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GSM Interview Questions and Answers

1
What is GSM?
  • Short form of Global System for Mobile Communications, is a wireless network system
  • A standard for digital cellular mobile communications
  • International roaming arrangements are enabled among mobile network operators, by providing the subscribers to use their personal mobile phones anywhere in the world.
  • GSM is considered as second generation mobile, as signaling and speech channels are digital
  • The carriers can be replaced without replacing mobile phones.
  • The ubiquity of GSM implementations is also enabling the switching between network operators, who can choose equipment from many GSM equipment vendors.
  • GSM pioneered low cost SMS implementation
  • The GSM standard includes a worldwide emergency telephone number feature.
2
I know that the main function of bts is to air interface signaling. But why?

mobile station is normally mobile in nature which is an
advantage over pstn network . and in order to provide
connection to mobile station we use radio resource (air)...
in order to provide interface between mobile and bss . bts
is used.. a bts is responsible to cover a small geographical
area called cell...

3
Explain: DRX – TRX

DRX:

  • DRX is referred as driver receiver.
  • DRX performs the transmission and reception of signals
  • Sends and receives the signals to or from higher network entities, as in base station controller in mobile telephony

TRX:

  • The transceivers allows to serve several frequencies and different sectors of the cell
  • Sends and receives signals from / to higher network entities.
4
Does Extended Cell have any impact on the system? If yes, what?
  • The cell radius could be double or even more, based on the antenna, type of terrain and timing advance.
  • Indoor coverage is supported by GSM and could be achieved with the usage of picocell base station or an indoor repeater along with distributed indoor antennas.
5
What is the maximum data rate supported by a GSM system?
  • The maximum data rate supported by a GSM system is 9.6 kbps.
  • However there are extensions to GSM standard to improve throughput.
  • GPRS is one of the extended GSM service.
  • The extended standards of GSM allows theoretical data rates on the order of 114 Kbit/s, but with throughput closer to 40Kbit/s in practice.
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