CN117579109A - NR wave beam searching method and user equipment - Google Patents

NR wave beam searching method and user equipment Download PDF

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Publication number
CN117579109A
CN117579109A CN202311610873.XA CN202311610873A CN117579109A CN 117579109 A CN117579109 A CN 117579109A CN 202311610873 A CN202311610873 A CN 202311610873A CN 117579109 A CN117579109 A CN 117579109A
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pbch
signal
dmrs
ssb
sampling signal
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万能
梁杰
罗森
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Shenzhen Siglent Technologies Co Ltd
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Shenzhen Siglent Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/086—Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A search method and user equipment of NR wave beam adopts PBCH-DMRS sequence search based on frequency domain correlation, avoids interference of transmission signals on unused subcarriers of PBCH-DMRS to correlation operation, improves reliability and accuracy of algorithm, and in addition, on the basis of PBCH-DMRS sequence search based on frequency domain correlation, adopts PBCH-DMRS sequence search based on fast Fourier recurrence, greatly reduces the computation of PBCH-DMRS search based on frequency domain correlation, thereby rapidly determining SSB wave beam number and improving algorithm efficiency.

Description

NR wave beam searching method and user equipment
Technical Field
The present application relates to the field of wireless communications technologies, and in particular, to a method for searching NR beams and a user equipment.
Background
In order to improve the channel utilization efficiency and the coverage area of a base station, the NR protocol introduces a beam forming technology, and adopts a space division multiplexing mode to realize mobile communication. The NR protocol is based on an OFDM modulation technique, which provides for data transmission in units of radio signal frames (frames) in the time domain, each radio signal Frame being fixed to have a length of 10ms. Before NR communication, the user equipment based on NR protocol needs to complete physical cell search and synchronization to obtain the initial frame time of radio signal to realize the time synchronization of transceiver.
The synchronization signal blocks (Synchronization Signal Block, SSB) for physical cell synchronization also employ beamforming techniques to time-share different beams in different directions for broadcast, as specified by the NR protocol. Section 3GPP TS 38.213 4.1 of the protocol specifies that under a particular SSB broadcast pattern, each SSB beam is transmitted at a fixed time domain location of a radio signal frame.
Section 3GPP TS 38.211 7.4.3 provides for transmitting a primary synchronization signal sequence (Primary Synchronization Signal, PSS), a secondary synchronization signal sequence (Secondary Synchronization Signal, SSS) and a physical broadcast channel (Physical Broadcast Channel, PBCH) within each SSB beam according to the same channel resource mapping rule, the PBCH comprising a data portion carrying a primary message block (Main Information Block, MIB) and a demodulation reference signal (Demodulation Reference Signal, DMRS) portion. In different SSB beams sent in the same radio signal frame, the PSS, SSS, PBCH transmission signals are identical, and only the PBCH-DMRS carries SSB beam number information.
When the user equipment performs cell synchronization, firstly, performing correlation search on PSS to determine the time domain position where SSB is located, then performing correlation search on PBCH-DMRS sequence to determine the number of SSB wave beam currently detected, thereby determining the position of wireless signal frame head, and performing wireless signal frame synchronization. When the PBCH-DMRS sequence is subjected to correlation search, as the PBCH-DMRS occupies discrete subcarriers on an OFDM symbol where the PBCH-DMRS is located, direct correlation operation is performed on a time domain and is interfered by other signals on the unused subcarriers; however, in order to avoid interference, a correlation operation in a frequency domain is used, so that a large number of FFT operations are often introduced, resulting in a reduction in processing speed.
In summary, there is a need for a method for accurately searching the PBCH-DMRS sequence to detect SSB beam numbers.
Disclosure of Invention
The technical problem that this application mainly solves is how to search for PBCH-DMRS sequence in NR signal accurately.
