Method for extracting 5g-nr based downlink envelope data and terminal

Abstract

The application provides a 5G-NR-based extraction method and terminal for downlink envelope data. The extraction method comprises the following steps: receiving sampling frequency data under a certain subcarrier spacing; for each wireless frame data in the subcarrier, searching for the frame header position of each wireless frame data; according to the searched frame header position, performing noise removal processing on the frame data after the frame header position in each wireless frame data; performing binary conversion on the frame data after the noise removal; performing fractional decimation sampling processing on at least three binary-converted wireless frame data; when the results of the fractional decimation sampling processing in the at least three wireless frame data are consistent, the result after the fractional decimation sampling processing is the downlink envelope data. The application can receive the subcarrier sent based on the 5G-NR protocol, process the subcarrier according to the frame structure characteristics of the subcarrier, obtain the downlink envelope data in the subcarrier, and further facilitate the switching control of the terminal device.

Description

Technical Field

[0001] This invention relates to the field of 5G communication technology, and in particular to a method and terminal for extracting downlink envelope data based on 5G-NR. Background Technology

[0002] 5G-NR is a global 5G standard based on a new OFDM air interface design and is a very important foundation for the next generation of cellular mobile technology. In the practical application of 5G-NR technology, base stations need to be built within a certain area, and these base stations can then communicate with repeaters.

[0003] A repeater is a wireless signal relay product that consists of components or modules such as an antenna, RF duplexer, low-noise amplifier, mixer, electrically adjustable attenuator, filter, and power amplifier, and includes both uplink and downlink amplification links.

[0004] When a repeater operates in TDD mode, it needs to obtain the uplink / downlink configuration information of the base station. This is to enable downlink amplification during downlink transmission and uplink amplification during uplink reception. The repeater can obtain the uplink / downlink configuration information of the base station by receiving the downlink signal from the base station and extracting its envelope data, thus determining the corresponding power amplifier switching action. Therefore, it is necessary to propose further solutions for obtaining the downlink envelope data from the subcarriers. Summary of the Invention

[0005] The present invention aims to provide a method and terminal for extracting downlink envelope data based on 5G-NR, so as to overcome the shortcomings of the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0007] A method for extracting downlink envelope data based on 5G-NR, comprising the following steps:

[0008] Receive sampling frequency data at a certain subcarrier interval;

[0009] For each radio frame data in the subcarrier, the frame header position of each radio frame data is found according to the SSB search procedure.

[0010] Based on the found frame header position, the frame data after the frame header position in each wireless frame data is processed to remove noise data in the frame data after the frame header position.

[0011] The frame data after noise removal is converted into binary;

[0012] Perform fractional downsampling on at least three wireless frame data after binary conversion;

[0013] If the fractional downsampling results are consistent in at least three wireless frame data, then the result after fractional downsampling is the downlink envelope data.

[0014] As an improvement to the downlink envelope data extraction method based on 5G-NR of the present invention, the frame data after the frame header position in each radio frame data is processed to remove noise data in the frame data after the frame header position, including:

[0015] Perform 2... 14 Filter and extract by a factor of 2; then perform 2... 14 The data extracted by the double filter is then processed to remove the DC component.

[0016] As an improvement to the downlink envelope data extraction method based on 5G-NR of this invention, when the subcarrier spacing is 30kHz and the data sampling frequency is 122.88MSPS, by executing 2 14 After multiple filtering and extraction, 64KSPS of data was obtained.

[0017] As an improvement to the downlink envelope data extraction method based on 5G-NR of the present invention, the step of converting the frame data after removing noise data into binary data includes:

[0018] The sign bit is extracted from the frame data after noise removal, and then the extracted sign bit is inverted to obtain a binary data stream.

[0019] As an improvement to the downlink envelope data extraction method based on 5G-NR of the present invention, fractional downsampling processing is performed on any radio frame data, including:

[0020] The symbol information of the data contained in each time slot of any radio frame data is converted.

[0021] As an improvement to the downlink envelope data extraction method based on 5G-NR of the present invention, the symbol information conversion includes:

[0022] The middle bit data of each symbol in the data contained in the time slot is found, and the middle bit data of each symbol is mapped to the target interval to obtain the symbol information conversion data.

[0023] As an improvement to the downlink envelope data extraction method based on 5G-NR of this invention, the middle bit data of each symbol is mapped to the target interval in the following manner:

[0024] Symbolic information conversion data = {(middle bit data 1 / total data length) * target interval length, (middle bit data 2 / total data length) * target interval length, ..., (middle bit data n / total data length) * target interval length}.

[0025] As an improvement to the 5G-NR-based downlink envelope data extraction method of the present invention, the obtained symbol information conversion data is rounded to obtain integer downlink envelope data located in the target interval.

