CN111294826B - Cell detection method and device, storage medium and terminal - Google Patents

Abstract

A cell detection method and device, a storage medium, and a terminal, the cell detection method includes: detecting a received primary synchronization signal and a secondary synchronization signal to obtain a candidate cell associated with the successfully detected primary synchronization signal and the secondary synchronization signal ; Group each candidate cell to obtain at least one candidate cell group; For each candidate cell in each candidate cell group, determine whether the candidate cell is a false cell, if so, delete the candidate cell, if not, then The candidate cell is taken as the detected cell. Through the technical solutions provided by the embodiments of the present invention, the cell detection performance can be improved.

Description

Cell detection method and device, storage medium and terminal

technical field

The present invention relates to the field of communication technologies, and in particular, to a cell detection method and device, a storage medium and a terminal.

Background technique

In a mobile communication system, if a Long Term Evolution (LTE) user equipment (UserEquipment, UE) is located in a same-frequency multi-cell or similar environment (for example, some instrument use cases and the overlapping area of outfield cells, etc.), And the same-frequency cells are basically synchronized, so the detection performance of the same-frequency cells with weak signals will be degraded, and false alarms are prone to occur.

In general, the conventional solution is to first use Interference Cancellation (IC) technology to eliminate strong co-frequency cell signals, and then perform cell detection to reduce adverse effects caused by other cells at the same frequency through repeated iterations.

However, due to errors in channel estimation, the influence of the co-frequency cell cannot be completely eliminated after IC processing. Therefore, the cell detection of the co-frequency cell needs to be optimized.

SUMMARY OF THE INVENTION

The technical problem solved by the present invention is how to optimize cell detection to improve cell detection performance.

In order to solve the above technical problem, an embodiment of the present invention provides a cell detection method, including: detecting the received primary synchronization signal and the secondary synchronization signal, so as to obtain a candidate cell associated with the successfully detected primary synchronization signal and the secondary synchronization signal; Group each candidate cell to obtain at least one candidate cell group; for each candidate cell in each candidate cell group, determine whether the candidate cell is a false cell, if so, delete the candidate cell, if not, remove the candidate cell The candidate cell is used as the detected cell.

相同，且基本同步的候选小区划分为同一组，其中，

表示物理小区组的组内标识，所述基本同步指的是对于基于所述主同步信号估计得到的各个候选小区各自的定时时间，任意两个小区之间的定时偏差不超出预设时长。Optionally, each candidate cell is grouped in the following manner:

The candidate cells that are the same and basically synchronized are divided into the same group, wherein,

Indicates the intra-group identifier of the physical cell group, and the basic synchronization means that the timing deviation between any two cells does not exceed a preset duration for the respective timing times of each candidate cell estimated based on the primary synchronization signal.

Optionally, the secondary synchronization signal includes an odd sequence, and the detection of the received primary synchronization signal and the secondary synchronization signal to obtain a candidate cell associated with the successfully detected primary synchronization signal and the secondary synchronization signal includes: The primary synchronization signal is detected; when the detection result of the primary synchronization signal is greater than the preset primary synchronization signal detection threshold, the received secondary synchronization signal is detected; if the secondary synchronization signal meets the preset detection success condition, then The cell associated with the primary synchronization signal and the secondary synchronization signal is used as a candidate cell; wherein, the preset detection success condition is: the detection result of the secondary synchronization signal is greater than a preset first detection threshold, or the secondary synchronization The detection result of the odd sequence in the signal is greater than the preset second detection threshold.

Optionally, before judging whether the candidate cell is a fake cell, the cell detection method further includes: determining a priori cell, where the priori cell refers to a plurality of candidate cells at the same frequency point that are detected in advance. The real cell or the candidate cell with the best signal quality among the multiple candidate cells.

Optionally, the secondary synchronization signal of the candidate cell includes an odd sequence and an even sequence, and the judging whether the candidate cell is a false cell includes: determining the m ₀ sequence and the m ₁ sequence of the prior cell; When all the following conditions are met, the candidate cell is judged to be a false cell: when it is in time slot 0, the m ₀ sequence of the candidate cell is the same sequence as the m ₀ sequence of the prior cell, and when it is in time slot 5 , the m ₁ sequence of the candidate cell and the m ₁ sequence of the prior cell are the same sequence, the detection result of the odd sequence does not exceed the preset second detection threshold, and the detection result of the even sequence does not exceed the preset second detection threshold. A third detection threshold is set, and the quotient of the detection result of the odd sequence and the detection result of the even sequence does not exceed a preset fourth detection threshold.

