CN113543301A - Cell synchronous tracking method, device, equipment and computer readable storage medium - Google Patents
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Abstract
The disclosure provides a cell synchronization tracking method, a device, equipment and a computer readable storage medium. The cell synchronization tracking method comprises the following steps: acquiring air interface signals based on a target frequency point to obtain time domain information of a plurality of cells; analyzing the time domain information of the cell to obtain the synchronization information of the cell; the synchronization information comprises a secondary synchronization signal; carrying out transformation processing on the time domain information of the cell to obtain corresponding frequency domain data information; and performing synchronous tracking by using the auxiliary synchronous signal based on the frequency domain data information. According to the scheme of the embodiment of the disclosure, the problem that modulo three interference is easy to generate in the related technology can be solved, and the accuracy of cell synchronous tracking is improved.
Description
Technical Field
The disclosed embodiments relate to the field of communications technologies, and in particular, to a cell synchronization tracking method, device, and apparatus, and a computer-readable storage medium.
Background
Since the receiver and the base station are not synchronous systems, the clock timing of the receiver and the base station are not completely consistent, which causes the cell synchronization point searched by the receiver to shift with time, and the purpose of synchronization tracking is to continuously correct the synchronization point shift.
In 4G, synchronization tracking is usually performed using a Cell Reference Signal (CRS); whereas the 5G protocol cancels CRS, 5G tracking is implemented in the related art, and cell Synchronization is usually implemented by Primary Synchronization Signal (PSS).
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The inventor finds that, since the number of Physical Cell IDs (PCIs) of 5G is 1008, which is twice that of 4G, cells are relatively denser, and if PSS is used for synchronization tracking, the problem of modulo three interference is easily generated, thereby affecting the accuracy of Cell synchronization tracking.
The embodiment of the disclosure provides a cell synchronization tracking method, a cell synchronization tracking device and a computer readable storage medium, which can solve the problem that modulo three interference is easy to generate in the related art and improve the accuracy of cell synchronization tracking.
In a first aspect, an embodiment of the present disclosure provides a cell synchronization tracking method, including:
acquiring air interface signals based on a target frequency point to obtain time domain information of a plurality of cells;
analyzing the time domain information of the cell to obtain the synchronization information of the cell; the synchronization information comprises a secondary synchronization signal;
carrying out transformation processing on the time domain information of the cell to obtain corresponding frequency domain data information;
and performing synchronous tracking by using the auxiliary synchronous signal based on the frequency domain data information.
In some embodiments of the present disclosure, the plurality of cells are co-frequency cells; the frequency domain data information includes first frequency domain data and second frequency domain data, and the transforming the time domain information of the cell to obtain corresponding frequency domain data information includes:
judging to obtain a reference cell based on the synchronization information of the cell;
performing time-frequency transformation on the time domain information of the reference cell to obtain the first frequency domain data of the reference cell;
and performing time offset compensation on the first frequency domain data of the reference cell to obtain second frequency domain data of a non-reference cell.
In some specific embodiments of the present disclosure, the performing synchronization tracking by using the secondary synchronization signal based on the frequency domain data information includes:
and performing synchronous tracking by using an auxiliary synchronous signal based on the first frequency domain data and the second frequency domain data to obtain first synchronous tracking information of the reference cell and second synchronous tracking information of the non-reference cell.
In some specific embodiments of the present disclosure, after performing the synchronization tracking by using a secondary synchronization signal based on the first frequency domain data and the second frequency domain data to obtain the first synchronization tracking information of the reference cell and the second synchronization tracking information of the non-reference cell, the method further includes:
if the synchronization point of the reference cell changes, updating the synchronization point of the first frequency domain data based on the first synchronization tracking information;
and if the synchronization point of the non-reference cell changes, updating the time offset value of the second frequency domain data based on the second synchronization tracking information.
In some embodiments of the present disclosure, the updating the synchronization point of the first frequency domain data based on the first synchronization tracking information is performed if the synchronization point of the reference cell changes; if the synchronization point of the non-reference cell changes, after updating the time offset value of the second frequency domain data based on the second synchronization tracking information, the method further includes:
and if the reference cell does not meet the reference condition, updating and replacing the reference cell.
In some embodiments of the disclosure, the determining to obtain the reference cell based on several pieces of cell information includes:
screening out a plurality of unsynchronized cells based on a plurality of pieces of synchronization information;
carrying out extension processing on the synchronization points of the plurality of unsynchronized cells to obtain a plurality of synchronization point detection ranges;
if the synchronization point detection range comprises the synchronization point of the cell with the optimal signal quality, taking the corresponding unsynchronized cell as a first candidate cell;
if only one first candidate cell exists, taking the corresponding unsynchronized cell as the reference cell;
wherein other cells within the synchronization point detection range of the reference cell are the non-reference cells.
In some embodiments of the disclosure, the extending the synchronization points of the unsynchronized cells to obtain a plurality of synchronization point detection ranges includes:
and taking the synchronization points of the plurality of unsynchronized cells as time starting points, and extending the time range of the length of the cyclic prefix to obtain a plurality of detection ranges of the synchronization points.
