CN111935051B

CN111935051B - Method, device, terminal and storage medium for detecting sequence number of synchronous signal block

Info

Publication number: CN111935051B
Application number: CN202010687813.8A
Authority: CN
Inventors: 刘君
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2023-07-18
Anticipated expiration: 2040-07-16
Also published as: CN111935051A

Abstract

The embodiment of the application provides a method, a device, a terminal and a storage medium for detecting sequence numbers of synchronous signal blocks, and relates to the technical field of communication. The method comprises the following steps: determining a target diameter based on a first PDP, wherein the first PDP is a PDP corresponding to the SS in the target SSB; determining energy values corresponding to the target diameters on the n secondary PDPs respectively to obtain n energy values; wherein, the second PDP with the sequence number i in the n second PDPs is a PDP corresponding to the DMRS obtained based on the sequence number i of the target SSB, n is an integer greater than 1, and i is a natural number smaller than n; and determining the sequence number corresponding to the energy value meeting the target condition in the n energy values as the sequence number of the target SSB. The sequence number detection method of the embodiment of the application fully utilizes the reliable prior information SS, and improves the accuracy of SSB sequence number detection.

Description

Method, device, terminal and storage medium for detecting sequence number of synchronous signal block

Technical Field

The embodiment of the application relates to the technical field of communication, in particular to a method, a device, a terminal and a storage medium for detecting sequence numbers of synchronous signal blocks.

Background

3GPP (3 rd Generation Partnership Project, third generation partnership project) proposes that in an NR (New Radio) system, a cell primary and secondary SS (Synchronization Signal ) and a PBCH (Physical Broadcast Channel, physical broadcast channel) are coupled to some extent, and appear in the form of SS/PBCH resource Blocks, and the SS/PBCH resource Blocks are abbreviated as SSBs (SS/PBCH Blocks).

In the related art, there are at most 64 SSBs in one SS/PBCH period, and thus, the SSB index may be represented by 6 bits. Among them, the lowest 3 bits in the SSB index (hereinafter referred to as "SSB sequence number") determine the DMRS (Demodulation Reference Signals, demodulation-specific reference signal) scrambling sequence of the PBCH. Since the sequence number of the SSB is unknown before DMRS channel estimation is performed, it is necessary to assume the sequence number of the SSB and then blind-check the sequence number of the SSB using the DMRS determined based on the assumption to determine the actual sequence number of the SSB. For example, there are 8 cases (0 to 7) of the SSB sequence number, that is, 8 hypotheses of the SSB sequence number, for each hypothesis, the DMRS scrambling sequence is determined and channel estimation is performed, then the channel estimation result is transformed into the time domain to determine the PDP (Power Delay Profile, power Shi Yanpu), and the maximum diameter of the PDP is found to determine the energy corresponding to the maximum diameter of the PDP under each hypothesis, and the hypothesis with the largest energy is determined as the actual SSB sequence number.

However, in the case of low signal-to-noise ratio, since noise is dominant, the energy of the path is smaller than that of the noise, and when the related art performs maximum path selection, the noise is easily selected as the maximum path, which results in error in sequence number detection of SSB.

Disclosure of Invention

The embodiment of the application provides a method, a device, a terminal and a storage medium for detecting sequence numbers of synchronous signal blocks, which can be used for improving the accuracy of detecting the sequence numbers of the synchronous signal blocks. The technical scheme is as follows:

in one aspect, an embodiment of the present application provides a method for detecting a sequence number of a synchronization signal block, where the method includes:

determining a target path based on a first PDP, wherein the first PDP is a PDP corresponding to an SS in a target SSB;

determining the energy values corresponding to the target diameters on n secondary PDPs respectively to obtain n energy values; wherein, the second PDP with the sequence number i in the n second PDPs is a PDP corresponding to the DMRS obtained based on the sequence number i of the target SSB, n is an integer greater than 1, and i is a natural number smaller than n;

and determining the serial number corresponding to the energy value meeting the target condition in the n energy values as the serial number of the target SSB.

On the other hand, an embodiment of the present application provides a sequence number detection apparatus for a synchronization signal block, where the apparatus includes:

and the target path selection module is used for determining a target path based on a first PDP, wherein the first PDP is the PDP corresponding to the SS in the target SSB.

The energy value determining module is used for determining the energy values corresponding to the target diameters on the n secondary PDPs respectively to obtain n energy values; the second PDP with the sequence number i in the n second PDPs is a PDP corresponding to the DMRS obtained based on the sequence number i of the target SSB, where n is an integer greater than 1, and i is a natural number smaller than n.

And the sequence number determining module is used for determining the sequence number corresponding to the energy value meeting the target condition in the n energy values as the sequence number of the target SSB.

In yet another aspect, an embodiment of the present application provides a terminal device, where the terminal device includes a processor and a memory, where the memory stores a computer program, and the computer program is loaded and executed by the processor to implement the method for detecting a synchronization signal block.

In yet another aspect, embodiments of the present application provide a computer readable storage medium having a computer program stored therein, the computer program being loaded and executed by a processor to implement the above method for detecting a synchronization signal block.

In yet another aspect, an embodiment of the present application provides a chip, where the chip includes a programmable logic circuit and/or program instructions, and when the chip runs on a terminal device, the chip is configured to implement a method for detecting a sequence number of a synchronization signal block as described above.

In yet another aspect, an embodiment of the present application provides a computer program product for implementing the method for detecting a sequence number of a synchronization signal block described above when the computer program product is executed by a processor of a terminal device.

