WO2017028589A1

WO2017028589A1 - Frequency sweeping method, device and terminal, and computer storage medium

Info

Publication number: WO2017028589A1
Application number: PCT/CN2016/083496
Authority: WO
Inventors: 高竹红
Original assignee: 深圳市中兴微电子技术有限公司
Priority date: 2015-08-17
Filing date: 2016-05-26
Publication date: 2017-02-23
Also published as: CN106470462A; CN106470462B

Abstract

Disclosed in an embodiment of the present invention is a frequency sweeping method, comprising: acquiring an initial primary synchronization signal (PSS) peak envelope of a frequency band that requires frequency sweeping; when the initial PSS peak envelope satisfies a set condition, determining a frequency subband a center point of which is a frequency point corresponding to a maximum peak of the initial PSS peak envelope; or, acquiring the i-th PSS peak envelope of the frequency band that requires frequency sweeping, where i is greater than 1, and when the i-th PSS peak envelope of the frequency band that requires frequency sweeping satisfies the set condition, determining a frequency subband a center point of which is a frequency point corresponding to a maximum peak of a current PSS peak envelope; and determining a frequency point of the frequency sweeping result in the frequency subband. Also disclosed in embodiments of the present invention are a frequency sweeping device and terminal, and a computer storage medium.

Description

Frequency sweeping method, device, terminal and computer storage medium

Technical field

The present invention relates to a frequency sweeping technique for a wireless communication system, and more particularly to a frequency sweeping method, apparatus, terminal, and computer storage medium.

Background technique

The Long Term Evolution (LTE) system is a new generation wireless communication system based on Orthogonal Frequency Division Multiplexing (OFDM) technology and Multiple-Input Multiple-Output (MIMO) technology. The LTE-Advance (LTE-A) system is an upgraded version of the LTE system. The LTE/LTE-A system supports a wide range of bandwidths, and its channel grid is 100 kHz. Therefore, there are many frequency points in each working frequency band, and the LTE/LTE-A system frequency sweeping process is user equipment (User Equipment, The UE is carried out without any prior information, and its purpose is to find a suitable frequency point from all these possible frequency points for further processing, such as cell search, camping, and the like.

At present, when the LTE/LTE-A system performs frequency sweeping, the following technical solutions are generally adopted: simultaneously receiving time domain data of multiple frequency points, and then transforming the received time domain data from the time domain to the frequency domain, and synchronizing in the frequency domain. Signal strength within the signal range is measured and frequency domain features are matched to determine possible frequency points. However, the technical solution has the following problem: when there are other UEs in the vicinity of the UE that performs the frequency sweep, and the other UEs have uplink services, the frequency-swept UE may perform frequency sweeping due to interference caused by uplink services of other UEs. The false alarm frequency is generated, which causes the false alarm rate of the LTE/LTE-A system to be swept.

Summary of the invention

In order to solve the above technical problem, an embodiment of the present invention is to provide a frequency sweeping method and apparatus. Terminal and computer storage media.

The technical solution of the embodiment of the present invention is implemented as follows:

The embodiment of the invention provides a frequency sweeping method, including:

Obtain the initial primary synchronization signal (PSS) peak envelope of the frequency band that needs to be swept;

When the initial PSS peak envelope satisfies the set condition, the sub-band is determined, and the center point of the sub-band is a frequency point corresponding to the maximum peak of the initial PSS peak envelope; or, the frequency band that needs to be swept is obtained. The i-th PSS peak envelope, i is greater than 1, when the i-th PSS peak envelope of the frequency band that needs to be swept satisfies the set condition, the sub-band is determined, and the center point of the sub-band is the current PSS peak packet. The frequency corresponding to the maximum peak of the network;

A frequency of the frequency sweep result is determined in the sub-band.

In the above solution, the obtaining an initial PSS peak envelope of a frequency band that needs to be swept, includes:

The PSS frequency is acquired as the step size from the starting frequency point of the frequency band that needs to be swept, and the PSS frequency is obtained as the step size, and the initial PSS peak envelope is obtained.

In the above solution, the first PSS peak envelope of the frequency band that needs to be swept is the initial PSS peak envelope of the frequency band that needs to be swept; and the ith PSS peak packet of the frequency band that needs to be swept is obtained. The network includes:

When the i-1th PSS peak envelope of the frequency band to be swept does not satisfy the set condition, at least the i-th PSS peak envelope of the frequency band to be swept is deleted, and at least the maximum peak value is deleted. a peak that yields the i-th PSS peak envelope of the frequency band that needs to be swept;

Alternatively, when the i-1th PSS peak envelope of the frequency band that needs to be swept meets the set condition, the frequency to be confirmed is obtained in the determined sub-band, and the secondary synchronization signal is performed at the frequency to be confirmed (Secondary) Synchronization Signal (SSS) detects the SSS peak of the frequency to be confirmed; when the SSS peak of the frequency to be confirmed is less than or equal to the set third threshold, In the i-1th PSS peak envelope of the frequency swept frequency band, at least one peak including the maximum peak value is deleted, and the i-th PSS peak envelope of the frequency band that needs to be swept is obtained;

Alternatively, when the i-1th PSS peak envelope of the frequency band that needs to be swept meets the set condition, the frequency of the sweep result determined in the sub-band is stored in the sweep result list, and the frequency sweep result is When the number of frequency points in the list is less than or equal to the set threshold, at least one peak including the maximum peak is deleted in the i-1th PSS peak envelope of the frequency band that needs to be swept, and the frequency band that needs to be swept is obtained. The ith PSS peak envelope.

