CN112770385B - Signal transmission method, base station, terminal and computer storage medium - Google Patents

Signal transmission method, base station, terminal and computer storage medium Download PDF

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CN112770385B
CN112770385B CN202011599485.2A CN202011599485A CN112770385B CN 112770385 B CN112770385 B CN 112770385B CN 202011599485 A CN202011599485 A CN 202011599485A CN 112770385 B CN112770385 B CN 112770385B
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papr
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crs
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CN112770385A (en
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刘宁
高珂增
张福恩
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Hytera Communications Corp Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • 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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Abstract

The application provides a signal transmission method, a base station, a terminal and a computer storage medium, wherein the method comprises the following steps: obtaining an SSB; generating a pseudo-random Sequence of the Additional CRS, and then obtaining a first Low peak-to-average power ratio Sequence Low-PAPR Sequence; similarly, generating a second Low-PAPR Sequence of CORESET 0; and generating a first Additional CRS by using the first Low-PAPR Sequence and the second Low-PAPR Sequence, and broadcasting a time domain signal containing the first Additional CRS.

Description

Signal transmission method, base station, terminal and computer storage medium
Technical Field
The present application relates to the field of communication transmission technologies, and in particular, to a signal transmission method, a base station, a terminal, and a computer storage medium.
Background
Currently, in an existing satellite protocol, a base station generates a corresponding time domain Signal for broadcasting by mapping a Synchronization broadcast Block (Synchronization Signal/PBCH Block, SSB), a Control-resource set (CORESET) 0, and an auxiliary cell specific reference Signal (auxiliary CRS) to corresponding frequency domain resources. After receiving the time domain signal corresponding to the Additional CRS, the terminal demodulates the SSB and the CORSEST 0, thereby completing the acquisition of downlink synchronization and system information.
However, in the actual application process, when the lower band boundary of the SSB is located above the lower band boundary of the CORESET0, since the width of a part of the system bandwidth is not known, the original data of the Additional CRS in the area below the lower band boundary of the SSB cannot be known, and therefore, the channel estimation cannot be performed, so that the demodulation of the SSB and the CORESET0 is affected, and the downlink synchronization and the acquisition of the system message cannot be completed.
Disclosure of Invention
In view of the above, the present application provides a signal transmission method, a base station, a terminal, and a computer storage medium, which can perform channel estimation normally when the lower band boundary of the SSB is located above the lower band boundary of the CORESET0, and complete downlink synchronization and acquisition of system messages.
A first aspect of the present application provides a signal transmission method, which is applied to a base station, and the signal transmission method includes:
acquiring a synchronous broadcast block SSB of a base station;
generating a pseudo-random Sequence of an auxiliary cell dedicated reference signal (Additional CRS) in a frequency domain range corresponding to the SSB of the base station, and obtaining a first Low peak-to-average power ratio Sequence (Low-PAPR Sequence) according to the pseudo-random Sequence of the Additional CRS in the frequency domain range corresponding to the SSB of the base station;
generating a pseudo-random Sequence of the Additional CRS in the frequency domain range corresponding to the control resource set CORESET0 of the base station, and obtaining a second Low-PAPR Sequence according to the pseudo-random Sequence of the Additional CRS in the frequency domain range corresponding to the CORESET0 of the base station;
generating a first advanced CRS by using the first Low-PAPR Sequence and the second Low-PAPR Sequence;
broadcasting a time domain signal containing the first Additional CRS.
Optionally, the acquiring the synchronization broadcast block SSB of the base station includes:
generating a primary synchronization signal PSS, a secondary synchronization signal SSS and a physical broadcast channel PBCH;
and mapping the PSS, the SSS and the PBCH according to a satellite NR protocol to obtain the SSB of the base station.
Optionally, the obtaining a first Low peak-to-average power ratio Sequence Low-PAPR Sequence according to a pseudo-random Sequence of an Additional CRS in a frequency domain range corresponding to the SSB of the base station includes:
and performing discrete Fourier transform on a pseudo-random Sequence of the Additional CRS in a frequency domain range corresponding to the SSB of the base station to obtain a first Low peak-to-average power ratio Sequence Low-PAPR Sequence.