The technical scheme provided by the embodiment of the application can bring the following beneficial effects:

the SSB sequence number corresponding to the hypothesis with the largest energy value is determined as the actual SSB sequence number by carrying out path selection judgment according to the PDP corresponding to the SS, then determining the energy of the selected path on the PDP corresponding to the DMRS obtained based on the SSB sequence numbers of multiple hypotheses, and thus a method for SSB sequence number detection by using prior information SS is provided. Compared with the prior art that the serial number detection is carried out by only utilizing the PDP corresponding to the DMRS, the serial number detection method of the embodiment of the application fully utilizes reliable prior information SS and improves the accuracy of SSB serial number detection. In addition, because the PDPs corresponding to SSs are the same under the assumption of different SSB sequence numbers, and the PDPs corresponding to DMRS are different, compared with the method that the positions of the selected paths are inconsistent when the PDPs corresponding to the DMRS different from each other under various assumptions are used for the path selection judgment, the method and the device for detecting the SSB sequence numbers in the embodiment of the invention use the PDPs corresponding to SSs which are the same under various assumptions for the path selection judgment, ensure that the positions of the selected paths on the PDPs corresponding to the DMRS under various assumptions are unified, avoid the deviation of calculated energy values caused by the non-uniformity of the positions of the selected paths, and improve the reliability and the accuracy of SSB sequence number detection.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a system architecture provided by one embodiment of the present application;

FIG. 2 is a schematic diagram of the time-frequency structure of an SSB provided in one embodiment of the present application;

FIG. 3 is a flowchart of a method for detecting sequence numbers of a synchronization signal block according to an embodiment of the present application;

fig. 4 is a flowchart of a method for detecting a sequence number of a synchronization signal block according to another embodiment of the present application;

fig. 5 is a block diagram of a sequence number detection device of a synchronization signal block according to an embodiment of the present application;

fig. 6 is a block diagram of a sequence number detection device of a synchronization signal block according to another embodiment of the present application;

fig. 7 is a block diagram of a terminal device according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The network architecture and the service scenario described in the embodiments of the present application are for more clearly describing the technical solution of the embodiments of the present application, and do not constitute a limitation on the technical solution provided in the embodiments of the present application, and those skilled in the art can know that, with the evolution of the network architecture and the appearance of the new service scenario, the technical solution provided in the embodiments of the present application is also applicable to similar technical problems.

Referring to fig. 1, a schematic diagram of a system architecture according to an embodiment of the present application is shown. The system architecture may include: a terminal device 10 and a network device 20.

The number of terminal devices 10 is typically plural, and one or more terminal devices 10 may be distributed within a cell managed by each network device 20. The terminal device 10 may include various handheld devices, in-vehicle devices, wearable devices, computing devices, or other processing devices connected to a wireless modem, as well as various forms of User Equipment (UE), mobile Station (MS), and the like, having wireless communication capabilities. For convenience of description, in the embodiment of the present application, the above-mentioned devices are collectively referred to as a terminal device.

The network device 20 is a means deployed in the access network to provide wireless communication functionality for the terminal device 10. The network device 20 may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. The names of network device-capable devices may vary in systems employing different radio access technologies, for example in 5G NR systems, called gndeb or gNB. As communication technology evolves, the name "network device" may change. For convenience of description, in the embodiment of the present application, the above-mentioned devices for providing the terminal device 10 with the wireless communication function are collectively referred to as a network device.

The "5G NR system" in the embodiments of the present disclosure may also be referred to as a 5G system or an NR system, but a person skilled in the art may understand the meaning thereof. The technical scheme described in the embodiment of the disclosure can be applied to a 5G NR system and also can be applied to a subsequent evolution system of the 5G NR system.

In one example, the network device 20 may send SSBs to the terminal device 10 for synchronization, system information acquisition, measurement, and the like. The synchronization signal block is obtained by coupling a cell primary and secondary SS and PBCH to a certain extent and is composed of three parts, namely PSS (Primary Synchronization Signal ), SSS (Secondary Synchronization Signal, secondary synchronization signal) and PBCH.

Referring to fig. 2, a schematic diagram of an SSB time-frequency structure according to an embodiment of the present application is shown. As can be seen from fig. 2, SSB occupies a total of 4 OFDM (Orthogonal Frequency Division Multiplexing ) symbols in the time domain; the frequency domain occupies 240 subcarriers (20 PRBs (Physical Resource Block, physical resource blocks)) with numbers of 0 to 239, respectively. As shown in fig. 2, PSS is located on 127 subcarriers in the middle of symbol 0; SSS is located on 127 subcarriers in the middle of symbol 2; the PBCH is located in symbol 1, symbol 3 and symbol 2, where the PBCH occupies all subcarriers on symbol 1 and symbol 3, i.e. subcarriers numbered 0 to 239, and occupies all subcarriers except the subcarriers occupied by SSS and the subcarriers for SSS protection on symbol 2. In addition, the DMRS is located in the middle of the PBCH, i.e., the DMRS has a total of three different symbols.

In one example, the terminal device may determine a DMRS scrambling sequence of the PBCH according to the lowest 3 bits in the SSB index (hereinafter referred to as "sequence number of SSB") and further perform signal estimation according to the DMRS scrambling sequence to demodulate downlink data transmitted in the PBCH. Since the sequence number of the SSB is unknown before DMRS channel estimation is performed, it is necessary to assume the sequence number of the SSB and then blind-check the sequence number of the SSB using the DMRS determined based on the assumption to determine the actual sequence number of the SSB. In the related art, detection of sequence numbers for SSBs is classified into a frequency domain scheme and a time domain scheme, as follows.

Frequency domain scheme: the SSB has 8 cases (0 to 7), that is, the SSB has 8 hypotheses, the DMRS scrambling sequence is determined for each hypothesis and channel estimation is performed, and then the correlation is calculated between the DMRS of different symbols using the obtained channel estimation result, so that the correlation between the DMRS of different symbols under each hypothesis can be determined, and the hypothesis with the highest correlation is determined as the actual SSB sequence.