In the above solution, the determining a frequency of the frequency sweeping result in the sub-band includes:

Obtaining a PSS frequency point from a starting frequency point of the sub-band at a set second frequency interval as a step size, and performing PSS detection to obtain a PSS peak sub-envement corresponding to the sub-band; based on the PSS The peak sub-envelope determines the frequency of the sweep result.

In the above solution, determining the frequency of the frequency sweeping result based on the PSS peak sub-envelope includes: using a frequency point corresponding to a maximum peak value of the PSS peak sub-envelope as a frequency to be confirmed, at a frequency to be confirmed Performing an SSS detection to obtain an SSS peak of the frequency to be confirmed; when the SSS peak of the to-be-identified frequency point is greater than a third threshold, the frequency to be confirmed is determined as a frequency of the frequency sweeping result.

In the above solution, after determining the frequency to be confirmed as the frequency of the frequency sweeping result, the method further includes: storing the frequency of the frequency sweeping result into the frequency sweeping result list;

The frequency points in the sweep result list are sorted according to the size of the SSS peak.

In the above solution, the setting condition is that the ratio of the maximum peak value to the bottom noise of the corresponding PSS peak envelope is greater than the set first threshold.

In the above solution, before determining the sub-band, the method further includes:

Determining whether the maximum peak of the PSS peak envelope is greater than a set second threshold, and if greater than the set second threshold, determining whether a ratio of a maximum peak to a bottom noise of the PSS peak envelope is greater than a set A threshold; otherwise, the frequency sweeping process of the frequency band that currently needs to be swept is ended.

The embodiment of the invention further provides a frequency sweeping device, comprising an acquiring module, a first determining module and a second determining module; wherein

The acquiring module is configured to obtain an initial primary synchronization signal PSS peak envelope of a frequency band that needs to be swept;

The first determining module is configured to determine a sub-band when the initial PSS peak envelope satisfies the set condition, where a center point of the sub-band is a frequency point corresponding to a maximum peak of the initial PSS peak envelope; Or configured to obtain an i-th PSS peak envelope of a frequency band that needs to be swept, i is greater than 1, and when the i-th PSS peak envelope satisfies a set condition, determining a sub-band, a center point of the sub-band The frequency point corresponding to the maximum peak of the current PSS peak envelope;

The second determining module is configured to determine a frequency of the frequency sweeping result in the sub-band.

In the above solution, the acquiring module is configured to obtain a PSS frequency point as a step size from a starting frequency point of a frequency band that needs to be swept, and perform PSS detection to obtain an initial PSS peak value. Envelope.

In the above solution, the first determining module is configured to configure the i-1th of the frequency band that needs to be swept when the i-1th PSS peak envelope of the frequency band that needs to be swept does not satisfy the set condition In the PSS peak envelope, at least one peak including the maximum peak is deleted, and the i-th PSS peak envelope of the frequency band that needs to be swept is obtained;

Alternatively, when the i-1th PSS peak envelope of the frequency band that needs to be swept needs to meet the set condition, the frequency to be confirmed is obtained in the determined sub-band, and the secondary synchronization signal is performed at the frequency to be confirmed. SSS detection, obtaining the SSS peak of the frequency to be confirmed; when the SSS peak of the to-be-identified frequency point is less than or equal to the set third threshold, the i-1th PSS peak packet in the frequency band that needs to be swept In the network, deleting at least one peak including the maximum peak, and obtaining an i-th PSS peak envelope of the frequency band that needs to be swept;

Or configured to: when the i-1th PSS peak envelope of the frequency band that needs to be swept meets the set condition, store the frequency of the sweep result determined in the sub-band into the sweep result list, and scan When the number of frequency points in the frequency result list is less than or equal to the set threshold, at least one peak including the maximum peak is deleted in the i-1th PSS peak envelope of the frequency band that needs to be swept, and the frequency sweep is required. The i-th PSS peak envelope of the band.

In the above solution, the second determining module is configured to obtain a PSS frequency point as a step size from a starting frequency point of the sub-band and set a second frequency interval, and perform PSS detection to obtain the sub- The PSS peak sub-envelope corresponding to the frequency band; determining the frequency of the frequency sweeping result based on the PSS peak sub-envelope.

In the above solution, the second determining module is configured to use a frequency point corresponding to a maximum peak of the PSS peak sub-envelope as a frequency to be confirmed, and perform SSS detection at the frequency to be confirmed, to obtain the to-be-confirmed The SSS peak of the frequency point; when the SSS peak of the frequency to be confirmed is greater than the set third threshold, the frequency to be confirmed is determined as the frequency of the frequency sweeping result.

The embodiment of the invention further provides a terminal, including any one of the above-mentioned frequency sweeping devices.