In some embodiments of the disclosure, after performing the step of taking the non-out-of-synchronization cell as the reference cell if there is only one first candidate cell, the method further includes:
if there are a plurality of first candidate cells, selecting the non-out-of-step cell corresponding to the largest number of cell synchronization points in the synchronization point detection range from the first candidate cells as a second candidate cell;
and if only one second candidate cell exists, taking the corresponding unsynchronized cell as the reference cell.
In some embodiments of the disclosure, after performing the step of taking the non-out-of-synchronization cell as the reference cell if there is only one second candidate cell, the method further includes:
and if the second candidate cells are multiple, taking the non-desynchronized cell with the optimal signal quality from the second candidate cells as the reference cell.
In some specific embodiments of the present disclosure, the performing time offset compensation on the first frequency domain data of the reference cell to obtain the second frequency domain data of a non-reference cell includes:
performing difference operation on the synchronization point of the non-reference cell and the synchronization point of the reference cell to obtain a time offset value;
and performing compensation processing on the first frequency domain data based on the time offset value to obtain the second frequency domain data of the non-reference cell.
In a second aspect, an embodiment of the present disclosure further provides a cell synchronization tracking apparatus, including:
the first module is used for acquiring air interface signals based on the target frequency points to obtain time domain information of a plurality of cells;
a second module, configured to analyze the time domain information of the cell to obtain synchronization information of the cell; the synchronization information comprises a secondary synchronization signal;
a third module, configured to perform transform processing on the time domain information of the cell to obtain corresponding frequency domain data information;
and a fourth module, configured to perform synchronization tracking by using the secondary synchronization signal based on the frequency domain data information.
In some embodiments of the present disclosure, the plurality of cells are co-frequency cells; the frequency domain data information comprises first frequency domain data and second frequency domain data, the third module comprises:
a fifth module, configured to determine to obtain a reference cell based on the synchronization information of the cell;
a sixth module, configured to perform time-frequency transformation on the time domain information of the reference cell to obtain the first frequency domain data of the reference cell;
a seventh module, configured to perform time offset compensation on the first frequency domain data of the reference cell to obtain the second frequency domain data of a non-reference cell.
In some specific embodiments of the present disclosure, the fourth module comprises:
an eighth module, configured to perform synchronous tracking by using an auxiliary synchronization signal based on the first frequency domain data and the second frequency domain data, to obtain first synchronous tracking information of the reference cell and second synchronous tracking information of the non-reference cell.
In a third aspect, an embodiment of the present disclosure further provides an apparatus, including: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the cell synchronization tracking method as described above in the first aspect when executing the computer program.
In a fourth aspect, an embodiment of the present disclosure further provides a computer-readable storage medium storing computer-executable instructions for performing the cell synchronization tracking method according to the first aspect.
The embodiment of the disclosure comprises: acquiring air interface signals based on a target frequency point to obtain time domain information of a plurality of cells; analyzing the time domain information of the cell to obtain the synchronization information of the cell; the synchronization information includes a secondary synchronization signal; carrying out transformation processing on the time domain information of the cell to obtain corresponding frequency domain data information; and performing synchronous tracking by using the auxiliary synchronous signal based on the frequency domain data information. According to the scheme provided by the embodiment of the disclosure, firstly, air interface signals are collected based on target frequency points, so that time domain information of a plurality of cells can be obtained; analyzing the time domain information to obtain the synchronous information of the cell, wherein the synchronous information comprises an auxiliary synchronous signal; then, the time domain information of the cell is transformed, so that frequency domain data information corresponding to the time domain information is obtained; finally, based on frequency domain data information, the auxiliary synchronization signal is utilized to perform cell synchronization tracking processing, and a main synchronization signal is not adopted in the cell synchronization tracking process, so that the problem that modulo three interference is easy to generate in the related technology can be solved, and the accuracy of cell synchronization tracking is improved.
Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the disclosure. The objectives and other advantages of the disclosure may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosed embodiments and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the example serve to explain the principles of the disclosure and not to limit the disclosure.
Fig. 1 is a flowchart of a cell synchronization tracking method according to an embodiment of the present disclosure;
fig. 2 is a flowchart illustrating a transformation process of a cell synchronization tracking method according to an embodiment of the present disclosure;
fig. 3 is a flowchart of a cell synchronization tracking method according to another embodiment of the present disclosure;
fig. 4 is a flowchart of a cell synchronization tracking method according to another embodiment of the present disclosure;
fig. 5 is a flowchart of a cell synchronization tracking method according to another embodiment of the present disclosure;
fig. 6 is a flowchart of a decision reference cell of a cell synchronization tracking method according to an embodiment of the present disclosure;
fig. 7 is a flowchart of a synchronization point extension process of a cell synchronization tracking method according to an embodiment of the present disclosure;
fig. 8 is a flowchart of a decision reference cell of a cell synchronization tracking method according to another embodiment of the present disclosure;
fig. 9 is a flowchart of a decision reference cell of a cell synchronization tracking method according to another embodiment of the present disclosure;
fig. 10 is a flow chart of time offset compensation of a cell synchronization tracking method according to an embodiment of the present disclosure;
fig. 11 is a flowchart illustrating a transformation process of a cell synchronization tracking method according to another embodiment of the present disclosure;
fig. 12 is a flowchart illustrating a transformation process of a cell synchronization tracking method according to another embodiment of the present disclosure;
fig. 13 is a flowchart illustrating a transformation process of a cell synchronization tracking method according to another embodiment of the present disclosure;
fig. 14 is a schematic structural diagram of an apparatus provided by an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the disclosure and are not intended to limit the disclosure.
