notes blog about

2013-02

Cellular network

GSM

Network Structure

GSM PLMN has two main logical domains:

  1. access network - most used access networks in western Europe as of 2009 (can be deployed in parallel):
    • GERAN (GSM EDGE radio access network)
    • UTRAN (UMTS terrestrial radio access network) - HSPA can be implemented into UMTS to increase data transfer speed
  2. core network
    • circuit switched domain
    • packet switched domain
    • IP multimedia subsystem (IMS)

GPRS/UMTS architecture with the main interfaces:

The network is structured into a number of discrete sections:

See this picture for GSM communication.

BSC = Base Station Controller

PCU = Packet Control Unit

MSC = Mobile Switching Centre

HLR = Home Location Register

VLR = Visitor Location Register

AUC

EIR

SS7 = Signaling System #7

SGSN = Serving GPRS Support Node

GGSN = Gateway GPRS Support Node

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