CN112187330B

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

Info

Publication number: CN112187330B
Application number: CN202011098129.2A
Authority: CN
Inventors: 刘君
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-10-14
Filing date: 2020-10-14
Publication date: 2022-09-23
Anticipated expiration: 2040-10-14
Also published as: CN112187330A

Abstract

The embodiment of the application provides a method, a device, a terminal and a storage medium for detecting beam indexes. The method comprises the following steps: acquiring a channel estimation result of the SSS according to the known SSS sequence and the received SSS sequence; determining frequency domain metric values corresponding to the candidate DMRSs according to a channel estimation result of the SSS, wherein the frequency domain metric values are used for quantizing the difference degree between a receiving sequence and a reconstruction sequence, and the reconstruction sequence is determined based on the channel estimation result of the SSS and the candidate DMRSs; determining a target DMRS in each DMRS according to the frequency domain measurement value corresponding to each DMRS; and determining a beam index corresponding to the target DMRS as a target beam index. The technical scheme provided by the embodiment of the application can reduce the calculation amount of 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 embodiment of the application relates to the technical field of wireless communication, in particular to a method, a device, a terminal and a storage medium for detecting a beam index.

Background

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

Since the following is specified in the 3rd Generation Partnership Project (3 GPP) protocol: since the scrambling sequence of the DMRS changes with the change of the L transmission beams on the base station side, the terminal needs to detect the corresponding beam index in the L beams and can perform channel estimation based on the corresponding DMRS sequence.

Disclosure of Invention

The embodiment of the application provides a method, a device, a terminal and a storage medium for detecting beam indexes. The technical scheme is as follows:

in one aspect, an embodiment of the present application provides a method for detecting a beam index, where the method includes:

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

determining frequency domain metric values respectively corresponding to candidate demodulation reference signals (DMRS) according to a channel estimation result of the SSS, wherein the frequency domain metric values are used for quantizing the difference degree between a receiving sequence and a reconstruction sequence, and the reconstruction sequence is determined based on the channel estimation result of the SSS and the candidate DMRS;

determining a target DMRS in each DMRS according to the frequency domain measurement values respectively corresponding to the DMRS;

and determining the beam index corresponding to the target DMRS as a target beam index.

In another aspect, an embodiment of the present application provides an apparatus for detecting a beam index, where the apparatus includes:

a channel estimation module, configured to obtain a channel estimation result of an SSS according to a known secondary synchronization signal SSS sequence and a received SSS sequence;

a metric value determining module, configured to determine frequency domain metric values corresponding to respective candidate demodulation reference signals, DMRSs, according to a channel estimation result of the SSS, where the frequency domain metric values are used to quantize a difference degree between a received sequence and a reconstructed sequence, and the reconstructed sequence is determined based on the channel estimation result of the SSS and the candidate DMRSs;

the target DMRS determining module is used for determining a target DMRS in each DMRS according to the frequency domain metric values respectively corresponding to the DMRS;

and the beam index detection module is used for determining the beam index corresponding to the target DMRS as a target beam index.

In yet another aspect, embodiments of the present application provide a terminal, which 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 beam index according to an aspect.

In yet another aspect, the present application provides a computer-readable storage medium, in which a computer program is stored, the computer program being loaded and executed by a processor to implement the method for detecting a beam index according to an aspect.

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

In yet another aspect, embodiments of the present application provide a computer program product, the computer program product or computer program including 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 to cause the computer device to perform the method of detecting the beam index described above.

The technical scheme provided by the embodiment of the application can bring the beneficial effects of at least comprising:

the method comprises the steps of obtaining a reconstruction sequence through the prior information of a channel estimation result of SSS and various candidate DMRS sequences, then obtaining the difference degree between the reconstruction sequence and a receiving sequence, determining the DMRS sequence with the minimum difference degree as a required DMRS sequence, and then determining a beam index based on the determined DMRS sequence, so that the calculation amount of determining the beam index is reduced, the complexity is reduced, and the efficiency of determining the beam index is improved.