Time domain scheme: as described in the frequency domain scheme, the SSB has 8 hypotheses, for each hypothesis, a DMRS scrambling sequence is determined and channel estimation is performed, then the channel estimation result is transformed into the time domain to determine the PDP, and the maximum path of the PDP is obtained to determine the energy corresponding to the maximum path of the PDP under each hypothesis, and the hypothesis with the maximum energy is determined as the actual SSB sequence. Or the absolute position of the selected path may be specified in the PDP under each hypothesis to determine the energy corresponding to the selected path in the PDP under each hypothesis, and the hypothesis with the largest energy is determined as the actual SSB number.

However, under the condition of low signal-to-noise ratio, since noise is dominant, the energy of the path is smaller than that of the noise, and at this time, in the frequency domain scheme provided by the related technology, correlation calculation between DMRS of different symbols is inaccurate, so that the finally determined actual SSB sequence number is also inaccurate; in the time domain scheme provided by the related art, when the maximum diameter is selected, noise is easily selected as the maximum diameter, and therefore the finally determined actual SSB sequence number is also inaccurate. In addition, for the frequency domain scheme provided by the related art, under the scene of having frequency offset or doppler shift, the calculated phases of the DMRS of different symbols are different, in this case, a part of the DMRS may be considered as noise, so that the calculated correlation of the DMRS of different symbols is smaller, and the robustness is poor. In addition, with respect to the time domain scheme provided by the related art, if the absolute position of the selected path in the PDP under each hypothesis is defined, the actually selected path may not be the path corresponding to the defined absolute position for the scene which is sometimes biased, thereby also resulting in poor robustness.

Based on this, the embodiment of the application provides a sequence number detection method, which can be used for solving the technical problems. In the following, the technical solutions of the present application are described through several exemplary embodiments.

Referring to fig. 3, a flowchart of a method for detecting a sequence number of a synchronization signal block according to an embodiment of the present application is shown, and the method may be applied to the system architecture shown in fig. 1, for example, to the terminal device 10 in the system architecture shown in fig. 1. The method may include the following steps (310-330):

in step 310, the target path is determined based on the first PDP, which is the PDP corresponding to the SS in the target SSB.

Before channel estimation is performed, the SS sequence and the corresponding received signal are known, and the terminal device can determine the PDP corresponding to the SS, i.e., the first PDP, using the known information. The terminal device then makes a path selection decision using the first PDP, i.e. determines the target path based on the first PDP. Because the QCL (Quasi Co-Located) is between the PBCH and the SS, the doppler shift, the doppler spread, the delay spread, the average delay and the like between the two are consistent, and the prior information of the SS is fully utilized to perform the path selection judgment by determining the target path based on the PDP corresponding to the SS, so that the time offset problem and the frequency offset problem in certain scenes can be effectively resisted, the accuracy of path selection is improved, and the robustness is higher. For the process of determining the target path by the terminal device, please refer to the following method embodiments, which are not repeated here.

In one example, the process of the terminal device determining the first PDP may include: acquiring a first channel estimation result, wherein the first channel estimation result is a channel estimation result corresponding to the SS; transforming the first channel estimation result to a time domain to obtain a first time domain CIR sequence; the first PDP is determined based on the first time domain CIR sequence.

The terminal equipment can utilize the SS sequence and the corresponding known information such as the received signal and the like to perform the channel estimation of the SS, and obtain a first channel estimation result. Optionally, the obtaining the first channel estimation result includes: generating a first sequence according to the cell identifier, wherein the first sequence is a sequence corresponding to the SS; acquiring frequency domain data of an SS; and carrying out channel estimation on the SS according to the first sequence and the frequency domain data of the SS to obtain a first channel estimation result. Wherein the cell identity is used to identify the serving cell, optionally the cell identity is a cell ID (Identifier). On the one hand, the terminal equipment can generate a sequence corresponding to the SS, namely a first sequence, according to the cell identifier; on the other hand, the terminal device may extract the frequency domain data of the SS from the received signal to acquire the frequency domain data of the SS. Optionally, the length of the first sequence and the length of the frequency domain data are the same, and illustratively, the length of the first sequence and the length of the frequency domain data are both 127. Based on the first sequence and the frequency domain data, the terminal device may perform channel estimation by the SS to obtain a first channel estimation result. The channel estimation manner is not limited in the embodiments of the present application, and optionally, the terminal device performs LS (Least square) channel estimation on the SS.

After obtaining the first channel estimation result, the terminal device may transform the first channel estimation result to a time domain to obtain a first time domain CIR (Channel Impluse Response, channel impulse response) sequence. The method for the terminal device to acquire the first time domain CIR sequence is not limited in this embodiment, and optionally, the terminal device may perform IFFT (Inverse Fast Fourier Transform ) operation on the first channel estimation result to obtain the first time domain CIR sequence.

The terminal equipment can calculate the PDP corresponding to the SS, namely the first PDP by using the first time domain CIR sequence. Optionally, the determining the first PDP according to the first time domain CIR sequence includes: determining a PDP corresponding to at least one receiving device according to the CIR sequence of the first time domain; and combining the PDPs corresponding to the at least one receiving device to obtain a first PDP. Optionally, the receiving device comprises a receiving antenna. In the embodiment of the present application, the manner of combining the PDPs corresponding to the at least one receiving device by the terminal device is not limited, and optionally, the terminal device uses MRC (Maximum Ratio Combining ) to combine the PDPs corresponding to the at least one receiving device, so as to obtain the first PDP, and by performing MRC combining on the PDPs corresponding to the at least one receiving device, the quality of the received signal of the terminal device can be effectively improved.

In one example, the SS is SSs. Because the PSS sequences of different service cells under the network equipment have larger probability and the SSS sequences have smaller probability, compared with the PSS, the SSS is less interfered by aiming at the different service cells, and the accuracy of selecting the paths can be further improved by adopting the PDP corresponding to the SSS to perform the path selection judgment.

