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时分同步码分多址系统(TD-SCDMA,Time Division-Synchronous Code Division Multiple Access)作为我国第一个拥有自主知识产权的国际通信标准,集CDMA、TDMA、SDMA等技术优势于一体,同时采用了智能天线、联合检测、同步CDMA、自适应功率控制等技术,具有系统容量大、频谱利用率高、抗干扰能力强等特点。考虑到不断增长的无线数据业务对网络性能带来的新要求,尤其是下行业务的要求,3GPP Release 5引入了重要的增强技——HSDPA。它采用共享的下行信道进行数据传输,通过引入AMC、HARQ、快速调度、16QAM等技术,得到了较高的数据吞吐量,并有效降低了数据重传的程度和传输时延。目前TD-SCDMA系统的HSDPA技术和标准已趋于成熟,相应的外场测试和进网检验都在进行中,这些都为进一步商用打下了坚实的基础。
Time Division-Synchronous Code Division Multiple Access (TD-SCDMA), as the first international communication standard with independent intellectual property rights in China, integrates the technical advantages of CDMA, TDMA and SDMA, etc., Smart antenna, joint detection, synchronous CDMA, adaptive power control and other technologies, with the system capacity, high spectrum efficiency, anti-interference ability and so on. Taking into account the new requirements brought by the growing wireless data services on network performance, especially the requirements of downlink services, 3GPP Release 5 introduces an important enhancement technology - HSDPA. It uses a shared downlink channel for data transmission. By introducing technologies such as AMC, HARQ, fast scheduling and 16QAM, higher data throughput is achieved, and the degree of data retransmission and transmission delay are effectively reduced. At present, the HSDPA technologies and standards of the TD-SCDMA system have become mature. Corresponding field tests and network intrusion tests are in progress, which have laid a solid foundation for further commercial applications.