Optionally, the preset third detection threshold is determined based on the prior cell, and is proportional to the even sequence detection result of the prior cell.

Optionally, the preset fourth detection threshold is determined based on the prior cell, and increases as the timing offset of the prior cell increases.

In order to solve the above technical problem, an embodiment of the present invention also provides a cell detection device, including: a detection module, adapted to detect the received primary synchronization signal and secondary synchronization signal, so as to obtain the successfully detected primary synchronization signal and secondary synchronization signal The candidate cells associated with the signal; the grouping module is adapted to group each candidate cell to obtain at least one candidate cell group; the judging module is adapted to determine whether the candidate cell is a candidate cell for each candidate cell in each candidate cell group If it is a false cell, delete the candidate cell, if not, use the candidate cell as the detected cell.

In order to solve the above technical problem, an embodiment of the present invention further provides a storage medium on which computer instructions are stored, and when the computer instructions are executed, the steps of the above method are executed.

To solve the above technical problem, an embodiment of the present invention further provides a terminal, including a memory and a processor, where the memory stores computer instructions that can be run on the processor, and when the processor runs the computer instructions Perform the steps of the above method.

Compared with the prior art, the technical solutions of the embodiments of the present invention have the following beneficial effects:

An embodiment of the present invention provides a cell detection method, including: detecting a received primary synchronization signal and a secondary synchronization signal to obtain candidate cells associated with the successfully detected primary synchronization signal and the secondary synchronization signal; grouping each candidate cell , to obtain at least one candidate cell group; for each candidate cell in each candidate cell group, determine whether the candidate cell is a false cell, if so, delete the candidate cell, if not, then use the candidate cell as the detected cell. 's district. In the embodiment of the present invention, after the candidate cells are obtained, the candidate cells are grouped and it is determined one by one whether the candidate cells in each candidate cell group are false cells, which can improve the cell detection performance of the terminal.

Further, the secondary synchronization signal includes an odd sequence, and the detection of the received primary synchronization signal and the secondary synchronization signal to obtain a candidate cell associated with the successfully detected primary synchronization signal and the secondary synchronization signal includes: detecting the received primary synchronization signal and the secondary synchronization signal. The synchronization signal is detected; when the detection result of the primary synchronization signal is greater than the preset primary synchronization signal detection threshold, the received secondary synchronization signal is detected; if the secondary synchronization signal meets the preset detection success condition, the received secondary synchronization signal is detected. The cell associated with the primary synchronization signal and the secondary synchronization signal is used as a candidate cell; wherein, the preset detection success condition is: the detection result of the secondary synchronization signal is greater than the preset first detection threshold, or, in the secondary synchronization signal The detection result of the odd sequence is greater than the preset second detection threshold. Compared with the prior art solutions, in the embodiment of the present invention, the preset detection success condition when detecting the secondary synchronization signal is relatively loose, which increases the probability of successful detection of the secondary synchronization signal, makes it easier for the secondary synchronization signal sequence to be successfully detected, and greatly reduces the The probability of missed detection of cell detection.

Further, the secondary synchronization signal of the candidate cell includes an odd sequence and an even sequence, and the judging whether the candidate cell is a false cell includes: determining the m ₀ sequence and the m ₁ sequence of the prior cell; when the candidate cell satisfies the following When all conditions are met, the candidate cell is judged to be a false cell: when it is in time slot 0, the m 0 sequence of the candidate cell is the same sequence as the m ₀ sequence of the prior cell, and when it is in time slot 5, the m ₀ sequence of the candidate cell is the same sequence. The m ₁ sequence of the candidate cell and the m ₁ sequence of the prior cell are the same sequence, the detection result of the odd sequence does not exceed the preset second detection threshold, and the detection result of the even sequence does not exceed the preset second detection threshold. Three detection thresholds, the quotient of the detection result of the odd sequence and the detection result of the even sequence does not exceed a preset fourth detection threshold. The embodiments of the present invention can determine whether a candidate cell is a false cell according to multiple preset detection thresholds, thereby providing a feasible solution for further reducing the false detection probability of secondary synchronization signal detection and improving cell detection performance.

Description of drawings

1 is a schematic flowchart of a cell detection method according to an embodiment of the present invention;

2 is a schematic flowchart of another cell detection method according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a cell detection apparatus according to an embodiment of the present invention.

