The Future Generations of Mobile Communications Based on Broadband Access Technologies

The Future Generations of Mobile Communications Based on Broadband Access Technologies

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The Future Generations of Mobile Communications Based on Broadband Access Technologies By Abdul Naveid King . Introduction There has been an evolutionary change in mobile communications systems every decade. The first-generation (1G) in the 1970s and second-generation (2G) cellular systems in the 1980s were used mainly for voice applications and to support circuit- switched services. 1G systems were implemented based on analog technologies; however, 2G systems are digital systems such as the Global System for Mobile Communications (GSM), IS-54 Digital Cellular, Personal Digital Cellular System (PDC), and IS-95 [1]. These systems operate nationwide or internationally, and are today's mainstream systems. The data rates for users in air links of these systems are limited to less than several tens of kilobits per second. International Mobile Telecommunications 2000 (IMT-2000), which will be introduced at the beginning of the 21st century as the third-generation (3G) cellular systems can provide 2 Mb/s and 144 kb/s in indoor and vehicular environments, respectively. However, demands for higher access speeds for multimedia communications will be unlimited. In the coming century, society and the economy will greatly depend on computer communications in digital format. Almost all information will become digital data instead of real-time voice. Another trend is that communications will make human activities free of spatial and time restrictions. Mobile communications will become an essential part of our daily life, yet be transparent much like the air itself. It will be everywhere and commonplace, but people will not be aware of it. Key to the Future generations of mobile communications are multimedia communications, wireless access to broadband fixed networks, and seamless roaming among different systems. In future generations include the fourth (4G) and fifth generations (5G), and 4G is used, in a broad sense, to include several systems; not only cellular phone systems, but also many new types of communication systems such as broadband wireless access systems, millimeter-wave LANs, intelligent transport systems (ITSs), and high altitude stratospheric platform station (HAPS) systems. When 4G systems are used in a narrow sense as cellular systems, they will be specified as 4G-cellular. Generations of mobile communications. . It is very clear that they have to satisfy the demands of high data rate, high mobility, and seamless coverage. However, it is very hard to give a clear vision of future- generation systems. In principle, it is difficult to realize the system, which has both a high data rate and high mobility. In addition to this, system performance (e.g., cell size and
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transmission data rate) greatly depends on frequency bands. Taking these technical problems into account, future systems will include several different systems. Some will have high performance in providing high data rates, others in service coverage or high mobility. If these systems are integrated with other systems, there will be possible uses to enjoy
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This note was uploaded on 05/20/2010 for the course MOBILE COM 08123111 taught by Professor Abdulnaveid during the Spring '10 term at École Normale Supérieure.

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The Future Generations of Mobile Communications Based on Broadband Access Technologies

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