The embodiment of the present invention further provides a computer storage medium, the computer storage medium comprising a set of instructions, when executed, causing at least one processor to perform the above-described frequency sweeping method.

The frequency sweeping method, device, terminal and computer storage medium provided by the embodiments of the present invention acquire an initial PSS peak envelope of a frequency band that needs to be swept; when the initial PSS peak envelope satisfies a set condition, the sub-band is determined. The center point of the sub-band is the frequency point corresponding to the maximum peak of the initial PSS peak envelope; or, the ith PSS peak envelope of the frequency band that needs to be swept, and the frequency band that needs to be swept When the PSS peak envelopes satisfy the set condition, the sub-band is determined, and the center point of the sub-band is the frequency point corresponding to the maximum peak of the current PSS peak envelope; and the frequency-frequency of the sweep is determined in the sub-band. In this way, the false frequency point can be effectively filtered, the frequency sweep false alarm rate can be reduced, the frequency sweep accuracy rate can be improved, and the uplink interference caused by other UEs can be suppressed.

DRAWINGS

1 is a flow chart of a first embodiment of a frequency sweeping method of the present invention;

2 is a schematic structural diagram of a downlink LTE frame in a first embodiment of a frequency sweeping method according to the present invention;

3 is a flow chart of a second embodiment of a frequency sweeping method of the present invention;

FIG. 4 is a schematic structural diagram of a frequency sweeping device according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings.

In various embodiments of the present invention, an initial primary synchronization signal PSS peak envelope of a frequency band that needs to be frequency-swept is acquired; when the initial PSS peak envelope satisfies a set condition, a sub-band is determined, and a center of the sub-band is determined. Point is the frequency point corresponding to the maximum peak of the initial PSS peak envelope; or, obtain the i-th PSS peak envelope of the frequency band that needs to be swept, i is greater than 1, the i-th of the frequency band that needs to be swept When the PSS peak envelope satisfies the set condition, the sub-band is determined, and the center point of the sub-band is the frequency point corresponding to the maximum peak of the current PSS peak envelope; and the frequency-frequency of the sweep result is determined in the sub-band.

First embodiment

1 is a flow chart of a first embodiment of a frequency sweeping method according to the present invention. As shown in FIG. 1, the method includes:

Step 100: Obtain an initial PSS peak envelope of a frequency band that needs to be swept.

In practical applications, the frequency band that needs to be swept may be one or multiple; for example, the frequency band that needs to be swept may be Band38, Band39, Band40 or Band41. Here, each frequency band that needs to be swept may be a preset frequency band.

The following is a description of the location of the PSS in the LTE frame structure. FIG. 2 is a schematic diagram of the structure of the downlink LTE frame in the first embodiment of the frequency sweeping method of the present invention. As shown in FIG. 2, for Time Division Long Term Evolution (TD-) In the LTE system, each radio frame has a length of 10 ms, and each radio frame is composed of two fields, each of which has a length of 5 ms. Each field consists of five subframes of equal length, each subframe having a length of 1 ms; here, the first of each radio frame The five subframes of the field are marked as S0, S1, S2, S3, and S4, respectively, and the five subframes of the second field of each radio frame are labeled as S5, S6, S7, S8, and S9, respectively. Each field consists of eight regular time slots and three special time slots, respectively DwPTS, GP and UpPTS, each of which has a length of 0.1 ms and a total of three special time slots. The length is 1ms. Each regular time slot/special time slot contains at least one OFDM symbol. In practical applications, the PSS is mapped on the third OFDM symbol of the second subframe of each field, that is, the PSS is mapped in the subframe S1. And on the third OFDM symbol of subframe S6.

As shown in FIG. 2, for a Frequency Division Duplexing LTE (FDD-LTE) system, each radio frame has a length of 10 ms, and each radio frame is composed of ten subframes, and the length of each subframe. It is 1 ms; here, ten subframes of each radio frame are respectively marked as s0, s1, s2, s3, s4, s5, s6, s7, s8, and s9. Each subframe is composed of two slots, each slot having a length of 0.5 ms; each slot contains at least one OFDM symbol, and in practical applications, the PSS is mapped in the first subframe and the first of each radio frame. Five subframes on the OFDM symbol.

In this step, the obtaining an initial PSS peak envelope of a frequency band that needs to be swept, specifically includes: obtaining a PSS frequency from a starting frequency point of a frequency band that needs to be swept by using a set first frequency interval as a step size. Point and perform PSS detection to get the initial PSS peak envelope.

Here, the process of PSS detection is: correlating the signal received at each PSS frequency point acquired with the local PSS sequence to obtain a peak at the corresponding PSS frequency point. There are various existing implementations of the process of correlating the received signal at the PSS frequency with the local PSS sequence, which will not be described in detail herein.

Step 101: When the initial PSS peak envelope satisfies the set condition, determine a sub-band, where a center point is a frequency point corresponding to a maximum peak of the initial PSS peak envelope; or, acquiring needs to perform frequency sweeping The i-th PSS peak envelope of the frequency band, i is greater than 1, when the i-th PSS peak envelope of the frequency band that needs to be swept satisfies the set condition, the sub-band is determined, and the center point of the sub-band is current The frequency point corresponding to the maximum peak of the PSS peak envelope.

