摘要
一、我国应积极参与第三代移动通信系统IMT-2000的研究和开发 1.第三代移动系统的出现是不以人的意志为转移的 自蜂窝移动系统问世以来。就以不可阻挡之势迅猛发展,人们越来越渴望在任何时间、任何地点与任何人进行通信。但是第一代、第二代移动系统都是以国家、地区漫游的形式建立的,全球漫游还只是一个梦想,因而在80年代中期国际电联的CCIR就开始着手研究能在全球使用的第三代移动通信系统。
The author positively believes that the third generation mobile communications systems will eventually emerge, independent of the human's will. The new versions of FPLMTS jointly defined by ITU-T and ITU-R and renamed as IML 2000 is a brand new solution for the future global seamless coverage and global roaming mobile services, integrating satellite, cel lular and cordless technologies.China's mobile communications markets theretofore,are still at the grasp of foreign vendors, Li pointed out. We left ablank in the history of the first generation system, attempting to catch up in the second generation development stagi , as canbe seen in the inclusion of the GSM in the State 8th FYP's key hitech R&.D projects. However, the paper noted , the technol-ogy solely belongs to the foreign developers. Due to various reasons, domestic development still lags behind the market , fails to seize the domestic cellular markets. The same is true with the development of the 2. 5 generation CDMA. We are also a late comer in the case of the third generation mobile systems, however, there is still the last tram to catch, and we beheve we can do something meaningful for ourselevs. 'This is a rare opportunity' , Li remarked.Our attitude towards the third generation is driven by the problem of shortage of frequency resources, especially in the next century. The paper suggests the following topics to be studied: part of the network signalling procedures: part of the wireless transmission technologies, and the transitional technologies. (P9)
