3g技術(shù)中英文文獻(xiàn)-文庫(kù)吧
2025-09-10 09:33 本頁(yè)面
【正文】 ume 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 4 your 3G device to hold a tele meeting 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. TECHNOLOGY 3G brings together two powerful forces: wideband radio munications and 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. Erics son 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 5 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 voic
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