Drawings

FIG. 1 is a schematic illustration of an implementation environment provided by one embodiment of the present application;

FIG. 2 is an architecture diagram of protocol layers provided by one embodiment of the present application;

fig. 3 is a flowchart of a method for detecting a beam index according to an embodiment of the present application;

fig. 4 is a flowchart of a method for detecting a beam index according to another embodiment of the present application;

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

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

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The following description refers to the related terms related to the embodiments of the present application:

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

DMRS: and the demodulation reference signal is transmitted on a Physical Uplink Control Channel (PUCCH) and an uplink physical shared channel (PUSCH) and is used for the relevant demodulation of uplink control and data channels.

Beam index: the index provides a pointer to the beam, which refers to the shape on the surface of the earth formed by the electromagnetic waves emitted by the satellite antenna. The beam here refers mainly to the shaped beam.

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

Referring to fig. 1, a schematic diagram of an implementation environment provided by an embodiment of the application is shown. 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 comprises a terminal 11 and an access network device 12.

The terminal 11 may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem having a wireless communication function, as well as various forms of terminals (UE), Mobile Stations (MS), terminal devices (terminal device), and the like. For convenience of description, the above-mentioned devices are collectively referred to as a terminal.

Access network device 12 may be a Base Station (BS), which is a device deployed in a wireless access network to provide wireless communication functions for terminals. The base stations may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems using different radio access technologies, the names of devices that function as base stations may differ. In the embodiment of the present application, the above-mentioned device providing a wireless communication function for a terminal is collectively referred to as an access network device.

Access network device 12 and terminal 11 may communicate with each other via some air interface technology, for example, via NR.

In the process of 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 model parameters of a certain channel model to be assumed from received data. In the 5G communication system, since the scrambling sequence of the DMRS changes with the change of the L transmission beams on the base station side, the terminal needs to detect the corresponding beam index in the L beams and can perform channel estimation based on the corresponding DMRS sequence.

Fig. 2 shows a schematic diagram of protocol layers provided by an embodiment of the present application.

The protocol stack comprises a physical layer, a Medium Access Control (MAC) layer, a Radio Link Control (RLC) layer, a Packet Data Convergence Protocol (PDCP) layer, an RRC layer, a non-access stratum (NAS) layer and an 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 and provides a reliable link independent of the radio solution.

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

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

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

The application layer provides an interface between applications on either side of the network, such as remote access and management, email, virtual middleboxes, and directory services, among other functions.

According to the technical scheme provided by the embodiment of the application, the reconstruction sequence is obtained through the prior information of the channel estimation result of the SSS and the candidate DMRS sequences, the difference degree between the reconstruction sequence and the receiving sequence is obtained, the DMRS sequence with the minimum difference degree is determined to be the required DMRS sequence, the beam index is determined based on the determined DMRS sequence, the calculation amount of determining the beam index is reduced, the complexity is reduced, and the efficiency of determining the beam index is improved.

Referring to fig. 3, a method for detecting a beam index according to an embodiment of the present application is shown, where the method is applied to a terminal switch in the embodiment shown in fig. 1, and the method includes:

and 301, acquiring a channel estimation result of the SSS according to the known SSS sequence and the received SSS sequence.

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

Optionally, the channel estimation procedure is represented by the following formula:

H _ls ＝SSS _rx /SSS _local 。

H _ls is the channel estimation result of the SSS, SSS _rx Refers to receiving SSS sequence, SSS _local Is a known SSS sequence.

Step 302, determining frequency domain metric values corresponding to each candidate demodulation reference signal DMRS according to a 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, the frequency domain metric is positively correlated with the degree of difference. That is, the larger the frequency domain metric value is, the larger the difference degree is; the smaller the frequency domain metric value, the smaller the degree of difference.

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

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

And step 303, determining a target DMRS in each DMRS according to the frequency domain metric values respectively corresponding to the DMRSs.

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

And step 304, determining the beam index corresponding to the target DMRS as a target beam index.

Optionally, the terminal prestores a correspondence between the target DMRS and the beam index, and queries the correspondence, to obtain the beam index corresponding to the target DMRS as the target beam index. Table-1 exemplarily shows a correspondence between DMRS and beam index.

TABLE-1

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

And then, the terminal determines a corresponding beam according to the beam index, and further performs channel estimation based on the corresponding DMRS sequence.

