SGSN
•
Delivers data packets from and
to mobile stations.
•
Mobility Management
•
Authentication
•
Billing and maintaining user
profiles.
GGSN
•
Interfaces
GPRS backbone network with
•
external packet data networks (PDNs)
•
e.g. : IP networks, Internet
•
Translation
between PDP(Packet Data protocol) addresses and GSM addresses
•
Authentication
and Billing
GPRS
Backbone
·
Based on the Internet Protocol (IP)
Tunnels of data and signalling messages between GPRS Support nodes
(GSNs)
·
Intra-PLMN backbone networks are
connected by Border Gateways and an
Inter-PLMN backbone network
