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The lastest system with all one's strength which is the 3rd Generation Telecommunication(3G), and also called IMT 2000. The basic character of 3G is Intelligent signal processing technology, and it will become the basic function module. It offer voice and multimedia data communication, and something new with all kind of broadband info service compare to the last two products, such as high-speed data, low-speed image, and TV image. For example, when the customers do not use other software, the maximum transmission rate of WCDMA is 2Mbps, and when use some programs which the maximun speed is 144Kbps, hold about 5MHZ frequency bandwidth. However, there are three communication standard: WCDMA，CDMA2000, and TD-SCDMA. The IMT 2000 family made by these three members, they have problem about mutually compatible. So it is not really personal and global communication. In addition, the low utilization rate of 3G frequency spectrum, cannot use the valuable frequency spectrum resource adequately. Thirdly, the speed rate of 3G is no enough, such as single carrier only support the service from 2 to fDps. Overall, it cannot fit the needs to the development of mobile communication system in future. Therefore, It is necessary to find a way to solve current problem and also fit to the new technology (it means next generation mobile communication).
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The third generation mobile communication system (3G ), also known as IMT2000, is a fully developed system, its most basic characteristic is the intelligent signal processing technology, intelligent signal processing unit will become the basic function module, support for voice and multimedia data communication, it can provide the previous two generations of products do not offer a variety of broadband business information, for example high speed data, slow image with a television image. As WCDMA transmission rate in the user resting at a maximum of 2Mbps users, in high speed mobile is the biggest support for 144Kbps, said accounting for frequency band width of about 5MHz. However, the third generation mobile communication system communication standards there are WCDMA, CDMA2000and TD-SCDMA three major branches, composed of a IMT 2000family, member are compatible, so the existing mobile communication system is not a real sense of personal communications and global communication; moreover, the 3G spectrum utilization efficiency is relatively low, cannot make full use of the valuable resource spectrum; third,3G support rate is not high enough, such as single carrier only supports a maximum of 2~ fDps business, etc.. These disadvantages can not adapt to the needs of the development of mobile communication in the future, so seeking a can solve the existing problems, and can adapt to the future of mobile communication needs new technology (i.e., a new generation of mobile communication: next generation mobile communication ) is necessary.

The third generation mobile communication system (3G ), also known as IMT2000, is a fully developed system, its most basic characteristic is the intelligent signal processing technology, intelligent signal processing unit will become the basic function module, support for voice and multimedia data communication, it can provide the previous two generations of products do not offer a variety of broadband business information, for example high speed data, slow image with a television image. As WCDMA transmission rate in the user resting at a maximum of 2Mbps users, in high speed mobile is the biggest support for 144Kbps, said accounting for frequency band width of about 5MHz. However, the third generation mobile communication system communication standards there are WCDMA, CDMA2000and TD-SCDMA three major branches, composed of a IMT 2000family, member are compatible, so the existing mobile communication system is not a real sense of personal communications and global communication; moreover, the 3G spectrum utilization efficiency is relatively low, cannot make full use of the valuable resource spectrum; third,3G support rate is not high enough, such as single carrier only supports a maximum of 2~ fDps business, etc.. These disadvantages can not adapt to the needs of the development of mobile communication in the future, so seeking a can solve the existing problems, and can adapt to the future of mobile communication needs new technology (i.e., a new generation of mobile communication: next generation mobile communication ) is necessary。