In the description of the present disclosure, the number is one or more, the number is two or more, and greater than, less than, more than, etc. are understood as excluding the number, and greater than, less than, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present disclosure, unless otherwise expressly limited, terms such as set, mounted, connected, etc., should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present disclosure in consideration of the detailed contents of the technical solutions.
The present disclosure provides a cell synchronization tracking method, device, equipment and computer readable storage medium, firstly collecting air interface signals based on target frequency points, thereby obtaining time domain information of a plurality of cells; analyzing the time domain information to obtain the synchronous information of the cell, wherein the synchronous information comprises an auxiliary synchronous signal; then, the time domain information of the cell is transformed, so that frequency domain data information corresponding to the time domain information is obtained; finally, based on frequency domain data information, the auxiliary synchronization signal is utilized to perform cell synchronization tracking processing, and a main synchronization signal is not adopted in the cell synchronization tracking process, so that the problem that modulo three interference is easy to generate in the related technology can be solved, and the accuracy of cell synchronization tracking is improved.
The embodiments of the present disclosure will be further explained with reference to the drawings.
As shown in fig. 1, fig. 1 is a flowchart of a cell synchronization tracking method according to an embodiment of the present disclosure. The cell synchronization tracking method includes, but is not limited to, step S100, step S200, step S300, and step S400:
step S100, acquiring air interface signals based on target frequency points to obtain time domain information of a plurality of cells;
step S200, analyzing the time domain information of the cell to obtain the synchronous information of the cell; the synchronization information includes a secondary synchronization signal;
step S300, the time domain information of the cell is transformed to obtain corresponding frequency domain data information;
and step S400, performing synchronous tracking by using the auxiliary synchronous signal based on the frequency domain data information.
It should be noted that, in this embodiment, air interface signals are collected based on a target frequency point, so that time domain information of a plurality of cells can be obtained; analyzing the time domain information to obtain the synchronous information of the cell, wherein the synchronous information comprises an auxiliary synchronous signal; then, the time domain information of the cell is transformed, so that frequency domain data information corresponding to the time domain information is obtained; finally, based on frequency domain data information, the auxiliary synchronization signal is utilized to perform cell synchronization tracking processing, and a main synchronization signal is not adopted in the cell synchronization tracking process, so that the problem that modulo three interference is easy to generate in the related technology can be solved, and the accuracy of cell synchronization tracking is improved.
It can be understood that the air interface signal in this embodiment may be a 5G air interface signal; the synchronization information in this embodiment includes an auxiliary synchronization signal, and the cell synchronization tracking processing is performed by using the auxiliary synchronization signal without using a main synchronization signal, thereby well avoiding modulo three interference caused by the main synchronization signal.
It should be noted that, according to the frequency and Signal bandwidth of the 5G cell Synchronization Signal and PBCH block (SSB), 5G air interface Signals are collected, a Primary Synchronization Signal (PSS) is analyzed to obtain NID2 (range {0, 1, 2}) and a time domain coarse Synchronization point, a Secondary Synchronization Signal (SSS) is analyzed to obtain NID1 (range {0, 1 … 335}) and a time domain fine Synchronization point, and a formula is used according to the frequency and Signal bandwidth of the 5G cell Synchronization Signal and PBCH block (SSB)
PCI＝(3×NID1)+NID2
A Cell Physical Cell Identity (PCI) is calculated, the range is {0, 1 … 1007}, a Physical Broadcast Channel (PBCH) is then analyzed to obtain a Master Information Block (MIB), time domain and frequency domain Information of a System Information Block 1 (SIB 1) is indicated in the MIB, finally, the SIB1 is analyzed to obtain Cell System Information including a Tracking Area Code (TAC), a Cell number (Cell-Identity, CID), initial fractional Bandwidth (BWP) Information, and Reference Signal Reception Power (RSRP) and Reference Signal reception Quality (Reference Signal reception Quality, q) are calculated as Reference for the Cell Signal reception Quality. According to the steps, a plurality of cells corresponding to the PCIs can be solved by taking one SSB frequency point as a target frequency point, 5G multi-cell search is realized, and time domain information of a plurality of cells is obtained.
It can be understood that 5G air interface signals are collected, and then the primary synchronization signal, the secondary synchronization signal, the physical broadcast channel and the system message block are analyzed and processed, so that the initial time domain synchronization point, the cell system information, the reference signal receiving power and the reference signal receiving quality of the corresponding cell can be obtained.
It should be noted that the time domain synchronization point calculated in this example represents the difference between the actual empty data frame starting point and the sampling data frame starting point, and the range thereof is from 0 to a frame sampling point, that is, the synchronization point is greater than or equal to 0 and less than a frame sampling point, and the size of a frame sampling point is related to the actual sampling rate; the 5G sampling rates are 30.72MHz and 122.88MHz, and if the sampling rate is 30.72MHz, the corresponding sampling point is 307200 points for one frame, and if the sampling rate is 122.88MHz, the corresponding sampling point is 1228800 points for one frame.
In addition, in an embodiment, when a plurality of cells are co-frequency cells; in the case where the frequency domain data information includes the first frequency domain data and the second frequency domain data, as shown in fig. 2, the above step S300 may include, but is not limited to, step S310, step S320, and step S330.
