3G-based phone
Wireless communications have changed over the last decade, evolving from the first generation of analog cellular service, to the second generation of digital cellular service. Mobile communication systems have gone through a few generations. The second-generation (2G) system provides circuit-switched voice and data services. The next generation (2.5G) system provides low-rate packet-switched data service of up to 64 Kbps. However, as the demand for wideband wireless data transmission becomes more and more significant, and since cellular operators foresee a great business opportunity in fulfilling the subscribers' request for the wireless wide-band transmissions, a third generation of cellular networks is under way of being achieved and implemented. The third-generation mobile communication system (3G) provides a higher data rate of up to 2 Mbps, while making more efficient bandwidth use. Third generation wireless communications, such as wideband code division multiple access time division duplex (WCDMA-TDD) systems, will support not only voice service, but also a wide range of broadband services, such as video and Internet traffic. 3G networks comprise a core network including at least one service serving node (or SSN) connected to a radio access network (RAN) including radio network controllers (or RNCs) linked to emission/reception base station, such as Node-B in case of UMTS network, and controlling the radio resources and therefore the cells in which user equipments are localized. Typical 3G systems include packet-based transmission of digitized voice, data and video. 3G networks encompass a range of wireless technologies including Code Division Multiple Access ("CDMA"), Universal Mobile Telecommunications Service ("UMTS") Wide-band CDMA ("WCDMA") and others. In third generation cellular systems, where UMTS FDD and UMTS-TDD spectra are both allocated, continuous (FDD) and discontinuous (TDD) transmissions are employed. Physical channel data in a 3G system is processed in words having a pre-defined bit size, which is currently specified as 32 bits per word.
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