Optionally, the obtaining a second Low-PAPR Sequence according to the pseudo-random Sequence of the Additional CRS in the frequency domain range corresponding to the CORESET0 of the base station includes:
and performing discrete Fourier transform on the pseudorandom Sequence of the Additional CRS in the frequency domain range corresponding to the CORESET0 of the base station to obtain a second Low-PAPR Sequence.
Optionally, if the lower band boundary of the SSB of the base station is located above the lower band boundary of the CORESET0 of the base station and there is an overlapping region between the SSB of the base station and the CORESET0 of the base station, generating a first advanced CRS by using the first Low-PAPR Sequence and the second Low-PAPR Sequence, including:
replacing the content in the second Low-PAPR Sequence, which is overlapped with the first Low-PAPR Sequence, with the target content in the first Low-PAPR Sequence to obtain the first advanced CRS; wherein the target content in the first Low-PAPR Sequence is the content of which the first Low-PAPR Sequence is overlapped.
Optionally, if the SSB of the base station and the CORESET0 of the base station do not have an overlapping region in the frequency domain, generating a first advanced CRS by using the first Low-PAPR Sequence and the second Low-PAPR Sequence includes:
combining the first Low-PAPR Sequence and the second Low-PAPR Sequence to obtain the first advanced CRS; wherein, the first advanced CRS belongs to the region outside the frequency domain range of the first Low-PAPR Sequence and the second Low-PAPR Sequence and is filled with predetermined values.
A second aspect of the present application provides a signal transmission method, which is applied to a terminal, and the signal transmission method includes:
receiving a time domain signal broadcast by a base station; wherein the time domain signal comprises a first auxiliary cell-specific reference signal (Additional CRS); the first advanced CRS is generated by utilizing a first Low peak-to-average power ratio Sequence Low-PAPR Sequence and a second Low-PAPR Sequence;
generating a third Low-PAPR Sequence by adopting a generating mode of the first Low-PAPR Sequence in the first advanced CRS, and completing downlink synchronization by utilizing a signal in a frequency range corresponding to the SSB extracted from the received time domain signal and the third Low-PAPR Sequence;
and generating a fourth Low-PAPR Sequence by adopting a generation mode of the second Low-PAPR Sequence in the first advanced CRS, and acquiring configuration information required by uplink synchronization by using a signal in a CORESET0 frequency domain range in the received time domain signal and the fourth Low-PAPR Sequence.
Optionally, the generating of the first Low-PAPR Sequence in the first advanced CRS is used to generate a third Low-PAPR Sequence, and the downlink synchronization is completed by using the signal in the frequency domain range corresponding to the SSB extracted from the received time domain signal and the third Low-PAPR Sequence, including:
generating a pseudo-random Sequence of the synchronous broadcast block SSB of the terminal, and performing discrete Fourier transform on the pseudo-random Sequence of the synchronous broadcast block SSB of the terminal to obtain the third Low-PAPR Sequence;
performing channel estimation by using the signal in the frequency domain range corresponding to the SSB extracted from the received time domain signal and the third Low-PAPR Sequence to obtain a channel estimation result, and demodulating a physical broadcast channel by using the channel estimation result to obtain main system information MIB;
and finishing downlink synchronization according to the MIB.