In summary, according to the technical scheme provided by the embodiment of the present application, the reconstructed sequence is obtained based on the prior information of the channel estimation result of the SSS and each candidate DMRS sequence, then the difference between the reconstructed sequence and the receiving sequence is obtained, the DMRS sequence with the minimum difference is determined as the required DMRS sequence, and then the beam index is determined based on the determined DMRS sequence, so that the calculation amount for determining the beam index is reduced, the complexity is reduced, and the efficiency for determining the beam index is improved.

How to determine the frequency domain metric values respectively corresponding to the candidate DMRSs according to the channel estimation result of the SSS is explained below. In an alternative 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 a channel estimation result of the SSS to obtain a channel filtering result.

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

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

H _filter ＝filter(H _ls ,coef)；

wherein H _filter Refers to the channel filtering result, filter refers to the filtering algorithm, H _ls Is the channel estimation result and coef refers to the filter coefficient.

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

And the terminal expands the channel filtering result from a frequency domain, and the channel filtering result is respectively expanded by M symmetrically, wherein the value of M is set according to experiments or experiences, such as 1, 2 and the like.

The algorithm used for frequency domain spreading may be interpolation. Illustratively, the frequency domain spreading is represented by the following formula:

H _fit ＝fit(H _filter ,N _tap )。

wherein H _fit Refers to the channel spread result, fit is the interpolation function, H _filter Is the result of channel filtering, N _tap Is the interpolation order.

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

step 302c, obtain the received sequence in the same frequency domain position with SSS and channel spreading result in the specified symbol in the synchronization signal block SSB.

The designation symbol is set in advance. Alternatively, symbols are designated as symbol 1 and symbol 3. The received sequence is denoted S.

And step 302d, determining a frequency domain metric value according to the candidate DMRS, the channel expansion result and the receiving sequence.

And the terminal determines a reconstruction sequence according to the candidate DMRS and the channel expansion result, and then calculates a frequency domain metric value based on the reconstruction sequence and the receiving sequence.

In one possible implementation, the terminal determines a product between the candidate DMRS and the channel extension result; a frequency domain metric is determined based on the product and the received sequence. Illustratively, this implementation is represented by the following formula:

M _l ＝∑|D _l *H _ext -S| ² 。

wherein M is _l Is a frequency domain metric value of a candidate DMRS sequence, D _l Is a candidate DMRS sequence, H _ext As a result of channel spreading, S is the received sequence.

In other possible implementations, a ratio between the received sequence and the candidate DMRS is determined; and determining a frequency domain metric value according to the ratio and the channel expansion result. Illustratively, this implementation is represented by the following formula:

M _l ＝∑|H _ext -S/D _l | ² 。

wherein, M _l Is a frequency domain metric value of a candidate DMRS sequence, D _l Is a candidate DMRS sequence, H _ext As a result of channel spreading, S is the received sequence.

It should be noted that the terminal may have multiple antennas. How to determine the frequency domain metric value corresponding to each candidate DMRS during multi-antenna operation is explained below. In an alternative embodiment provided based on the embodiment shown in fig. 3, step 302 is further implemented as: when a plurality of antennas exist, determining an intermediate frequency domain metric value corresponding to each candidate DMRS; and determining the frequency domain measurement value corresponding to the candidate DMRS according to the intermediate frequency domain measurement value corresponding to each antenna.

The intermediate frequency domain metric values are determined in a manner referred to in steps 302a-302d, but not limited thereto.

Optionally, the terminal determines, according to the intermediate frequency domain metric values respectively corresponding to the antennas, the frequency domain metric value corresponding to the candidate DMRS as: acquiring coefficients corresponding to the antennas respectively; and determining the frequency domain metric value corresponding to the candidate DMRS according to the intermediate frequency domain metric value corresponding to each antenna and the coefficient corresponding to each antenna.

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 a product between the intermediate frequency-domain metric value corresponding to each antenna and the coefficient corresponding to the antenna, and then determines a sum of the 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 root-determined candidate DMRS is expressed by the following formula:

M _l ＝alfa*M _l1 +(1-alfa)*M _l2 。

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

Referring to fig. 4, a flowchart of a method for detecting a beam index according to an embodiment of the present application is shown. The method comprises the following steps:

step 401, obtaining an LS channel estimate for 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.

