Time synchronization method and device in cell search process
A technology of time synchronization and cell search, which is applied in the field of communication, can solve problems such as timing errors, increased processing delay and calculation amount, and the peak value of correlation functions is not obvious, so as to achieve the effect of improving accuracy and success rate
Active Publication Date: 2013-06-26
DATANG MOBILE COMM EQUIP CO LTD
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[0024] However, when the signal-to-noise ratio is low, if the UE is in a deep fading channel or at the edge of a cell, the synchronization signal is completely submerged in the noise, and no matter whether the algorithm based on autocorrelation or cross-correlation is used, the peak value of the correlation function is not obvious, so the There will be a timing error
If the subsequent operations are performed at the wrong timing, such as frequency offset estimation and cell ID detection, it is meaningless and will only increase a large amount of processing delay and calculation
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[0038] The embodiment of the present invention provides a method and device for time synchronization in the process of cell search, which are used to improve the accuracy of time synchronization in the process of cell search.
[0039] The technical solutions provided by the embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0040] see image 3 , a time synchronization method in a cell search process provided by an embodiment of the present invention generally includes steps:
[0041] S101. The terminal performs multiple time synchronization detections on signals received from the base station, and obtains multiple sets of detection results, wherein each set of detection results includes a primary synchronization signal PSC sequence and a synchronization time corresponding to the PSC sequence.
[0042] S102. The terminal determines a final PSC sequence and a synchronization time by using multiple sets of detection resu...
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The invention discloses a time synchronization method and device in the cell search process for improving the time synchronization accuracy in the cell search process. The time synchronization method in the cell search process comprises: a terminal carries out multiple-time time synchronization detection on a signal received from a base station to obtain multiple groups of detection results, wherein each group of detection results comprises a primary synchronizing signal channel (PSC) sequence and synchronizing time corresponding to the PSC sequence; and the terminal determines the final PSC sequence and the synchronizing time according to multiple groups of detection results.
Description
technical field [0001] The present invention relates to the field of communication technologies, in particular to a time synchronization method and device in a cell search process. Background technique [0002] The cell search process is a very critical process in wireless cellular communication, because it is a prerequisite for establishing a communication link between a user terminal (UE) and a base station. The main functions of the cell search include: after the UE is turned on, it can quickly capture and identify the cell; complete the downlink time synchronization and downlink frequency synchronization of the system; read the broadcast information of the system, so as to perform normal camping. [0003] In the process of cell search, it is first necessary to complete the downlink time synchronization with the base station, and on this basis, some subsequent operations, such as cell identification (ID) detection and downlink frequency synchronization, will be performed....
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IPC IPC(8): H04W48/16H04W56/00
Inventor 张凌雁石蕊
Owner DATANG MOBILE COMM EQUIP CO LTD