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GPRS : General Packet Radio System - page 3 / 20

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Networks: L17

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upgrade to Base Stations required :

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software upgrade to Base Transceiver Stations and Controllers

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additional hardware module – a Packet Control Unit (PCU)

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to manage the packet transfer between mobile devices and GPRS network

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also supports data frame retransmission and other GPRS protocol functions

new network components :

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Serving GPRS Support Node (SGSN)

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interacts with Home Location Register (HLR) to get subscriber profile information

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directly connected to the Base Station

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controls access, tracks user mobility and implements some security functions

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Gateway GPRS Support Node (GGSN)

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gateway to external data networks

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e.g. Internet, private intranets, X25 networks etc.

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provides services for authenticating external network access, Quality of Service

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provides tunnelling for access to Virtual Private Networks

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supports roaming by routing incoming traffic to the appropriate SGSN where the user is located

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