Optionally, the generating a fourth Low-PAPR Sequence by using the generating manner of the second Low-PAPR Sequence in the first advanced CRS, and acquiring the configuration information required for uplink synchronization by using the signal in the frequency domain range of CORESET0 in the received time domain signal and the fourth Low-PAPR Sequence, includes:
acquiring configuration information of CORESET0 of the terminal according to the MIB information;
generating a pseudo-random Sequence of the Additional CRS in the frequency domain range corresponding to the CORESET0 of the terminal, and performing discrete Fourier transform on the pseudo-random Sequence of the Additional CRS in the frequency domain range corresponding to the CORESET0 of the terminal to obtain a fourth Low-PAPR Sequence;
replacing the part of the fourth Low-PAPR Sequence, which is overlapped with the third Low-PAPR Sequence, with the target content of the third Low-PAPR Sequence to obtain a second advanced CRS; wherein, the target content in the third Low-PAPR Sequence is the content of the third Low-PAPR Sequence which is overlapped;
performing channel estimation by using the signal in the frequency domain range of the CORESET0 in the received time domain signal and the second Additional CRS to obtain the frequency domain channel response of the CORESET0 of the terminal in the frequency domain range;
blind-detecting a downlink control information format 1-0 in the time-frequency resource of the CORESET0 of the terminal;
if the blind detection of the downlink control information format 1-0 is successful in the time frequency resources of the CORESET0 of the terminal, the system message 1 is acquired in the physical downlink shared channel PDSCH corresponding to the time frequency resources indicated in the downlink control information format 1-0, and the configuration information required by uplink synchronization is acquired by using the system message 1.
A third aspect of the present application provides a base station, including:
one or more processors;
a storage device having one or more programs stored thereon;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of any of the first aspects.
A fourth aspect of the present application provides a terminal, comprising:
one or more processors;
a storage device having one or more programs stored thereon;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of any of the second aspects.
A fifth aspect of the present application provides a computer storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method of any one of the first aspects or the method of any one of the second aspects.
According to the scheme, the signal transmission method, the base station, the terminal and the computer storage medium are provided. According to the method, a first advanced CRS is generated by using a first Low-PAPR Sequence and a second Low-PAPR Sequence, the first Low-PAPR Sequence is obtained according to a pseudo-random Sequence of the advanced CRS in a frequency domain range corresponding to SSB of a base station, and the second Low-PAPR Sequence is obtained according to a pseudo-random Sequence of the advanced CRS in a frequency domain range corresponding to CORESET0 of the base station, so that under the condition that the lower boundary of the frequency band of the SSB of the base station is positioned above the lower boundary of the frequency band of CORESET0 of the base station, the starting point of the first advanced CRS is aligned with the lowest subcarrier of CORESET0 for initial access in the frequency domain range corresponding to CORESET0, and system information can be obtained by using the first advanced CRS under the condition that the width of the band is unknown; in the frequency domain range corresponding to the SSB, the starting point of the first Additional CRS is aligned with the lowest subcarrier of the SSB for initial access, and the first Additional CRS is used for performing downlink synchronization under the condition that the width of the bandwidth is unknown for the terminal.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a detailed flowchart of a signal transmission method according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of an SSB on an OFDM symbol according to another embodiment of the present application;
fig. 3 is a detailed flowchart of a signal transmission method according to another embodiment of the present application;
fig. 4 is a schematic diagram of a CRS and an Additional CRS on an OFDM symbol according to another embodiment of the present application;
fig. 5 is a schematic diagram of CRS placement under different frequency domain density factors according to another embodiment of the present application;
fig. 6 is a schematic diagram of a multiplexing mode of CORESET0 and SSB according to another embodiment of the present application;
FIG. 7 is a schematic diagram of obtaining a first Additional CRS under the condition that CORESET0 and SSB are overlapped according to another embodiment of the present application;
FIG. 8 is a schematic diagram of obtaining a first Additional CRS without coincidence between CORESET0 and SSB according to another embodiment of the present application;
fig. 9 is a detailed flowchart of a signal transmission method according to another embodiment of the present application;
fig. 10 is a flowchart illustrating a signal transmission method according to another embodiment of the present application;
fig. 11 is a flowchart illustrating a signal transmission method according to another embodiment of the present application;
FIG. 12 is a schematic diagram of PAPR distribution during an experiment provided by another embodiment of the present application;
fig. 13 is a schematic diagram of a base station for performing a signal transmission method according to another embodiment of the present application;
fig. 14 is a schematic diagram of a terminal for performing a signal transmission method according to another embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first", "second", and the like, referred to in this application, are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence of functions performed by these devices, modules or units, but the terms "include", or any other variation thereof are intended to cover a non-exclusive inclusion, so that a process, method, article, or apparatus that includes a series of elements includes not only those elements but also other elements that are not explicitly listed, or includes elements inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiment of the application provides a signal transmission method, as shown in fig. 1, specifically including the following steps:
s101, the base station acquires a synchronous broadcast block SSB of the base station.