[0026] As an improvement to the 5G-NR-based downlink envelope data extraction method of the present invention, the obtained symbol information conversion data is rounded, and then the rounded data is added with the corresponding offset to obtain the integer downlink envelope data located in the target interval.

[0027] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0028] A terminal includes: a receiver and a processor;

[0029] The receiver is used to: receive sampling frequency data at a certain subcarrier interval;

[0030] The processor is used to: locate the frame header position of each radio frame data in the subcarrier according to the SSB search procedure;

[0031] Based on the found frame header position, the frame data after the frame header position in each wireless frame data is processed to remove noise data in the frame data after the frame header position.

[0032] The frame data after noise removal is converted into binary;

[0033] Perform fractional downsampling on at least three wireless frame data after binary conversion;

[0034] The results of fractional downsampling in at least three radio frame data are compared. When the results of fractional downsampling in at least three radio frame data are consistent, the output result after fractional downsampling is the downlink envelope data.

[0035] Compared with the prior art, the beneficial effects of the present invention are: the extraction method of the present invention can receive subcarriers transmitted based on the 5G-NR protocol, and perform noise reduction, binary conversion and fractional downsampling processing on the subcarriers according to the frame structure characteristics of the subcarriers to obtain the downlink envelope data in the subcarriers, which is conducive to realizing the switching control of terminal devices based on the downlink envelope data. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic flowchart of an embodiment of the method for extracting downlink envelope data based on 5G-NR according to the present invention;

[0038] Figure 2 This is a schematic diagram of the frame structure of a wireless frame in one embodiment of the 5G-NR-based downlink envelope data extraction method of the present invention;

[0039] Figure 3 This is a module diagram of one embodiment of the terminal of the present invention. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] like Figure 1 As shown, an embodiment of the present invention provides a method for extracting downlink envelope data based on 5G-NR, which includes the following steps:

[0042] S1. Receive sampling frequency data at a certain subcarrier interval.

[0043] According to the 5G-NR protocol, the subcarrier used to transmit information has the following frame structure: a subcarrier has multiple radio frames, each radio frame has 10 subframes, and each subframe contains at least one time slot.

[0044] like Figure 2 As shown, depending on the subcarrier spacing, a subframe can contain one time slot (corresponding to a subcarrier spacing of 15 kHz), two time slots (corresponding to a subcarrier spacing of 30 kHz), four time slots (corresponding to a subcarrier spacing of 60 kHz), or eight time slots (corresponding to a subcarrier spacing of 120 kHz). Furthermore, for each of the above different subcarrier spacings, each included time slot has 14 symbols.

[0045] Therefore, sampling frequency data with corresponding subcarrier intervals can be received according to actual communication needs. In one embodiment, subcarrier data transmitted by the base station with a subcarrier interval of 30kHz and a sampling frequency of 122.88MSPS can be received.

[0046] S2. For each radio frame data in the subcarrier, find the frame header position of each radio frame data according to the SSB search procedure.

[0047] To extract downlink envelope data from subcarriers, the corresponding header positions need to be located first. In step S2, the frame header positions of each radio frame can be located following the SSB search procedure. First, PSS coarse synchronization is performed using sliding correlation (a common processing method in SSB search technology) to obtain the cell group ID and coarse synchronization point; then, fine synchronization is performed using correlation detection methods to obtain the precise fine synchronization point. Based on the obtained fine synchronization point, the corresponding frame header positions can be obtained. Since SSB search is an existing technology, it will not be described in detail here.

[0048] S3. Based on the found frame header position, process the frame data after the frame header position in each wireless frame data to remove noise data in the frame data after the frame header position.

[0049] Since the wireless frame data also contains high-frequency signals and DC components, these can interfere with the extraction of downlink envelope data. Therefore, step S3 can remove the noise data.

[0050] Specifically, firstly, the frame data after the frame header position in each wireless frame data is processed using 2... 14 This involves a 2x filtering extraction, which removes high-frequency data from the radio frame data. In one implementation, when the subcarrier spacing is 30 kHz and the data sampling frequency is 122.88 MSPS, by performing a 2x filtering extraction... 14 After decimation by multiple filtering, 64KSPS of data can be obtained. Furthermore, to achieve frame data filtering and decimation, a CIC filter or a cascaded series of multi-stage half-band filters can be used to filter high-frequency data. Since CIC filters or multi-stage half-band filters are existing filters, they will not be described in detail in this embodiment.

[0051] Furthermore, after removing the high-frequency signal, the data undergoes DC component removal. This removal is achieved through the following steps: The DC component data is obtained by averaging a frame of data. Then, a subtractor is used to subtract the DC component data from the original data, thus removing the DC component.