Step S310, based on the synchronous information of the cell, judging to obtain a reference cell;
step S320, performing time-frequency transformation on the time domain information of the reference cell to obtain first frequency domain data of the reference cell;
step S330, time offset compensation is carried out on the first frequency domain data of the reference cell to obtain second frequency domain data of the non-reference cell.
It should be noted that, based on the acquired synchronization information of the plurality of cells, it is determined that the reference cell is obtained, and a precondition is prepared for cell synchronization. The first frequency domain data and the second frequency domain data are only attributed differently to distinguish the first frequency domain data and the second frequency domain data, that is, the first frequency domain data is frequency domain data belonging to a reference cell, and the second frequency domain data is frequency domain data belonging to a non-reference cell. According to the technical scheme, the reference cell is judged and screened out firstly, then time-frequency transformation is carried out on the time domain information of the reference cell to obtain the first frequency domain data of the reference cell, then time offset compensation is carried out on the first frequency domain data to obtain the second frequency domain data of the non-reference cell, time-frequency transformation processing is not needed to be carried out on all cells, the operation amount is reduced, and the synchronous tracking process is enabled to be simpler, more convenient and faster.
It should be noted that, for two cells with the same frequency, for example, taking cell a and cell B as an example, when a time domain synchronization point of cell B is larger than a time domain synchronization point of cell a, that is, in a time domain, the synchronization point of cell B is located behind the synchronization point of cell a, and a time value corresponding to the synchronization point of cell B is larger than a time value corresponding to the synchronization point of cell a and does not exceed a CP (cyclic prefix) range, time offset can be compensated by using frequency domain data of cell a to obtain frequency domain data of cell B.
It is understood that the time-frequency Transform may be a Fast Fourier Transform (FFT), which implements a time-domain to frequency-domain Transform process.
In addition, in an embodiment, as shown in fig. 3, the step S400 may include, but is not limited to, the step S410.
Step S410, based on the first frequency domain data and the second frequency domain data, performing synchronous tracking by using the secondary synchronization signal to obtain first synchronous tracking information of the reference cell and second synchronous tracking information of the non-reference cell.
It can be understood that the first synchronization tracking information and the second synchronization tracking information are only information obtained by distinguishing the two synchronization tracking information belonging to different cell synchronization tracking processes; the first synchronization tracking information is attributed to a reference cell and the second synchronization tracking information is attributed to a non-reference cell.
It should be noted that, the SSS is used to perform synchronization tracking in the frequency domain, and calculate synchronization tracking information of each cell. The SSB period of the 5G cell is 20ms at minimum, and the synchronization tracking period of the present embodiment is determined according to the SSB period. In each SSB period, 8 SSBs are in total, firstly, the signal energy intensity of each SSB is calculated, and the SSB with the strongest signal energy is found; and then, frequency domain data corresponding to SSS in the strongest SSB and a local SSS sequence are taken out to calculate channel estimation, N-point IFFT is carried out on the channel estimation value, and a peak point pos of a Power Delay Profile (PDP) is obtained through calculation. Illustratively, the time offset value offset may be further determined according to the following formula:
if(pos<N/2)
offset＝pos；
else
offset＝pos-N；
End；
in addition, in an embodiment, as shown in fig. 4, after the step S410 is executed, the steps may further include, but are not limited to, the step S500 and the step S600.
Step S500, if the synchronization point of the reference cell changes, updating the synchronization point of the first frequency domain data based on the first synchronization tracking information;
in step S600, if the synchronization point of the non-reference cell changes, the time offset value of the second frequency domain data is updated based on the second synchronization tracking information.
Note that, if there is a change in the reference cell synchronization point, the FFT-processed synchronization point is updated based on the first synchronization tracking information. In order to avoid the processing complication caused by frequently updating the synchronization point of the FFT processing and the abnormal synchronization tracking caused by the excessively large calculation deviation of the synchronization point, a range may be set in the actual processing, for example, 5 or more abs (offset) or less than 500 may be set, and when the absolute value of the deviation of the calculated synchronization point is within the range, the synchronization point of the FFT processing is updated. And when the synchronization point of the non-reference cell changes, updating the time offset value of the non-reference cell relative to the synchronization point used by the FFT processing, namely the difference value with the synchronization point of the reference cell based on the second synchronous tracking information.
In addition, in an embodiment, as shown in fig. 5, after the step S600 is performed, the method may further include, but is not limited to, the step S700.
Step S700, if the reference cell does not satisfy the reference condition, updating and replacing the reference cell.
It should be noted that, after all cells are subjected to a round of synchronization tracking, the sequence of synchronization points may change, and some cells may lose synchronization due to synchronization tracking failure, and meanwhile, the cell search module searches out a new cell that may represent that the previous reference cell does not satisfy the reference condition, and needs to re-determine to select the new reference cell. While the SSB period of the 5G cell is 20ms at minimum, the synchronization tracking period of the present embodiment is determined according to the SSB period. In practice, the sequence and difference of the synchronization points of each cell are basically kept unchanged on the premise of accurate synchronization tracking calculation, and the synchronization points of each cell shift in one direction along with time. The out-of-step cell refers to a cell which can obtain a synchronization point through synchronous signal detection correlation before, and the cell is considered out of step if the cell cannot be synchronized again within a period of time. If the reference cell is out of synchronization, the reference cell needs to be updated and determined.