Step 320, determining the energy values corresponding to the target diameters on the n second PDPs respectively to obtain n energy values; among the n secondary PDPs, the secondary PDP with the sequence number i corresponds to the DMRS obtained based on the sequence number i of the target SSB, n is an integer greater than 1, and i is a natural number smaller than n.

The terminal device finally performs blind detection on the sequence number of the target SSB according to the DMRS, so that the terminal device also needs to determine the PDP corresponding to the DMRS. For each of n hypotheses of sequence numbers of target SSBs, the terminal device may determine a DMRS based on the hypothesis and then determine a PDP corresponding to the DMRS, that is, a secondary PDP. Alternatively, since the sequence number of the target SSB is the lowest 3 bits in the target SSB index, each bit has a value of 0 or 1, the sequence number of the target SSB has 8 possible hypotheses, that is, n has a value of 8.

In one example, the terminal device determines a secondary PDP with a sequence number i, comprising: acquiring a second channel estimation result, wherein the second channel estimation result is a channel estimation result corresponding to the DMRS obtained based on the sequence number i of the target SSB; transforming the second channel estimation result to a time domain to obtain a second time domain CIR sequence; and determining the second PDP with the sequence number of i according to the second time domain CIR sequence.

For each SSB sequence number of the n possible target SSBs, the terminal device may determine the DMRS according to the SSB sequence number, and further determine a channel estimation result corresponding to the DMRS, that is, a second channel estimation result. Optionally, the obtaining the second channel estimation result includes: generating a second sequence according to the cell identifier and the sequence number i of the target SSB; acquiring received data corresponding to the position of the DMRS; and carrying out channel estimation on the DMRS according to the second sequence and the received data to obtain a second channel estimation result. For description of the cell identifier, please refer to the above method embodiment, and details are not repeated here. On the one hand, the terminal equipment generates a sequence corresponding to the DMRS, namely a second sequence according to the cell identifier and the assumed sequence number i of the target SSB; on the other hand, the terminal device acquires the received data of the DMRS position. Optionally, the length of the second sequence is the same as the length of the received data. And according to the second sequence and the received data, the terminal equipment can perform channel estimation on the DMRS to obtain a second channel estimation result. For description of channel estimation, please refer to the above method embodiments, and details are not repeated here.

After obtaining the second channel estimation result, the terminal device may transform the second channel estimation result to the time domain, so as to obtain a second time domain CIR sequence. For description of the terminal device acquiring the second time domain CIR sequence, please refer to the description of the terminal device acquiring the first time domain CIR sequence, which is not repeated herein.

And using the second time domain CIR sequence, the terminal equipment can calculate the PDP corresponding to the DMRS, namely the second PDP. Optionally, the determining the second PDP with the sequence number i according to the second time domain CIR sequence includes: determining a PDP corresponding to at least one receiving device according to the second time domain CIR sequence; and combining the PDP corresponding to at least one receiving device with the PDP with different symbols to obtain a second PDP. In this embodiment of the present application, since the DMRS is located on 3 symbols in the SSB, the DMRS has 3 different symbols, and the combining process needs to be performed on the PDPs under the three different symbols, and optionally, the terminal device directly combines the PDPs under the different symbols. For the procedure of combining the PDPs corresponding to at least one receiving apparatus, please refer to the above method embodiment, and the description is omitted herein. For the sequence numbers of n possible target SSBs, the terminal device calculates the PDP corresponding to the DMRS by adopting the calculation method of the second PDP with the sequence number i, so that n second PDPs can be obtained.

In one example, after the step 310, the method further includes: and determining the positions of the target paths in the n secondary PDPs according to the positions of the target paths in the primary PDPs, wherein the positions of the target paths in the n secondary PDPs are used for determining n energy values.

After determining the target path based on the first PDP, the terminal device may convert the position of the target path on the first PDP to the second PDP according to the conversion relationship between the first PDP and the second PDP, thereby determining the energy values corresponding to the target path on the n second PDPs, respectively. Optionally, determining the positions of the target paths in the n second PDPs according to the positions of the target paths in the first PDP includes: acquiring the sampling rate of a first PDP and the sampling rate of a second PDP; and determining the positions of the target paths in the n secondary PDPs according to the sampling rate of the primary PDP, the sampling rate of the secondary PDP and the positions of the target paths in the primary PDP. In this embodiment of the present application, the terminal device obtains the sampling rates of the n secondary PDPs, and optionally, since the sampling rates of the n secondary PDPs are the same in normal circumstances, the terminal device may only obtain the sampling rate of any one secondary PDP of the n secondary PDPs. The terminal device may convert the sampling rates of the first PDP and the second PDP according to the sampling rates of the first PDP and the second PDP, to obtain a conversion relationship between the time domain position in the first PDP and the time domain position in the second PDP. The terminal equipment can obtain the time domain positions of the target diameter in the n second PDPs according to the time domain positions of the target diameter in the first PDP and the conversion relation, and further, the terminal equipment can determine the energy values, namely n energy values, corresponding to the target diameter on the n second PDPs respectively.

In one example, the determining the energy values of the target paths on the n secondary PDPs includes: for the number i of the n secondary PDPs, when the number of the target paths is greater than 1, determining the sum of the energies of the target paths on the ith secondary PDP as the energy value of the number i. Since the PBCH channel may be a multipath channel, the number of target paths selected by the terminal device may also be multiple. For a secondary PDP with a sequence number i in the n secondary PDPs, when the number of the target paths is a plurality, the terminal equipment determines the sum of the energy of the target paths on the secondary PDP with the sequence number i as the energy value of the sequence number i.

And 330, determining the sequence number corresponding to the energy value meeting the target condition in the n energy values as the sequence number of the target SSB.

