LTE小区搜索过程是UE和小区取得时间和频率同步，并检测小区ID的过程。E-UTRA系统的小区搜索过程与UTRA系统的主要区别是它能够支持不同的系统带宽（1.4~20MHZ）。小区搜索通过若干下行信道实现，包括同步信道（SCH）、广播信道（BCH）和下行参考信号（RS）。SCH又分成主同步信道（PSCH）和辅同步信道（SSCH），BCH又分成主广播信道（PBCH）和动态广播信道（DBCH）。-LTE cell search procedure the UE and the cell made time and frequency synchronization, and detects a cell ID of the process. The main difference between the E-UTRA system, a cell search procedure and UTRA system is its ability to support different system bandwidths (1.4 ~ 20MHZ). The cell search by a number of downstream channels to achieve, including the synchronization channel (SCH), a broadcast channel (BCH) and the downlink reference signal (RS). SCH is divided into a primary synchronization channel (PSCH) and secondary synchronization channel (SSCH), BCH is divided into a primary broadcast channel (PBCH) and dynamic broadcast channel (DBCH).