The SSB is composed of three parts, namely, Primary Synchronization Signals (PSS), Secondary Synchronization Signals (SSS), and a Physical Broadcast Channel (PBCH).
As shown in fig. 2, the SSB occupies 4 Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain, and occupies 240 subcarriers (20 RBs) in the Frequency domain, and the number of the SSB is 0 to 239. The PSS is located at the middle 127 subcarriers of OFDM symbol 0. SSS is located in the middle 127 subcarriers of OFDM symbol 2; in order to protect PSS and SSS, there are different subcarrier padding bits 0 at both ends. PBCH is located in OFDM symbols 1 and 3 and occupies all subcarriers of 0-239.
Optionally, in another embodiment of the present application, an implementation manner of step S101, as shown in fig. 3, includes:
s301, generating a primary synchronization signal PSS, a secondary synchronization signal SSS and a physical broadcast channel PBCH.
S302, mapping the PSS, the SSS and the PBCH according to a satellite NR protocol to obtain the SSB of the base station.
After the PSS, the SSs, and the PBCH are mapped in a Synchronization signal (SS/PBCH) block, the SSB of the base station is obtained. Specifically, the mapping may be understood as that, as described above in relation to fig. 2, the PSS is located in the middle 127 subcarriers of OFDM symbol 0. SSS is located in the middle 127 subcarriers of OFDM symbol 2; PBCH is positioned in OFDM symbols 1 and 3 and occupies all subcarriers of 0-239.
S102, the base station generates a pseudo-random Sequence of an auxiliary cell dedicated reference signal (Additional CRS) in a frequency domain range corresponding to the SSB of the base station, and performs discrete Fourier transform on the pseudo-random Sequence of the Additional CRS in the frequency domain range corresponding to the SSB of the base station to obtain a first Low peak-to-average power ratio Sequence (Low-PAPR Sequence).
The CRS is used for demodulation, time-frequency synchronization tracking, doppler frequency shift estimation, channel quality measurement, beam signal measurement, and the like of a Physical Broadcast Channel (PBCH), a PDSCH, and a Physical Downlink Control Channel (PDCCH). The CRS is divided into a conventional CRS and an Additional CRS, and as shown in fig. 4, the generation and mapping of the conventional CRS (i.e., the reference signal CRS in fig. 4) and the Additional CRS (i.e., the auxiliary reference signal CRS in fig. 4) are consistent. A conventional CRS signal is fixed on an OFDM symbol with the number of each time slot being 0; additional CRS is present in the slot of the SSB on one of the OFDM symbols with slot number 7 in order to improve the detection accuracy of the PBCH.
It should be noted that the method obtains the first Low peak-to-average power ratio Sequence Low-PAPR Sequence by performing discrete fourier transform on the pseudorandom Sequence of the Additional CRS in the frequency domain range corresponding to the SSB of the base station, and is an embodiment of obtaining the first Low peak-to-average power ratio Sequence Low-PAPR Sequence according to the pseudorandom Sequence of the Additional CRS in the frequency domain range corresponding to the SSB of the base station.
First, a PN sequence is initialized, i.e. a first value of the PN sequence is generated, and the calculation formula for the initialization of the PN sequence is as follows:
Figure BDA0002868520550000081
wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0002868520550000082
is the cell ID.