After determining the energy values corresponding to the target paths on the n secondary PDPs respectively, the terminal device may select the energy value satisfying the target condition from the energy values, and determine the sequence number corresponding to the energy value as the sequence number of the target SSB. Optionally, the target condition is that the energy value is maximum, that is, the terminal device determines the sequence number corresponding to the maximum energy value in the n energy values as the sequence number of the target SSB.

In one example, the target SSB is located in a target SSB burst set; the method further comprises the following steps: determining the sequence numbers of other SSBs in the target SSB burst set based on the sequence number i of the target SSB; and combining the PDPs corresponding to the DMRS obtained based on the serial numbers of each SSB in the target SSB burst set to obtain a second PDP with the serial number i.

For a plurality of SSBs included in one SSB burst set, the terminal device can derive the sequence number of one of the SSBs in the plurality of SSBs by specifying the sequence number of the other SSB. In the embodiment of the present application, the terminal device may determine the sequence numbers of other SSBs in the target SSB burst set where the target SSB is located based on the sequence number i of the target SSB, so that, for each SSB in the target SSB burst set, a PDP corresponding to the DMRS obtained based on the SSB may be determined, and then the terminal device merges the PDPs corresponding to each SSB in the target SSB to obtain a second PDP with the sequence number i. By combining PDPs corresponding to all SSBs in the SSB burst set where the target SSB is located, the influence of noise on the PDP corresponding to the DMRS can be reduced, so that the PDP corresponding to the DMRS is more accurate, the sequence number of the target SSB determined according to the PDP corresponding to the DMRS is more accurate, and the SSB sequence number detection performance under low signal-to-noise ratio is improved.

In summary, according to the technical solution provided in the embodiments of the present application, the method for detecting the SSB sequence number by using the prior information SS is provided by performing the path selection decision according to the PDP corresponding to the SS, then determining the energy of the selected path on the PDP corresponding to the DMRS obtained based on the SSB sequence numbers of multiple hypotheses, and determining the SSB sequence number corresponding to the hypothesis with the largest energy value as the actual SSB sequence number. Compared with the prior art that the serial number detection is carried out by only utilizing the PDP corresponding to the DMRS, the serial number detection method of the embodiment of the application fully utilizes reliable prior information SS and improves the accuracy of SSB serial number detection. In addition, because the PDPs corresponding to SSs are the same under the assumption of different SSB sequence numbers, and the PDPs corresponding to DMRS are different, compared with the method that the positions of the selected paths are inconsistent when the PDPs corresponding to the DMRS different from each other under various assumptions are used for the path selection judgment, the method and the device for detecting the SSB sequence numbers in the embodiment of the invention use the PDPs corresponding to SSs which are the same under various assumptions for the path selection judgment, ensure that the positions of the selected paths on the PDPs corresponding to the DMRS under various assumptions are unified, avoid the deviation of calculated energy values caused by the non-uniformity of the positions of the selected paths, and improve the reliability and the accuracy of SSB sequence number detection.

The procedure of determining the target path by the terminal device will be described.

In one example, the determining the target diameter based on the first PDP includes the following steps:

(1) A first noise, which is noise of the first PDP, and a first maximum diameter, which is a maximum diameter of the first PDP, are determined.

After the terminal device determines the first PDP, the noise and the maximum diameter of the first PDP, that is, the first noise and the first maximum diameter, may be further determined. After the first PDP is determined, the path of the first PDP is determined, and the terminal device may select the path with the largest energy value from the paths as the largest path. In general, the energy of the path of the PDP does not exceed a certain range, and if the energy of some time domain positions exceeds the range, it is considered that these time domain positions correspond to noise. Optionally, the terminal device determines the first noise according to a preset time domain position, which is not limited in the embodiment of the present application, and in practical application, the preset time domain position may be obtained through repeated experiments and theoretical deductions.

(2) And determining a path selection threshold according to the first noise and the first maximum path.

The terminal device may determine a threshold value for determining the target path, i.e., a path selection threshold, using the noise and the maximum path of the first PDP. The specific determining manner of the path selection threshold in the embodiment of the present application is not limited, and optionally, the determining the path selection threshold according to the first noise and the first maximum path includes: obtaining a first threshold based on the first noise and the first factor; obtaining a second threshold based on the first maximum diameter and the second factor; and determining the threshold with the maximum value in the first threshold and the second threshold as a path selection threshold. Optionally, the terminal device multiplies the first noise by a first factor to obtain a first threshold; and multiplying the second noise by a second factor to obtain a second threshold. Wherein the value of the first factor is different from the value of the second factor. The specific values of the first factor and the second factor are not limited, and in practical application, the specific values can be obtained by combining repeated experiments and theoretical deductions. After the first threshold and the second threshold are calculated, the terminal device may determine the threshold with the larger threshold value as the path selection threshold.

(3) And determining the target path based on the first PDP according to the path selection threshold.

In the embodiment of the application, the terminal equipment determines the target path based on the first PDP according to the path selection threshold, and optionally, the terminal equipment takes the path with the energy greater than the path selection threshold in the first PDP as the target path. Compared with the method that only one target path can be selected when the maximum path in the second PDP is directly used as the target path, the method and the device for detecting the multipath channel determine the target path based on the first PDP according to the path selection threshold, can adaptively adjust the number of the selected paths according to the current channel condition, and effectively improve the detection performance of the multipath channel. In addition, for some time bias-existing scenarios, compared with the related art that the paths of the designated time domain positions in the second PDP are determined as target paths under various assumptions, the positions of the target paths selected under various assumptions may be inconsistent.

