Evolution of Wireless Mobile Telecommunications Essay

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The evolution of wireless mobile telecommunications. Intro- GSM (Global System for Mobile communications) is an open, digital cellular technology used for transmitting mobile voice and data services. It uses a variation of Time Division Multiple Access TDMA and is the most widely used of the three digital wireless telephone technologies with other technologies, is part of the evolution of wireless mobile telecommunications that includes High-Speed Circuit-Switched Data HCSD, General Packet Radio System GPRS, Enhanced Data GSM Environment EDGE. GSM supports voice calls and data transfer speeds of up to 9.6 Kbit/s, together with the transmission of SMS (Short Message Service). GSM operates in the 900MHz and 1.8GHz bands in Europe and the 1.9GHz and 850MHz bands in the US. Terrestrial GSM networks now cover more than 80% of the world's population. Roaming readiness and fraud prevention are two major advantages from this technology. Paragraph 1- A GSM network is composed of several functional entities, whose functions and interfaces are specified. The GSM network can be divided into three broad parts. The Mobile Station is carried by the subscriber. The Base Station Subsystem controls the radio link with the Mobile Station. The Network Subsystem, the main part of which is the Mobile services Switching Centre (MSC), performs the switching of calls between the mobile users, and between mobile and fixed network users. The MSC also handles the mobility management operations. Not shown is the Operations and Maintenance Centre, which oversees the proper operation and setup of the network. The Mobile Station and the Base Station Subsystem communicate across the Um interface, also known as the air interface or radio link. The Base Station Subsystem communicates with the Mobile services Switching Centre across the A interface. A GSM network consists of the following

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