And the terminal carries out denoising processing on the channel estimation result of the SSS to obtain a channel filtering result.

In step 403, the channel estimation is spread in frequency domain.

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

Step 404, frequency domain receiving sequence extraction.

The terminal acquires a reception sequence.

Step 405, metric value calculation.

And for each candidate DMRS, calculating a frequency domain metric value of the candidate DMRS according to the candidate DMRS, the channel expansion result and the receiving sequence.

In step 406, multiple antennas are combined.

If the terminal has multiple antennas, calculating an intermediate frequency domain metric value corresponding to each antenna for each candidate DMRS, and then determining a 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.

And determining a target DMRS according to the frequency domain metric values corresponding to the candidate DMRSs respectively, and then determining a target beam index according to the target DMRS.

In summary, according to the technical solution provided by the embodiment of the present invention, the reconstructed sequence is obtained based on the prior information of the channel estimation result of the SSS and the candidate DMRS sequences, then the difference between the reconstructed sequence and the receiving sequence is obtained, the DMRS sequence with the minimum difference is determined as the required DMRS sequence, and then the beam index is determined based on the determined DMRS sequence, so that the calculation amount for determining the beam index is reduced, the complexity is reduced, and the efficiency for determining the beam index is improved.

In the following, embodiments of the apparatus of the present application are described, and for portions of the embodiments of the apparatus not described in detail, reference may be made to technical details disclosed in the above-mentioned method embodiments.

Referring to fig. 5, a block diagram of an apparatus for detecting a beam index according to an exemplary embodiment of the present application is shown. The means for detecting the beam index may be implemented by software, hardware, or a combination of both as all or a part of the terminal. The apparatus for detecting a beam index includes:

a channel estimation module 501, configured to obtain a channel estimation result of the SSS according to the SSS sequence and the received SSS sequence.

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

And a target DMRS determining module 503, configured to determine a target DMRS in each DMRS according to the frequency domain metric values corresponding to the DMRSs.

A beam index detection module 504, configured to determine a beam index corresponding to the target DMRS as a target beam index.

In an alternative embodiment provided based on the embodiment shown in fig. 5, the metric value determining module 502 is configured to:

denoising 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;

acquiring a receiving sequence in a specified symbol in a Synchronous Signal Block (SSB) at the same frequency domain position as the SSS and the channel expansion result;

and determining the frequency domain metric value according to the candidate DMRS, the channel expansion result and the receiving sequence.

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

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

determining the frequency domain metric value based on the product and the received sequence.

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

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

and determining the frequency domain metric value according to the ratio and the channel expansion result.

when a plurality of antennas exist, determining an intermediate frequency domain metric value corresponding to each candidate DMRS for the antennas;

and determining the frequency domain metric value corresponding to the candidate DMRS according to the intermediate frequency domain metric value corresponding to each antenna.

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

acquiring coefficients corresponding to the antennas respectively;

and determining the frequency domain metric value corresponding to the candidate DMRS according to the intermediate frequency domain metric value corresponding to each antenna and the coefficient corresponding to each antenna.

In an optional embodiment provided based on the embodiment shown in fig. 5, the target DMRS determining module 503 is configured to determine a DMRS with a 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, according to a correspondence between a beam index and a DMRS, a beam index corresponding to the target DMRS as the target beam index.

It should be noted that, when the apparatus provided in the foregoing embodiment implements the functions thereof, only the division of the functional modules is illustrated, and in practical applications, the functions may be distributed by different functional modules according to needs, that is, the internal structure of the apparatus may be divided into different functional modules to implement all or part of the functions described above. In addition, the apparatus and method embodiments provided by the above embodiments belong to the same concept, and specific implementation processes thereof are described in the method embodiments for details, which are not described herein again.

Fig. 6 is a block diagram of a terminal shown in accordance with an example embodiment.

