CN112187330B - Method, device, terminal and storage medium for detecting beam index - Google Patents

Abstract

Embodiments of the present application provide a method, an apparatus, a terminal, and a storage medium for detecting a beam index. The method includes: obtaining the channel estimation result of the SSS according to the known SSS sequence and the received SSS sequence; determining the frequency domain metric value corresponding to each candidate DMRS according to the channel estimation result of the SSS, and the frequency domain metric value is used for quantizing the received sequence and reconstructing The degree of difference between the sequences, the reconstructed sequence is determined based on the channel estimation result of the SSS and the candidate DMRS; the target DMRS is determined in each DMRS according to the frequency domain metric value corresponding to each DMRS; the beam index corresponding to the target DMRS is determined as the target Beam index. The technical solutions provided by the embodiments of the present application can reduce the amount of calculation for determining the beam index, reduce the complexity, and improve the efficiency of determining the beam index.

Description

Method, device, terminal and storage medium for detecting beam index

technical field

The embodiments of the present application relate to the field of wireless communication technologies, and in particular, to a method, an apparatus, a terminal, and a storage medium for detecting a beam index.

Background technique

In a New Radio (NR) system, when a cell number is successfully detected in a cell search process, channel estimation needs to be performed based on a demodulation reference signal (Reference Signal, DMRS) to obtain a channel estimation result to complete the subsequent process.

Since the 3rd Generation Partnership Project (3GPP) protocol stipulates the following: the scrambling sequence of the DMRS will change with the change of the L transmit beams on the base station side, so the terminal needs to be in the L beams. The corresponding beam index is detected, and then channel estimation can be performed based on the corresponding DMRS sequence.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a method, an apparatus, a terminal, and a storage medium for detecting a beam index. The technical solution is as follows:

On the one hand, an embodiment of the present application provides a method for detecting a beam index, the method comprising:

Obtain the channel estimation result of the SSS according to the known SSS sequence of the secondary synchronization signal and the received SSS sequence;

The frequency domain metric values corresponding to each candidate demodulation reference signal DMRS are determined according to the channel estimation results of the SSS, and the frequency domain metric values are used to quantify the degree of difference between the received sequence and the reconstructed sequence. The reconstructed sequence Determined based on the channel estimation result of the SSS and the candidate DMRS;

Determine a target DMRS in each of the DMRSs according to the frequency domain metric values corresponding to the respective DMRSs;

The beam index corresponding to the target DMRS is determined as the target beam index.

On the other hand, an embodiment of the present application provides an apparatus for detecting a beam index, and the apparatus includes:

The channel estimation module is used to obtain the channel estimation result of the SSS according to the known SSS sequence of the secondary synchronization signal and the received SSS sequence;

A metric value determination module, configured to determine frequency domain metric values corresponding to each candidate demodulation reference signal DMRS according to the channel estimation result of the SSS, where the frequency domain metric value is used to quantify the difference between the received sequence and the reconstructed sequence degree, the reconstruction sequence is determined based on the channel estimation result of the SSS and the candidate DMRS;

a target DMRS determination module, configured to determine a target DMRS in each of the DMRSs according to the frequency domain metric values corresponding to the respective DMRSs;

The beam index detection module is configured to determine the beam index corresponding to the target DMRS as the target beam index.

In yet another aspect, an embodiment of the present application provides a terminal, the terminal includes a processor and a memory, the memory stores a computer program, and the computer program is loaded and executed by the processor to implement the above-mentioned aspect The method of detecting the beam index.

In another aspect, an embodiment of the present application provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and the computer program is loaded and executed by a processor to implement the detection according to one aspect method for beam indexing.

In another aspect, an embodiment of the present application provides a chip, wherein the chip includes a processor and an interface, the processor obtains program instructions through the interface, and the processor is used to execute the program instructions, to perform the method for detecting a beam index according to an aspect.

In another aspect, an embodiment of the present application provides a computer program product, where the computer program product or computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the above-described method of detecting a beam index.