Here, the first PSS peak envelope of the frequency band that needs to be swept is the initial PSS peak envelope of the frequency band that needs to be swept.

Specifically, the obtaining the i-th PSS peak envelope of the frequency band that needs to be swept includes:

Alternatively, when the i-1th PSS peak envelope of the frequency band that needs to be swept meets the set condition, the frequency to be confirmed is obtained in the determined sub-band, and the secondary synchronization signal SSS is detected at the frequency to be confirmed. Obtaining an SSS peak of the frequency to be confirmed; when the SSS peak of the to-be-identified frequency point is less than or equal to the set third threshold, in the i-1th PSS peak envelope of the frequency band that needs to be swept , deleting at least one peak including the maximum peak, and obtaining an i-th PSS peak envelope of the frequency band that needs to be swept;

In this step, the setting condition may be that the ratio of the maximum peak value to the bottom noise of the corresponding PSS peak envelope is greater than the set first threshold. That is, when the ratio of the maximum peak to the bottom noise of the initial PSS peak envelope is greater than the set first threshold, the sub-band is determined; or, the ith PSS peak envelope of the frequency band that needs to be swept. The sub-band is determined when the ratio of the maximum peak to the bottom noise is greater than the set first threshold.

In an embodiment, before determining the sub-band, the step may further include: determining whether a maximum peak of the corresponding PSS peak envelope is greater than a set second threshold, and if greater than the set second threshold, determining a corresponding PSS peak Whether the ratio of the maximum peak value of the envelope to the noise floor is greater than the set first gate Limit; otherwise, the frequency sweeping process of the frequency band that needs to be swept is ended, and the frequency band that needs to be swept is swept.

Here, the set second threshold unit is the same as the maximum peak of the corresponding PSS peak envelope, for example, the set second threshold value is 200; the set first threshold is 2.5.

In this step, the maximum peak value of the PSS peak envelope is P(N), where N represents the sequence number of the frequency point corresponding to the maximum peak of the PSS peak envelope, that is, the Nth frequency band in the frequency band that needs to be swept. The peak corresponding to the PSS frequency is the maximum peak of the PSS peak envelope.

In practical applications, let M denote the number of PSS frequencies acquired in the frequency band that needs to be swept, obviously 1≤N≤M; the noise floor is [P(Nm)+P(N+m)]/2, Where m is a natural number. When N is greater than m, P(Nm) represents the peak corresponding to the Nth PSS frequency in the frequency band to be swept. When N is less than or equal to m, P(Nm) indicates that the frequency sweep is required. The peak corresponding to the first PSS frequency in the frequency band; when N is less than or equal to Mm, P(N+m) represents the peak corresponding to the N+m PSS frequency in the frequency band to be swept, when N is greater than Mm When P(N+m) represents the peak corresponding to the Mth PSS frequency point in the frequency band that needs to be swept. An example is given below. In this example, M is 80, N is 20, and m is 2. The number of PSS frequencies acquired in the frequency band that needs to be swept is 80, and the current PSS peak envelope is the largest. The peak value is P(20), and the noise floor is [P(18)+P(22)]/2, where P(18) represents the peak corresponding to the eighteenth PSS frequency point in the frequency band that needs to be swept, P (22) indicates the peak corresponding to the twenty-second PSS frequency point in the frequency band to be swept.

In this step, the frequency range of the sub-band may be a set value. For example, the frequency range of the sub-band is 1 MHz, the interval between the center point of the sub-band and the lowest frequency of the sub-band is 500 kHz, and the center point and the sub-band of the sub-band are the most. The interval between the high frequency points is 500 kHz.

In this step, after determining the sub-band, skip to step 102.

It should be noted that if the ratio of the maximum peak to the bottom noise of the corresponding PSS peak envelope is not greater than the set first threshold, the maximum peak value is deleted in the corresponding PSS peak envelope. Re-execute this step with one less peak. It can be seen that after removing at least one peak in the PSS peak envelope, the PSS peak envelope changes.

Here, each peak of the current PSS peak envelope that needs to be deleted may include a maximum peak P(N) corresponding to the PSS peak envelope, and may also include at least one peak near the maximum peak of the current PSS peak envelope; for example, a corresponding PSS peak At least one peak near the maximum peak of the envelope includes peaks P(Nm) to P(N-1) in the current PSS peak envelope, and peaks P(N+1) to P(N) in the corresponding PSS peak envelope +m).

Step 102: Determine a frequency of the frequency sweeping result in the sub-band.

The step specifically includes: obtaining a PSS frequency point from a starting frequency point of the sub-band with a set second frequency interval as a step size, and performing PSS detection to obtain a PSS peak sub-envelope corresponding to the sub-band. And determining a frequency of the frequency sweeping result based on the PSS peak sub-envelope.

Here, the second frequency interval is smaller than the first frequency interval, for example, the first frequency interval is 500 KHz, and the second frequency interval is 100 KHz.

