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Cell searching device and method used for LTE (Long Term Evolution) system

A technology of cell search and cell group, which is applied to the communication between multiple stations, access restrictions, electrical components, etc., and can solve the problems that the cell search method cannot be used

Active Publication Date: 2011-05-04
北京中科晶上科技股份有限公司
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Problems solved by technology

[0003] In the existing 2G (GSM) protocol and 3G (CDMA2000 / WCDMA / TD-SCDMA) protocol, there are related methods for realizing cell search, but since the LTE (Long Term Evolution) Physical layer transmission technologies with completely different protocols, such as Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) and multi-antenna (MIMO, Multiple Input Multiple Output) technologies, make the cell search method in 2G or 3G not available in the LTE standard used in

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  • Cell searching device and method used for LTE (Long Term Evolution) system

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Embodiment Construction

[0075] The present invention will be described below in conjunction with the accompanying drawings and specific embodiments.

[0076] The cell search device and search method of the present invention are used to realize cell search. In the LTE standard, the work to be completed in the cell search mainly includes: realizing frequency synchronization; retrieving the primary synchronization signal and secondary synchronization signal to obtain the cell identification number; detecting the number of antennas and demodulating the broadcast channel (PBCH) Information in; realize wireless frame synchronization. In addition, the cell search may also include operations of removing the cyclic prefix and sequentially extracting OFDM time domain symbols.

[0077] The cell search needs to complete the above work, which is inseparable from the content of the LTE standard. Therefore, for the convenience of understanding, before the structure of the cell search device and the implementation ...

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Abstract

The invention provides a cell searching device, comprising an AFC (Automatic Frequency Control) and CP (Content Provider) judging device, a first FIFO (First In First Out) memory, a main synchronizing signal cross-correlator, a main synchronizing signal capturing state machine, an auxiliary synchronizing signal decoder, a Cell ID decoder and a PBCH (Physical Broadcasting Channel) decoder, whereinthe AFC and CP judging device is used for carrying out automatic frequency adjustment and CP length judgment on a received baseband digital signal, and the processed baseband digital signal is transmitted to the main synchronizing signal cross-correlator and simultaneously stored to the first FIFO memory; the main synchronizing signal cross-correlator is used for carrying out cross-correlation operation on the received baseband digital signal and a main synchronizing signal generated locally; the main synchronizing signal capturing state machine is used for capturing the main synchronizing signal and obtaining a Cell ID2 from the main synchronizing signal when the capturing is successful; the auxiliary synchronizing signal decoder decodes an auxiliary synchronizing signal to obtain a CellID1; the Cell ID decoder is used for figuring out a Cell ID according to the Cell ID2 and the Cell ID1; and the PBCH decoder is used for demodulating a PBCH by utilizing the Cell ID and analyzing system information containing a bandwidth and a system frame number.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a cell search device and method for an LTE system. Background technique [0002] In a mobile communication system based on a cellular network, the user terminal does not have any information about the cell it is in after it is turned on, so the user terminal first needs to perform a cell search to obtain necessary information before normal communication, and then select a suitable cell and camp on it. Stay in the cell, and then communicate with other user terminals. [0003] In the existing 2G (GSM) protocol and 3G (CDMA2000 / WCDMA / TD-SCDMA) protocol, there are related methods for realizing cell search, but since the LTE (Long Term Evolution) Physical layer transmission technologies with completely different protocols, such as Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) and multi-antenna (MIMO, Multiple Input Multiple Output)...

Claims

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Application Information

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IPC IPC(8): H04W48/18H04B7/26
Inventor 王剑黄守俊苏泳涛郑娟何莹彭吉生石晶林
Owner 北京中科晶上科技股份有限公司
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