HUAWEI GPRS CN-PS Solution Huawei GPRS CN-PS domain, consisting of network entities such as the SGSN, GGSN, CG, and AAA server, enables MSs to access an external PDN for packet data services and provides charging services.
The network entities are described as follows:
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SGSN
The SGSN is a functional entity that provides packet data services.
It forwards incoming and outgoing internet protocol (IP) packets to the
MSs within its service area. The SGSN provides the following functions:
- Routing and forwarding of data packets
- Encryption and authentication
- Session management
- Mobility management
- Logical link management
- Generation and output of call detail records (CDRs)
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GGSN
The GGSN is also a functional entity that provides packet data
services. It routes and encapsulates packet data between the GPRS
network and an external PDN. The GGSN provides the following functions:
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Interface to an external PDN
The GGSN serves as a gateway for an MS to access the external PDN. For the external network, the GGSN serves as a router for all equipment in the GPRS network.
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GSM/UMTS session management
The GGSN sets up a connection between an MS and the external PDN.
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Data routing and forwarding
The GGSN receives data from the MS and then forwards the data
to the external PDN. It also receives data from the external PDN and
selects a transport channel in the GPRS network based on the destination address
to forward the data to the SGSN.
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Charging for postpaid services
The GGSN generates and outputs CDRs based on the usage of the external network by the subscribers.
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Call control and service switching functions for prepaid services
For prepaid services, the GGSN serves as a service switching point
(SSP) that connects a mobile network and an intelligent network.
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