Detailed ways

Those skilled in the art understand that, as stated in the background art, it is difficult to completely eliminate the adverse effects brought by the cells at the same frequency point by using the IC technology in the prior art.

Generally, the cell detection of the LTE UE is directly based on the correlation calculation result between the received signal of the Primary Synchronization Signal (PSS) and the Secondary Synchronization Signal (SSS) and the local sequence. When there are multiple cells under the same frequency, the performance of cell detection will be degraded due to co-channel interference.

For this reason, in the cell detection in the multi-cell scenario of the same frequency point in the prior art, IC technology is usually used to reduce the interference of strong co-frequency cells. The main process is as follows: First, reconstruct the PSS and/or SSS received signals of the prior strong cell, secondly, subtract the reconstructed PSS and SSS received signals of the prior strong cell from the locally buffered air interface received signal, and then proceed to the cell. detection. Since this scheme relies on the channel estimation results of PSS and SSS, and the channel estimation of PSS and SSS has errors, it cannot completely eliminate the adverse effects caused by cells at the same frequency, and false cells may be detected by mistake.

其中，

表示物理小区组的组标识，

表示物理小区组的组内标识。In the LTE communication system, the 3rd Generation Partnership Project (3GPP) protocol 36.211 defines Physical Cell Identities (PCI for short, also known as Cell ID) as

in,

represents the group ID of the physical cell group,

Indicates the intra-group identifier of the physical cell group.

其取值范围是0至167，每个组包括3个不同的组内标识

其取值范围是0至2。In LTE, the physical layer distinguishes different cells by Cell ID. There are a total of 504 Cell IDs divided into 168 different groups

Its value range is 0 to 167, and each group includes 3 different intra-group identifiers

Its value range is 0 to 2.

和

的值，是通过对PSS与SSS的检测确定的。

是通过PSS检测获得的。

的值是通过SSS检测获得的。并且，每个

都有唯一的图样(pattern)，即序列m₀与序列m₁形成的m₀/m₁图样。The purpose of LTE cell detection is to determine

and

The value of is determined by the detection of PSS and SSS.

was obtained by PSS detection.

The value of is obtained by SSS detection. and, each

Each has a unique pattern, that is, the m ₀ /m ₁ pattern formed by the sequence m ₀ and the sequence m ₁ .

Because whether coherent detection or non-coherent detection, and whether IC is performed or not, the received signal must be transformed to the frequency domain by the Fast Fourier Transform (FFT) algorithm when the SSS is finally detected, and the SSS frequency domain is obtained. sequence. The SSS frequency domain sequence includes even sequence and odd sequence. Assuming that the even sequence is represented by d(2n) and the odd sequence is represented by d(2n+1), then:

相关，

与

则与m₀/m₁相关。Among them, c ₀ (n) and c ₁ (n) are only

related,

and

Then it is related to m ₀ /m ₁ .

和m₀相关，在子帧5上则仅与

和m₁相关；而奇序列d(2n+1)，则不论子帧0还是子帧5，均与

m₀和m₁都相关。It can be found that the even sequence d(2n) of the SSS frequency domain sequence is only the same as the subframe 0.

is related to m ₀ , and on subframe 5 it is only related to

is related to m ₁ ; and the odd sequence d(2n+1), regardless of subframe 0 or subframe 5, is related to

Both m ₀ and m ₁ are related.

与本地SSS频域序列d(n)进行相关运算。考虑到SSS频域接收序列的偶序列与奇序列不相同，可通过间隔抽取的方式，提取出SSS频域接收序列的偶序列

和奇序列

之后，可以分别与本地SSS频域序列的偶序列d(2n)和奇序列d(2n+1)进行相关，从而得到相关值。Assume that the SSS frequency domain receive sequence is

Correlation operation is performed with the local SSS frequency domain sequence d(n). Considering that the even sequence of the SSS frequency domain received sequence is different from the odd sequence, the even sequence of the SSS frequency domain received sequence can be extracted by interval extraction

and odd sequence

Afterwards, correlation can be performed with the even sequence d(2n) and the odd sequence d(2n+1) of the local SSS frequency domain sequence respectively to obtain the correlation value.

