Image:Gsm network.png
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This diagram shows the simplified structure of a GSM network.
It shows that the network is divided into three main sections (although there are others, such as the operations and maintenance network and the intelligent network subsystem).
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The BSS
The Base Station Subsystem is shown containing the BSC and the BTS connected together on the A-bis interface. The PCU is also shown connected to the BTS although the exact position of this depends on the vendor's architecture.
The BSS is connected by the Air Interface or Um to the mobile. It is connected by the A interface to the NSS.
The NSS
The Network and Switching Subsystem is shown containing the MSC connected via the SS7 network to the HLR. The AUC and EIR, although technically separate functions from the HLR are shown together since combining them is almost standard in all Vendor's networks.
The NSS is connected by the A interface to the BSS. It has a direct connection to the PSTN from the MSC. There is also a connection to the Packet Core (called the Gs) although this is optional and not always implemented.
The GPRS Core Network
The GPRS Core Network shown here is simplified to just have the SGSN (connected to the BSS by the Gb interface) and the GGSN. The two are connected together by a private IP network called the GPRS backbone shown as the Gn Reference Point.
About the diagram
Missing image Heckert_GNU_white.png | Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. Subject to disclaimers. |
The diagram was drawn by me and I hereby donate the copy on Wikipedia to the Wikipedia project Mozzerati 06:40, 2004 May 21 (UTC)~
The Missing image
Gsm_network.fig
original of the diagram
in xfig format is also available for easy editing.
Template:Ifc
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