According to a first aspect, in one embodiment, there is provided a method for searching for an NR beam, including:
receiving an NR signal sent by a base station, and intercepting a signal with a first time length from the received NR signal as a first sampling signal; wherein the first time length includes at least one wireless signal frame length;
searching the PSS in the first sampling signal, and calculating the delay position of the SSB wave beam where the PSS is positioned in the first sampling signal according to the delay position of the searched PSS in the first sampling signal;
according to the delay positions of the SSB beams where the PSS is located in the first sampling signals, determining ideal delay positions of the SSB beams, and selecting one of the ideal delay positions of the SSB beams as a first ideal delay position of the SSB beams;
searching an SSS sequence in the first sampling signal according to a delay position of the SSS specified by a preset protocol, and determining a physical cell identifier corresponding to the base station according to the searched PSS sequence and the SSS sequence; generating a PBCH-DMRS frequency domain reference signal of an SSB wave beam according to the physical cell identifier;
according to the delay position of the PSS in the first sampling signal, calculating the 1 st OFDM symbol position in the SSB wave beam where the PSS is located, taking the 1 st OFDM symbol position as the center, and intercepting a signal with a second time length from the first sampling signal as a second sampling signal; wherein, the numbering of the OFDM symbols is started from 0, and the second time length is greater than the length of one OFDM symbol, and the part of the second time length exceeding the length of one OFDM symbol searches the time domain range for the PBCH-DMRS;
in a second sampling signal, performing correlation calculation based on a frequency domain by utilizing the PBCH-DMRS reference frequency domain signal to obtain a delay position of an effective PBCH-DMRS sequence in the second sampling signal;
and determining the SSB beam number according to the delay position of the searched effective PBCH-DMRS sequence.
According to a second aspect, in one embodiment there is provided a user equipment comprising:
the sampling unit is used for receiving an NR signal sent by the base station and intercepting a signal with a first time length from the received NR signal as a first sampling signal; wherein the first time length includes at least one wireless signal frame length;
the SSB searching unit is used for searching the PSS in the first sampling signal and calculating the delay position of the SSB wave beam where the PSS is positioned in the first sampling signal according to the delay position of the searched PSS in the first sampling signal;
an SSB beam ideal delay position obtaining unit, configured to determine ideal delay positions of a plurality of SSB beams according to delay positions of the SSB beam in which the PSS is located in the first sampling signal, and select one of the ideal delay positions of the SSB beams as a first ideal delay position of the SSB beam;
the PBCH-DMRS frequency domain reference signal generating unit is used for searching an SSS sequence in the first sampling signal according to the delay position of the SSS specified by a preset protocol, and determining a physical cell identifier corresponding to the base station according to the searched PSS sequence and the SSS sequence; generating a PBCH-DMRS frequency domain reference signal of an SSB wave beam according to the physical cell identifier;
the intercepting unit is used for calculating the 1 st OFDM symbol position in the SSB wave beam where the PSS is positioned according to the delay position of the PSS in the first sampling signal, and intercepting a signal with a second time length from the first sampling signal as a second sampling signal by taking the 1 st OFDM symbol position as a center; wherein, the numbering of the OFDM symbols is started from 0, and the second time length is greater than the length of one OFDM symbol, and the part of the second time length exceeding the length of one OFDM symbol searches the time domain range for the PBCH-DMRS;
the searching unit is used for carrying out correlation calculation based on a frequency domain by utilizing the PBCH-DMRS reference frequency domain signal in a second sampling signal to obtain a delay position of an effective PBCH-DMRS sequence in the second sampling signal;
and the SSB beam number determining unit is used for determining the SSB beam number according to the delay position of the searched effective PBCH-DMRS sequence.
According to the NR wave beam searching method and the user equipment, as the PBCH-DMRS sequence searching based on the frequency domain correlation is adopted, interference of transmission signals on unused subcarriers of the PBCH-DMRS on correlation operation is avoided, the reliability and the accuracy of an algorithm are improved, and in addition, on the basis of the PBCH-DMRS sequence searching based on the frequency domain correlation, the PBCH-DMRS sequence searching based on the fast Fourier recurrence is adopted, so that the computation amount of the PBCH-DMRS searching based on the frequency domain correlation is greatly reduced, SSB wave beam numbers are rapidly determined, and the algorithm efficiency is improved.