In an embodiment, the determining a frequency of the frequency sweeping result based on the PSS peak sub-envelope includes: using a frequency point corresponding to a maximum peak value of the PSS peak sub-envelope as a frequency to be confirmed, in a frequency to be confirmed Performing SSS detection at a point to obtain an SSS peak of the frequency to be confirmed; when the SSS peak of the to-be-identified frequency point is greater than a set SSS peak threshold, determining the frequency to be confirmed as a frequency of the frequency sweeping result .

The location of the SSS in the LTE frame structure is described below. As shown in FIG. 2, for the TD-LTE system, the SSS is mapped on the last OFDM symbol of the first subframe of each field, that is, the SSS is mapped in the subframe. S0 and the last OFDM symbol of the subframe S5; for the FDD-LTE system, the SSS is mapped on the OFDM symbols of the first subframe and the fifth subframe of each radio frame.

Here, the process of performing SSS detection at the frequency to be confirmed is: correlating the signal received at the frequency to be confirmed with the local SSS sequence to obtain a peak at the corresponding SSS frequency. The process of correlating the signals received at the frequency to be confirmed with the local SSS sequence has various existing methods. The implementation is not detailed here.

It should be noted that, in this step, if the SSS peak of the to-be-checked frequency point is not greater than the set third threshold, at least one peak is deleted in the corresponding PSS peak envelope, and the process returns to step 101. It can be seen that after removing at least one peak in the PSS peak envelope, the PSS peak envelope changes.

Here, each peak of the corresponding PSS peak envelope that needs to be deleted may include a maximum peak P(N) corresponding to the PSS peak envelope, and may further include at least one peak near the maximum peak of the corresponding PSS peak envelope; for example, corresponding PSS peak At least one peak near the maximum peak of the envelope includes peaks P(Nm) to P(N-1) in the corresponding PSS peak envelope, and peaks P(N+1) to P(N) in the corresponding PSS peak envelope +m).

In actual application, after determining the frequency to be confirmed as the frequency of the frequency sweeping result, the frequency of the frequency sweeping result is stored in the frequency sweeping result list, and it is determined whether the frequency number in the sweeping result list is greater than a set threshold, if If the threshold is greater than the set threshold, the frequency sweeping process of the frequency band that needs to be swept is ended, and the frequency band that needs to be swept is swept; if not greater than the set threshold, at least one of the current PSS peak envelopes is deleted. The peak value is returned to step 101. It can be seen that after removing at least one peak in the PSS peak envelope, the PSS peak envelope changes.

Further, after the frequency to be confirmed is stored in the sweep result list, the frequency points in the sweep result list are sorted according to the size of the SSS peak; here, the SSS peaks may be in descending order. Sort the frequency points in the sweep result list; you can also sort the frequency points in the sweep result list in the order of the SSS peaks from small to large.

Second embodiment

In order to further embodies the object of the present invention, further exemplification will be made on the basis of the first embodiment of the present invention.

In the second embodiment of the present invention, there are three frequency bands that need to be swept. The first frequency band that needs to be swept is Band38, and the corresponding frequency point is 3775MHz to 3824.9MHz. The second frequency band that needs to be swept is Band39, the corresponding frequency is 3825MHz to 3864.9MHz; the third frequency band that needs to be swept is Band40, and the corresponding frequency is 3865MHz to 3964.9MHz.

3 is a flow chart of a second embodiment of a frequency sweeping method according to the present invention. As shown in FIG. 3, the method includes:

Step 301: Select one frequency band among the three frequency bands that need to be swept, and here, select the frequency band Band38.

Step 302: Acquire a PSS frequency point from a starting frequency point of the selected frequency band in a step of 500 KHz, and perform correlation operation between the received signal at each acquired PSS frequency point and a local PSS sequence to obtain a PSS peak envelope.

It can be seen that the number of PSS frequencies obtained in this step is 100, and the acquired PSS frequencies are 3775 MHz, 3775.5 MHz, 3776 MHz, ..., 3824.5 MHz, respectively.

Step 303: Determine whether the maximum peak value in the current PSS peak envelope is greater than the set second threshold. If it is greater than the set second threshold, skip to step 304; if not greater than the set second threshold, end the current The frequency sweeping process of the frequency band that needs to be swept is performed for the next frequency band that needs to be swept, that is, the frequency band Band39 is swept.

For example, in the current PSS peak envelope, the maximum peak value is 1000, and the maximum peak value in the current PSS peak envelope corresponds to a frequency of 3805 MHz, and the set second threshold is 100.

Step 304: Calculate a ratio of a maximum peak value to a bottom noise of the current PSS peak envelope.

For example, the maximum peak value of the current PSS peak envelope is P(N), where N represents the current PSS The sequence number of the peak corresponding to the maximum peak of the peak envelope. The maximum peak value in the current PSS peak envelope corresponds to a frequency of 3805 MHz, indicating that N is 61.

The noise floor is [P(Nm)+P(N+m)]/2, where m=2, and P(61)=1000, P(61-2)=200, P(61+2)=180 Therefore, the noise floor value is 190. At this time, the ratio of the maximum peak to the bottom noise of the current PSS peak envelope is 2*1000/(200+180).