图样，所述奇序列的相关值为R_odd，所述偶序列的相关值为R_even：Below is a

pattern, the correlation value of the odd sequence is R _odd , and the correlation value of the even sequence is R _even :

表示所述SSS频域接收序列的偶序列，奇序列

表示所述SSS频域接收序列的奇序列；d(2k)表示所述本地SSS频域序列的偶序列，奇序列d(2k+1)表示所述本地SSS频域序列的奇序列。Among them, even sequence

Represents the even sequence, odd sequence of the SSS frequency domain received sequence

represents the odd sequence of the SSS frequency domain received sequence; d(2k) represents the even sequence of the local SSS frequency domain sequence, and the odd sequence d(2k+1) represents the odd sequence of the local SSS frequency domain sequence.

图样进行小区检测时，如果PSS检测成功，则会进入SSS检测阶段。检测所述SSS时，子帧0上的偶序列的相关值仍以R_even表示。当

与先验小区的

相同时，R_even就会偏高；相应地，在子帧5上，当

与先验小区的

相同时，R_even也会偏高。In the scenario where it is known that there is a priori cell, no matter whether there are other cells with the same frequency point, traverse the frequency point

When the pattern is used for cell detection, if the PSS detection is successful, it will enter the SSS detection phase. When detecting the SSS, the correlation value of the even sequence on subframe 0 is still represented by R _even . when

with a priori

At the same time, R _even will be high; correspondingly, on subframe 5, when

with a priori

At the same time, R _even will be high.

At this time, if a single SSS correlation value R _sss =R _even +R _odd is used as the SSS detection threshold, then once the SSS detection threshold is too low, even if there are no other co-frequency cells, false cells may be detected by mistake; if the SSS detection threshold is too low If the SSS detection threshold is too high, a real weak cell may be missed.

An embodiment of the present invention provides a cell detection method, including: detecting a received primary synchronization signal and a secondary synchronization signal to obtain candidate cells associated with the successfully detected primary synchronization signal and the secondary synchronization signal; grouping each candidate cell , to obtain at least one candidate cell group; for each candidate cell in each candidate cell group, determine whether the candidate cell is a false cell, if so, delete the candidate cell, if not, then use the candidate cell as the detected cell. 's district. In the embodiment of the present invention, after the candidate cells are obtained, the candidate cells are grouped and it is determined one by one whether the candidate cells in each candidate cell group are false cells, which can improve the cell detection performance of the UE.

In order to make the above objects, features and beneficial effects of the present invention more clearly understood, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic flowchart of a cell detection method according to an embodiment of the present invention. The cell detection method may be implemented by a terminal, and the terminal may be an LTE UE. The LTE UE may include but is not limited to devices such as mobile phones.

The cell detection refers to a single cell detection, which may include PSS and SSS detection. Cell detection algorithms may include, but are not limited to, coherent detection and incoherent detection. Cell detection scenarios may include, but are not limited to: initial network search, cell reselection, cell handover, cell measurement, and the like.

Specifically, the cell detection method may include the following steps:

Step S101, detecting the received primary synchronization signal and the secondary synchronization signal to obtain a candidate cell associated with the successfully detected primary synchronization signal and the secondary synchronization signal;

Step S102, grouping each candidate cell to obtain at least one candidate cell group;

Step S103, for each candidate cell in each candidate cell group, determine whether the candidate cell is a false cell, if so, delete the candidate cell, if not, take the candidate cell as a detected cell.

More specifically, in step S101, the UE may receive and perform PSS and SSS detection to complete cell detection.

When performing cell detection, the PSS is first received and detected. When the detection result of the PSS is greater than the preset primary synchronization signal detection threshold, it indicates that the PSS is successfully detected. Otherwise, when the detection result of the PSS is not greater than the preset primary synchronization signal detection threshold, it indicates that the current cell detection fails, and the secondary cell detection is directly ended.

In a specific implementation, the PSS detection may be implemented by using the existing technical solution, and the preset primary synchronization signal detection threshold may be an empirical value or a simulation value in the existing technology.

As a variant embodiment, interference cancellation may be performed before the detection of the received PSS. After that, PSS is detected.

Further, if the PSS detection is successful, the SSS can be detected. Specifically, after the SSS is received, the SSS can be transformed into the frequency domain through FFT transformation to obtain the SSS frequency domain received sequence. Afterwards, a correlation operation may be performed on the SSS frequency domain received sequence and the local SSS frequency domain sequence. Both the SSS frequency domain reception sequence and the local SSS frequency domain sequence include odd sequences and even sequences.

During SSS detection, in order to prevent missed detection caused by a single SSS correlation value threshold, a correlation operation may be performed on the odd sequence and the even sequence in the SSS frequency domain sequence respectively.