[0052] S4. Convert the frame data after removing noise into binary format.

[0053] To facilitate subsequent data processing, the frame data after noise removal needs to be converted to binary. Specifically, step S4 includes: extracting the sign bit from the frame data after noise removal, and then inverting the extracted sign bit. At this point, 1 indicates a signed transmission, and 0 indicates an unsigned transmission, resulting in a binary data stream.

[0054] The frame data after noise removal has a sign bit, with the highest bit being the sign bit. Obtaining the sign bit allows the data to be converted from multi-bit to single-bit data, facilitating subsequent binary conversion. Therefore, the sign bit can be obtained by extracting the highest bit from the frame data after noise removal. Then, the extracted sign bit is inverted, replacing 1s with 0s and 0s with 1s, thus obtaining the corresponding binary data stream.

[0055] S5. Perform fractional downsampling on at least three wireless frame data after binary conversion.

[0056] Since the actual envelope indication information data is less than the sampling frequency of the binary converted data (because of the Nyquist sampling theorem, the sampling frequency must be at least twice the data rate), it is necessary to perform fractional downsampling on the oversampled data.

[0057] Specifically, the fractional downsampling process is explained below using a single radio frame as an example. Fractional downsampling for any radio frame includes converting the symbol information of the data contained in each time slot of the radio frame. In one implementation, according to the 5G-NR protocol, when the subcarrier spacing is 30kHz, any radio frame contains 20 time slots, and each time slot contains 32 data points, corresponding to 14 symbols. Therefore, any radio frame contains 640 data points, with a total data length of 15360.

[0058] Furthermore, during fractional downsampling, symbol information conversion needs to be performed on the aforementioned 20 groups of 32 data points. This symbol information conversion includes the following steps: finding the median bit of each symbol in the time slot data, mapping the median bit of each symbol to the target interval, and obtaining the symbol information converted data. In this embodiment, the corresponding target interval is (0~32).

[0059] At this point, the middle bit data of each symbol is mapped to the target interval in the following way:

[0060] The symbol information conversion data = {(middle data 1 / total data length) * target interval length, (middle data 2 / total data length) * target interval length, ..., (middle data n / total data length) * target interval length}. For the 14 symbols corresponding to 20 groups of 32 data points, the starting point, length, and center position of the data are as follows:

[0061] Starting point: 0 1104 2200 3296 4392 5488 6584 7680 8784 9880 109761207213168 14264;

[0062] Length: 1104 1096 1096 1096 1096 1096 1104 1096 1096 1096 109610961096;

[0063] Center location: 552 1652 2748 3844 4940 6036 7132 8232 9332 10428 115241262013716 14812.

[0064] Thus, its center point position, when converted to the interval (0-32), corresponds to:

[0065] 1.1500, 3.4417, 5.7250, 8.0083, 10.2917, 12.5750, 14.8583, 17.1500, 19.4417, 21.7250, 24.0083, 26.2917, 28.5750, 30.8583.

[0066] Furthermore, the symbolic information converted to the (0-32) interval is rounded to obtain the integer downlink envelope data located in the target interval. This rounding is necessary because data indexing requires integer representation. Therefore, rounding is essential.

[0067] 1, 3, 6, 8, 10, 13, 15, 17, 19, 22, 24, 26, 29, 31.

[0068] Furthermore, for different offsets, another set of equivalent integer downlink envelope data can be obtained. In this case, the obtained symbol information conversion data is rounded, and then the corresponding offset is added to the rounded data to obtain the integer downlink envelope data located in the target interval.

[0069] For the target range of (0–32), the aforementioned offset is 1. In this case, the other equivalent set of integer downlink envelope data is:

[0070] 2, 4, 7, 9, 11, 14, 16, 18, 20, 23, 25, 27, 30, 32.

[0071] The reason for setting the two value selection methods based on different offsets is that, when selecting 14 results from 32 numbers, it's approximately one out of 2 to 3 numbers. The selection can start from either the first or the second number, both of which are reasonable. Therefore, configuring the offset to 0 or 1 can achieve the desired result.

[0072] S6. When the results of fractional downsampling are consistent in at least three radio frame data, the result after fractional downsampling is the downlink envelope data.

[0073] The purpose of step S6 is to ensure the accuracy of the results. If the results of fractional downsampling processing in at least three wireless frame data are consistent, the obtained downlink envelope data is considered accurate. Furthermore, consistency refers to consistency within the allowable error range. At this point, based on the extracted downlink envelope data, the switching control of the terminal communicating with the base station can be implemented. In one embodiment, the terminal can be a repeater, etc.