Drawings
FIG. 1 is a flow chart of a search method of NR beams of one embodiment;
fig. 2 is a block diagram of a user device of an embodiment.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings by way of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, some operations associated with the present application have not been shown or described in the specification to avoid obscuring the core portions of the present application, and may not be necessary for a person skilled in the art to describe in detail the relevant operations based on the description herein and the general knowledge of one skilled in the art.
Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated.
The following is a description of the english abbreviations referred to in this application.
SSB (Synchronization Signal Block) the synchronization signal block;
PBCH (Physical Broadcast Channel) denotes a physical broadcast channel;
DMRS (Demodulation Reference Signal) the demodulation reference signal and PBCH-DMRS the demodulation reference signal in the physical broadcast channel;
PSS (primary synchronization signal) the primary synchronization signal;
SSS (secondary synchronization signal) the secondary synchronization signal;
PCI (physical cell identifier) the physical cell identity.
Referring to fig. 1, an embodiment of the present application provides a method for searching an NR beam, where the method for searching an NR beam may include steps 101 to 107, which are described in detail below.
Step 101: receiving an NR signal sent by a base station, and intercepting a signal with a first time length from the received NR signal as a first sampling signal; wherein the first time length includes at least one wireless signal frame length.
The structure of the NR channel time domain resource is regulated according to the protocol 3GPP TS 38.211 4.3 section, the channel resource is divided according to the form of radio frames, and each radio frame occupies 10ms fixedly. Also, the protocol 3GPP TS 38.213 4.1 section further provides for the user equipment to conduct a cell search based on the synchronization signal, for PSS, SSS, PBCH to be transmitted in SSB form, and for SSB to be transmitted on fixed time-frequency domain resources within the radio frame in accordance with a particular broadcast pattern (the channel resources to be used in particular depend on the SSB broadcast pattern).
In this embodiment, in order to determine the position of the start time of the radio frame in the sampled data of the received signal, after sampling the NR signal received by the receiving antenna according to the sampling rate specified by the protocol, a plurality of radio frame time lengths are intercepted, so as to ensure that PSS and SSS can be searched during subsequent analysis. The present embodiment may consider a default SSB broadcast period of 20ms specified in section 3GPP TS 38.211 4.1 of the default intercept length setting protocol.
Step 102: and searching the PSS in the first sampling signal, and calculating the delay position of the SSB wave beam where the PSS is positioned in the first sampling signal according to the delay position of the searched PSS in the first sampling signal.
Step 103: and determining ideal delay positions of the SSB beams according to the delay positions of the SSB beams where the PSS is positioned in the first sampling signal, and selecting one of the ideal delay positions of the SSB beams as a first ideal delay position of the SSB beams for subsequent calculation.
Step 104: searching an SSS sequence in a first sampling signal according to a delay position of the SSS specified by a preset protocol, and determining a physical cell identifier corresponding to a base station according to the searched PSS sequence and the SSS sequence; and generating the PBCH-DMRS frequency domain reference signal of the SSB wave beam according to the physical cell identification. The preset protocol is protocol 3GPP TS 38.211 7.4.2.1.
According to protocol 3GPP TS 38.211 7.4.2.1 section, the PSS transmitted by each SSB beam is identical to the SSS sequence and is determined only by the PCI. Since the PSS and SSS use only 127 subcarriers in the SSB bandwidth center for transmission, in order to avoid interference of other channels when searching for the synchronization signal, the radio frame truncated data is digitally mixed in advance according to the frequency domain position where the SSB is located, the SSB is mixed to the bandwidth center (baseband zero frequency), and then low-pass filtering (hereinafter referred to as synchronous filtering) is performed to filter other signals except for the subcarriers used for the synchronization signal.