Step 305: Determine whether the ratio of the maximum peak value of the current PSS peak envelope to the bottom noise is greater than the set first threshold. If it is greater than the set first threshold, skip to step 306, if not greater than the set first threshold. Then, at least one peak including the largest peak is deleted in the current PSS peak envelope, and the process returns to step 303.

For example, if the first threshold is set to 2.8, and the ratio of the maximum peak to the bottom noise of the current PSS peak envelope is less than or equal to the set first threshold, the peak P(N-2), P in the current PSS peak envelope will be (N-1), P(N), P(N+1), and P(N+2) are cleared.

Step 306: Determine a sub-band, where a center point is a frequency point corresponding to a maximum peak of a current PSS peak envelope, and obtain a frequency to be confirmed in the determined sub-band.

Specifically, the PSS frequency point is obtained by using the 100KHz as the step size from the starting frequency of the sub-band, and the PSS detection is performed, and the PSS peak sub-envement corresponding to the determined sub-band is obtained; the PSS peak sub-packet is obtained. The frequency point corresponding to the maximum peak of the network is taken as the frequency to be confirmed.

For example, the sub-band determined in this step is 3804.5 MHz to 3805.5 MHz. At this time, the number of PSS frequencies acquired in the determined sub-band is 11; the frequency to be confirmed obtained in this step is 3805.2 MHz.

Step 307: Perform SSS detection at the frequency to be confirmed, and obtain an SSS peak of the frequency to be confirmed.

For example, the frequency to be confirmed is 3805.2 MHz, and the peak value of the SSS to be confirmed is 3000.

Step 308: Determine whether the SSS peak of the frequency to be confirmed is greater than the set third threshold. If it is greater than the set third threshold, skip to step 309; if not greater than the set third threshold, then At least one peak including the largest peak is deleted in the current PSS peak envelope, and the process returns to step 303.

For example, if the third threshold is set to 1000, and the SSS peak of the to-be-identified frequency point is less than or equal to the set third threshold, the peak P(N-2), P(N-1) in the current PSS peak envelope, P(N), P(N+1), and P(N+2) are cleared, and then returns to step 303.

Step 309: The frequency to be confirmed is stored in the sweep result list, and the frequency points in the sweep result list are sorted according to the size of the SSS peak.

Step 310: Determine whether the number of frequency points in the sweeping result list is greater than a set threshold. If it is greater than the set threshold, end the frequency sweeping process of the frequency band that needs to be swept, and perform frequency sweeping on the next frequency band that needs to be swept. If it is not greater than the set threshold, at least one peak of the current PSS peak envelope is deleted in the current PSS peak envelope, and the process returns to step 303.

For example, the threshold is set to 4. At this time, there are at most 4 frequency points in the list of sweep results corresponding to each frequency band that needs to be swept.

The frequency sweeping method of the embodiment of the present invention determines the sub-band only when the ratio of the maximum peak value to the bottom noise of the current PSS peak envelope is greater than the set first threshold, which can effectively filter the false frequency point and reduce the frequency sweep false alarm. Rate, improve the frequency sweep accuracy, and suppress the uplink interference caused by other UEs. The frequency sweeping method of the embodiment of the present invention can also implement sorting of each frequency point in the sweeping result list.

In addition, in the case that the LTE/LTE-A system and the Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) system share the band Band 39, the frequency sweeping method of the embodiment of the present invention may pass The PSS and SSS in the LTE/LTE-A system can obtain the frequency of the frequency sweeping result, which can effectively filter the signal generated by the TD-SCDMA system in the band Band39.

Third embodiment

4 is a schematic structural diagram of a frequency sweeping apparatus according to an embodiment of the present invention. As shown in FIG. 4, the apparatus includes an obtaining module 400, a first determining module 401, and a second determining module 402.

The obtaining module 400 is configured to obtain an initial PSS peak envelope of a frequency band that needs to be swept;

The first determining module 401 is configured to determine a sub-band when the initial PSS peak envelope satisfies the set condition, where a center point of the sub-band is a frequency point corresponding to a maximum peak of the initial PSS peak envelope Or, configured to obtain an i-th PSS peak envelope of a frequency band that needs to be swept, i is greater than 1, and when the i-th PSS peak envelope satisfies a set condition, determining a sub-band, the center of the sub-band The point is the frequency point corresponding to the maximum peak of the current PSS peak envelope.

The second determining module 402 is configured to determine a frequency of the frequency sweeping result in the sub-band.

Specifically, the acquiring module 400 is configured to obtain a PSS frequency point as a step size from a starting frequency point of a frequency band that needs to be swept, and perform PSS detection to obtain an initial PSS peak value. Envelope.

The first determining module 401 is configured to: when the i-1th PSS peak envelope of the frequency band that needs to be swept does not satisfy the set condition, the i-1th PSS peak packet in the frequency band that needs to be swept In the network, deleting at least one peak including the maximum peak, and obtaining an i-th PSS peak envelope of the frequency band that needs to be swept;

Or configured to: when the i-1th PSS peak envelope of the frequency band that needs to be swept meets the set condition, store the frequency of the sweep result determined in the sub-band into the sweep result list, and scan When the number of frequency points in the frequency result list is less than or equal to the set threshold value, at least one peak including the maximum peak value is deleted in the i-1th PSS peak envelope of the frequency band that needs to be swept, and the required value is obtained. The i-th PSS peak envelope of the frequency band in which the frequency sweep is performed.