Considering that the even sequence of the SSS frequency domain receiving sequence is different from the odd sequence, the even sequence and the odd sequence of the SSS frequency domain receiving sequence may be obtained by means of interval extraction. Afterwards, correlation operations can be performed with the even sequence and the odd sequence of the local SSS frequency domain sequence to obtain respective correlation results.

Further, if the PSS satisfies the preset detection success condition, the cell associated with the PSS and the SSS may be used as a candidate cell. The preset detection success condition may be: the detection result of the SSS frequency domain sequence is greater than the preset first detection threshold, or the detection result of the odd sequence in the SSS is greater than the preset second detection threshold.

If R _even represents the correlation value of the even sequence, R _odd represents the correlation value of the odd sequence, R _sss represents the detection result of the SSS frequency domain received sequence, THr1 represents the preset first detection threshold, THr2 Indicates the preset second detection threshold, then as long as any one of the following two judgment conditions is satisfied, it means that the PSS and the SSS are successfully detected:

Judgment condition 1a: R _sss =R _even +R _odd >THr1,

Judgment condition 1b: R _odd > THr2,

Wherein, the judgment condition 1a is to use the correlation value of the even sequence and the odd sequence to combine the gain to deal with the SSS detection when the signal is weak. Judgment condition 1b eliminates the influence of falsely high correlation values that may appear on the even sequence. In general, THr1 is greater than THr2. The setting of THr1 and THr2 is to ensure that there is no missed detection, and the low false alarm rate is the benchmark. The specific threshold value can be obtained through simulation or actual measurement.

In step S102, after each candidate cell is obtained, each candidate cell may be grouped.

相同，且基本同步的候选小区划分为同一组，即同一候选小区组内的各小区的

相同，并且各小区间基本同步，其中，

表示物理小区组的组内标识。所述基本同步指的是对于基于所述主同步信号估计得到的各个候选小区各自的定时时间，任意两个小区之间的定时偏差不超出预设时长。In specific implementation, each candidate cell may be

The candidate cells that are the same and basically synchronized are divided into the same group, that is, the cells in the same candidate cell group

are the same, and the cells are basically synchronized, wherein,

Indicates the intra-group identifier of the physical cell group. The basic synchronization refers to that the timing deviation between any two cells does not exceed a preset duration for the respective timing times of each candidate cell estimated based on the primary synchronization signal.

As a non-limiting example, after the PSS detects and estimates the timing of each cell, if the timing deviation between the two cells does not exceed the Extended Walker Channel Model (Extended Pedestrian Channel Model) defined in 3GPP protocol 36.104 Pedestrian Amodel (EPA for short), Extended Vehicular Amodel (EVA), Extended Typical Urban model (ETU), High-Speed Train (HST) channel model Maximum multipath delay spread, then the two cells are basically synchronized.

After the candidate cell groups are obtained, the a priori cells in each candidate cell group can be determined. The a priori cell refers to a real cell or a candidate cell with the best signal quality detected in advance among multiple candidate cells at the same frequency point. For example, within the same candidate cell group, a real cell obtained in advance or a candidate cell with the best signal quality in the candidate cell group.

In a specific implementation, the prior cell may be a real cell that has been detected under the same frequency point, such as a resident serving cell (Serving Cell), and the reference signal received power (Reference Signal Received Power, RSRP for short) of the serving cell is ) is greater than or equal to -110 decibel milliwatts (dBm). Alternatively, the prior cell may be the cell with the strongest signal quality in the candidate cell group.

In step S103, after determining the a priori cell in the candidate cell group, the UE may judge the remaining candidate cells in the candidate cell group to determine whether the remaining candidate cells are false cells.

If it is a fake cell, the candidate cell can be deleted, and if it is not a fake cell, the candidate cell can be regarded as a detected real cell.

In a specific implementation, when judging whether a candidate cell is a fake cell, the m 0 sequence and m 1 sequence of a priori cells in each candidate cell group and the m ₀ sequence and m ₁ sequence of the candidate cell may be determined first.

Afterwards, if the candidate cell simultaneously satisfies the following four judgment conditions: judgment condition 3a, judgment condition 3b, judgment condition 3c and judgment condition 3d, the candidate cell is judged as a false detection cell.

Judgment condition 3a: When in time slot 0, the m ₀ sequence of the candidate cell and the m ₀ sequence of the prior cell are the same sequence, and when in time slot 5, the m ₁ sequence of the candidate cell is the same as the above The m ₁ sequence of the a priori cell is the same sequence.

