中文摘要：

针对TD—SCDMA下行小区搜索中下行导频时隙（DwPTS）位置搜索、下行同步码（SYNCDL）位置的确定以及控制复帧同步三个步骤中的关键问题提出了解决方法。第一个步骤中根据TD-SCDMA子帧结构特点采用功率模板法确定下行导频时隙的位置：第二个步骤中采用定义模板法确定下行同步码的位置；第三个步骤中通过快速的TD-SCDMA信道估计方法检测下行导频信道来控制复帧同步。以上方法简化了计算的复杂性．可实现快速高效的网络测量，满足TD—SCDMA网络规划及优化的需求，这些在仿真结果和现场测试中都得到了验证。

英文摘要：

Solutions of each step in TD-SCDMA downlink cell search are provided. Search steps are downlink guide slot （DwPTS） position search, downlink synchronization code （SYNC_DL） position search and frame synchronization control. Based on characteristics of frame and slot structure in TD-SCDMA, power-matching pattern method is used to find the position of downlink guide slot （DwPTS） and definition pattern method is proposed to decide the position of downlink synchronization code （SYNC_DL）. To control frame synchronization, channel estimation for TD-SCDMA mobile communication system can be achieved through a new fast method of detecting downlink guide channel. These new methods simplify calculation complexity, realize fast and high efficiency network test system and can be applied to TD-SCDMA network planning and optimization, which are proved by simulation and field testing.