Wireless Communication Tutorial - GSM | [pic] [pic][pic]Definition & OverviewIntroduction: Development of Mobile Phone SystemsGlobal System for Mobile Communications (GSM)GSM NetworkGSM Network AreaGSM ManualGSM Customer ServiceSelf TestCorrect AnswerGlossaryGuideFeedback[pic][pic][pic]Cellular telephony is one of the fastest growing and most in-demand radio applications. It is now used at a rate that continues to grow for all new phone users in the world. Currently, there are approximately 450 million cellular phone users worldwide, and nearly 50% of these users are in the United States. It is predicted that cellular telephone systems using digital technology will become the world\'s most common method of radio communication. It is also predicted that by the year 2005, there will be approximately 1 billion cellular phone users worldwide. Some estimates say that by the year 2000, some countries will have more mobile phones than fixed phones (see Figure 1). [pic]Figure 1. Worldwide Growth of Cellular Telephones[pic][pic]Cellular telephone service is the use of low-power transmitters (frequencies that can be reused within a geographic area). The concept of a cell-based radio service was proposed by Bell Laboratories in the United States in the early 1970s. However, it was not until 1981 that the commercial use of cellular telephone service was first proposed by the Nordic countries in the Nordic Mobile Phone Introduction. [pic]Cellular telephone systems began to be used in the United States in 1983, with the Advanced Mobile Phone Service (AMPS) system. The AMPS standard is applicable to countries in Asia, Latin America, and Oceania, creating the largest potential market for cellular phones in the world. [pic]In the early 1980s, most mobile telephone systems were analog rather than digital (as newer systems are today). This challenged analog systems to be unable to handle the increasing capacity requirements except through costly means. As a result, digital technology became popular. Digital systems have advantages over analog systems in that they have flexible signaling, lower levels of collisions, integrated transmission and switching, and the ability to grow to meet demand. Table 1 illustrates the development of mobile telephone systems worldwide. [pic]…
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