1. Operation subsystem :
The third part of a GSM system, the Operation subsystem(OSS), contains the necessary functions for network operation and maintenance.This consists of following:
● operation and maintenance center(OMC): The OMC monitors and controls all other networks entities via the O interface.
● Authentication centre(AUC): As the radio interface and mobile stations are particularly vulnerable, a separate AUC has been defined to protect user identity and data transmission.
● Equipment identity register(EIR): The EIR is a database for all IMEIs, i.e., it stores all device identifications registered for this network.
CELLULAR NETWORK : Features
• It includes cells ,clusters,frequency reuse and handovers
• Cells are base stations transmitting over small geographical areas that are represented as hexagons
• A cluster is a group of cells where no channels are reused
• The concept of frequency reuse is based on assigning to each cell a group of radio channels so that their frequencies do not interfere
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