The beneficial effects that can be brought about by the technical solutions provided in the embodiments of the present application include at least:

The reconstructed sequence is obtained based on the prior information of the channel estimation result based on SSS and each candidate DMRS sequence, and then the difference between the reconstructed sequence and the received sequence is obtained, and the DMRS sequence with the smallest difference is determined as the required DMRS sequence. DMRS sequence, and then determine the beam index based on the above determined DMRS sequence, so as to reduce the calculation amount of determining the beam index, reduce the complexity, and improve the efficiency of determining the beam index.

Description of drawings

1 is a schematic diagram of an implementation environment provided by an embodiment of the present application;

2 is an architecture diagram of a protocol layer provided by an embodiment of the present application;

3 is a flowchart of a method for detecting a beam index provided by an embodiment of the present application;

4 is a flowchart of a method for detecting a beam index provided by another embodiment of the present application;

5 is a structural block diagram of an apparatus for detecting a beam index according to an embodiment of the present application;

FIG. 6 is a structural block diagram of a terminal according to an embodiment of the present application.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

The related terms involved in the embodiments of the present application are introduced below:

SSS: Secondary synchronization signal, used for cell group detection to obtain cell group ID, frame timing alignment, and CP length detection. In FDD mode, the SSS is located in the penultimate symbol of the first slot of subframes 0 and 5 in the synchronization signal block; in TDD mode, the SSS is located in the last symbol of subframes 0 and 5.

DMRS: demodulation reference signal, which is transmitted on the physical uplink control channel PUCCH and the uplink physical shared channel PUSCH, and is used for related demodulation of uplink control and data channels.

Beam Index: An index provides a pointer to a beam, which is the shape on the Earth's surface formed by electromagnetic waves emitted by a satellite antenna. The beam here mainly refers to the shaped beam.

Channel estimation: It is a process of estimating the model parameters of a certain channel model assumed from the received data. In the embodiment of the present application, channel estimation is performed based on the known SSS sequence and the received SSS sequence, and a channel estimation result is obtained.

Please refer to FIG. 1 , which shows a schematic diagram of an implementation environment provided by an embodiment of the present application. The implementation environment may be a wireless communication system, such as a fifth generation mobile communication technology system (5th generation wireless systems, 5G). The implementation environment includes a terminal 11 and an access network device 12 .

The terminal 11 may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to the wireless modem, as well as various forms of terminals (User Equipment, UE), mobile stations (Mobile Station, MS), terminal device (terminal device) and so on. For the convenience of description, the devices mentioned above are collectively referred to as terminals.

The access network device 12 may be a base station (Base Station, BS), and the base station is a device deployed in a wireless access network to provide a wireless communication function for a terminal. The base station may include various forms of macro base station, micro base station, relay station, access point and so on. In systems using different radio access technologies, the names of devices with base station functions may vary. In the embodiments of the present application, the above-mentioned apparatuses for providing wireless communication functions for terminals are collectively referred to as access network equipment.

The access network device 12 and the terminal 11 communicate with each other through a certain air interface technology, for example, they can communicate with each other through NR.

During the communication between the terminal 11 and the access network device 12, channel estimation needs to be performed based on the DMRS. Channel estimation is a process of estimating the model parameters of a certain channel model assumed from the received data. In the 5G communication system, the scrambling sequence of the DMRS will change with the L transmit beams on the base station side, so the terminal needs to detect the corresponding beam index in the L beams, and then can perform the scrambling based on the corresponding DMRS sequence. channel estimation.

FIG. 2 shows a schematic diagram of a protocol layer provided by an embodiment of the present application.

The protocol stack includes physical layer, medium access control MAC layer, radio link control RLC layer and packet data convergence protocol PDCP layer, RRC layer, NAS layer and application layer.

The physical layer is the lowest layer and implements various physical layer signal processing functions.

The MAC layer is used to control and connect the physical medium of the physical layer.

The RLC layer is used to control the radio link, providing a reliable link independent of the radio solution.

The PDCP layer is scheduled and controlled by the RRC layer, and transmits user data from the upper layer to the RLC layer.

The RRC layer is used for broadcasting system information and RRC connection control.

The NAS layer is the functional layer between the core network and the user equipment, and supports signaling and data transmission between the two.

The application layer provides the interface between applications on either side of the network, such as other functions such as remote access and management, e-mail, virtual middle-end, and directory services.

