关键词：第三代移动通信 , WCDMA , CDMA-2000 , TD-SCDMA ,
3G Mobile Communication Technology
Development and Smooth Transition
Nowadays, the most arresting accomplishment are mobile communication , multimedia communication services and IP net which are rapidly developing . With the inverse proportion of these services highly increased , the disadvantage and localization of second generation communication system are more and more evident . Demand of market and technology drive us to quest for and study new communication system, which is the third mobile communication system . It is constitute by the satellite Mobile Telecommunication Network and Land Mobile Network. It can satisfy the need of various customer density and high speed move customer of city and side far the area and come into being a stereoscopic communication network to cover with anywhere of the world .It can offer additional services like high speed packet switched data transmission and other applications than speech, such as data and video . For mobile communication system now , additional standards are being developed to offer services which meet the requirements of next generation mobile communications. Now , the standards of 3G are under development . The 3G network of many countries are under testing as well as our country . It will be commercial before 2008 expectably in our China .
Because the unripe of standards , the development of 3G is difficult . Some problems appeared in the use of 3G network . By these experience , we know that the smooth transition from 2G to 3G is the most important .
This paper gives an overview of the elements of mobile communication , second mobile communication , technique of third mobile communication and the smooth transition from 2G to 3G convenient communication of “anybody , anytime , anywhere ” will finally be implemented .
Key words: 3G , WCDMA , CDMA-2000 , TD-SCDMA