When the user equipment does not know the PCI in advance, the PCI needs to be judged according to the PSS and SSS search results. Protocol 3GPP TS 38.211 7.4.2.1 section specifies the PCI value range [0, 1007 ]]The physical cell identification range is divided into 336 groupsSurrounding wallIs [0, 335 ]]Within each group is marked +.>In the range of [0,2]The physical cell identity may be expressed as:
according to protocol 3GPP TS 38.211 7.4.2.1 section, the PSS sequence is defined only byThree possible PSS sequences are determined to exist. The receiving antenna maps three possible PSS sequences to the center of a transmission bandwidth according to a PSS channel mapping mode specified by a protocol, and generates a PSS reference time domain signal through OFDM modulation.
The PSS is then searched for in the truncated first sampled signal by means of time-domain correlation. The receiving antenna takes at least half of the radio frame length of the sampled data from the synchronously filtered first sampled signal as s pss (N) the length of which is denoted as L+N, and the PSS reference time domain signal is denoted as r pss (N) the length of which is the OFDM symbol length N corresponding to the sampling rate of the first sampling signal, and the PSS correlation coefficient delayed by d sampling periods is shown in the following expression, wherein r * pss (k) Represents r pss (k) Is conjugated with:
deriving a correlation coefficient R for reference signals generated for each PSS sequence PSS (d) Delay value d with maximum value pss If the correlation coefficient R PSS (d pss ) And if the PSS sequence is larger than the preset correlation coefficient threshold value, judging that the corresponding PSS sequence is searched. Determining according to PSS sequence with maximum correlation coefficient value obtained in PSS searching processAnd PSS delay position d pss 。
In order to improve the operation efficiency of the PSS search, it is generally considered to downsample the truncated data for the PSS search with the PSS reference time domain, so as to reduce the operation amount of the PSS search.
After PSS search has been determinedLater, for further acquisition->Discrimination by SSS search is required. Based on->There are 336 possibilities for the SSS sequence, 336 SSS reference time domain signals can be generated in a PSS-like method for SSS search.
According to protocol 3GPP TS 38.211 7.4.3 section, the relative delay of SSS within the same SSB with respect to PSS is fixed to 2 OFDM symbol lengths with cyclic prefix, so that the acquired PSS delay position d can be used pss And taking the calculated SSS delay position as a center, intercepting sampling data with a certain length from the sampling data after digital mixing and synchronous filtering, and performing SSS related search by using a PSS searching similar method.
Since the protocol specifies that the time domain position of the SSS always falls behind the PSS, when the SSS sampling data is intercepted, the calculated delay position may exceed the length of the intercepted signal, and backward exceeds the sampling termination point; in this case, the synchronization signal is periodically transmitted at a fixed time domain position in the radio frame, and it is considered that the excess portion is searched backward from the start of the first sampling signal for the SSS time domain position. The precondition for performing the above operation is that the truncated data length is an integer multiple of the radio frame length.
Based on the SSS sequence with maximum correlation coefficient value obtained during SSS search, determiningWhereby the search for PSS is combined>PCI can be calculated according to the formula (2).
After the PCI is acquired, generating a PBCH-DMRS sequence of each SSB wave beam according to a protocol 3GPP TS 38.211 7.4.1.4.1 section; and then generating PBCH-DMRS frequency domain reference signals of each SSB wave beam according to a subcarrier mapping mode specified in the section 3GPP TS 38.211 7.4.3 of the protocol.
Wherein all 240 subcarriers on the 1 st OFDM symbol in SSB are used for transmitting PBCH, and wherein every 4 consecutive subcarriers are allocated 1 subcarrier for transmitting PBCH-DMRS, PBCH-DMRS subcarriers are equally distributed, SSB subcarriers are counted from 0 from low frequency, and the number of the first subcarrier allocated to PBCH-DMRS is determined by PCI, according to the rules of protocol 3GPP TS 38.211 7.4.3. Wherein OFDM symbols are numbered starting from 0.