In the technical solution provided by the embodiments of the present application, the reconstructed sequence is obtained through the prior information based on the channel estimation result of the SSS and each candidate DMRS sequence, and then the difference degree between the reconstructed sequence and the received sequence is obtained, and the difference degree The smallest DMRS sequence is determined as the required DMRS sequence, and then the beam index is determined based on the determined DMRS sequence, which reduces the calculation amount of determining the beam index, reduces the complexity, and improves the efficiency of determining the beam index.

Please refer to FIG. 3 , which shows a method for detecting a beam index provided by an embodiment of the present application. The method is applied to the terminal switch in the embodiment shown in FIG. 1 , and the method includes:

Step 301: Obtain the channel estimation result of the SSS according to the known SSS sequence and the received SSS sequence.

Channel estimation is a process of estimating the model parameters of a certain channel model assumed from the received data. In this embodiment of the present application, the terminal obtains the channel estimation result of the SSS according to the known SSS sequence and the received SSS sequence. The known SSS sequence is the SSS sequence pre-existing locally in the terminal. The received SSS sequence refers to the SSS sequence received by the terminal.

Optionally, the channel estimation process is expressed by the following formula:

H _ls =SSS _rx /SSS _local .

H _ls is the channel estimation result of SSS, SSS _rx is the received SSS sequence, and SSS _local is the known SSS sequence.

Step 302: Determine the frequency domain metric values corresponding to each candidate demodulation reference signal DMRS according to the channel estimation result of the SSS.

The frequency domain metric is used to quantify the degree of difference between the received sequence and the reconstructed sequence. Optionally, there is a positive correlation between the frequency domain metric value and the degree of difference. That is, the larger the frequency domain metric value, the greater the degree of difference; the smaller the frequency domain metric value, the smaller the degree of difference.

Optionally, the terminal calculates the variance between the received sequence and the reconstructed sequence to obtain a frequency domain metric value.

The reconstructed sequence is determined based on the channel estimation result of the SSS and the candidate DMRS. The determination process of the reconstruction sequence will be explained in the following embodiments.

Step 303: Determine the target DMRS in each DMRS according to the corresponding frequency domain metric values of each DMRS.

Optionally, the terminal determines the DMRS with the smallest frequency domain metric value as the target DMRS.

Step 304: Determine the beam index corresponding to the target DMRS as the target beam index.

Optionally, the terminal pre-stores the correspondence between the target DMRS and the beam index, and by querying the above correspondence, the beam index corresponding to the target DMRS can be obtained as the target beam index. Table-1 exemplarily shows the correspondence between DMRS and beam indices.

Table 1

DMRS1 Beam Index 1 DMRS2 Beam Index 2 DMRS3 Beam Index 3 DMRS4 Beam Index 4 DMRS5 Beam Index 5

After that, the terminal determines the corresponding beam according to the beam index, and then performs channel estimation based on the corresponding DMRS sequence.

To sum up, the technical solutions provided by the embodiments of the present application obtain the reconstructed sequence based on the prior information of the channel estimation result based on the SSS and each candidate DMRS sequence, and then obtain the difference between the reconstructed sequence and the received sequence. degree, determine the DMRS sequence with the smallest degree of difference as the required DMRS sequence, and then determine the beam index based on the DMRS sequence determined above, reduce the calculation amount of determining the beam index, reduce the complexity, and improve the efficiency of determining the beam index .

The following explains how to determine the frequency domain metric values corresponding to each candidate DMRS according to the channel estimation result of the SSS. In an optional embodiment provided based on the embodiment shown in FIG. 3 , step 302 is replaced with the following sub-steps:

Step 302a, performing denoising processing on the channel estimation result of the SSS to obtain a channel filtering result.

The denoising process is used to filter out the noise components in the channel estimation result of the SSS. Optionally, the algorithm used in the denoising processing includes: minimum mean square error estimation (MMSE), time-domain Fourier transform (FFT) filtering, and the like.

Exemplarily, the denoising process is represented by the following formula:

H _filter = filter(H _ls , coef);

Among them, H _filter refers to the channel filtering result, filter refers to the filtering algorithm, H _ls refers to the channel estimation result, and coef refers to the filtering coefficient.

