Indian Govt Okays Number Portability in 4 Metros

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hi friends,i 'm in the final year diploma engg of EXTC engg and this news is a great topic to discuss on.does anyone have any idea how the switching of operators without the change in the user's mobile number will take place . I'm as good as a newbie to this switching concept but this is a gr8 opportunity for me to get associated with new concepts of telecomm and i feel you all people would also scratch your head to give a thought on this.i would like to ask some questions pls help me in finding the answers to them :
1) the new gen mobile phones operate on the TDM concept where in the users can be alloted the same frequency as the users are switched in different time slots.if this is so. suppose 2 such users are subscribed to the same operator and if 1 of the user switches to another operator then what is done exactly ?
a. the user frequency is handed over to new operator which will modulate a different carrier.
b.or is it that the subsriber line is handed over to the new operators network?
c. or will there be a dirct merging of the different operator's switching systems ?
this may sound senseless but as far as my concepts are concerned this is my way of thinking . now its your turn friends .

 

[johankj]

TDM=Time Division Multiplexing, which is how GSM works. Different operators have to build their own network, and when you're with one operator, you can't use another operators network. The exception to this is emergency numbers, which will work on a GSM phone even without a SIM card. In general, you receive a new SIM card when you switch operator. The SIM card holds the information needed to authenticate with an operators network. The frequency, modulation, and the whole shebang remains the same between operators, in fact, with most phones you can search them up, but probably not connect.

GSM does not have line cards, in the traditional POTS sense. Phones have a unique key, and so does the SIM card. This is how the operator keeps track of its subscribers.

The connection between one operator to another is done in a central switching system, yes. Operators switching systems a connected together.

But then there is roaming, but that is a whole other story.