Step 105: according to the delay position of the PSS in the first sampling signal, calculating the 1 st OFDM symbol position in the SSB wave beam where the PSS is located, taking the 1 st OFDM symbol position as the center, and intercepting a signal with a second time length from the first sampling signal as a second sampling signal; wherein the numbering of the OFDM symbols is started from 0, and the second time length is greater than the length of one OFDM symbol, and the part of the second time length exceeding the length of one OFDM symbol is the PBCH-DMRS searching time domain range.
In this embodiment, according to the rules of the protocol 3GPP TS 38.211 7.4.3 section, the 1 st OFDM symbol position of the SSB where the PSS is searched is intercepted to obtain the sampling signal data with a certain length as the second sampling signal, and the PBCH-DMRS reference sequence of each SSB beam number is sequentially searched in the second sampling signal.
Step 106: and in the second sampling signal, performing correlation calculation based on a frequency domain by using the PBCH-DMRS reference frequency domain signal to obtain a delay position of an effective PBCH-DMRS sequence in the second sampling signal.
In some embodiments, in the second sampling signal, performing a correlation calculation based on a frequency domain by using the PBCH-DMRS reference frequency domain signal, and obtaining a delay position of the effective PBCH-DMRS sequence in the second sampling signal includes:
(1) And performing correlation calculation on each position point of the second sampling signal and the PBCH-DMRS reference frequency domain signal in a second time length by adopting a fast Fourier recursive algorithm to obtain a correlation coefficient of each position point.
(2) And taking the position point corresponding to the maximum value of the correlation coefficient corresponding to each position point as the delay position of the effective PBCH-DMRS sequence in the second sampling signal. Wherein the correlation coefficient of the d-th position point is obtained according to the following expression:
wherein S (k, d) represents subcarrier data of the second sampling signal converted to the frequency domain, k represents subcarrier numbers, d represents delay positions, d is more than or equal to 0 and less than or equal to L ', and L' represents a difference value between the time length of the second sampling signal and the time length of the PBCH-DMRS reference frequency domain signal;representing the PBCH-DMRS reference frequency domain signal corresponding to SSB beam number i,representation->Conjugation of (2);
wherein S (k, d) is recursively derived from the following expression:
wherein the initial value S (k, 0) is S dmrs (i) Performing M-point fast Fourier transform to obtain s dmrs (d) Represents the delay d pointA two-sample signal, i=0, 1..m-1, M is the length of the PBCH-DMRS reference frequency domain signal, s dmrs (M+d) represents sample point data at the delay (M+d) point in the second sample signal.
In an embodiment, taking the position point corresponding to the maximum value of the correlation coefficient corresponding to each position point as the delay position of the effective PBCH-DMRS sequence in the second sampling signal, further includes: if the maximum value of the correlation coefficient is greater than the preset correlation coefficient threshold value, the PBCH-DMRS sequence in the second sampling signal is an effective PBCH-DMRS sequence.
Step 107: and determining the SSB beam number according to the delay position of the searched effective PBCH-DMRS sequence. Wherein:
if one and only one effective PBCH-DMRS sequence is searched, taking an SSB beam number corresponding to the searched effective PBCH-DMRS sequence as a current SSB beam number, and completing the search; if the searched effective PBCH-DMRS sequences are a plurality of or not searched effective PBCH-DMRS sequences, SSB wave beam searching fails and searching needs to be carried out again.
Compared with a PBCH-DMRS sequence searching scheme based on time domain correlation, the NR wave beam searching method provided by the embodiment of the application avoids interference of transmission signals on unused subcarriers of the PBCH-DMRS on correlation operation, and has higher reliability and accuracy; in addition, compared with an unmodified PBCH-DMRS sequence searching scheme based on frequency domain correlation, the method and the device remarkably reduce the operation amount required by PBCH-DMRS sequence searching and have lower resource consumption.
Referring to fig. 2, the present application further provides a user equipment, where the user equipment includes: a sampling unit 201, an SSB search unit 202, an SSB beam ideal delay position acquisition unit 203, a PBCH-DMRS frequency domain reference signal generation unit 204, an interception unit 205, a search unit 206, and an SSB beam number determination unit 207.
