GPRS Interfaces
Different interfaces are used for routing between network nodes in GPRS. *Um interface provides communication between MS and BSS. *Gb interface provides connection between BSS and SGSN. *Gn interface provides connection between SGSN and GGSN within the same GPRS network. *Gp interface provides connection between SGSN and GGSN when they are in different GPRS network. *Gi interface provides connection between GGSN and external networks. *Gs interface provides communication between MSC and SGSN. GPRS functional Groups The functions which are defined in GPRS are following. *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, ...

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