Step 302b, performing frequency domain expansion on the channel filtering result to obtain a channel expansion result.

The terminal expands the channel filtering results from the frequency domain, and expands M symmetrically, respectively, and the value of M is set according to experiments or experience, such as 1, 2, and so on.

The algorithm used for the frequency domain extension may be an interpolation method. Exemplarily, the frequency domain extension is expressed by the following formula:

H _fit =fit(H _filter , N _tap ).

Among them, H _fit refers to the channel expansion result, fit is the interpolation function, H _filter is the channel filtering result, and N _tap is the interpolation order.

In an example, the terminal performs frequency domain extension on the channel filtering result by using a polynomial interpolation method to obtain a channel extension result. This process is represented by the following formula:

Step 302c, acquiring the received sequence in the designated symbol in the synchronization signal block SSB at the same frequency domain position as the SSS and the channel extension result.

The designated symbols are preset. Optionally, the designated symbols are Symbol 1 and Symbol 3. The above receiving sequence is denoted as S.

Step 302d: Determine the frequency domain metric value according to the candidate DMRS, the channel extension result and the received sequence.

The terminal determines the reconstructed sequence according to the candidate DMRS and the channel extension result, and then calculates the frequency domain metric value based on the reconstructed sequence and the received sequence.

In a possible implementation manner, the terminal determines the product between the candidate DMRS and the channel extension result; and determines the frequency domain metric value according to the product and the received sequence. Exemplarily, this implementation is represented by the following formula:

M _l =∑|D _l *H _ext -S| ² .

Among them, M _l is the frequency domain metric value of the candidate DMRS sequence, D _l is the candidate DMRS sequence, H _ext is the channel extension result, and S is the received sequence.

In other possible implementation manners, the ratio between the received sequence and the candidate DMRS is determined; the frequency domain metric value is determined according to the ratio and the channel extension result. Exemplarily, this implementation is represented by the following formula:

M _l =∑|H _ext -S/D _l | ² .

Among them, M _l is the frequency domain metric value of the candidate DMRS sequence, D _l is the candidate DMRS sequence, H _ext is the channel extension result, and S is the received sequence.

It should be noted that the terminal may have multiple antennas. The following explains how to determine the frequency domain metric value corresponding to each candidate DMRS when there are multiple antennas. In an optional embodiment provided based on the embodiment shown in FIG. 3 , step 302 is further implemented as: when there are multiple antennas, for each candidate DMRS, determine an intermediate frequency domain metric value corresponding to the antenna; The corresponding intermediate frequency domain metric value is used to determine the frequency domain metric value corresponding to the candidate DMRS.

Refer to steps 302a-302d for the determination method of the intermediate frequency domain metric value, which is not limited here.

Optionally, the terminal determines the frequency domain metric value corresponding to the candidate DMRS according to the intermediate frequency domain metric value corresponding to each antenna, which is implemented as: acquiring the coefficient corresponding to each antenna; according to the intermediate frequency domain metric value corresponding to each antenna and each The coefficients corresponding to the antennas are used to determine the frequency domain metric value corresponding to the candidate DMRS.

Optionally, the coefficient corresponding to the antenna is preset, or is actually set by the terminal according to the signal-to-noise ratio.

Optionally, the terminal determines the product between the intermediate frequency domain metric value corresponding to each antenna and the coefficient corresponding to the antenna, and then determines the sum of the above products as the frequency domain metric value corresponding to the candidate DMRS.

Exemplarily, the terminal includes two antennas, and the frequency domain metric value corresponding to the above-mentioned root determination candidate DMRS is expressed by the following formula:

M _l =alfa*M _l1 +(1-alfa)*M _l2 .

alfa is the coefficient corresponding to the first antenna, M _l1 is the intermediate frequency domain metric value corresponding to the first antenna, 1-alfa is the coefficient corresponding to the second antenna, and M _l2 is the intermediate frequency domain metric corresponding to the second antenna value.

Please refer to FIG. 4 , which shows a flowchart of a method for detecting a beam index provided by an embodiment of the present application. The method includes:

Step 401, obtain the LS channel estimate of the SSS.

That is, the channel estimation result of the SSS is obtained according to the known SSS sequence and the received SSS sequence.