The sampling unit 201 is configured to receive an NR signal sent by a base station, and intercept a signal with a first time length from the received NR signal as a first sampling signal; wherein the first time length includes at least one wireless signal frame length.
The SSB search unit 202 is configured to search for the PSS in the first sampled signal, and calculate, according to the delay position of the PSS in the first sampled signal, the delay position of the SSB beam where the PSS is located in the first sampled signal.
The SSB beam ideal delay position obtaining unit 203 is configured to determine ideal delay positions of the SSB beams according to delay positions of the SSB beam in which the PSS is located in the first sampling signal, and select one of the ideal delay positions of the SSB beams as the first ideal delay position of the SSB beam.
The PBCH-DMRS frequency domain reference signal generating unit 204 is configured to search for an SSS sequence in the first sampling signal according to a delay position of the SSS specified by a preset protocol, and determine a physical cell identifier corresponding to the base station according to the searched PSS sequence and SSS sequence; and generating the PBCH-DMRS frequency domain reference signal of the SSB wave beam according to the physical cell identification.
The intercepting unit 205 is configured to calculate a 1 st OFDM symbol position in the SSB beam where the PSS is located according to a delay position of the PSS in the first sampling signal, and intercept a signal with a second time length in the first sampling signal as a second sampling signal with the 1 st OFDM symbol position as a center; the number of the OFDM symbols is numbered from 0, and the second time length is greater than the length of one OFDM symbol, and the part of the second time length exceeding the length of one OFDM symbol is the PBCH-DMRS searching time domain range.
The search unit 206 is configured to perform correlation calculation based on a frequency domain by using the PBCH-DMRS reference frequency domain signal in the second sampling signal, so as to obtain a delay position of the effective PBCH-DMRS sequence in the second sampling signal.
The SSB beam number determining unit 207 is configured to determine an SSB beam number according to the delay position of the searched valid PBCH-DMRS sequence.
It should be noted that each functional unit of the user equipment corresponds to a method step in the above embodiment, and a description thereof will not be repeated here.
Those skilled in the art will appreciate that all or part of the functions of the various methods in the above embodiments may be implemented by hardware, or may be implemented by a computer program. When all or part of the functions in the above embodiments are implemented by means of a computer program, the program may be stored in a computer readable storage medium, and the storage medium may include: read-only memory, random access memory, magnetic disk, optical disk, hard disk, etc., and the program is executed by a computer to realize the above-mentioned functions. For example, the program is stored in the memory of the device, and when the program in the memory is executed by the processor, all or part of the functions described above can be realized. In addition, when all or part of the functions in the above embodiments are implemented by means of a computer program, the program may be stored in a storage medium such as a server, another computer, a magnetic disk, an optical disk, a flash disk, or a removable hard disk, and the program in the above embodiments may be implemented by downloading or copying the program into a memory of a local device or updating a version of a system of the local device, and when the program in the memory is executed by a processor.
The foregoing description of specific examples has been presented only to aid in the understanding of the present application and is not intended to limit the present application. Several simple deductions, modifications or substitutions may also be made by the person skilled in the art to which the present application pertains, according to the idea of the present application.

