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
CN101453237AActive Publication Date: 2009-06-10DATANG MOBILE COMM EQUIP CO LTD +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
DATANG MOBILE COMM EQUIP CO LTD
Publication Date
2009-06-10

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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.
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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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