Introduction to GPRS and EDGE: Technology, Operation, and Services by Lawrence Harte

Author:Lawrence Harte [Harte, Lawrence]
Language: eng
Format: azw3
Publisher: UNKNOWN
Published: 2017-03-24T04:00:00+00:00

GPRS and EDGE/EGPRS Network

GSM networks consist of base stations (cell site radio towers), communication links, switching center(s) and network databases. All of these are used to create links to public telephone and data networks (e.g. the Internet).

The GPRS system adds packet radio and packet data switching parts to a GSM system. In the GSM part, the MSC coordinates the overall allocation and routing of calls throughout the wireless system. Inter-system connections can link different wireless network systems to allow wireless telephones to move from cell site to cell site and system to system. In the GPRS part, a Packet Control Unit (PCU) coordinates the assignment of radio packets and GPRS Support Nodes (GSNs) receive and forward data packets toward their destination.

The GPRS system can be divided into a base station subsystem (BSS), a network and switching system (NSS), and an operation and maintenance subsystem (OMS). The radio parts of the GPRS network are contained in the BSS. The switching, databases, and interconnection parts are contained in the NSS. The OMS contains the necessary system to monitor and diagnose system operation.

Figure 1.16 shows a simplified functional diagram of a GPRS network. This diagram shows that the GPRS network is an addition to the circuit switched GSM system. However, this voice and a packet switched data systems that share a common radio access network. This diagram shows that the Base Station (BTS) contains a radio transceiver (radio and transmitter) that converts the radio signal into a data signal (data and digital voice) that can transfer through the network. The BTS is connected to a base station controller (BSC) that coordinates the radio channel assignments. In this example (there are other possible configurations), the packet data at the BSC/PCU is routed to a serving GPRS service node (SGSN) and the SGSN is connected to a gateway GPRS service node (GGSN). The circuit switched digital data at the BSC is routed to the mobile switching center (MSC) for connection to the public telephone network or to a data network through an inter-working function (IWF).

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