[0074] Based on the same technical concept, another embodiment of the present invention also provides a terminal.

[0075] like Figure 3 As shown, the terminal 100 in this embodiment includes a receiver 10 and a processor 20.

[0076] The receiver 10 is used to receive sampling frequency data at a certain subcarrier interval.

[0077] The processor 20 is used to: locate the frame header position of each radio frame data in the subcarrier according to the SSB search procedure;

[0078] Based on the found frame header position, the frame data after the frame header position in each wireless frame data is processed to remove noise data in the frame data after the frame header position.

[0079] The frame data after noise removal is converted into binary;

[0080] Perform fractional downsampling on at least three wireless frame data after binary conversion;

[0081] The results of fractional downsampling in at least three radio frames are compared. When the results of fractional downsampling in at least three radio frames are consistent, the output result after fractional downsampling is the downlink envelope data.

[0082] In one embodiment, the terminal 100 of this embodiment may be a repeater or the like.

[0083] In summary, the extraction method of the present invention can receive subcarriers transmitted based on the 5G-NR protocol, and perform denoising, binary conversion and fractional downsampling processing on the subcarriers according to the frame structure characteristics of the subcarriers to obtain the downlink envelope data in the subcarriers, which is beneficial for realizing the switching control of terminal devices based on the downlink envelope data.

[0084] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0085] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for extracting downlink envelope data based on 5G-NR, characterized in that, The extraction method includes the following steps: Receive sampling frequency data at a certain subcarrier interval; For each radio frame data in the subcarrier, the frame header position of each radio frame data is found according to the SSB search procedure. Based on the found frame header position, the frame data after the frame header position in each wireless frame data is processed to remove noise data in the frame data after the frame header position. The frame data after noise removal is converted into binary; Perform fractional downsampling on at least three wireless frame data after binary conversion; If the fractional downsampling results are consistent in at least three wireless frame data, then the result after fractional downsampling is the downlink envelope data.

2. The method for extracting downlink envelope data based on 5G-NR according to claim 1, characterized in that, Processing the frame data after the frame header position in each wireless frame data to remove noise data in the frame data after the frame header position includes: Perform 2... 14 Filter and extract by a factor of 2; then perform 2... 14 The data extracted by the double filter is then processed to remove the DC component.

3. The method for extracting downlink envelope data based on 5G-NR according to claim 2, characterized in that, When the subcarrier spacing is 30kHz and the data sampling frequency is 122.88MSPS, by executing 2 14 After multiple filtering and extraction, 64KSPS of data was obtained.

4. The method for extracting downlink envelope data based on 5G-NR according to claim 1, characterized in that, The step of converting the noise-removed frame data into binary includes: The sign bit is extracted from the frame data after noise removal, and then the extracted sign bit is inverted to obtain a binary data stream.

5. The method for extracting downlink envelope data based on 5G-NR according to claim 1, characterized in that, Fractional downsampling of any wireless frame data includes: The symbol information of the data contained in each time slot of any radio frame data is converted.

6. The method for extracting downlink envelope data based on 5G-NR according to claim 5, characterized in that, The symbol information conversion includes: The middle bit data of each symbol in the data contained in the time slot is found, and the middle bit data of each symbol is mapped to the target interval to obtain the symbol information conversion data.

7. The method for extracting downlink envelope data based on 5G-NR according to claim 6, characterized in that, The middle bit data of each symbol is mapped to the target interval in the following way: Symbolic information conversion data = {(intermediate data 1 / total data length) * target interval length, (intermediate data 2 / total data length) * target interval length, ..., (intermediate data n / total data length) * target interval length}.

8. The method for extracting downlink envelope data based on 5G-NR according to claim 6 or 7, characterized in that, The obtained symbol information is converted into data and rounded to obtain integer downlink envelope data located in the target interval.

9. The method for extracting downlink envelope data based on 5G-NR according to claim 8, characterized in that, The obtained symbol information is converted into data and rounded. Then, the corresponding offset is added to the rounded data to obtain the integer downlink envelope data located in the target interval.

10. A terminal, characterized in that, The terminal includes: a receiver and a processor; The receiver is used to: receive sampling frequency data at a certain subcarrier interval; The processor is used to: locate the frame header position of each radio frame data in the subcarrier according to the SSB search procedure; Based on the found frame header position, the frame data after the frame header position in each wireless frame data is processed to remove noise data in the frame data after the frame header position. The frame data after noise removal is converted into binary; Perform fractional downsampling on at least three wireless frame data after binary conversion; The results of fractional downsampling in at least three radio frames are compared. When the results of fractional downsampling in at least three radio frames are consistent, the output result after fractional downsampling is the downlink envelope data.

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