Step 402, LS channel estimation filtering.

The terminal performs denoising processing on the channel estimation result of the SSS to obtain a channel filtering result.

Step 403, channel estimation frequency domain extension.

The terminal performs frequency domain expansion on the channel filtering result to obtain the channel expansion result.

Step 404, the frequency domain received sequence is extracted.

The terminal acquires the receive sequence.

Step 405, metric value calculation.

For each candidate DMRS, the frequency domain metric value of the candidate DMRS is calculated according to the candidate DMRS, the channel extension result, and the received sequence.

Step 406, combining multiple antennas.

If the terminal has multiple antennas, for each candidate DMRS, calculate the intermediate frequency domain metric value corresponding to each antenna, and then determine the frequency domain metric value corresponding to the candidate DMRS based on the intermediate frequency domain metric value corresponding to each antenna.

Step 407, beam index decision.

The target DMRS is determined according to the frequency domain metric values corresponding to each candidate DMRS, and then the target beam index is determined according to the target DMRS.

To sum up, the technical solutions provided by the embodiments of the present application obtain the reconstructed sequence based on the prior information of the channel estimation result based on the SSS and each candidate DMRS sequence, and then obtain the difference between the reconstructed sequence and the received sequence. degree, determine the DMRS sequence with the smallest degree of difference as the required DMRS sequence, and then determine the beam index based on the DMRS sequence determined above, reduce the calculation amount of determining the beam index, reduce the complexity, and improve the efficiency of determining the beam index .

The following are device embodiments of the present application. For the parts that are not described in detail in the device embodiments, reference may be made to the technical details disclosed in the foregoing method embodiments.

Please refer to FIG. 5, which shows a block diagram of an apparatus for detecting a beam index provided by an exemplary embodiment of the present application. The apparatus for detecting the beam index may be implemented as all or a part of the terminal through software, hardware or a combination of the two. The device for detecting the beam index includes:

The channel estimation module 501 is configured to obtain the channel estimation result of the SSS according to the known SSS sequence of the secondary synchronization signal and the received SSS sequence.

The metric value determination module 502 is configured to determine, according to the channel estimation result of the SSS, the respective frequency domain metric values corresponding to each candidate demodulation reference signal DMRS, where the frequency domain metric values are used to quantize the difference between the received sequence and the reconstructed sequence. The degree of difference, the reconstructed sequence is determined based on the channel estimation result of the SSS and the candidate DMRS.

The target DMRS determination module 503 is configured to determine the target DMRS from the respective DMRSs according to the frequency domain metric values corresponding to the respective DMRSs.

The beam index detection module 504 is configured to determine the beam index corresponding to the target DMRS as the target beam index.

To sum up, the technical solutions provided by the embodiments of the present application obtain the reconstructed sequence based on the prior information of the channel estimation result based on the SSS and each candidate DMRS sequence, and then obtain the difference between the reconstructed sequence and the received sequence. degree, determine the DMRS sequence with the smallest degree of difference as the required DMRS sequence, then determine the beam index based on the DMRS sequence determined above, reduce the calculation amount of determining the beam index, reduce the complexity, and improve the efficiency of determining the beam index .

In an optional embodiment provided based on the embodiment shown in FIG. 5 , the metric value determination module 502 is configured to:

performing denoising processing on the channel estimation result of the SSS to obtain a channel filtering result;

performing frequency domain expansion on the channel filtering result to obtain a channel expansion result;

Obtain the received sequence at the same frequency domain position as the SSS and the channel extension result in the specified symbol in the synchronization signal block SSB;

The frequency domain metric value is determined according to the candidate DMRS, the channel spreading result and the received sequence.

Optionally, the metric value determination module 502 is configured to:

determining a product between the candidate DMRS and the channel extension result;

The frequency domain metric value is determined from the product and the received sequence.

Optionally, the metric value determination module 502 is configured to:

determining a ratio between the received sequence and the candidate DMRS;

The frequency domain metric value is determined according to the ratio and the channel spreading result.

