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019第三代移动通信技术发展探讨及平滑过渡  论文
双击自动滚屏 文章来源:   发布者:jsjlw99   发布时间:2009/7/8 17:04:12   阅读:1804
中文摘要
当前,正在蓬勃发展的移动通信、多媒体通信业务和IP网络是21通信领域最引人注目的突出成就,也是发展最快的领域之一,随着这些业务的比例迅速增加,第二代移动通信系统的缺点和局限性日益显现,因此市场驱动和技术驱动促使人们探索和研究新的通信系统,即第三代移动通信系统。所谓第三代移动通信,是由卫星移动通信网和地面移动通信网组成,形成一个对全球无缝覆盖的立体通信网络满足城市和边远地区各种用户密度和高速移动用户的需求。它能够提供高速分组数据传输的增值业务,可以提供除了语音外的其它应用如数据、视频等。现在的移动通信系统,增值标准已经发展到能够提供适应第三代移动通信中所需求的业务。
如今,第三代移动通信的各种技术标准已经得到全面的发展,世界各国都纷纷开始第三代移动通信网络的测试和试用,我国的第三代移动通信也正在测试之中,并有望在2008年之前实现商用。但是,第三代移动通信的发展并不是一帆风顺的,由于其技术的不成熟性,不少国家都在使用过程中出现各种问题。根据他们发展第三代移动通信的经验,如何由第二代移动通信平滑过渡到第三代移动通信是至关重要的。此次毕业设计主要就是分析第三代移动通信的相关技术及其发展情况,并对其平滑过渡进行探讨。
在这篇论文中主要介绍了移动通信原理,第二代移动通信、第三代移动通信的相关技术以及如何由第二代移动通信平滑过渡到第三代移动通信,从而真正实现“任何人,任何时间,任何地点”的便利通信。
关键词:第三代移动通信 , WCDMA , CDMA-2000 , TD-SCDMA ,
        平滑过渡
 

 3G Mobile Communication Technology
Development and Smooth Transition
 
Abstract
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
              Smooth Transition

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