Base Station System

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MTNL BSS ( Shadipur


It houses the BSS, which is responsible for controlling GSM mobile operations in the cell at or near shadipur & karol bagh area.

They have installed components and other subsytem from reputed firms like Huawei , Alcatel and Motorola.

These high performance systems do all necessary operation so that order and stability is maintained throughout the system.


What is GSM ?


The Global System for Mobile communications is a digital cellular communications system.

It was developed in order to create a common European mobile telephone standard but it has been rapidly accepted worldwide.

GSM was the brainchild of Bell labs ( US ).


GSM Multiplex structure


GSM works on a combination of FDM and TDM for providing multiple access.

 GSM utilizes a cellular concept, in which a geographical area is divided into planned radio cells .

It Provides one BTS per cell with which a mobile can make contact.

The cell radius can vary according to user density from 300 mtrs to 35 Kms.


Mobile station(MS)


It represents the terminal equipment used by the wireless subscriber supported by the GSM Wireless system.

SIM (Subscriber identity Module) - It is basically a removable smart card .It includes a microprocessor with all the subscriber-related information .  

At MTNL MS can be any cellular device that uses SIM card.

Each BTS controls many MS’s.