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what is GSM technology

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April 19, 2013 10:16:37 AM

More about : gsm technology

May 1, 2013 12:59:24 AM

GSM : GSM stands for Global System for Mobile Communications. Just like computers, mobile phones have evolved over time. There were first generation mobile phones in the 70's, there are 2nd generation mobile phones in the 80's and 90's, and now there are 3rd gen phones which are about to enter the Indian market. GSM is called a 2nd generation, or 2G communications technology.

Now, GSM makes use of two principles. The first called Time division Multiplexing is very simple. Let's say that one of your friends possesses the new and sleek Apple's IPhone. Everyone wants to try a hand at your new accessory. What do you'll do? You lend it to your friend Tim for sometime, then you let John listen to music on it, then you let Linda check her e-mails on it, and finally you let Nancy search on google. So what did you do ? You allowed each of your friends to share you IPhone for sometime. That is, you allowed you IPhone to be shared in time.

On the same lines, in GSM, the radio frequency say 890 Mhz is shared by different users in time. This means if user A, B, C and D all talk at the same time. You assign the 890 Mhz frequency to A for some time and allow him to talk, then you assign 890 band to B for sometime to speak, then to C , and finally to D, before coming back to A. So the process continues in a round robin fashion, as long as A, B, C, and D want to talk. This way many users talk at same time on the same frequency. This has to be done, because as we now frequency or Bandwidth is a scarce resource and is not available in plentiful, so it must be shared.

Now the second principle that GSM uses is Frequency Division Multiplex. In Frequency Division Multiplex, users A, B, C and D, all use different frequency say 890, 900, 910 , 920 for their respective communications. A very good example of this is Radio broadcasting. Because all the radio operators like Rad FM, Go FM, Radio Mirchi want to operate in the same area, they use different frequencies for communication 91.0FM, 93.5FM, 94.6 FM, 108FM. So to listen to different communications, you have to tune in the receiver set to different frequencies.

Now, GSM uses a combination of TDMA and FDMA. This means that users A and B are not only sharing the channel in time but also frequency. This means that user A is on the channel 890Mhz for 2 seconds, then jumps to 900Mhz channel for the next to seconds, then jumps to 910Mhz for the next 2 seconds and so on... Thus, each user is uses a different frequency at different time slots. This is called Frequency Hopping.
May 7, 2013 10:48:52 PM

GSM or Global System for Mobile Communication represents one of the most popular, successful and widely used digital mobile telecommunication systems used across the Globe. As per the latest data, India has added more than 6 Million GSM subscribers in the month of March, 2012 taking the total GSM subscriber base to more than 650 Million in India alone. This is happening even with the advent of 3G, UMTS and other cellular technologies.

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May 10, 2013 3:06:35 AM

GSM networks consist of thee major systems: SS, which is known to be The Switching System; BSS, which is also called The Base Station; and the Operation and Support System for GSM networks.
February 25, 2014 11:03:50 PM

GSM is actually one of the most successful and wide used digital systems. I've been using GSM. It is most suitable for large volumes of data and complex digital work. According to industry analysis reports in the field of mobile technology it is ranked 3rd in Europe
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