Mobiles Essay

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GSM, CDMA, TDMA, GPRS & EDGE |GSM - 2G (European standard) | |GSM (Global System for Mobile communication) is a digital mobile telephone system that is widely used in Europe and other parts | |of the world. GSM uses a variation of time division multiple access (TDMA) and is the most widely used of the three digital | |wireless telephone technologies (TDMA, GSM, and CDMA). GSM digitizes and compresses data, then sends it down a channel with two | |other streams of user data, each in its own time slot. It operates at either the 900 MHz or 1800 MHz frequency band. | |GSM is the de facto wireless telephone standard in Europe. GSM has over 120 million users worldwide and is available in 120 | |countries, according to the GSM MoU Association. Since many GSM network operators have roaming agreements with foreign | |operators, users can often continue to use their mobile phones when they travel to other countries. | |American Personal Communications (APC), a subsidiary of Sprint, is using GSM as the technology for a broadband personal | |communications service (PCS). The service will ultimately have more than 400 base stations for the palm-sized handsets that are | |being made by Ericsson, Motorola, and Nokia. The handsets include a phone, a text pager, and an answering machine. | |GSM together with other technologies is part of an evolution of wireless mobile telecommunication that includes High-Speed | |Circuit-Switched Data (HCSD), General Packet Radio System (GPRS), Enhanced Data GSM Environment (EDGE), and Universal Mobile | |Telecommunications Service (UMTS). | |GSM Tutorial

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