Claims (10)

1. A method for searching for NR beams, comprising:
receiving an NR signal sent by a base station, and intercepting a signal with a first time length from the received NR signal as a first sampling signal; wherein the first time length includes at least one wireless signal frame length;
searching the PSS in the first sampling signal, and calculating the delay position of the SSB wave beam where the PSS is positioned in the first sampling signal according to the delay position of the searched PSS in the first sampling signal;
according to the delay positions of the SSB beams where the PSS is located in the first sampling signals, determining ideal delay positions of the SSB beams, and selecting one of the ideal delay positions of the SSB beams as a first ideal delay position of the SSB beams;
searching an SSS sequence in the first sampling signal according to a delay position of the SSS specified by a preset protocol, and determining a physical cell identifier corresponding to the base station according to the searched PSS sequence and the SSS sequence; generating a PBCH-DMRS frequency domain reference signal of an SSB wave beam according to the physical cell identifier;
according to the delay position of the PSS in the first sampling signal, calculating the 1 st OFDM symbol position in the SSB wave beam where the PSS is located, taking the 1 st OFDM symbol position as the center, and intercepting a signal with a second time length from the first sampling signal as a second sampling signal; wherein, the numbering of the OFDM symbols is started from 0, and the second time length is greater than the length of one OFDM symbol, and the part of the second time length exceeding the length of one OFDM symbol searches the time domain range for the PBCH-DMRS;
in a second sampling signal, performing correlation calculation based on a frequency domain by utilizing the PBCH-DMRS reference frequency domain signal to obtain a delay position of an effective PBCH-DMRS sequence in the second sampling signal;
and determining the SSB beam number according to the delay position of the searched effective PBCH-DMRS sequence.
2. The method of claim 1, wherein the performing frequency-domain based correlation calculations in the second sampled signal using the PBCH-DMRS reference frequency domain signal to obtain delay positions of the valid PBCH-DMRS sequence in the second sampled signal comprises:
performing correlation calculation on each position point of the second sampling signal and the PBCH-DMRS reference frequency domain signal in a second time length by adopting a fast Fourier recursive algorithm to obtain a correlation coefficient of each position point;
and taking the position point corresponding to the maximum value of the correlation coefficient corresponding to each position point as the delay position of the effective PBCH-DMRS sequence in the second sampling signal.
3. The method of claim 2, wherein performing correlation computation on each location point of the second sampled signal and the PBCH-DMRS reference frequency domain signal in a second time length by using a fast fourier recursive algorithm to obtain a correlation coefficient of each location point comprises:
the correlation coefficient of the d-th position point is obtained according to the following expression:
wherein S (k, d) represents subcarrier data of the second sampling signal converted to the frequency domain, k represents subcarrier numbers, d represents delay positions, d is more than or equal to 0 and less than or equal to L ', and L' represents a difference value between the time length of the second sampling signal and the time length of the PBCH-DMRS reference frequency domain signal;representing the PBCH-DMRS reference frequency domain signal corresponding to SSB beam number i, +.>Representation->Conjugation of (2);
wherein S (k, d) is recursively derived from the following expression:
wherein the initial value S (k, 0) is obtained by performing M-point fast fourier transform on sdmrs (i), sdmrs (d) represents a second sampling signal of a delay d point, i=0, 1 dmrs (M+d) represents sample point data at the delay (M+d) point in the second sample signal.
4. The method of claim 2, wherein the taking the location point corresponding to the maximum value of the correlation coefficient corresponding to each location point as the delay position of the valid PBCH-DMRS sequence in the second sampled signal further comprises:
and if the maximum value of the correlation coefficient is greater than a preset correlation coefficient threshold value, the PBCH-DMRS sequence in the second sampling signal is an effective PBCH-DMRS sequence.
5. The method of claim 1 or 4, wherein the determining the SSB beam number based on the delay position of the searched valid PBCH-DMRS sequence comprises:
if one and only one effective PBCH-DMRS sequence is searched, taking the SSB beam number corresponding to the searched effective PBCH-DMRS sequence as the current SSB beam number;
if the searched effective PBCH-DMRS sequence is a plurality of or unsearched effective PBCH-DMRS sequences, SSB wave beam searching fails.
