Global System For Mobile Communication Study Material Download
- Global System For Mobile Communication Study Material Download Pdf
- Global System For Mobile Communication Study Material Download 2019
Global system for mobile communication (GSM) is wide area wireless communications system that uses digital radio transmission to provide voice, data, and multimedia communication services. A GSM system coordinates the communication between a mobile telephones (mobile stations), base stations (cell sites), and switching systems. Each GSM radio channel is 200 kHz wide channels that are further divided into frames that hold 8 time slots. GSM was originally named Groupe Special Mobile. The GSM system includes mobile telephones (mobile stations), radio towers (base stations), and interconnecting switching systems. The GSM system allows up to 8 to 16 voice users to share each radio channel and there may be several radio channels per radio transmission site (cell site).
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Figure 1.1 shows an overview of a GSM radio system. This diagram shows that the GSM system includes mobile communication devices that communicate through base stations (BS) and a mobile switching center (MSC) to connect to other mobile telephones, public telephones, or to the Internet. This diagram shows that the MSC connects to databases of customers. This example shows that the GSM system mobile devices can include mobile telephones or data communication devices such as laptop computers.
Figure 1.1: Global System for Mobile Communications (GSM)
- Global System for Mobile Communications: The Global System for Mobile Communications (GSM) is a second generation (2G) standard for mobile networks. In the early 1980s, a group was formed by the European Telecommunications Standards Institute (ETSI) to develop a digital mobile communication system. Aptly named Groupe Speciale Mobile (GSM), its.
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The GSM specification was initially created to provide a single industry standard for European cellular systems. In 1982, the development of the GSM specification began and the first commercial GSM system began operation in 1991. In 2004, there were more than 1.046 billion GSM subscribers in 205 countries and...
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What is GSM?
Global System For Mobile Communication Study Material Download Pdf
If you are in Europe or Asia and using a mobile phone, then most probably you are using GSM technology in your mobile phone.
GSM stands for Global System for Mobile Communication. It is a digital cellular technology used for transmitting mobile voice and data services.
The concept of GSM emerged from a cell-based mobile radio system at Bell Laboratories in the early 1970s.
GSM is the name of a standardization group established in 1982 to create a common European mobile telephone standard.
GSM is the most widely accepted standard in telecommunications and it is implemented globally.
GSM is a circuit-switched system that divides each 200 kHz channel into eight 25 kHz time-slots. GSM operates on the mobile communication bands 900 MHz and 1800 MHz in most parts of the world. In the US, GSM operates in the bands 850 MHz and 1900 MHz.
GSM owns a market share of more than 70 percent of the world's digital cellular subscribers.
GSM makes use of narrowband Time Division Multiple Access (TDMA) technique for transmitting signals.
GSM was developed using digital technology. It has an ability to carry 64 kbps to 120 Mbps of data rates.
Presently GSM supports more than one billion mobile subscribers in more than 210 countries throughout the world.
GSM provides basic to advanced voice and data services including roaming service. Roaming is the ability to use your GSM phone number in another GSM network.
GSM digitizes and compresses data, then sends it down through a channel with two other streams of user data, each in its own timeslot.
Why GSM?
Listed below are the features of GSM that account for its popularity and wide acceptance.
Improved spectrum efficiency
International roaming
Low-cost mobile sets and base stations (BSs)
High-quality speech
Compatibility with Integrated Services Digital Network (ISDN) and other telephone company services
Support for new services
GSM History
The following table shows some of the important events in the rollout of the GSM system.
Global System For Mobile Communication Study Material Download 2019
| Years | Events |
|---|---|
| 1982 | Conference of European Posts and Telegraph (CEPT) establishes a GSM group to widen the standards for a pan-European cellular mobile system. |
| 1985 | A list of recommendations to be generated by the group is accepted. |
| 1986 | Executed field tests to check the different radio techniques recommended for the air interface. |
| 1987 | Time Division Multiple Access (TDMA) is chosen as the access method (with Frequency Division Multiple Access [FDMA]). The initial Memorandum of Understanding (MoU) is signed by telecommunication operators representing 12 countries. |
| 1988 | GSM system is validated. |
| 1989 | The European Telecommunications Standards Institute (ETSI) was given the responsibility of the GSM specifications. |
| 1990 | Phase 1 of the GSM specifications is delivered. |
| 1991 | Commercial launch of the GSM service occurs. The DCS1800 specifications are finalized. |
| 1992 | The addition of the countries that signed the GSM MoU takes place. Coverage spreads to larger cities and airports. |
| 1993 | Coverage of main roads GSM services starts outside Europe. |
| 1994 | Data transmission capabilities launched. The number of networks rises to 69 in 43 countries by the end of 1994. |
| 1995 | Phase 2 of the GSM specifications occurs. Coverage is extended to rural areas. |
| 1996 | June: 133 network in 81 countries operational. |
| 1997 | July: 200 network in 109 countries operational, around 44 million subscribers worldwide. |
| 1999 | Wireless Application Protocol (WAP) came into existence and became operational in 130 countries with 260 million subscribers. |
| 2000 | General Packet Radio Service(GPRS) came into existence. |
| 2001 | As of May 2001, over 550 million people were subscribers to mobile telecommunications. |