Judgment condition 3b: R _odd ≤ THr2, that is, the detection result of the odd sequence in the SSS frequency domain sequence corresponding to the current candidate cell does not exceed the preset second detection threshold. If the correlation value R _odd of the odd sequence is low, it means that the signal of the current candidate cell is weak, and there is a possibility of false detection.

Judgment condition 3c: R _even ≤ THr3, that is, the detection result of the even sequence in the SSS frequency domain sequence corresponding to the current candidate cell does not exceed the preset third detection threshold. THr3 represents the preset third detection threshold, which is determined based on the prior cell and is proportional to the even sequence detection result of the prior cell.

Judgment condition 3d: R _even /R _odd ≥ THr4, that is, the quotient of the detection result of the odd sequence and the detection result of the even sequence does not exceed a preset fourth detection threshold. THr4 represents the preset fourth detection threshold, which is also determined based on the prior cell. If the quotient of R _even and R _odd is not lower than THr4, it means that the correlation value of the SSS even sequence may be affected by the prior cell.

The value of THr3 is related to R _{even_known} . R _{even_known} represents the correlation value of the even sequence of the prior cell in the candidate cell group where the candidate cell is located. The value of THr4 is related to THr4 _known . THr4 is _known to be predetermined according to the a priori cell, generally not lower than 3dB, and the specific value can be determined by simulation or actual measurement.

It should be noted that the values of THr3 and THr4 are also related to the timing offset of the prior cells in the candidate cell group where they are located. Specifically, after determining the timing deviation between the candidate cell and the prior cell, THr3 and THr4 may be fine-tuned according to the timing deviation, as follows:

THr3=α×THr3 _{even_known} ,

THr4=β×THr4 _known ,

Among them, α and β are fine-tuning coefficients. If the timing of the candidate cell and the prior cell is the same, the value of α and β is 1; otherwise, the values of THr3 and THr4 are related to the timing deviation and channel attenuation. , and the specific value can be determined by protocol channel definition, simulation or actual measurement.

Taking the ETU channel as an example, the maximum delay can reach 9.6 samples of 1.92MHz (Sample), which is rounded to 10 samples of 1.92MHz, so the fine-tuning coefficients of α and β can be respectively defined as 2×10+1=21 groups . The α and β values of each group can be determined according to the attenuation of each tap (Tap) of the ETU channel and simulation.

Further, if the candidate cell is determined to be a false detection cell, the candidate cell is deleted. After that, the other non-a priori cells in the candidate cell group may continue to be judged to judge whether the other candidate cells are false detection cells one by one. If yes, the fake cell is still deleted, if not, it is regarded as the real cell obtained by detection, and the detection process ends until the remaining candidate cells in the candidate cell group are traversed.

For other candidate cell groups, the above detection process is also adopted, so that each false detection cell can be deleted, and finally the cell detection is completed.

FIG. 2 is a schematic flowchart of still another cell detection method according to an embodiment of the present invention. For each UE, referring to FIG. 2 , step S201 is first performed, that is, cell detection, for example, detection of received PSS and SSS.

Next, step S202 is executed. Does the candidate cell satisfy the judgment condition I? That is, it is judged whether the cell detection result of the current candidate cell satisfies the judgment condition I, and the judgment condition I includes: the detection result of the PSS is greater than the preset primary synchronization signal detection threshold, and the detection result of the SSS is greater than the preset a first detection threshold; or, the detection result of the PSS is greater than the preset primary synchronization signal detection threshold, and the detection result of the odd sequence in the SSS is greater than the preset second detection threshold.

If the judgment condition I is satisfied, step S203 may be executed, namely grouping each candidate cell that meets the judgment condition I to obtain at least one candidate cell group, and determining the prior cells included in each candidate cell group. For example, within the same candidate cell group, the real cell detected in advance or the candidate cell with the best signal quality in the candidate cell group may be regarded as the priori cell; if not, the cell detection process ends.

Further, step S204 may be executed to judge whether other candidate cells satisfy the judgment condition II, wherein the judgment condition II may include: the judgment condition 3a, the judgment condition 3b, the judgment condition 3c and the judgment condition in the technical solution of the method shown in FIG. 1 . 3d, not repeated here.

If the judgment condition II is satisfied, indicating that the candidate cell is a false detection cell, the candidate cell is deleted in step S205; if not, the candidate cell is retained and continues to judge whether other candidate cells satisfy the judgment condition II.