6. A user device, comprising:
the sampling unit is used for receiving an NR signal sent by the base station and intercepting a signal with a first time length from the received NR signal as a first sampling signal; wherein the first time length includes at least one wireless signal frame length;
the SSB searching unit is used for searching the PSS in the first sampling signal and calculating the delay position of the SSB wave beam where the PSS is positioned in the first sampling signal according to the delay position of the searched PSS in the first sampling signal;
an SSB beam ideal delay position obtaining unit, configured to determine ideal delay positions of a plurality of SSB beams according to delay positions of the SSB beam in which the PSS is located in the first sampling signal, and select one of the ideal delay positions of the SSB beams as a first ideal delay position of the SSB beam;
the PBCH-DMRS frequency domain reference signal generating unit is used for searching an SSS sequence in the first sampling signal according to the delay position of the SSS specified by a preset protocol, and determining a physical cell identifier corresponding to the base station according to the searched PSS sequence and the SSS sequence; generating a PBCH-DMRS frequency domain reference signal of an SSB wave beam according to the physical cell identifier;
the intercepting unit is used for calculating the 1 st OFDM symbol position in the SSB wave beam where the PSS is positioned according to the delay position of the PSS in the first sampling signal, and intercepting a signal with a second time length from the first sampling signal as a second sampling signal by taking the 1 st OFDM symbol position as a center; wherein, the numbering of the OFDM symbols is started from 0, and the second time length is greater than the length of one OFDM symbol, and the part of the second time length exceeding the length of one OFDM symbol searches the time domain range for the PBCH-DMRS;
the searching unit is used for carrying out correlation calculation based on a frequency domain by utilizing the PBCH-DMRS reference frequency domain signal in a second sampling signal to obtain a delay position of an effective PBCH-DMRS sequence in the second sampling signal;
and the SSB beam number determining unit is used for determining the SSB beam number according to the delay position of the searched effective PBCH-DMRS sequence.
7. The user equipment of claim 6, wherein in the second sampling signal, performing frequency-domain-based correlation calculation using the PBCH-DMRS reference frequency domain signal, and obtaining the delay position of the effective PBCH-DMRS sequence in the second sampling signal comprises:
performing correlation calculation on each position point of the second sampling signal and the PBCH-DMRS reference frequency domain signal in a second time length by adopting a fast Fourier recursive algorithm to obtain a correlation coefficient of each position point;
and taking the position point corresponding to the maximum value of the correlation coefficient corresponding to each position point as the delay position of the effective PBCH-DMRS sequence in the second sampling signal.
8. The user equipment of claim 7 wherein performing correlation calculation on each location point of the second sampled signal and the PBCH-DMRS reference frequency domain signal in a second time length by using a fast fourier recursive algorithm to obtain a correlation coefficient of each location point comprises:
the correlation coefficient of the d-th position point is obtained according to the following expression:
wherein S (k, d) represents subcarrier data of the second sampling signal converted to the frequency domain, k represents subcarrier numbers, d represents delay positions, d is more than or equal to 0 and less than or equal to L ', and L' represents a difference value between the time length of the second sampling signal and the time length of the PBCH-DMRS reference frequency domain signal;representing the PBCH-DMRS reference frequency domain signal corresponding to SSB beam number i, +.>Representation->Conjugation of (2);
wherein S (k, d) is recursively derived from the following expression:
wherein the initial value S (k, 0) is obtained by performing M-point fast fourier transform on sdmrs (i), sdmrs (d) represents a second sampling signal of a delay d point, i=0, 1 dmrs (M+d) represents sample point data at the delay (M+d) point in the second sample signal.
9. The ue of claim 7, wherein the taking the location point corresponding to the maximum value of the correlation coefficient corresponding to each location point as the delay position of the valid PBCH-DMRS sequence in the second sampled signal further comprises:
and if the maximum value of the correlation coefficient is greater than a preset correlation coefficient threshold value, the PBCH-DMRS sequence in the second sampling signal is an effective PBCH-DMRS sequence.
10. The user equipment of claim 6 or 9, wherein the determining the SSB beam number according to the delay position of the searched valid PBCH-DMRS sequence comprises:
if one and only one effective PBCH-DMRS sequence is searched, taking the SSB beam number corresponding to the effective PBCH-DMRS sequence as the current SSB beam number;
if the searched effective PBCH-DMRS sequence is a plurality of or unsearched effective PBCH-DMRS sequences, SSB wave beam searching fails.
CN202311610873.XA 2023-11-28 2023-11-28 NR wave beam searching method and user equipment Pending CN117579109A (en)

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