In addition, in an embodiment, as shown in fig. 6, the step S310 may include, but is not limited to, step S311, step S312, step S313, and step S314.
Step S311, screening out a plurality of unsynchronized cells based on a plurality of synchronous information;
step S312, carrying out extension processing on the synchronization points of a plurality of unsynchronized cells to obtain a plurality of synchronization point detection ranges;
step S313, if the synchronization point detection range includes the synchronization point of the cell with the optimal signal quality, the corresponding unsynchronized cell is taken as a first candidate cell;
step S314, if there is only one first candidate cell, using the corresponding unsynchronized cell as the reference cell.
It should be noted that the cells participating in the following determination are not out of synchronization; the out-of-step cell refers to a cell which can obtain a synchronization point through synchronous signal detection correlation before, and the cell is considered out of step if the cell cannot be synchronized again within a period of time. At the moment of judgment, the cells in the out-of-step state are filtered out firstly; firstly, carrying out extension processing on cell synchronization points to obtain corresponding synchronization point detection ranges; if the synchronization point detection range contains the synchronization point of the cell with the best signal quality, the cell is taken as a candidate cell; if only one candidate cell is determined as the reference cell; the cell with good signal quality is usually the one that the receiver system firstly needs to guarantee to be able to continuously and synchronously track and monitor, because the decoding accuracy of the cell with good signal is higher compared with the cell with poor signal, and peripheral User Equipment (UE) will also log in the cell with good signal preferentially, so that the value of synchronous tracking is higher. The parameters for commonly determining the best signal quality include RSRP and RSRQ, the embodiment preferentially determines the cell with the largest RSRQ as the cell with the best signal quality, and if a plurality of cells with the largest and the same RSRQ exist, further determines the cell with the largest RSRP as the cell with the best signal quality. The cell with the best signal quality may also be referred to as the strongest cell. It can be understood that, when determining the quality of the cell signal, the method is not limited to determining by RSRP and RSRQ, and all methods commonly used by those skilled in the art for determining the cell signal quality are the protection scope of this embodiment.
It is noted that other cells within the synchronization point detection range of the reference cell are non-reference cells.
In addition, in an embodiment, as shown in fig. 7, the step S312 may include, but is not limited to, step S3120.
And S3120, taking the synchronization points of the unsynchronized cells as time starting points, extending the time range of the length of the cyclic prefix, and obtaining a plurality of detection ranges of the synchronization points.
It should be noted that, the CP length of the first symbol of each slot in the 5G protocol is longer than the CP of other symbols, and in order to ensure that data of all symbols after time offset compensation is complete, the CP cyclic prefix length mentioned in this embodiment refers to the length of the short CP, and if the sampling rate is 30.72MHz, the short CP length is 72 points, and if the sampling rate is 122.88MHz, the short CP length is 288 points.
And for each cell, adding the CP cyclic prefix length to the own synchronization point of the cell to form a synchronization point range, and if the strongest cell synchronization point is in the range, taking the cell as a candidate cell. Illustratively, taking cell A as an example, if the cell A synchronization point is less than or equal to the strongest cell synchronization point is less than or equal to (cell A synchronization point + CP length), then cell A can be used as the candidate cell. When the synchronization point of the strongest cell is the minimum and no synchronization point of other cells is the same, if there is a candidate cell satisfying the above condition and only the strongest cell, the strongest cell is used as the reference cell.
In addition, in an embodiment, if there are a plurality of first candidate cells, as shown in fig. 8, after step S314 is executed, steps S315 and S316 may be further included, but are not limited thereto.
Step S315, if there are a plurality of first candidate cells, selecting the corresponding unsynchronized cell with the largest number of cell synchronization points in the synchronization point detection range from the first candidate cells as a second candidate cell;
step S316, if there is only one second candidate cell, the corresponding unsynchronized cell is used as the reference cell.
It should be noted that the cell with the largest number of cells in the synchronization point detection range is used as a candidate cell; if only one candidate cell is determined as the reference cell; the receiver system is often guaranteed to monitor more cells simultaneously, so that the number of cells in the synchronization point range is preferably larger.
In addition, in an embodiment, if there are a plurality of second candidate cells, as shown in fig. 9, after step S316 is executed, step S317 may be further included, but is not limited thereto.
Step S317, if there are a plurality of second candidate cells, the non-out-of-step cell with the best signal quality is taken from the second candidate cells as the reference cell.
If there are a plurality of conforming cells after the determination, the cell with the best signal quality is taken as the reference cell; under the same condition, the cell with the best signal quality is taken as a reference cell, so that the accuracy and the stability of subsequent synchronous tracking calculation are facilitated. It should be noted that the parameter for determining the signal quality includes RSRP and RSRQ, in this embodiment, the cell with the highest RSRQ is preferentially determined as the cell with the best signal quality, and if there are multiple cells with the highest RSRQ and the same RSRQ, the cell with the highest RSRP is further determined as the cell with the best signal quality.
In addition, in an embodiment, as shown in fig. 10, the step S330 may include, but is not limited to, the steps S331 and S332.
