Network access function:
Point to point data transfer, registration of MS with packet
data protocols, radio resources for MS communication and
charging information about packet transmission, is provided by
this function.
Packet routing and transfer function:
Routing of data between an MS and destination, conversion of
GPRS address to external address and forwarding of packets
between an MS and GGSN, is provided by this function.
Logical link management function: The communication between an MS and the GSM network is
maintained by it.
Radio resources management function: Radio communication paths are allocated by it.
Mobility management function:
Current location of an MS is kept by it. When an MS is entered
to a new area, all routing and location in formations are also
updated by it.
Network management function: If provides mechanisms to support network functions
related to GPRS.
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