Further, step S206 may be performed, that is, whether to traverse all the candidate cell groups? If yes, the flow ends, and if no, turn to step S204 to continue to judge whether other candidate cells satisfy the judgment condition II.

From the above, through the technical solutions provided by the embodiments of the present invention, the cell detection performance of the terminal can be improved. Especially when the prior cell information is known, the probability of missed detection and false detection of cell detection can be reduced, thereby further improving the cell detection performance of the terminal.

FIG. 3 is a schematic structural diagram of a cell detection apparatus according to an embodiment of the present invention. The cell detection apparatus 3 may implement the above-mentioned technical solutions of the methods shown in FIG. 1 and FIG. 2 , and be performed by a terminal, such as an LTE UE.

Specifically, the cell detection device 3 may include: a detection module 31, adapted to detect the received primary synchronization signal and the secondary synchronization signal, so as to obtain a candidate cell associated with the successfully detected primary synchronization signal and the secondary synchronization signal; The grouping module 32 is adapted to group each candidate cell to obtain at least one candidate cell group; the judging module 33 is adapted to determine whether the candidate cell is a false cell for each candidate cell in each candidate cell group, if If yes, delete the candidate cell, if not, take the candidate cell as the detected cell.

相同，且基本同步的候选小区划分为同一组，其中，

表示物理小区组的组内标识，所述基本同步指的是对于基于所述主同步信号估计得到的各个候选小区各自的定时时间，任意两个小区之间的定时偏差不超出预设时长。In a specific implementation, the grouping module 32 is adapted to group each candidate cell in the following manner:

The candidate cells that are the same and basically synchronized are divided into the same group, wherein,

Indicates the intra-group identifier of the physical cell group, and the basic synchronization means that the timing deviation between any two cells does not exceed a preset duration for the respective timing times of each candidate cell estimated based on the primary synchronization signal.

In a specific implementation, the secondary synchronization signal includes an odd sequence, and the detection module 31 may include: a first detection sub-module 311, adapted to detect the received primary synchronization signal; a second detection sub-module 312, adapted to When the detection result of the primary synchronization signal is greater than the preset primary synchronization signal detection threshold, the received secondary synchronization signal is detected; the first determination sub-module 313, if the secondary synchronization signal meets the preset detection success condition, then The first determination sub-module 313 is adapted to use the cell associated with the primary synchronization signal and the secondary synchronization signal as a candidate cell; wherein, the preset detection success condition is: the detection result of the secondary synchronization signal is greater than the preset first. A detection threshold, or the detection result of the odd sequence in the secondary synchronization signal is greater than a preset second detection threshold.

In a specific implementation, the cell detection device 3 may further include: a determination module 34, adapted to determine a priori cell before judging whether the candidate cell is a false cell, where the prior cell refers to a cell at the same frequency point Among the multiple candidate cells, a real cell detected in advance or a candidate cell with the best signal quality among the multiple candidate cells.

In a specific implementation, the secondary synchronization signal of the candidate cell includes an odd sequence and an even sequence, and the judgment module 33 may include: a second determination sub-module 331, adapted to determine the m ₀ sequence and m ₁ of the prior cell The judging sub-module 332 is adapted to judge the candidate cell as a false cell when the candidate cell satisfies all the following conditions: when it is in time slot 0, the m 0 sequence of the candidate cell is the same as the m ₀ sequence of the prior cell. The ₀ sequence is the same sequence, and when it is in time slot 5, the m ₁ sequence of the candidate cell and the m ₁ sequence of the prior cell are the same sequence, and the detection result of the odd sequence does not exceed the preset second. The detection threshold, the detection result of the even sequence does not exceed the preset third detection threshold, and the quotient of the detection result of the odd sequence and the detection result of the even sequence does not exceed the preset fourth detection threshold.

In a specific implementation, the preset third detection threshold may be determined based on the prior cell, and is proportional to the even sequence detection result of the prior cell.

In a specific implementation, the preset fourth detection threshold may be determined based on the a priori cell, and increases as the timing offset of the a priori cell increases.

For more content about the working principle and working mode of the cell detection apparatus 3, reference may be made to the relevant descriptions in FIG. 1 and FIG. 2 above, which will not be repeated here.

Further, an embodiment of the present invention further discloses a storage medium, on which computer instructions are stored, and when the computer instructions are run, the method and technical solutions described in the embodiments shown in FIG. 1 and FIG. 2 are executed. Preferably, the storage medium may include a computer-readable storage medium such as a non-volatile memory or a non-transitory memory. The storage medium may include ROM, RAM, magnetic or optical disks, and the like.

