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h3.cjk { font-family: “Noto Sans CJK SC Regular”; }h3.ctl { font-family: “FreeSans”; }h2.cjk { font-family: “Noto Sans CJK SC Regular”; }h2.ctl { font-family: “FreeSans”; }p { margin-bottom: 0.25cm; line-height: 120%; }a:link { }CASESTUDY ON GSMINTRODUCTION:If you are inEurope or Asia and using a mobile phone, then most probably you areusing 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.

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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.FEATURES OF GSM: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 servicesCOMPONENTS OF GSM:A GSM network comprises of manyfunctional units.

These functions and interfaces are explained inthis chapter. The GSM network can be broadly divided into:The Mobile Station (MS) The Base Station Subsystem (BSS) The network swtiching subsystem(NSS) The Operation support subsystem (OSS) Additionalcomponents are:Home Location Register (HLR) Visitor Location Register (VLR) Equipment Identity Register (EIR) Authentication Center (AuC) SMS Serving Center (SMS SC) Gateway MSC (GMSC) Chargeback Center (CBC) Transcoder and Adaptation Unit (TRAU) BLOCKDIAGRAM OF GSM:SERVICESPROVIDED BY GSM: GSM offers three basic types of services:Telephony services or teleservices Data services or bearer services Supplementary services Teleservices VoiceCalls Videotext and Facesmile Short Text Messages BearerServices Data services or Bearer Services are used through a GSM phone. to receive and send data is the essential building block leading to widespread mobile Internet access and mobile data transfer.

GSM currently has a data transfer rate of 9.6k. New developments that will push up data transfer rates for GSM users are HSCSD (high speed circuit switched data) and GPRS (general packet radio service) are now available.SupplementaryServices Conferencing Call Waiting Call Hold Call Forwarding Call Barring Number Identification Advice of Charge (AoC) Closed User Groups (CUGs) Unstructured supplementary services data (USSD) CONCLUSION:Thecommunication development and the increase of living standard ofpeople are directly related to the more use of cellular mobile.Cellular mobile radio-the high end sophisticated technology thatenables every one to communicate anywhere with anybody.

The mobiletelephony industry rapidly growing and that has become backbone forbusiness success and efficiency and a part of modern lifestyles allover the world.In this thesis work we have tried to giveand over view of the GSM system. We hope that we gave the generalflavor of GSM and the philosophy behind its design. The GSM isstandard that insures interoperability without stifling competitionand innovation among the suppliers to the benefit of the public bothin terms of cost and service quality.The features andbenefits expected in the GSM systems are superior speech quality, lowterminal, operational and service costs, a high level security,providing international roaming support of low power hand portableterminals and variety of new services and network facilities. In nearforth coming days, the third generation mobile telephony becomesavailable whole over the world, which will give the facility ofvideoconference in mobile telephone.