The second determining module 402 is configured to obtain a PSS frequency point as a step size from a starting frequency point of the sub-band and set a second frequency interval, and perform PSS detection to obtain a corresponding sub-band. PSS peak sub-envelope; determining the frequency of the frequency sweeping result based on the PSS peak sub-envelope.

The second determining module 402 is configured to use a frequency point corresponding to a maximum peak of the PSS peak sub-envelope as a frequency to be confirmed, perform SSS detection at the frequency to be confirmed, and obtain the frequency to be confirmed. SSS peak value; when the SSS peak value of the to-be-identified frequency point is greater than the set third threshold, the frequency to-be-confirmed is determined as the frequency of the frequency-sweeping result.

In an actual application, the obtaining module 400, the first determining module 401, and the second determining module 402 may each be a Central Processing Unit (CPU) or a Micro Processor Unit (MPU) located in the terminal device. , Digital Signal Processor (DSP), or Field Programmable Gate Array (FPGA) implementation.

Fourth embodiment

The embodiment of the invention further provides a terminal, which comprises any one of the frequency sweeping devices of the third embodiment of the invention.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a general purpose computer, a special purpose computer, An processor of an embedded processor or other programmable data processing device to generate a machine such that instructions executed by a processor of a computer or other programmable data processing device are generated for implementation in a flow or a flow of flowcharts and/or Or a block diagram of a device in a box or a function specified in a plurality of boxes.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Based on this, an embodiment of the present invention further provides a computer storage medium, the computer storage medium comprising a set of instructions, when executed, causing at least one processor to execute the frequency sweeping method.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Industrial applicability

The solution provided by the embodiment of the present invention obtains an initial PSS peak envelope of a frequency band that needs to be swept; when the initial PSS peak envelope satisfies a set condition, determining a sub-band, where a center point of the sub-band is the initial The frequency corresponding to the maximum peak of the PSS peak envelope; or, the ith PSS peak envelope of the frequency band that needs to be swept, and the ith PSS peak envelope of the frequency band that needs to be swept satisfies the set condition Determining a sub-band whose center point is a frequency point corresponding to a maximum peak of a current PSS peak envelope; determining a frequency of the frequency sweep in the sub-band point. In this way, the false frequency point can be effectively filtered, the frequency sweep false alarm rate can be reduced, the frequency sweep accuracy rate can be improved, and the uplink interference caused by other UEs can be suppressed.

Claims

A frequency sweeping method, the method comprising:

Obtaining the initial primary synchronization signal PSS peak envelope of the frequency band that needs to be swept;

When the initial PSS peak envelope satisfies the set condition, the sub-band is determined, and the center point of the sub-band is a frequency point corresponding to the maximum peak of the initial PSS peak envelope; or, the frequency band that needs to be swept is obtained. The i-th PSS peak envelope, i is greater than 1, when the i-th PSS peak envelope of the frequency band that needs to be swept satisfies the set condition, the sub-band is determined, and the center point of the sub-band is the current PSS peak packet. The frequency corresponding to the maximum peak of the network;

A frequency of the frequency sweep result is determined in the sub-band.
The method of claim 1, wherein the obtaining an initial PSS peak envelope of a frequency band that needs to be swept, comprising:

The PSS frequency is acquired as the step size from the starting frequency point of the frequency band that needs to be swept, and the PSS frequency is obtained as the step size, and the initial PSS peak envelope is obtained.
The method according to claim 1, wherein the first PSS peak envelope of the frequency band that needs to be swept is an initial PSS peak envelope of a frequency band that needs to be swept; and the frequency band that needs to be swept is acquired. The ith PSS peak envelope includes:

When the i-1th PSS peak envelope of the frequency band to be swept does not satisfy the set condition, at least the i-th PSS peak envelope of the frequency band to be swept is deleted, and at least the maximum peak value is deleted. a peak that yields the i-th PSS peak envelope of the frequency band that needs to be swept;

Alternatively, when the i-1th PSS peak envelope of the frequency band that needs to be swept meets the set condition, the frequency to be confirmed is obtained in the determined sub-band, and the secondary synchronization signal SSS is detected at the frequency to be confirmed. Obtaining an SSS peak of the frequency to be confirmed; when the SSS peak of the to-be-identified frequency point is less than or equal to the set third threshold, in the i-1th PSS peak envelope of the frequency band that needs to be swept , deleting at least one peak including the maximum peak, and obtaining an i-th PSS peak envelope of the frequency band that needs to be swept;

Alternatively, when the i-1th PSS peak envelope of the frequency band that needs to be swept meets the set condition, the frequency of the sweep result determined in the sub-band is stored in the sweep result list, and the frequency sweep result is When the number of frequency points in the list is less than or equal to the set threshold, at least one peak including the maximum peak is deleted in the i-1th PSS peak envelope of the frequency band that needs to be swept, and the frequency band that needs to be swept is obtained. The ith PSS peak envelope.
The method of claim 1, wherein said determining a frequency of the frequency sweeping result in said sub-band comprises:

Obtaining a PSS frequency point from a starting frequency point of the sub-band at a set second frequency interval as a step size, and performing PSS detection to obtain a PSS peak sub-envement corresponding to the sub-band; based on the PSS The peak sub-envelope determines the frequency of the sweep result.
The method of claim 4, wherein said determining a frequency of the frequency sweeping result based on said PSS peak sub-envelope comprises:

Taking the frequency point corresponding to the maximum peak of the PSS peak sub-envelope as the frequency to be confirmed, performing SSS detection at the frequency to be confirmed, and obtaining the SSS peak of the to-be-identified frequency point; When the SSS peak value is greater than the set third threshold, the frequency to be confirmed is determined as the frequency of the frequency sweeping result.
The method according to claim 5, wherein after determining the frequency to be confirmed as the frequency of the frequency sweeping result, the method further comprises: storing the frequency of the frequency sweeping result in the frequency sweeping result list;

The frequency points in the sweep result list are sorted according to the size of the SSS peak.
The method according to any one of claims 1 to 6, wherein the setting condition is that a ratio of a maximum peak to a bottom noise of a corresponding PSS peak envelope is greater than a set first threshold.
The method according to any one of claims 1 to 6, wherein before determining the sub-band, the method further comprises:

Determining whether a maximum peak of the PSS peak envelope is greater than a set second threshold, and if greater than a set second threshold, determining a ratio of a maximum peak to a bottom noise of the PSS peak envelope is No greater than the set first threshold; otherwise, the frequency sweeping process of the frequency band that needs to be swept is ended.
A frequency sweeping device, the device comprising an acquisition module, a first determining module and a second determining module; wherein

The acquiring module is configured to obtain an initial primary synchronization signal PSS peak envelope of a frequency band that needs to be swept;

The first determining module is configured to determine a sub-band when the initial PSS peak envelope satisfies the set condition, where a center point of the sub-band is a frequency point corresponding to a maximum peak of the initial PSS peak envelope; Or configured to obtain an i-th PSS peak envelope of a frequency band that needs to be swept, i is greater than 1, and when the i-th PSS peak envelope satisfies a set condition, determining a sub-band, a center point of the sub-band The frequency point corresponding to the maximum peak of the current PSS peak envelope;

The second determining module is configured to determine a frequency of the frequency sweeping result in the sub-band.
The apparatus according to claim 9, wherein the obtaining module is configured to acquire a PSS frequency point as a step size from a starting frequency point of a frequency band that needs to be swept, and perform PSS. Detection, the initial PSS peak envelope is obtained.
The apparatus according to claim 9, wherein the first determining module is configured to perform a frequency sweep when the i-th PSS peak envelope of the frequency band that needs to be swept does not satisfy the set condition In the i-1th PSS peak envelope of the frequency band, at least one peak including the maximum peak is deleted, and the i-th PSS peak envelope of the frequency band that needs to be swept is obtained;

Alternatively, when the i-1th PSS peak envelope of the frequency band that needs to be swept needs to meet the set condition, the frequency to be confirmed is obtained in the determined sub-band, and the secondary synchronization signal is performed at the frequency to be confirmed. SSS detection, obtaining the SSS peak of the frequency to be confirmed; when the SSS peak of the to-be-identified frequency point is less than or equal to the set third threshold, the i-1th PSS peak packet in the frequency band that needs to be swept In the network, deleting at least one peak including the maximum peak, and obtaining an i-th PSS peak envelope of the frequency band that needs to be swept;

Or, configured to meet the setting of the i-1th PSS peak envelope in the frequency band that needs to be swept. When the condition is met, the frequency of the frequency sweeping result determined in the sub-band is stored in the sweeping result list. When the number of frequency points in the sweeping result list is less than or equal to the set threshold, the i-th of the frequency band that needs to be swept is - In a PSS peak envelope, at least one peak including the largest peak is deleted, and the i-th PSS peak envelope of the frequency band to be swept is obtained.
The apparatus according to claim 9, wherein the second determining module is configured to acquire a PSS frequency point as a step size from a starting frequency point of the sub-band and set a second frequency interval, and perform PSS Detecting, obtaining a PSS peak sub-envelope corresponding to the sub-band; determining a frequency of the frequency-sweeping result based on the PSS peak sub-envelope.
The apparatus according to claim 12, wherein the second determining module is configured to use a frequency point corresponding to a maximum peak value of the PSS peak sub-envelope as a frequency to be confirmed, and perform SSS detection at a frequency to be confirmed. And obtaining an SSS peak of the frequency to be confirmed; when the SSS peak of the to-be-identified frequency point is greater than a third threshold, the frequency to be confirmed is determined as a frequency of the frequency sweeping result.
A terminal comprising the frequency sweeping device according to any one of claims 9 to 13.
A computer storage medium comprising a set of instructions that, when executed, cause at least one processor to perform the frequency sweeping method of any one of claims 1-8.