Step S331, carrying out difference operation on the synchronization point of the non-reference cell and the synchronization point of the reference cell to obtain a time offset value;
step S332, based on the time offset value, performing compensation processing on the first frequency domain data to obtain second frequency domain data of the non-reference cell.
It should be noted that, the time offset compensation is performed on the first frequency domain data of the reference cell to obtain the second frequency domain data of other non-reference cells with the same frequency. And calculating the time offset compensation value of each subcarrier frequency domain data point, namely the phase value needing compensation according to a time offset compensation value calculation formula. Before the non-reference cell synchronous tracking, the first frequency domain data of the reference cell needs to be compensated by using the current time offset compensation value, namely, the frequency domain data IQ value and the phase IQ value to be compensated are subjected to complex multiplication to obtain the frequency domain data IQ value of the non-reference cell after compensation.
Illustratively, the time offset compensation formula may be expressed as:
kStart＝(N-M)/2；
k＝rbStart+[0:Nsubcarrier-1]'；
angleBC＝exp(j*2*π*timeOffset*(k+kStart)./N)
description of the drawings: n represents the number of FFT points corresponding to the sampling rate, M represents the number of effective subcarriers corresponding to the sampling rate, and kStart represents the starting point of the effective subcarriers; k represents the subcarrier number corresponding to the frequency domain resource allocated by the cell to be processed; rbStart denotes a starting point for allocating frequency domain resources at a minimum subcarrier of an effective bandwidth (i.e., a subcarrier having a lowest frequency in the effective bandwidth)) For reference; n is a radical ofsubcarrierRepresenting the number of subcarriers occupied by the frequency domain resources of the signal to be calculated; timeOffset represents a time offset, in units of one sample point; angleBCIndicating the phase value that each subcarrier needs to be compensated for. the timeOffset represents the difference between the starting position of the time of the signal to be decoded and the starting position of the time domain of the reference signal, and is a positive value (i.e. the signal with the synchronization point after the synchronization point of the reference cell can be decoded by the present scheme). [0: X ]]Is a sequence of numbers stepped by 1.
In addition, in an embodiment, as shown in fig. 11, the step S320 may include, but is not limited to, the step S321.
Step S321, performing phase compensation and time-frequency transformation on the time domain information of the reference cell to obtain first frequency domain data of the reference cell.
It should be noted that, in the process of performing time-frequency transformation on the time domain information of the reference cell, phase compensation processing is also performed, so that the obtained first frequency domain data of the reference cell is more accurate.
In addition, in an embodiment, as shown in fig. 12, the step S321 may include, but is not limited to, step S3210, step S3211, and step S3212.
Step S3210, determining a frequency band center frequency according to a monitored part of the frequency band wide range, and calculating to obtain a first phase compensation value;
step S3211, phase compensation is performed on the time domain information of the reference cell based on the first phase compensation value to obtain compensated time domain data;
step S3212, performing fast Fourier transform on the compensated time domain data to obtain first frequency domain data of the reference cell
It should be noted that, according to the monitored BWP band range, the band center frequency is determined, the first phase compensation value is calculated, and the time domain information is compensated symbol by symbol according to the synchronization point of the reference cell. And performing complex multiplication on the time domain data IQ value and the phase IQ value to be compensated to obtain a compensated time domain data IQ value.
It should be noted that, unlike 4G, the 5G signal is transmitted with a phase rotation, so the receiving end needs to perform phase compensation during signal processing. Since only the multiplication operation is performed on the complex signal to compensate for the phase rotation, the effect of performing the multiplication operation in the time domain or the frequency domain is the same.
It should be noted that, the time-frequency transform is performed on the time-domain data after the phase compensation, and the FFT processing is performed according to the synchronization point of the reference cell, so as to obtain the frequency-domain data of the reference cell.
Illustratively, the phase compensation calculation is as follows:
imeId＝gnb.FirstNCP+[0:13]*ofdmLen；
angleValue＝exp(1i*2*pi*gnb.f0*timeId/gnb.SampleRate)；
wherein, the sub-carrier interval is 30KHz and one time slot contains 14 ofdm symbols according to the conventional CP consideration in the formula; firstncp denotes the CP length corresponding to the first ofdm symbol, and ofdm len denotes the length of one ofdm symbol.
Gnb. firstncp equals 88, offsmlen equals 1096 at 30.72M sample rate; 122.88M sample rate, gnb. firstncp equals 352, offsmlen equals 4384; samplerate denotes the sampling rate; f0 represents the transmit frequency, the initial cell search stage, corresponding to the center frequency of the initial BWP; at a bandwidth of 100M, corresponding to a center frequency of the bandwidth of 100M.
In addition, in an embodiment, as shown in fig. 13, the step S321 may include, but is not limited to, step S3213, step S3214, and step S3215.
Step S3213, performing fast Fourier transform on the time domain information of the reference cell to obtain initial frequency domain data of the reference cell;
step S3214, determining the center frequency of the frequency band according to a part of the monitored broadband range, and calculating to obtain a second phase compensation value;
step S3215, phase compensation is performed on the initial frequency domain data based on the second phase compensation value, to obtain first frequency domain data of the reference cell.
