Method and apparatus for searching position of downlink synchronous code

A technology of synchronization code and code number, which is applied in the field of signal search and can solve problems such as failure to search for SYNC_DL

Active Publication Date: 2009-02-11
LEADCORE TECH
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Problems solved by technology

[0007] Although the correlation detection method can simplify the ICS process, since there is a certain correlation between the midamble code and the SYNC_DL code, and when SYNC_DL is slidingly correlated with the signal of the entire subframe, the correlation peak is not only related to the correlation between the signal and SYND_DL , is also related to the strength of the received signal, so when there is another UE near the UE, there is likely to be a strong uplink interference slot at this time, which will cause the correlation peak to appear in the midamble code part of the uplink interference slot, resulting in Search for SYNC_DL failed

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  • Method and apparatus for searching position of downlink synchronous code
  • Method and apparatus for searching position of downlink synchronous code
  • Method and apparatus for searching position of downlink synchronous code

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Embodiment Construction

[0047] In order to enable those skilled in the art to better understand the present invention, the methods provided by the present invention will be specifically described below in conjunction with specific examples. figure 2The flow of the method is shown.

[0048] In step 21, each candidate SYNC_DL is slidingly correlated with the signal received in the characteristic window, and the correlation peak value of each candidate SYNC_DL in each time slice is obtained;

[0049] And in step 22, for each candidate SYNC_DL, calculate the correlation peak ratio of each time slice to the adjacent time slice, and obtain the correlation peak ratio of each candidate SYNC_DL in each time slice.

[0050] Then, in step 23, the maximum correlation peak ratio of each candidate SYNC_DL in each subframe and the time slice where the maximum correlation peak ratio is located are recorded.

[0051] At the end of the search period, in step 24, for each candidate SYNC_DL, its maximum correlation pe...

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Abstract

The invention discloses a method for searching the position of SYNC-DL. The method comprises the following steps: correlating each candidate SYNC_DL with signals in a characteristic window in a sliding manner, and acquiring the correlative peak of each candidate SYNC_DL in each time slice; calculating the ratio of the correlative peaks of each candidate SYNC_DL in each time slice and the neighboring time slice to obtain the correlative peak ratio of each candidate SYNC_DL in each time slice; recording the maximal correlative peak ratio of each candidate SYNC_DL in each sub-frame, and the time slice to which the maximal correlative peak ratio belongs; and summing the maximal correlative peak ratio of each candidate SYNC_DL in the same time slice in each sub-frame when the searching period is ended to obtain the maximal correlative peak ratio of each candidate SYNC_DL in the searching period, wherein the candidate SYNC_DL corresponding to the maximal value and the corresponding time slice are respectively the SYNC_DL used at the network side and the position of the SYNC_DL. The invention also discloses a device for searching the position of SYNC-DL.

Description

technical field [0001] The invention relates to a signal search technology in a mobile communication system, in particular to a method and a device for searching downlink synchronization code positions in a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system. Background technique [0002] Initial cell search (ICS, Initial Cell Search) means that the user equipment (UE, User Equipment) must search for a suitable cell as soon as possible when it is turned on or in a mobile state, and quickly access it (usually called login) in order to use the network The process of providing the service. The purpose of ICS is to allow the UE to synchronize with the base station (NB, Node B) on the same frequency, determine the starting position of the wireless frame, determine the code number of the downlink synchronization code (SYNC_DL) and the basic training sequence (midamble), and then pass the detection and The demodulation process decodes broadcast channel (BCH, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/216H04B1/707
Inventor 徐兵
Owner LEADCORE TECH
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