In an optional embodiment provided based on the embodiment shown in FIG. 5 , the metric value determination module 502 is configured to:

When there are multiple antennas, for each candidate DMRS, determine an intermediate frequency domain metric value corresponding to the antenna;

The frequency domain metric value corresponding to the candidate DMRS is determined according to the intermediate frequency domain metric value corresponding to each of the antennas.

Optionally, the metric value determination module 502 is configured to:

obtaining the respective coefficients corresponding to each of the antennas;

The frequency domain metric value corresponding to the candidate DMRS is determined according to the intermediate frequency domain metric values corresponding to the respective antennas and the respective coefficients corresponding to the respective antennas.

In an optional embodiment provided based on the embodiment shown in FIG. 5 , the target DMRS determination module 503 is configured to determine the DMRS with the smallest frequency domain metric value as the target DMRS.

In an optional embodiment provided based on the embodiment shown in FIG. 5 , the beam index detection module 504 is configured to determine the beam index corresponding to the target DMRS as the beam index according to the correspondence between the beam index and the DMRS Target beam index.

It should be noted that, when the device provided in the above embodiment realizes its functions, only the division of the above functional modules is used as an example for illustration. The internal structure is divided into different functional modules to complete all or part of the functions described above. In addition, the apparatus and method embodiments provided in the above embodiments belong to the same concept, and the specific implementation process thereof is detailed in the method embodiments, which will not be repeated here.

FIG. 6 is a schematic structural diagram of a terminal according to an exemplary embodiment.

The terminal 600 includes a transmitter 601 , a receiver 602 and a processor 603 . The processor 603 may also be a controller, which is represented as “controller/processor 603” in FIG. 6 . Optionally, the terminal 600 may further include a modem processor 605 , where the modem processor 605 may include an encoder 606 , a modulator 607 , a decoder 608 and a demodulator 609 .

In one example, transmitter 601 conditions (eg, analog converts, filters, amplifies, and upconverts, etc.) the output sample and generates an uplink signal that is transmitted via an antenna to the connections described in the above embodiments access equipment. On the downlink, the antenna receives the downlink signal transmitted by the access network device in the above embodiment. The receiver 602 conditions (eg, filters, amplifies, downconverts, and digitizes, etc.) the signal received from the antenna and provides input samples. In modem processor 605, encoder 606 receives and processes (eg, formats, encodes, and interleaves) the traffic data and signaling messages to be sent on the uplink. Modulator 607 further processes (eg, symbol mapping and modulation) the encoded traffic data and signaling messages and provides output samples. A demodulator 609 processes (eg, demodulates) the input samples and provides symbol estimates. Decoder 608 processes (eg, deinterleaves and decodes) the symbol estimates and provides decoded data and signaling messages for transmission to terminal 600 . The encoder 606 , modulator 607 , demodulator 609 and decoder 608 may be implemented by a composite modem processor 605 . These elements are processed according to the radio access technology employed by the radio access network (eg, access technology of LTE and other evolved systems). It should be noted that, when the terminal 600 does not include the modulation and demodulation processor 605 , the above-mentioned functions of the modulation and demodulation processor 605 may also be performed by the processor 603 .

In this embodiment of the present application, the modulation and demodulation processor 605 controls and manages the actions of the terminal 600, so as to execute the processing process performed by the terminal 600 in the above-mentioned embodiments of the present disclosure. Further, the terminal 600 may further include a memory 604 for storing program codes and data for the terminal 600.

In an exemplary embodiment, a computer-readable storage medium is also provided, and at least one instruction is stored in the computer-readable storage medium, and the at least one instruction is loaded and executed by the processor of the terminal to implement the above method. The method of detecting the beam index in the example.

Alternatively, the above-mentioned computer-readable storage medium may be a ROM, a RAM, a magnetic tape, a floppy disk, an optical data storage device, and the like.

In an exemplary embodiment, there is also provided a computer program product, the computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the above-described method of detecting a beam index.

The above are only exemplary embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection of the present application. within the range.

