Network Management Subsystem (NMS)

The Network Management Subsystem (NMS) is the third subsystem of the GSM network in addition to the Network Switching Subsystem (NSS) and Base Station Subsystem (BSS), which we have already discussed. The purpose of the NMS is to monitor various functions and elements of the network.
The functions of the NMS can be divided into three categories:
·                Fault management
·                Configuration management
·                Performance management

These functions cover the whole of the GSM network elements from the level of individual BTSs, up to MSCs and HLRs.

Fault management
The purpose of fault management is to ensure the smooth operation of the network and rapid correction of any kind of problems that are detected. Fault management provides the network operator with information about the current status of alarm events and maintains a history database of alarms.
The alarms are stored in the NMS database and this database can be searched according to criteria specified by the network operator.


Configuration management
The purpose of configuration management is to maintain up-to-date information about the operation and configuration status of network elements. Specific configuration functions include the  management of the radio network, software and hardware management of the network elements, time synchronization, and security operations.

Performance management
In performance management, the NMS collects measurement data from individual network elements and stores it in a database. On the basis of these data, the network operator is able to compare the actual performance of the network with the planned performance and detect both good and bad performance areas within the network.



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