In summary, according to the technical scheme provided by the embodiment of the application, the noise and the maximum diameter are determined through the PDP corresponding to the SS, then the diameter selection threshold is determined according to the noise and the maximum diameter, and the diameter selection judgment is performed according to the diameter selection threshold, so that an effective mode of the diameter selection judgment is provided. In addition, the embodiment of the application carries out the path selection judgment according to the path selection threshold, the path selection quantity can be adaptively adjusted according to the current channel condition, the detection performance of the multipath channel is effectively improved, and the flexibility of the path selection judgment is improved. In addition, by the method for judging the diameter selection in the embodiment of the application, under the assumption of serial numbers of all SSBs, the positions of the target diameters selected by the terminal equipment are unified, the problem that deviation occurs in the diameter selection positions in a time-offset scene is effectively avoided, and the accuracy of diameter selection is improved.

Referring to fig. 4, a flowchart of a method for detecting a sequence number of a synchronization signal block according to another embodiment of the present application is shown, and the method may be applied to the system architecture shown in fig. 1, for example, to the terminal device 10 in the system architecture shown in fig. 1. The method may include the following steps (410-430):

in step 410, LS channel estimation is performed on the SSS of the target SSB, so as to obtain a first channel estimation result. The terminal device may perform LS channel estimation on the SSS by using the SSS sequence and known information such as the corresponding received signal, to obtain a first channel estimation result.

Step 420, performing IFFT transformation on the first channel estimation result to obtain a first time domain CIR sequence. After obtaining the first channel estimation result, the terminal device may transform the first channel estimation result to a time domain through IFFT operation, so as to obtain a first time domain CIR sequence.

Step 430, determining the first PDP according to the first time domain CIR sequence. The terminal device can calculate the PDP corresponding to the SSS, i.e. the first PDP, by using the first time domain CIR sequence.

Step 440, determining a path selection threshold according to the first PDP. After the terminal device determines the first PDP, the noise and the maximum path of the first PDP may be further determined, and the threshold value for determining the target path, that is, the path selection threshold, may be determined by using the noise and the maximum path of the first PDP.

And 450, determining a target path based on the first PDP according to the path selection threshold. In the embodiment of the application, the terminal equipment determines the target path based on the first PDP according to the path selection threshold, and optionally, the terminal equipment takes the path with the energy greater than the path selection threshold in the first PDP as the target path.

Step 460, performing LS channel estimation on the DMRS obtained based on the sequence number i of the target SSB, to obtain a second channel estimation result. For each SSB sequence number of the n possible target SSBs, the terminal device may determine the DMRS according to the SSB sequence number, and further determine a channel estimation result corresponding to the DMRS, that is, a second channel estimation result.

And 470, performing IFFT transformation on the second channel estimation result to obtain a second time domain CIR sequence. After obtaining the second channel estimation result, the terminal device may transform the second channel estimation result to the time domain through IFFT operation, so as to obtain a second time domain CIR sequence.

And step 480, determining the second PDP with the sequence number of i according to the second CIR sequence. And using the second time domain CIR sequence, the terminal equipment can calculate the PDP corresponding to the DMRS, namely the second PDP.

Step 490, determining the energy value of the target path on the secondary PDP with sequence number i. After determining the target path based on the first PDP, the terminal device may convert the position of the target path on the first PDP to the second PDP according to the conversion relationship between the first PDP and the second PDP, thereby determining the energy values corresponding to the target path on the n second PDPs, respectively.

Step 400, determining the sequence number of the SSB corresponding to the maximum energy value in the energy values of the target paths on the n secondary PDPs as the sequence number of the target SSB. After determining the energy values corresponding to the target paths on the n secondary PDPs, the terminal device may select a maximum energy value from the energy values, and determine the sequence number corresponding to the maximum energy value as the sequence number of the target SSB.

The following are device embodiments of the present application, which may be used to perform method embodiments of the present application. For details not disclosed in the device embodiments of the present application, please refer to the method embodiments of the present application.

Referring to fig. 5, a block diagram of a sequence number detection apparatus for a synchronization signal block according to an embodiment of the present application is shown. The device has the function of realizing the method example, and the function can be realized by hardware or can be realized by executing corresponding software by hardware. The device may be the terminal device 10 in the system architecture shown in fig. 1, or may be provided in the terminal device 10 in the system architecture shown in fig. 1. As shown in fig. 5, the apparatus 500 may include: the system comprises a target path selection module 510, an energy value determination module 520 and a sequence number determination module 530.

The target path selection module 510 is configured to determine a target path based on a first PDP, where the first PDP is a PDP corresponding to an SS in the target SSB.

An energy value determining module 520, configured to determine energy values corresponding to the target paths on the n second PDPs, so as to obtain n energy values; the second PDP with the sequence number i in the n second PDPs is a PDP corresponding to the DMRS obtained based on the sequence number i of the target SSB, where n is an integer greater than 1, and i is a natural number smaller than n.

The sequence number determining module 530 is configured to determine, as the sequence number of the target SSB, the sequence number corresponding to the energy value satisfying the target condition in the n energy values.

In one example, as shown in fig. 6, the target path selection module 510 includes: an information determining unit 512 configured to determine a first noise and a first maximum diameter, the first noise being a noise of the first PDP, the first maximum diameter being a maximum diameter of the first PDP; a threshold determining unit 514, configured to determine a path selection threshold according to the first noise and the first maximum path; and a target path selecting unit 516, configured to select the target path from the first PDP according to the path selection threshold.

In one example, as shown in fig. 6, the threshold determining unit 514 is configured to: obtaining a first threshold based on the first noise and a first factor; obtaining a second threshold based on the first maximum diameter and a second factor; wherein the value of the first factor is different from the value of the second factor; and determining the threshold with the maximum value in the first threshold and the second threshold as the path selection threshold.

