network also provides support for other functions such as billing and lawful interception. It was also proposed, at one stage, to support packet radio services in the US D-AMPS TDMA system, however, in practice, all of these networks have been converted to GSM so this option has become irrelevant.

PRS module is an open standards driven system. The standardization body is the 3GPP.