TD-SCDMA移动通信系统的增强和演进

Enhancement and Evolution of TD-SCDMA Systems

时分-同步码分多址(TD-SCDMA)作为具有中国自主知识产权的第三代移动通信标准之一,即将全面商用化。TD-SCDMA未来的增强和演进是目前热点问题之一,各种方案不断提出,但还没有一个结合短期发展和长期发展的可持续发展计划。根据采用的关键核心技术不同,文章提出了TD-SCDMA增强和演进的4阶段论:第一阶段为当前的TD-SCDMA阶段;第二阶段是TD-SCDMA短期演进,即HSxPA阶段(包括HSDPA、HSUPA和HSPA演进);第三阶段是长期演进阶段;最后一阶段是基于TD-SCDMA的时分双工(TDD)超3G(B3G)或者第4代移动通信系统阶段。详细描述了演进过程中每个阶段的主要特点,以及多输入多输出(MIMO)、正交频分复用(OFDM)等新技术在演进过程的使用。

Time Division - Synchronous Code Division Multiple Access （TD-SCDMA）, a home-grown standard for the third generation mobile communications, is already mature and ready for commercial deployment. The enhancement and evolution of TD-SCDMA systems is a hot topic these days. Many strategies have been proposed, but there are no integrated solutions that can jointly consider the development both in the short term and in the long term. This paper discusses four evolution phases for TD-SCDMA enhancement and evolution, which are proposed according to the key technologies. Phase 1 is about the existing TD-SCDMA system. Phase 2 is the short term evolution of the system, i.e. the period of HSxPA, including evolution of High Speed Downlink Packet Access （HSDPA）, High Speed Uplink Packet Access （HSUPA） and High Speed Packet Access （HSPA）. Phase 3 is the Long Term Evolution （LTE）. Phase 4 is the Beyond 3G （B3G）/Fourth Generation （4G） mobile communication Time Division Duplex （TDD） system, based on TD-SCDMA. Key characters for every evolution phase are discussed, as well as the new technologies adopted in the evolution process, such as Multiple Input Multiple Output （MIMO） and Orthogonal Frequency Division Multiplexing （OFDM）.