Making a CALL? - Know the backend process

        Cellphone tower

Do you know...What actually happens when you make a call using a sim.

What is a SIM?

Subscriber Identity Module

        SIM (Subscriber Identification Module or subscriber identity module) is actually an integrated circuit which is securely used to store International Mobile Subscriber Identity (IMSI) number which will be provided by your Telecom provider.

Backend process when you make a call from your mobile phone:         Base transceiver station

The phone's signal will go to a tower which is called as base transceiver station, then the signal will be transmitted to something called as base station controller (BSC) via cables and then the signal will go to MSC.

MSC means Mobile Switching Centre.

Data such as name, address, whether the phone is recharged or not and also under which tower the one who makes a call is located will be stored/processed in the MSC. Then it goes to Bio MSC where the receiver's data such as the other end (receiver)person’s mobile phone is switched on or off, whether they have activated the incoming call facility and if they have activated the call forwarding option the above said operation again starts from the beginning and bounce from the receiver mobile to the targeted person(to whom its forwarded).

If not (no forwarding option is enabled)the data goes to receiver's side MSC and the reverse of process takes place..

 By reading this post you may get a basic knowledge about the process which takes place while you “make a call”. If the receiver's bio msc signal is weak then the the disturbances such as voice breaking and cross talk occurs.

This is a bit long process in the Telecom. Because of this long process sometimes we used to hear certain sounds before the call gets connected.

Range of cell towers:

            How much range a tower can cover is known as cell (basically, a telecom tower covers an area of several kilometers). A number of cells is known as cellular network. Only because of these reasons its been called cell phones.

          These cell tower ranges are arranged in different patterns like circle,square,hexagon. “The circular pattern is not used because of their very poor signal”.       The hexagon pattern is used in most of the places because it covers more area. If there is any obstacle between phone and tower for example if you are in a subway or underground or in a fully insulated/sealed building, the mobile signal will be weak.

    For better understanding of cell we can take crowded area/city like Chennai, in a city there will be a lakh of people trying to make a call at the same time and the signals may coincide if we keep a long-range tower and at the same time Telecom can't handle many call requests at a time. Because of this reason short range towers are introduced and are being in use nowadays.


                                          Truth and lies

        Some of us would have thought that when we make a call from our mobile the satellites are being used for these processes, but that is not true. Even for international calls the signal has been transmitted through cables but not through satellites. During the early days, when mobile phones were introduced, a long-range tower can cover a range of about 50kms and it can handle only about 80 to 100 calls. After an increase in mobile phone usage, towers range were decreased and the number of towers is increased so that ultimately the calling efficiency could be increased.

What makes the tower signal weak:

 In certain situations, the voice will break even if there is a good signal it could be because of two reasons

1. If the caller or receiver is in a moving situation, the mobile signal will be shifting from a tower to another tower nearby. If we are moving so fast while on a call there would be certain issues while the call gets shifted from one tower to another. To get a better signal while traveling we should slow down our speed a little bit.     While moving our mobile smartly calculates which nearby tower has better strength and connects to it while on a call/while we use the internet.

2. If we are in a crowded place, the tower can't handle much call requests at a time, because of this the signal will drop significantly

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