Tài liệu Next Generation Mobile Systems 3G and Beyond doc

[...]... meanings Next- generation mobile system This refers to the whole (beyond 3G) mobile communication system in its entirety, including the whole technology “value chain” of the wireless ecosystem from the service platform, through the core and access networks to the user terminal and applications Next- generation mobile network This refers to a subset of the Next- generation Mobile System” defined above The Next- generation. .. current 3G technologies and allowing some educated speculation on future directions beyond 3G Next Generation Mobile Systems Edited by Dr M Etoh  2005 John Wiley & Sons, Ltd 2 A VISION FOR THE NEXT GENERATION In this book, we do not focus only on new radio access networks We anticipate that many other technologies, such as backbone networks, terminal software, and security systems will combine and synergistically... Network (RAN) and the XG mobile system The 4G RAN part is clearly an important component of XG mobile systems, but it is insufficient to define it We will discuss some existing and emerging technologies that we think are necessary for our definition of Next Generation in this book NTT DoCoMo, Inc has created a research lab specifically to work on next- generation mobile system technology issues and to help... become part of the foundation for mobile systems in the post 3G era Each chapter covers a different technology area The current technology base is summarized, and the demands for new functionality and how these demands stress current 3G systems is discussed Where appropriate, we employ existing standards as a tool to describe the current status of the industry, and emerging standards as a tool to anticipate... reliable security If this increase in value is to be maximized, next- generation mobile systems will also need to be developed (and therefore defined) from the user perspective (Mohr 2002; Next Generation Mobile Systems Edited by Dr M Etoh  2005 John Wiley & Sons, Ltd 4 EVOLUTION OF MOBILE NETWORKS AND SERVICES Tachikawa 2003a), where services and applications (more than technology) define success The combination... networks, and these local networks will interoperate with the global mobile networks This description is typical of the functionality and ubiquity envisioned for next- generation mobile systems The evolution of each network generation enriches mobile applications, and the applications bring the generation differences into very sharp focus This is as it should be if we are to consider network generations... shows the generations, their transport technologies, and applications.1 In Figure 1.1, we summarize major functionalities of each generation as follows 1G: Basic mobile telephony service 2G: Mobile telephony service for mass users with improved ciphering and efficient utilization of the radio spectrum Figure 1.1 Generation of mobile networks 1 The technical distinctions and definitions of 1G 3G mobile networks... et al (2001a) and Tachikawa (2002a) EVOLUTION OF MOBILE NETWORKS AND SERVICES 5 2.5G: Mobile Internet services 3G: Enhanced 2.5G services plus global roaming, and emerging new applications (see the next section) The first generation (1G) is based on analog cellular technology, such as the American Mobile Phone Service (AMPS) in the United States and the NTT system in Japan The second -generation (2G)... compatible The functional leap implemented by 3G networks that differentiates them from 2G networks is also the Internet service connection In this sense, it could be argued that 2.5G mobile networks and 3G mobile networks fall into the same generation The 3G mobile networks, however, provide significantly greater bandwidth and can therefore accommodate new mobile services, such as enhanced multimedia... browsing with some limited and low-resolution graphics In 2.5G and 3G networks, the JPEG standard is adopted and is commonly used in addition to the GIF standard TFT displays with 262,144 colors, 2.4-in 240 × 320 pixel resolution are typically used on 2.5G and 3G terminals, which is creating a convergence of mobile content and Internet content Location-dependent Services: DoCoMo launched a location-dependent . y0 w1 h2" alt="" Next Generation Mobile Systems 3G and Beyond Next Generation Mobile Systems 3G and Beyond Edited by Minoru Etoh DoCoMo Communications. for the Next Generation 1 1 Evolution of Mobile Networks and Services 3 1.1 TheEvolutionofMobileNetworks 4 1.2 TrendsinMobileServices 6 1.3 WhyNext -generation( XG)MobileSystems?