It should be noted that the method for acquiring frequency domain data of a reference cell provided in this embodiment differs from the above embodiments in that a time-frequency transform process is performed before a phase compensation process. Preferably, the phase compensation can be selected after the FFT processing, for example, at a sampling rate of 122.88MHz, the number of points to be processed in the time domain of a symbol is 4096, and the number of points to be processed in the frequency domain is 3276, so that the amount of computation required for processing the phase compensation in the frequency domain is less than that in the time domain.
It should be noted that the first phase compensation value and the second phase compensation value are distinguished, and only the order of performing the phase compensation processing and the time-frequency transformation processing is better described, and it should not be assumed that the first phase compensation value and the second phase compensation value are different.
In addition, an embodiment of the present disclosure further provides a cell synchronization tracking apparatus, including:
the first module is used for acquiring air interface signals based on the target frequency points to obtain time domain information of a plurality of cells;
the second module is used for analyzing the time domain information of the cell to obtain the synchronous information of the cell; the synchronization information includes a secondary synchronization signal;
the third module is used for carrying out transformation processing on the time domain information of the cell to obtain corresponding frequency domain data information;
and the fourth module is used for carrying out synchronous tracking by utilizing the auxiliary synchronous signal based on the frequency domain data information.
In some embodiments of the present disclosure, when a plurality of cells are co-frequency cells; the frequency domain data information includes first frequency domain data and second frequency domain data, and the third module includes:
a fifth module, configured to determine to obtain a reference cell based on synchronization information of the cell;
a sixth module, configured to perform time-frequency transformation on the time domain data of the reference cell to obtain first frequency domain data of the reference cell;
and the seventh module is used for performing time offset compensation on the first frequency domain data of the reference cell to obtain second frequency domain data of the non-reference cell.
In some specific embodiments of the present disclosure, the fourth module comprises:
and an eighth module, configured to perform synchronous tracking by using the auxiliary synchronization signal based on the first frequency domain data and the second frequency domain data, to obtain first synchronous tracking information of the reference cell and second synchronous tracking information of the non-reference cell.
It should be noted that the cell synchronization tracking apparatus may be an entity apparatus, and the apparatus may include a hardware module with corresponding functions; the cell synchronization tracking device may also be a virtual device, and the virtual device may include a virtual module with corresponding functions.
It should be noted that, since the cell synchronization tracking apparatus in this embodiment and the cell synchronization tracking method in the foregoing embodiment are based on the same inventive concept, corresponding contents in the method embodiment are also applicable to this system embodiment, and are not described herein again.
In addition, as shown in fig. 14, an embodiment of the present disclosure also provides an apparatus 800, the apparatus 800 including: memory 820, processor 810, and a computer program stored on memory 820 and executable on processor 810.
The processor 810 and the memory 820 may be connected by a bus or other means.
The memory 820, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs as well as non-transitory computer executable programs. Further, the memory 820 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 820 may optionally include memory 820 located remotely from the processor 810, which may be connected to the processor via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
It should be noted that, when executed by a processor in the foregoing device embodiment, the processor may be enabled to execute the cell synchronization tracking method in the foregoing embodiment, for example, to execute the above-described method steps S100 to S400 in fig. 1, the method steps S310 to S330 in fig. 2, the method step S410 in fig. 3, the method steps S500 to S600 in fig. 4, the method step S700 in fig. 5, the method steps S311 to S314 in fig. 6, the method step S3120 in fig. 7, the method steps S315 to S316 in fig. 8, the method step S317 in fig. 9, the method steps S331 to S332 in fig. 10, the method step S321 in fig. 11, the method steps S3210 to S3212 in fig. 12, and the method steps S3213 to S3215 in fig. 13.
It should be noted that, since the device 800 in this embodiment is based on the same inventive concept as the cell synchronization tracking method in the foregoing embodiment, corresponding contents in the method embodiment are also applicable to this system embodiment, and are not described herein again.
Further, an embodiment of the present disclosure also provides a computer-readable storage medium storing computer-executable instructions, the computer-executable instructions are executed by a processor or controller, e.g., by a processor in the above-described device embodiments, the processor may be enabled to execute the cell synchronization tracking method in the above embodiment, for example, execute the above-described method steps S100 to S400 in fig. 1, method steps S310 to S330 in fig. 2, method step S410 in fig. 3, method steps S500 to S600 in fig. 4, method step S700 in fig. 5, method steps S311 to S314 in fig. 6, method step S3120 in fig. 7, method steps S315 to S316 in fig. 8, method step S317 in fig. 9, method steps S331 to S332 in fig. 10, method step S321 in fig. 11, method steps S3210 to S3212 in fig. 12, and method steps S3213 to S3215 in fig. 13.
One of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
While the present disclosure has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (15)
1. A cell synchronization tracking method, comprising:
acquiring air interface signals based on a target frequency point to obtain time domain information of a plurality of cells;
analyzing the time domain information of the cell to obtain the synchronization information of the cell; the synchronization information comprises a secondary synchronization signal;
carrying out transformation processing on the time domain information of the cell to obtain corresponding frequency domain data information;
and performing synchronous tracking by using the auxiliary synchronous signal based on the frequency domain data information.
2. The cell synchronization tracking method according to claim 1, wherein the plurality of cells are intra-frequency cells; the frequency domain data information includes first frequency domain data and second frequency domain data, and the transforming the time domain information of the cell to obtain corresponding frequency domain data information includes:
judging to obtain a reference cell based on the synchronization information of the cell;
performing time-frequency transformation on the time domain information of the reference cell to obtain the first frequency domain data of the reference cell;
and performing time offset compensation on the first frequency domain data of the reference cell to obtain second frequency domain data of a non-reference cell.
