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

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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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 different. In this way, there is no way to determine the cell ID group using the existing technology , and the local reference signal cannot be obtained, so the existing algorithm is not suitable for the updated LTE protocol

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