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Method and apparatus for searching downlink synchronous code

A synchronization code and line synchronization technology, which is applied in the field of searching downlink synchronization codes, can solve problems such as shortening UE service life and increasing UE manufacturing costs

Active Publication Date: 2009-06-10
DATANG MOBILE COMM EQUIP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using VCTCXO will greatly increase the manufacturing cost of UE
Moreover, due to the aging of the VCTCXO, the frequency offset of the VCO will still increase with the use time, which means that the service life of the UE will be limited by the aging time of the device, shortening the service life of the UE

Method used

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

Examples

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Embodiment Construction

[0072] The basic idea of ​​the present invention is: carry out frequency shift to the SYNC_DL code in the SYNC_DL code set in advance so as to expand the search range, no matter how big the frequency offset of the baseband signal is, the frequency offset value will always fall on a certain frequency point among the multiple frequency points near a frequency point, thus being searched.

[0073] In order to enable those skilled in the art to better understand the present invention, the method for searching the SYNC_DL code provided by the present invention will be specifically described below in conjunction with specific embodiments.

[0074] figure 2 A flow of searching for a SYNC_DL code is shown.

[0075] To simplify the description, the frequency-shifted SYNC_DL codes are collectively referred to as "second SYNC_DL codes", and the SYNC_DL codes in the SYNC_DL code set without frequency shifting are collectively referred to as "first SYNC_DL codes".

[0076] In step 201, e...

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Abstract

The invention discloses a method and a device for searching a downlink synchronous code. The method comprises: each first SYNC_DL code is subjected to frequency translation to correspondingly obtain each second SYNC_DL code; each second SYNC_DL code is adopted to search and calculate the SYNC_DL code in a baseband signal; and each relevant peak value obtained through calculation is compared so as to obtain the SYNC_DL code corresponding to the largest relevant peak value as a search result. With the method, as the SYNC_DL code is subjected to frequency translation, the SYNC_DL code can be searched near a plurality of frequency points. Even if the frequency deviation of the baseband signal is large, and the frequency deviation value always drops near a certain frequency point in the plurality of the frequency points, thereby the baseband signal is searched. The invention also discloses a device for searching the SYNC_DL code.

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 a downlink synchronization code (SYNC_DL). Background technique [0002] Cell search refers to a process in which a user equipment (UE) must search for a suitable cell as soon as possible when it is turned on or in a mobile state, and access (usually referred to as logging in) the cell in order to use services provided by the network. In a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system, a SYNC_DL code is set for the UE to initially search for a cell. Since the network side only sends the SYNC_DL code in the downlink pilot time slot (DwPTS), after the UE determines the SYNC_DL code in the subframe data through searching, it can determine the DwPTS and then log in. figure 1 The structure of the SYNC_DL code is shown. The length of the SYNC_DL code is 4 symbols and a total of 64 chips (chip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B7/26
Inventor 王乃博徐兵郭华永
Owner DATANG MOBILE COMM EQUIP CO LTD
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