【正文】 urist information bureau at the same time. 3G At work 3G will not just support the needs of businesspeople who travel a lot, but will also help new, flexible working practices, such as homeworking and remote access to corporate networks outside traditional working hours. Businesspeople are often highvolume airtime users, so they represent a big opportunity for mobile operators. Here are some examples: At work you receive a message from your smart refrigerator at home. The message tells you that certain items need restocking and an order has already been prepared for the local grocery store, which you can approve, so that your groceries are ready to collect on the way home.You are on the road, and urgently need to discuss a draft presentation with a number of colleagues back in the office. Pulling into a service station, you use your 3G device to hold a telephone conference with your colleagues and, at the same time, you can all view the draft presentation and make changes on line.A maintenance engineer is repairing some equipment on a client39。s premises and hits a problem. Using his 3G device, he contacts his department and downloads a demonstration video that guides him through the repair process.TECHNOLOGY3G brings together two powerful forces: wideband radio munications and IPbased services. Together, these lay the groundwork for advanced Mobile Internet 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 network. 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. GPRSGeneral Packet Radio Service (GPRS) is an enhancement to existing GSM and TDMA networks that introduces packet data transmission, enabling always on mobility. This means that users can choose to be permanently logged on to , Internet 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 networks for access to the Internet and intranets. 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. TDSCDMAAll called Time DivisionSynchronous CDMA , this standard is formulated by mainland China alone the 3 G standard. On June 29, 1999, the China tele science and technology and telemunications research institute (Datang Tele) to the ITU, but technical invention father put forward in Siemens AG. TDSCDMA has the characteristics of low radiation, known as the green 3 G. This standard will intelligent wireless, synchronous CDMA and software radio today the international leading technology into which, in spectrum use efficiency, the business support for flexibility, frequency flexibility and cost, and other aspects of the unique advantages. In addition, because of the huge market in China, the standard by the major telemunications equipment manufacturer to the attention of the world, more than half of the equipment factory now announced that can support TDSCDMA standards. This standard is made after of the intermediate links, and the generation of directly to the 3 G transition, so it is suitable to GSM system to 3 G to upgrade. Military munication network is the core of TDSCDMA task. 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 IMT2000 and is the air interface technology for standards in the 2GHz bandwidth (the IMT2000 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 2000, 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 network frequencies. By making changes and additions to standardization of evolutionary phases of the air interface and the backbone networks, as well as the migration to ALLIP and multimedia networks. CDMA2000CDMA2000 is a decidedly efficient 3G standard for the delivery of high bandwidth data and high capacity voice services. The evolution of the cdma2000 standard will enable mobile systems to offer data throughputs of 2 Mbit/sec and beyond. The higher bandwidth that cdma2000 provides will deliver the full potential of 3G. For example, cdma2000 also allows simultaneous access to several voice, video and data services at once.CDMA2000 is fully pliant with IMT2000 requirements for 3G. CDMA2000 will be implemented in the existing frequenc