外文文獻及翻譯：3g技術(shù)-文庫吧資料
2024-11-04 11:16本頁面
【正文】 IPbased services. Together, these lay the groundwork for advanced Mobile Inter services, including personalized portals, infotainment, mobile merce and unified messaging enpassing highspeed data, superior quality voice and video and locationbased services. Making 3G a reality depends on technology developments in different areas. These include amendments to the radio interface to support wideband munications and in the core work. Supporting technologies, such as WAP and Bluetooth, also have an important role to play. This section provides a brief overview of some of the main technologies and developments involved. Ericsson supports all of these technologies and has played an active role in their development. GPRS General Packet Radio Service (GPRS) is an enhancement to existing GSM and TDMA works that introduces packet data transmission, enabling always on mobility. This means that users can choose to be permanently logged on to , Inter access and other services, but do not have to pay for these services unless sending or receiving information. When EDGE is added to GPRS, these data rates will increase up to 384kbit/s. GPRS will be implemented by adding new packet data nodes and upgrading existing nodes to provide a routing path for packet data between the mobile terminal and a gateway node. The gateway node will provide interworking with external packet data works for access to the Inter and intras. Benefits: ? Faster data speeds and always on mobility ? Almost instantaneous connection setup ? Connection to an abundance of data sources around the world, through support for multiple protocols, including IP ? A step towards full 3G services. WCDMA Wideband Code Division Multiple Access (WCDMA) is a wideband radio technique that provides far higher data rates than other radio techniques available today, up to 2Mbit/s, and highly efficient use of radio spectrum. The higher bandwidth that WCDMA provides will deliver the full potential of 3G. For example, WCDMA allows simultaneous access to several voice, video and data services at once. WCDMA is fully pliant with IMT2020 and is the air interface technology for standards in the 2GHz bandwidth (the IMT2020 core band), known as UMTS (Universal Mobile Telemunication System) in Europe and ARIB (Association of Radio Industry Businesses) in Japan. Ericsson has been at the forefront of WCDMA development. The pany delivered an experimental WCDMA system to NTT DoCoMo in Japan back in 1998. Ericsson has also set up WCDMA test systems around the world. At 2020, Ericsson announced its first family of WCDMA base stations. EDGE Enhanced Data Rates for Global Evolution (EDGE) enables GSM and TDMA operators to offer 3G services using existing work frequencies. By making changes and additions to standardization of evolutionary phases of the air interface and the backbone works, as well as the migration to ALLIP and multimedia works. cdma2020 cdma2020 is a decidedly efficient 3G standard for the delivery of high
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