Cell searching method in LTE (long term evolution) system

A technology of cell search and cell group, which is applied in the field of cell search to achieve the effect of reduced computational complexity and high probability of correct detection

Inactive Publication Date: 2011-10-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0017] The purpose of the present invention is to solve the problems existing in the cell search method in the existing LTE system, and propose a cell search method in the LTE system

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  • Cell searching method in LTE (long term evolution) system
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  • Cell searching method in LTE (long term evolution) system

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Embodiment Construction

[0033] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0034] figure 2 Show the flowchart of the cell search method of the present invention in the LTE system, specifically as follows:

[0035] S1. The user terminal obtains the received signal r(k) within the PSS signal frequency band through a low-pass filter, and the cut-off frequency of the low-pass filter is 0.465 MHz, that is, half of the product of the number of sub-carriers occupied by the PSS and the sub-carrier spacing.

[0036] Those skilled in the art should understand that the cut-off frequency of the above-mentioned low-pass filter 0.465 MHz is only listed, and not used to limit the present invention. In fact, the cut-off frequency of the low-pass filter occupies sub-carriers according to the actual sub-carrier spacing and PSS Select other different values ​​for the number.

[0037] S2. Utilize the received signal obtained in step ...

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Abstract

The invention discloses a cell searching method in an LTE (long term evolution) system. The method comprises the following steps specifically; a user terminal obtains a receiving signal in a PSS (primary synchronization signal) signal frequency band through a low-pass filter; the PSS is detected according to the receiving signal to obtain 5ms time synchronization and identification (ID) in a physical layer cell group; the circular prefix (CP) length is detected by utilizing the receiving signal, so as to obtain the frequency synchronization and compensate the receiving signal; an SSS (secondary synchronization signal) is detected by utilizing the compensated signal, so as to obtain 10ms time synchronization and identification (ID) in the physical layer cell group. In the method of the invention, while the user terminal and the cell obtain time and frequency synchronization, a main synchronizing signal, an auxiliary synchronizing signal, the CP and the ID of the physical layer cell aredetected. By adopting the method, high correct detection probability to the PSS, the SSS and the CP is realized, and the operation complexity is low.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, in particular to a cell search method. Background technique [0002] Long Term Evolution (LTE, Long Term Evolution) is a mobile communication system standard developed by the 3rd Generation Partnership Project (3GPP, The 3rdGeneration Partnership Project). Technology, as well as the diversity antenna technology of MIMO (Multiple-Input Multiple-Output), simultaneously supports Frequency Division Duplexing (FDD, Frequency Division Duplexing) and Time Division Duplexing (TDD, Time Division Duplexing). [0003] In the LTE system, cell search is a very critical link. Because it is a prerequisite for establishing a communication link between a user terminal (UE, User Equipment) and a base station. Regardless of whether the user terminal accesses the cell after powering on, or performs cell handover during communication, it needs to rely on the cell search process to establish a connectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W48/16H04W56/00
Inventor 傅晓宇叶燕龙邹锴胡剑浩
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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