In one example, as shown in fig. 6, the apparatus 500 further includes: a first result obtaining module 542, configured to obtain a first channel estimation result, where the first channel estimation result is a channel estimation result corresponding to the SS; a first sequence determining module 544, configured to transform the first channel estimation result to a time domain, to obtain a first time domain CIR sequence; a first PDP determination module 546 is configured to determine the first PDP according to the first time domain CIR sequence.

In one example, as shown in fig. 6, the first PDP determination module 546 is configured to: determining a PDP corresponding to at least one receiving device according to the first time domain CIR sequence; and combining the PDPs corresponding to the at least one receiving device to obtain the first PDP.

In one example, as shown in fig. 6, the first result obtaining module 542 is configured to: generating a first sequence according to the cell identifier, wherein the first sequence is a sequence corresponding to the SS; acquiring frequency domain data of the SS; and carrying out channel estimation on the SS according to the first sequence and the frequency domain data of the SS to obtain the first channel estimation result.

In one example, the energy value determining module 520 is configured to: and for the second PDP with the sequence number i in the n second PDPs, when the number of the target paths is larger than 1, determining the sum of the energy of the target paths on the ith second PDP as the energy value of the sequence number i.

In one example, as shown in fig. 6, the apparatus 500 further includes: a second result obtaining module 552, configured to obtain a second channel estimation result, where the second channel estimation result is a channel estimation result corresponding to the DMRS obtained based on the sequence number i of the target SSB; a second sequence determining module 554, configured to transform the second channel estimation result to a time domain, so as to obtain a second time domain CIR sequence; a second PDP determining module 556, configured to determine the second PDP with the sequence number i according to the second time domain CIR sequence.

In one example, as shown in fig. 6, the apparatus 500 further includes a position conversion module 560 configured to: and determining the positions of the target paths in the n second PDPs according to the positions of the target paths in the first PDP, wherein the positions of the target paths in the n second PDPs are used for determining the n energy values.

In one example, as shown in fig. 6, the position conversion module 560 is configured to: acquiring the sampling rate of a first PDP and the sampling rate of the second PDP; and determining the positions of the target paths in the n second PDPs according to the sampling rate of the first PDP, the sampling rate of the second PDP and the positions of the target paths in the first PDP.

In one example, the SS is a secondary synchronization signal SSs.

In one example, the target SSB is located in a target SSB burst set; the device further comprises: a sequence number determining module 572 configured to determine a sequence number of other SSBs in the target SSB burst set based on the sequence number i of the target SSB; and a PDP merging module 574, configured to merge the PDPs corresponding to the DMRS obtained based on the sequence number of each SSB in the target SSB burst set, to obtain the second PDP with the sequence number i.

In addition, according to the technical scheme provided by the embodiment of the application, the noise and the maximum diameter are determined through the PDP corresponding to the SS, then the diameter selection threshold is determined according to the noise and the maximum diameter, and the diameter selection judgment is carried out according to the diameter selection threshold, so that an effective mode of the diameter selection judgment is provided. In addition, the embodiment of the application carries out the path selection judgment according to the path selection threshold, the path selection quantity can be adaptively adjusted according to the current channel condition, the detection performance of the multipath channel is effectively improved, and the flexibility of the path selection judgment is improved. In addition, by the method for judging the diameter selection in the embodiment of the application, under the assumption of serial numbers of all SSBs, the positions of the target diameters selected by the terminal equipment are unified, the problem that deviation occurs in the diameter selection positions in a time-offset scene is effectively avoided, and the accuracy of diameter selection is improved.

It should be noted that, when the apparatus provided in the foregoing embodiment performs the functions thereof, only the division of the foregoing functional modules is used as an example, in practical application, the foregoing functional allocation may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules, so as to perform all or part of the functions described above. In addition, the apparatus and the method embodiments provided in the foregoing embodiments belong to the same concept, and specific implementation processes of the apparatus and the method embodiments are detailed in the method embodiments and are not repeated herein.

Referring to fig. 7, a block diagram of a terminal device according to an embodiment of the present application is shown.

The terminal in the embodiment of the application may include one or more of the following components: a processor 710 and a memory 720.

Processor 710 may include one or more processing cores. The processor 710 connects various parts within the overall terminal device using various interfaces and lines, performs various functions of the terminal device and processes data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 720, and invoking data stored in the memory 720. Alternatively, the processor 710 may be implemented in hardware in at least one of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), programmable logic array (Programmable Logic Array, PLA). The processor 710 may integrate one or a combination of several of a central processing unit (Central Processing Unit, CPU) and a modem etc. Wherein, the CPU mainly processes an operating system, application programs and the like; the modem is used to handle wireless communications. It will be appreciated that the modem may not be integrated into the processor 710 and may be implemented by a single chip.

Optionally, the processor 710, when executing program instructions in the memory 720, implements the methods provided by the various method embodiments described above.

The Memory 720 may include a random access Memory (Random Access Memory, RAM) or a Read-Only Memory (ROM). Optionally, the memory 720 includes a non-transitory computer-readable medium (non-transitory computer-readable storage medium). Memory 720 may be used to store instructions, programs, code, sets of codes, or sets of instructions. The memory 720 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for at least one function, instructions for implementing the various method embodiments described above, and the like; the storage data area may store data created according to the use of the terminal, etc.

The structure of the above-described terminal is merely illustrative, and the terminal device may include more or less components in actual implementation, such as: a display screen, etc., which is not limited in this embodiment.

It will be appreciated by those skilled in the art that the structure shown in fig. 7 is not limiting of the terminal and may include more or fewer components than shown, or may combine certain components, or may employ a different arrangement of components.

In an exemplary embodiment, there is also provided a computer readable storage medium having stored therein a computer program loaded and executed by a processor of a terminal device to implement the above-described sequence number detection method of a synchronization signal block.