Further, an embodiment of the present invention further discloses a terminal, including a memory and a processor, the memory stores computer instructions that can run on the processor, and the processor executes the above diagram when running the computer instructions. 1 and the technical solutions of the methods described in the embodiments shown in FIG. 2 . Preferably, the terminal is an LTE UE.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the claims.

Claims (10)

1. a cell detection method, is characterized in that, comprises: Detecting the received primary synchronization signal and the secondary synchronization signal to obtain a candidate cell associated with the successfully detected primary synchronization signal and the secondary synchronization signal; Grouping each candidate cell to obtain at least one candidate cell group; For each candidate cell in each candidate cell group, determine whether the candidate cell is a false cell, if so, delete the candidate cell, if not, take the candidate cell as a detected cell. 2. The cell detection method according to claim 1, wherein each candidate cell is grouped in the following manner: put each candidate cell in

The candidate cells that are the same and basically synchronized are divided into the same group, wherein,

Indicates the intra-group identifier of the physical cell group, and the basic synchronization means that the timing deviation between any two cells does not exceed a preset duration for the respective timing times of each candidate cell estimated based on the primary synchronization signal. 3. The cell detection method according to claim 1, wherein the secondary synchronization signal comprises an odd sequence, and the received primary synchronization signal and the secondary synchronization signal are detected to obtain a successfully detected primary synchronization signal Candidate cells associated with the secondary synchronization signal include: Detect the received primary synchronization signal; When the detection result of the primary synchronization signal is greater than the preset primary synchronization signal detection threshold, detect the received secondary synchronization signal; If the secondary synchronization signal satisfies a preset detection success condition, the cell associated with the primary synchronization signal and the secondary synchronization signal is used as a candidate cell; The preset detection success condition is: the detection result of the secondary synchronization signal is greater than the preset first detection threshold, or the detection result of the odd sequence in the secondary synchronization signal is greater than the preset second detection threshold. 4. The cell detection method according to claim 3, wherein before judging whether the candidate cell is a false cell, the cell detection method further comprises: A priori cell is determined, where the priori cell refers to a real cell detected in advance in multiple candidate cells at the same frequency point or a candidate cell with the best signal quality among the multiple candidate cells. 5 . The cell detection method according to claim 4 , wherein the secondary synchronization signal of the candidate cell includes an odd sequence and an even sequence, and the judging whether the candidate cell is a false cell comprises: determining the a priori cell. 6 . The m ₀ sequence and m ₁ sequence of ; When the candidate cell satisfies all the following conditions, it is judged that the candidate cell is a false cell: When in time slot 0, the m 0 sequence of the candidate cell and the m ₀ sequence of the prior cell are the same sequence, and when in time slot 5, the m ₁ sequence of the candidate cell and the prior cell's m ₀ sequence are the same sequence. The m ₁ sequence is the same sequence, The detection result of the odd sequence does not exceed the preset second detection threshold, The detection result of the even sequence does not exceed the preset third detection threshold, The quotient of the detection result of the odd sequence and the detection result of the even sequence does not exceed a preset fourth detection threshold. 6 . The cell detection method according to claim 5 , wherein the preset third detection threshold is determined based on the prior cell, and is proportional to an even sequence detection result of the prior cell. 7 . 7 . The cell detection method according to claim 5 , wherein the preset fourth detection threshold is determined based on the a priori cell, and increases as the timing offset of the a priori cell increases. 8 . big. 8. A cell detection device, comprising: The detection module is adapted to detect the received primary synchronization signal and the secondary synchronization signal, so as to obtain a candidate cell associated with the successfully detected primary synchronization signal and the secondary synchronization signal; a grouping module, adapted to group each candidate cell to obtain at least one candidate cell group; The judging module is adapted to judge whether the candidate cell is a false cell for each candidate cell in each candidate cell group, if so, delete the candidate cell, if not, take the candidate cell as the detected cell. 9 . A storage medium having computer instructions stored thereon, wherein the computer instructions execute the steps of the method according to any one of claims 1 to 7 when the computer instructions are executed by a processor. 10 . 10. A terminal comprising a memory and a processor, wherein the memory stores computer instructions that can be run on the processor, wherein the processor executes claims 1 to 7 when the processor runs the computer instructions The steps of any one of the methods.

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