The terminal 600 comprises a transmitter 601, a receiver 602 and a processor 603. The processor 603 may also be a controller, and is shown 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, the transmitter 601 conditions (e.g., converts to analog, filters, amplifies, and frequency upconverts, etc.) the output samples and generates an uplink signal, which is transmitted via an antenna to the access network equipment described in the embodiments above. On the downlink, the antenna receives the downlink signal transmitted by the access network device in the above embodiment. Receiver 602 conditions (e.g., filters, amplifies, downconverts, and digitizes, etc.) the received signal from the antenna and provides input samples. Within modem processor 605, an encoder 606 receives traffic data and signaling messages to be transmitted on the uplink and processes (e.g., formats, encodes, and interleaves) the traffic data and signaling messages. A modulator 607 further processes (e.g., symbol maps and modulates) the coded traffic data and signaling messages and provides output samples. A demodulator 609 processes (e.g., demodulates) the input samples and provides symbol estimates. A decoder 608 processes (e.g., deinterleaves and decodes) the symbol estimates and provides decoded data and signaling messages for transmission to terminal 600. Encoder 606, modulator 607, demodulator 609, and decoder 608 may be implemented by a combined modem processor 605. These elements are handled according to the radio access technology employed by the radio access network (e.g., the access technology of LTE and other evolved systems). It is to be noted that when terminal 600 does not include modem processor 605, the above-mentioned functions of modem processor 605 can also be performed by processor 603.

In the embodiment of the present application, modem processor 605 controls and manages the operation of terminal 600, and is configured to execute the processing procedure performed by terminal 600 in the embodiment of the present disclosure. Further, the terminal 600 may also include a memory 604, the memory 604 for storing program codes and data for the terminal 600.

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

Alternatively, the 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, a computer program product or computer program is also provided, 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 to cause the computer device to perform the method of detecting the beam index described above.

The above description is only exemplary of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like that are made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method of detecting a beam index, the method comprising:

acquiring a channel estimation result of the SSS according to the known secondary synchronization signal SSS sequence and the received SSS sequence; the known SSS sequence is a pre-stored SSS sequence local to a terminal, and the received SSS sequence is an SSS sequence received by the terminal;

2. The method as claimed in claim 1, wherein the determining frequency-domain metric values corresponding to respective candidate demodulation reference signals DMRS according to a channel estimation result of a secondary synchronization signal SSS comprises:

acquiring a received sequence at the same frequency domain position as the SSS and the channel expansion result in a specified symbol in a Synchronization Signal Block (SSB);

3. The method of claim 2, wherein the determining the frequency domain metric value according to the candidate DMRS, the channel spreading result, and the received sequence comprises:

4. The method of 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;

5. The method of claim 1, wherein determining frequency-domain metric values respectively corresponding to candidate demodulation reference signals (DMRSs) according to a channel estimation result of the SSS comprises:

when a plurality of antennas exist, determining an intermediate frequency domain metric value corresponding to each candidate DMRS for the antenna;

6. The method of claim 5, wherein the determining the frequency domain metric values corresponding to the candidate DMRS according to the intermediate frequency domain metric values corresponding to the respective antennas comprises:

obtaining coefficients corresponding to the antennas respectively;

7. The method according to any one of claims 1 to 6, wherein the determining the target DMRS among the DMRSs according to the frequency domain metric values respectively corresponding to the DMRSs comprises:

and determining the DMRS with the minimum frequency domain metric value as the target DMRS.

8. An apparatus for detecting a beam index, the apparatus comprising:

a channel estimation module, configured to obtain a channel estimation result of an SSS according to a known secondary synchronization signal SSS sequence and a received SSS sequence; the known SSS sequence is a pre-stored SSS sequence local to a terminal, and the received SSS sequence is a SSS sequence received by the terminal;

a metric value determining module, configured to determine, according to a channel estimation result of the SSS, frequency domain metric values corresponding to respective candidate demodulation reference signals DMRS, where the frequency domain metric values are used to quantize a difference degree between a received sequence and a reconstructed sequence, and the reconstructed sequence is determined based on the channel estimation result of the SSS and the candidate DMRS;

9. A terminal, characterized in that the terminal comprises a processor and a memory, the memory storing a computer program which is loaded by the processor and which performs the method of detecting a beam index according to any of claims 1 to 7.

10. A chip comprising a processor and an interface, the processor obtaining program instructions through the interface, the processor being configured to execute the program instructions to perform the method of detecting a beam index according to any one of claims 1 to 8.

11. A computer-readable storage medium, in which a computer program is stored which is loaded and executed by a processor to implement the method of detecting beam indices according to any one of claims 1 to 7.