Development and progress of TD_SCDMA mobile communication system Telecommunication Science 2002 Issue 8 Special Topic: Mobile Communication Technology Development and Progress of TD-SCDMA Mobile Communication System Li Jun3 (Kaiming Technology Co., Ltd. Shanghai 201108) Abstract This paper first describes the background of the project \"Research and Development of Practical Application of TD-SCDMA Mobile Communication System\", a major project of the \"863\" plan of the National Science and Technology Commission. Based on the application of the second generation mobile communication system in my country and the characteristics of TD-SCDMA wireless transmission technology, the project goals are determined as follows: the first stage is to develop the TSM (TD-SCDMA for GSM System) mobile communication system; the second stage is to develop the 3GPP TD-SCDMA mobile communication system. Then a relatively comprehensive introduction is given to the development of the project, the achievements and the current status of terminal productization. Keywords IMT-2000 TSM TD-SCDMA mobile communication system 1 Introduction Facing the huge market potential of the third generation mobile communication, with the joint efforts of my country\'s communication standardization organizations, operators and manufacturing enterprises, the low chip rate (Low Chip rate) time division duplex wireless transmission technology (RTT) - TD-SCDMA, which is proposed by my country and mainly based on my country\'s technology and intellectual property rights (IPR) and has significant advantages in performance and networking, has been identified by the International Telecommunication Union as the third generation of land mobile communication time division duplex 2 Characteristics of TDD and TD-SCDMA The third generation mobile communication has two working modes: FDD (frequency division duplex) and TDD (time division duplex). The two modes have different technical characteristics. FDD is suitable for large-area national systems and symmetrical services, such as voice and interactive real-time data services; TDD is suitable for high-density user areas, local coverage in cities and suburbs, and is suitable for symmetrical and asymmetrical data services, such as voice, real-time data services, especially Internet services. The characteristics of TD-SCDMA are as follows: (1) Adopting TDD duplex mode TDD wireless transmission technology does not require paired frequencies...
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