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1999年11月召开的国际电联芬兰会议确定的第三代移动通信无线接口标准,是移动通信领域的一个重要里程碑。会议确定了5个IMT-2000技术提案的规范,其中包括中国提交的TD-SCDMA标准,这是中国在百年的通信史上第一次制定了国际标准;对中国通信业来说,是一个重大的突破。 TD-SCDMA作为TDD模式,其上行和下行链路在同一频点、不同的时隙(Time slot)进行双工通信,可以按上、下行链路所需的数据量动态分配,这不仅仅适应于对称的如传统的语音业务,尤其适合于日益增长的非对称的实时、非实时数据业务,如多媒体、互联网等业务。动态地按需分配时
The third generation mobile wireless interface standard, as determined by the ITU Finland conference in November 1999, is an important milestone in the area of mobile communications. The conference finalized the specifications of five IMT-2000 technical proposals, including the TD-SCDMA standard submitted by China. This is the first time that China has formulated international standards in the history of communications in the past century. For the Chinese telecommunications industry, it is a major breakthrough. TD-SCDMA as TDD mode, the uplink and downlink in the same frequency, different time slots (Time slot) for duplex communication, according to the uplink and downlink data volume required for dynamic allocation, which not only adapt In the symmetrical traditional voice service, it is especially suitable for the growing asymmetric real-time, non-real-time data services such as multimedia and Internet. When dynamically assigned on demand