Method and device for detecting cyclic prefix type during initial cell search in long-term evolution system

A technology of initial search and long-term evolution, applied in transmission system, multi-carrier system, multi-frequency code system, etc., can solve the problems of not being able to obtain reference signals, not being applicable to LTE protocol, and having no way to determine the cell ID group, etc. The method is simple , to judge the exact effect

Active Publication Date: 2010-02-24
ZTE CORP
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Problems solved by technology

[0006] However, in the updated LTE protocol, the positions of the PSS and the SSS are different under the two CP types, so that the SSS positions obtained by using the two CP types according to the PSS timing position are also

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  • Method and device for detecting cyclic prefix type during initial cell search in long-term evolution system
  • Method and device for detecting cyclic prefix type during initial cell search in long-term evolution system
  • Method and device for detecting cyclic prefix type during initial cell search in long-term evolution system

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[0042] The basic idea of ​​the present invention is: according to the updated LTE protocol, in the conventional CP type and the extended CP type, the PSS timing position and the SSS position have a large timing deviation. After obtaining the PSS timing position and sector ID, the present invention According to the two CP types, extract the sequence of the SSS location in the received sequence according to the PSS timing position, and perform blind detection on the local SSS to obtain two correlation sets. The CP type corresponding to the correlation set where the correlation peak is located is the CP actually used in the cell Types of.

[0043] The technical solutions of the present invention will be described in detail below in conjunction with specific embodiments, such as image 3 As shown, the method includes:

[0044] Step 301: Obtain the PSS timing position and sector ID of the received sequence.

[0045] In the LTE protocol, each cell defines three PSSs, which correspond to t...

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Abstract

The invention discloses a method for detecting a CP type during initial cell search in an LTE system. The method comprises the following steps: acquiring a PSS timing position and a sector ID of a receiving sequence; extracting sequences of positions of SSS in the receiving sequence according to the conventional CP and the expanded CP based on the PSS timing position respectively, and carrying out correlated detection for the local SSS corresponding to the sector ID to acquire two correlation sets; and determining the CP type corresponding to the correlation sets where correlation peak valuesare positioned as the practical CP type used by the cell. The invention also discloses a corresponding device. The device comprises a timing position module and a correlation comparing module. The method and the device have the advantages of accurate judgment, simple method, and capability of being used for FDD-LTE and TDD-LTE frame structures.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to a method and device for detecting a cyclic prefix (CP, Cyclic Prefix) type during an initial search of a cell in a Long Term Evolution (LTE, Long Term Evolution) system. Background technique [0002] The LTE system has two types of CPs, called normal (Normal) CP and extended (Extend) CP, respectively. The regular CP is used in ordinary cells, and the extended CP is used in large cell radius or multicast service scenarios to overcome the problem of large multipath delay. After the user terminal (UE, User Equipment) is turned on, except for some local information, the LTE system information is unknown. Therefore, when the UE accesses the cell, it needs to first obtain the time-frequency synchronization and sector ID of the cell through the initial search of the cell. At the same time, because the UE does not know the CP type information adopted by the current cell, it n...

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Application Information

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IPC IPC(8): H04L27/26H04L27/38H04B1/707
Inventor 盛渊
Owner ZTE CORP
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