TD-SCDMA的长期演进与HSPA+增强技术

为了提高TD-SCDMA系统的传输速率，向国际电联IMT-Advanced所提技术指标迈进，TD-SCDMA的演进策略提上了研究议程。鉴于TD—SCDMA的短期演进HSPA（包括HSDPA和HSUPA）无法满足IMT-Advanced的要求，提出了HSPA＋和LTE的概念。本文首先介绍了TD-SCDMA未来演进和发展的趋势，包括TD-SCDMA的增强、短期演进、中长期演进以及基于IMT-Advanced的4G等。然后重点分析了HSPA＋的关键技术和协议架构等，最后对LTE的帧结构和多址方式进行了分析，提出了演进时的关键点和对策。

TD-SCDMA Long Term Evolution and HSPA+ Evolution Technology

In order to improve the transmission rate of TD-SCDMA and approach the technology performance requirements of IMT-Advanced proposed by ITU, the evolution strategies of TD-SCDMA are urgent. Considering the short term evolution technologies (named as HSPA, including HSDPA and HSUPA) not satisfying with requirements of IMT-Advanced, the HSPA+ and LTE technologies are proposed. This paper introduced the general evolution strategies of TD-SCDMA, and discussed the enhancement, short term evolution, medium and long term evolution, IMT-advanced based 4G technologies firstly. Then the key techniques and protocol structure of HSPA+ are focused, following by the frame structure and multiple access techniques of LTE. The key points and solutions for TD-SCDMA evolution are presented finally.