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Method and device for searching neighbor-cell of LTE (long term evolution) system

A search method and neighboring cell technology, applied in the field of communication, can solve the problem of not being able to search all neighboring cells, and achieve the effect of increasing the probability of accurately searching neighboring cells and reducing the probability of false cells

Active Publication Date: 2012-06-20
合肥东芯通信股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] In view of this, the present invention provides a neighbor cell search method and device for an LTE system to overcome the problem in the prior art that it is easy to detect false cells when performing SSS detection, resulting in the inability to quickly and accurately search all neighbor cells

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Embodiment 1

[0083] Please see attached Figure 5 , the present invention discloses a method flowchart of a neighbor cell search in an LTE system, which mainly includes the following steps:

[0084] Step S101, receiving and processing the signal to obtain a corresponding digital signal.

[0085] In the process of performing step S101, firstly, the received signal is processed to obtain the required baseband signal, and then the obtained baseband signal is sampled and quantized, and processed by analog-to-digital conversion, and finally the output is obtained, corresponding to the received baseband signal. signal, and perform PSS detection and SSS detection described below using the digital signal.

[0086] Step S102: Perform PSS detection on the digital signal, and determine the Nid2 and 5ms timing of the neighboring cell according to the acquired correlation power of the digital signal in the time domain.

[0087] In the process of executing step S102, in the time domain, the three loca...

Embodiment 2

[0099] On the basis of the embodiment disclosed in the present invention, the embodiment disclosed in the present invention describes in detail the process of performing SSS detection, calculating and acquiring the adjacent area Nid1 corresponding to the determined true peak value and the 5ms identifier before and after.

[0100] like Image 6 It mainly includes the following steps:

[0101] Step S201, performing FFT on the acquired SSS symbols in the digital signal to obtain a frequency domain signal of the SSS symbols.

[0102] Step S202, extract the subcarriers corresponding to the SSS symbols in the frequency domain signal.

[0103] In the process of performing steps S201 and S202, FFT transform is performed on the SSS symbol in the received digital signal in the frequency domain to obtain the frequency domain signal corresponding to the SSS symbol, and then from the obtained frequency domain signal The subcarriers SSS_Sc(i) (i=0, . . . , 61) corresponding to the SSS sym...

Embodiment 3

[0139] On the basis of the methods disclosed in the first and second embodiments of the present invention, after acquiring the cell ID and frame timing of the neighboring cell, the method further includes:

[0140] Query whether the acquired neighbor cell ID exists in the neighbor cell list, if not, update the neighbor cell list; if it exists, do not update.

[0141] During the execution of the above process, the process of performing the PSS detection and the SSS detection is the same as the process in the above-mentioned Embodiment 1 and Embodiment 2, and thus will not be repeated here, and can be referred to each other.

[0142] The above-mentioned embodiments disclosed in the present invention describe in detail a method for detecting a neighboring cell of an LTE system. The method of the present invention can be implemented by various forms of devices. Therefore, the present invention also discloses a neighboring cell detection method for an LTE system. device, and specif...

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Abstract

The invention discloses a method and a device for searching a neighbor-cell of an LTE (long term evolution) system. The method comprises the following steps of: when SSS (Secondary Synchronization Signal) detection is carried out on a digital signal, comparing the peak value corresponding to the relative power of the digital signal on the frequency domain with the preset threshold, confirming the real peak value corresponding to the relative power according to the compared result; calculating the Nid1 corresponding to the real peak value and the Nid1 corresponding to a fake peak value and carrying out the dropping treatment until the comparison is finished; calculating and obtaining the Nid1 corresponding to the real peak value and marks before and after 5 ms; finally, calculating the ID (identification) Nid2 and 5 ms timing determined through preset PSS(Primary Synchronization Signal) detection, the Nid1, the marks before and after 5ms to obtain the Cell ID of the neighbor cell and the frame timing. According to the invention, by means of carrying out the threshold judgment on the SSS relative power and carrying out the dropping treatment on the determined fake peak value, the probability of generating a fake cell in the process of searching the neighbor cell is reduced and the probability of exactly searching the neighbor cell is improved.

Description

technical field [0001] The present invention relates to the field of communication technologies, and more particularly, to a method and an apparatus for searching neighbor cells of an LTE (Long Term Evolution system, long term evolution) system. Background technique [0002] Currently, in the transition process from the 3G era to the 4G era in the field of communication technologies, the LTE (Long Term Evolution system, Long Term Evolution) system is widely regarded as a quasi-4G wireless communication system. TD-LTE is an LTE system of TDD (Time Division Duplexing, time division duplexing) version. [0003] In the prior art, UE (User Equipment, user equipment) uses PSS (Primary Synchronization Signal, primary synchronization signal, SSS (Secondary Synchronization Signal, secondary synchronization symbol) to perform neighbor search. That is, the PSS and SSS are used to determine the cell used. Nid1, Nid2 and the frame timing of the cell, and the unique ID (IDentity, cell nu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/00H04W48/16
Inventor 李亚辉张国松胡剑锋莫勇任江涛吴齐发唐相国
Owner 合肥东芯通信股份有限公司
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