Claims (11)

1. A method for detecting a beam index, wherein the method comprises: Obtain the channel estimation result of the SSS according to the known SSS sequence of the secondary synchronization signal and the received SSS sequence; wherein the known SSS sequence is the SSS sequence pre-existing locally in the terminal, and the received SSS sequence refers to the SSS received by the terminal sequence; The frequency domain metric values corresponding to each candidate demodulation reference signal DMRS are determined according to the channel estimation results of the SSS, and the frequency domain metric values are used to quantify the degree of difference between the received sequence and the reconstructed sequence. The reconstructed sequence Determined based on the channel estimation result of the SSS and the candidate DMRS; Determine a target DMRS in each of the DMRSs according to the frequency domain metric values corresponding to the respective DMRSs; The beam index corresponding to the target DMRS is determined as the target beam index. 2. The method according to claim 1, wherein the determining the frequency domain metric value corresponding to each candidate demodulation reference signal DMRS according to the channel estimation result of the secondary synchronization signal SSS comprises: performing denoising processing on the channel estimation result of the SSS to obtain a channel filtering result; performing frequency domain expansion on the channel filtering result to obtain a channel expansion result; Obtain the received sequence at the same frequency domain position as the SSS and the channel extension result in the specified symbol in the synchronization signal block SSB; The frequency domain metric value is determined according to the candidate DMRS, the channel spreading result and the received sequence. 3. The method according to claim 2, wherein the determining the frequency domain metric value according to the candidate DMRS, the channel spreading result and the received sequence comprises: determining a product between the candidate DMRS and the channel extension result; The frequency domain metric value is determined from the product and the received sequence. 4. The method according to claim 2, wherein the determining the frequency domain metric value according to the candidate DMRS, the channel spreading result and the received sequence comprises: determining a ratio between the received sequence and the candidate DMRS; The frequency domain metric value is determined according to the ratio and the channel spreading result. 5. The method according to claim 1, wherein determining the frequency domain metric values corresponding to each candidate demodulation reference signal DMRS according to the channel estimation result of the SSS, comprising: When there are multiple antennas, for each candidate DMRS, determine an intermediate frequency domain metric value corresponding to the antenna; The frequency domain metric value corresponding to the candidate DMRS is determined according to the intermediate frequency domain metric value corresponding to each of the antennas. 6. The method according to claim 5, wherein the determining the frequency domain metric value corresponding to the candidate DMRS according to the intermediate frequency domain metric value corresponding to each of the antennas comprises: obtaining the respective coefficients corresponding to each of the antennas; The frequency domain metric value corresponding to the candidate DMRS is determined according to the intermediate frequency domain metric values corresponding to the respective antennas and the respective coefficients corresponding to the respective antennas. 7. The method according to any one of claims 1 to 6, wherein the determining a target DMRS in the respective DMRSs according to the frequency domain metric values corresponding to the respective DMRSs comprises: The DMRS with the smallest frequency domain metric value is determined as the target DMRS. 8. An apparatus for detecting a beam index, wherein the apparatus comprises: The channel estimation module is used to obtain the channel estimation result of the SSS according to the known SSS sequence of the secondary synchronization signal and the received SSS sequence; wherein, the known SSS sequence is the SSS sequence pre-existing locally in the terminal, and the received SSS sequence refers to the the SSS sequence received by the terminal; A metric value determination module, configured to determine frequency domain metric values corresponding to each candidate demodulation reference signal DMRS according to the channel estimation result of the SSS, where the frequency domain metric value is used to quantify the difference between the received sequence and the reconstructed sequence degree, the reconstruction sequence is determined based on the channel estimation result of the SSS and the candidate DMRS; a target DMRS determination module, configured to determine a target DMRS in each of the DMRSs according to the frequency domain metric values corresponding to the respective DMRSs; The beam index detection module is configured to determine the beam index corresponding to the target DMRS as the target beam index. 9. A terminal, characterized in that the terminal comprises a processor and a memory, the memory stores a computer program, and the computer program is loaded and executed by the processor as described in any one of claims 1 to 7 The method of detecting the beam index. 10. A chip, characterized in that the chip comprises a processor and an interface, the processor obtains program instructions through the interface, and the processor is configured to execute the program instructions to execute the program instructions according to claims 1 to 8 Any one of the methods for detecting a beam index. 11. A computer-readable storage medium, characterized in that, a computer program is stored in the computer-readable storage medium, and the computer program is loaded and executed by a processor to realize any one of claims 1 to 7. The method of detecting the beam index.

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