Alternatively, the computer-readable storage medium may include: read-only memory, random access memory, solid state disk (SSD, solid State Drives), or optical disk, etc. The random access memory may include resistive random access memory (ReRAM, resistance Random Access Memory) and dynamic random access memory (DRAM, dynamic Random Access Memory), among others.

In an exemplary embodiment, a chip is also provided, which includes programmable logic circuits and/or program instructions for implementing the sequence number detection method of the synchronization signal block as described above, when the chip is run on a terminal device.

In an exemplary embodiment, a computer program product is also provided, which, when being executed by a processor of a terminal device, is adapted to implement the above-mentioned method of sequence number detection of synchronization signal blocks.

Those skilled in the art will appreciate that in one or more of the examples described above, the functions described in the embodiments of the present application may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, these functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The foregoing description of the exemplary embodiments of the present application is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, alternatives, and alternatives falling within the spirit and scope of the invention.

Claims

1. A method for detecting sequence numbers of synchronous signal blocks, the method comprising:

determining a target path based on a first power delay spectrum PDP, wherein the first PDP is a PDP corresponding to a synchronizing signal SS in a target synchronizing signal block SSB;

determining the positions of the target paths in n secondary PDPs according to the positions of the target paths in the primary PDP; wherein, the second PDP with the sequence number i in the n second PDPs is a PDP corresponding to a demodulation dedicated reference signal DMRS obtained based on the sequence number i of the target SSB, n is an integer greater than 1, and i is a natural number smaller than n;

according to the positions of the target diameter in the n secondary PDPs, determining the energy values respectively corresponding to the target diameter on the n secondary PDPs to obtain n energy values;

2. The method of claim 1, wherein the determining the target diameter based on the first PDP comprises:

Determining a first noise and a first maximum diameter, wherein the first noise is the noise of the first PDP, and the first maximum diameter is the maximum diameter of the first PDP;

determining a path selection threshold according to the first noise and the first maximum path;

and selecting the target path from the first PDP according to the path selection threshold.

3. The method of claim 2, wherein said determining a path selection threshold based on said first noise and said first maximum path comprises:

obtaining a first threshold based on the first noise and a first factor;

obtaining a second threshold based on the first maximum diameter and a second factor; wherein the value of the first factor is different from the value of the second factor;

and determining the threshold with the maximum value in the first threshold and the second threshold as the path selection threshold.

4. The method of claim 1, further comprising, prior to selecting the target path from the first PDP:

acquiring a first channel estimation result, wherein the first channel estimation result is a channel estimation result corresponding to the SS;

transforming the first channel estimation result to a time domain to obtain a first time domain channel impulse response CIR sequence;

And determining the first PDP according to the first time domain CIR sequence.

5. The method of claim 4, wherein the determining the first PDP from the first time domain CIR sequence comprises:

determining a PDP corresponding to at least one receiving device according to the first time domain CIR sequence;

and combining the PDPs corresponding to the at least one receiving device to obtain the first PDP.

6. The method of claim 4, wherein the obtaining the first channel estimation result comprises:

generating a first sequence according to the cell identifier, wherein the first sequence is a sequence corresponding to the SS;

acquiring frequency domain data of the SS;

and carrying out channel estimation on the SS according to the first sequence and the frequency domain data of the SS to obtain the first channel estimation result.

7. The method of claim 1, wherein determining the energy values for the target paths on the n secondary PDPs, respectively, comprises:

and for the secondary PDPs with the sequence number i in the n secondary PDPs, when the number of the target paths is larger than 1, determining the sum of the energy of the target paths on the ith secondary PDP as the energy value with the sequence number i.

8. The method of claim 1, wherein determining the target diameter precedes the respective corresponding energy values on the n secondary PDPs further comprises:

acquiring a second channel estimation result, wherein the second channel estimation result is a channel estimation result corresponding to the DMRS obtained based on the sequence number i of the target SSB;

transforming the second channel estimation result to a time domain to obtain a second time domain CIR sequence;

and determining the second PDP with the sequence number of i according to the second time domain CIR sequence.

9. The method of claim 1, wherein determining the location of the target diameter in the n secondary PDPs based on the location of the target diameter in the primary PDP comprises:

acquiring the sampling rate of a first PDP and the sampling rate of the second PDP;

and determining the positions of the target paths in the n second PDPs according to the sampling rate of the first PDP, the sampling rate of the second PDP and the positions of the target paths in the first PDP.

10. The method of claim 1, wherein the SS is a secondary synchronization signal SSs.

11. The method according to any of claims 1 to 10, wherein the target SSB is located in a target SSB burst set; the method further comprises the steps of:

Determining the sequence numbers of other SSBs in the target SSB burst set based on the sequence number i of the target SSB;

and merging the PDPs corresponding to the DMRS obtained based on the serial numbers of each SSB in the target SSB burst set to obtain the second PDP with the serial number i.

12. A sequence number detection apparatus for a synchronization signal block, the apparatus comprising:

the target path selection module is used for determining a target path based on a first power delay spectrum PDP, wherein the first PDP is a PDP corresponding to a synchronizing signal SS in a target synchronizing signal block SSB;

an energy value determining module, configured to determine positions of the target paths in n second PDPs according to positions of the target paths in the first PDP; wherein, the second PDP with the sequence number i in the n second PDPs is a PDP corresponding to a demodulation dedicated reference signal DMRS obtained based on the sequence number i of the target SSB, n is an integer greater than 1, and i is a natural number smaller than n; according to the positions of the target diameter in the n secondary PDPs, determining the energy values respectively corresponding to the target diameter on the n secondary PDPs to obtain n energy values;

13. A terminal device, characterized in that it comprises a processor and a memory, the memory storing a computer program, which is loaded and executed by the processor to implement the method of detecting a synchronization signal block according to any one of claims 1 to 11.

14. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program, which is loaded and executed by a processor to implement the method of detecting a synchronization signal block according to any one of claims 1 to 11.