3. The cell synchronization tracking method according to claim 2, wherein the performing synchronization tracking by using the secondary synchronization signal based on the frequency domain data information comprises:
and performing synchronous tracking by using an auxiliary synchronous signal based on the first frequency domain data and the second frequency domain data to obtain first synchronous tracking information of the reference cell and second synchronous tracking information of the non-reference cell.
4. The cell synchronization tracking method according to claim 3, wherein after performing the synchronization tracking using the secondary synchronization signal based on the first frequency domain data and the second frequency domain data to obtain the first synchronization tracking information of the reference cell and the second synchronization tracking information of the non-reference cell, the method further comprises:
if the synchronization point of the reference cell changes, updating the synchronization point of the first frequency domain data based on the first synchronization tracking information;
and if the synchronization point of the non-reference cell changes, updating the time offset value of the second frequency domain data based on the second synchronization tracking information.
5. The cell synchronization tracking method according to claim 4, wherein the updating of the synchronization point of the first frequency domain data based on the first synchronization tracking information is performed if the synchronization point of the reference cell changes; if the synchronization point of the non-reference cell changes, after updating the time offset value of the second frequency domain data based on the second synchronization tracking information, the method further includes:
and if the reference cell does not meet the reference condition, updating and replacing the reference cell.
6. The cell synchronization tracking method according to claim 2, wherein the determining to obtain the reference cell based on the plurality of pieces of cell information includes:
screening out a plurality of unsynchronized cells based on a plurality of pieces of synchronization information;
carrying out extension processing on the synchronization points of the plurality of unsynchronized cells to obtain a plurality of synchronization point detection ranges;
if the synchronization point detection range comprises the synchronization point of the cell with the optimal signal quality, taking the corresponding unsynchronized cell as a first candidate cell;
if only one first candidate cell exists, taking the corresponding unsynchronized cell as the reference cell;
wherein other cells within the synchronization point detection range of the reference cell are the non-reference cells.
7. The cell synchronization tracking method according to claim 6, wherein the extending the synchronization points of the unsynchronized cells to obtain a plurality of synchronization point detection ranges comprises:
and taking the synchronization points of the plurality of unsynchronized cells as time starting points, and extending the time range of the length of the cyclic prefix to obtain a plurality of detection ranges of the synchronization points.
8. The method of claim 6, wherein after performing the step of taking the non-synchronized cell as the reference cell if there is only one of the first candidate cells, the method further comprises:
if there are a plurality of first candidate cells, selecting the non-out-of-step cell corresponding to the largest number of cell synchronization points in the synchronization point detection range from the first candidate cells as a second candidate cell;
and if only one second candidate cell exists, taking the corresponding unsynchronized cell as the reference cell.
9. The method of claim 8, wherein after performing the step of taking the non-synchronized cell as the reference cell if there is only one second candidate cell, the method further comprises:
and if the second candidate cells are multiple, taking the non-desynchronized cell with the optimal signal quality from the second candidate cells as the reference cell.
10. The cell synchronization tracking method according to claim 2, wherein the performing time offset compensation on the first frequency domain data of the reference cell to obtain the second frequency domain data of a non-reference cell comprises:
performing difference operation on the synchronization point of the non-reference cell and the synchronization point of the reference cell to obtain a time offset value;
and performing compensation processing on the first frequency domain data based on the time offset value to obtain the second frequency domain data of the non-reference cell.
11. A cell synchronization tracking apparatus, comprising:
the first module is used for acquiring air interface signals based on the target frequency points to obtain time domain information of a plurality of cells;
a second module, configured to analyze the time domain information of the cell to obtain synchronization information of the cell; the synchronization information comprises a secondary synchronization signal;
a third module, configured to perform transform processing on the time domain information of the cell to obtain corresponding frequency domain data information;
and a fourth module, configured to perform synchronization tracking by using the secondary synchronization signal based on the frequency domain data information.
12. The cell synchronization tracking apparatus according to claim 11, wherein the plurality of cells are co-frequency cells; the frequency domain data information comprises first frequency domain data and second frequency domain data, the third module comprises:
a fifth module, configured to determine to obtain a reference cell based on the synchronization information of the cell;
a sixth module, configured to perform time-frequency transformation on the time domain information of the reference cell to obtain the first frequency domain data of the reference cell;
a seventh module, configured to perform time offset compensation on the first frequency domain data of the reference cell to obtain the second frequency domain data of a non-reference cell.
13. The cell synchronization tracking apparatus of claim 11, wherein the fourth module comprises:
an eighth module, configured to perform synchronous tracking by using an auxiliary synchronization signal based on the first frequency domain data and the second frequency domain data, to obtain first synchronous tracking information of the reference cell and second synchronous tracking information of the non-reference cell.
14. An apparatus, comprising: memory, processor and computer program stored on the memory and executable on the processor, characterized in that the processor implements the cell synchronization tracking method according to any of claims 1 to 10 when executing the computer program.
15. A computer-readable storage medium storing computer-executable instructions for performing the cell synchronization tracking method of any one of claims 1 to 10.
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