Figure BDA0002868520550000083
Has the same meaning as NR when L max When the number is equal to 4, the number is 4,
Figure BDA0002868520550000084
n hf is a field indication, n when PBCH is transmitted in the first field of a frame hf 0, when PBCH is transmitted in the latter half of a frame, n hf ＝1；C init A first value of a PN sequence; i.e. i SSB Is the two Least Significant Bits (LSB) of the SSB index. When L is max Not greater than 8 or L max When the number is equal to 64, the number is,
Figure BDA0002868520550000085
i SSB is the three bit LSB of the SSB index. L is a radical of an alcohol max Is the number of SSBs present in one SSB period.
And then, calculating to obtain a pseudo-random sequence of the auxiliary cell specific reference signal (Additional CRS) in a frequency domain range corresponding to the SSB of the base station by using a preset pseudo-random sequence generation formula of the Additional CRS.
Wherein, the Pseudo-random sequence (PN) sequence generation formula is:
Figure BDA0002868520550000086
r (m) is the last generated PN sequence; m CRS For the length of the output sequence r (m),
Figure BDA0002868520550000087
f density is the frequency domain density factor of the CRS;
Figure BDA0002868520550000088
is the number of Resource Elements (REs) in the frequency range; j is an imaginary representation of the complex number, the value multiplied by j representing the imaginary part of the complex number; when f is shown in FIG. 5 density When 1, CRS is placed without interval; when f is density When 2, the CRS is placed one by 1 Resource Element (RE).
In the above formula, c denotes c (n); c (n) is defined as:
c(n)＝(x 1 (n+N C )+x 2 (n+N C ))mod2
x 1 (n+31)＝(x 1 (n+3)+x 1 (n))mod2
x 2 (n+31)＝(x 2 (n+3)+x 2 (n+2)+x 2 (n+1)+x 2 (n))mod2
when N is present C ＝1600，x 1 (n) is initialized to x 1 (0)＝1,x 1 (n)＝0,n＝1,2,...,30，x 2 (n) is represented by
Figure BDA0002868520550000091
In this step, a preset discrete fourier transform formula is used to perform discrete fourier transform on a pseudo random Sequence of an advanced CRS in a frequency domain range corresponding to an SSB of a base station, and in a process of obtaining a first Low Peak-to-Average Power Ratio Sequence (Low-Peak to Average Power Ratio Sequence, Low-PAPR Sequence), the adopted discrete fourier transform formula is as follows:
Figure BDA0002868520550000092
k＝0,...,M CRS -1
the purpose of the discrete fourier transform is to ensure that the generated sequence retains single-carrier characteristics.
The process of obtaining the first Low-paprs sequence in this step can be understood as follows:
generating N according to the generation formula of the PN sequence ssb A PN sequence r (m) of a point, m being 0,1 ssb After-1, the discrete fourier transform formula is used to pair m 0,1 ssb -1 is N ssb Discrete Fourier transform of the point to obtain the first Low-PAPR Sequence, i.e. a ssb (0),a ssb (1),...,a ssb (N ssb -1)。
And, since the bandwidth of the SSB is fixed, there are a total of 240 REs, i.e., 20Resource Block (RB), so N ssb ＝240/f density 。
S103, the base station generates a pseudo-random Sequence of the Additional CRS in the frequency domain range corresponding to the control resource set CORESET0 of the base station, and discrete Fourier transform is performed on the pseudo-random Sequence of the Additional CRS in the frequency domain range corresponding to the CORESET0 of the base station to obtain a second Low-PAPR Sequence.
The frequency domain range corresponding to the control resource set CORESET0 of the base station may be the same as or different from the frequency domain range corresponding to the SSB of the base station, and is not limited herein.
It should be noted that, discrete fourier transform is performed on the pseudo random sequence of the advanced crs in the frequency domain range corresponding to the CORESET0 of the base station to obtain the second Low-paprs sequence, which is an embodiment of obtaining the second Low-paprs sequence according to the pseudo random sequence of the advanced crs in the frequency domain range corresponding to the CORESET0 of the base station.
It should be noted that, the pseudo-random sequence of the additional crs in the frequency domain range corresponding to the control resource set CORESET0 of the base station is generated in the same manner as the pseudo-random sequence of the additional crs in the frequency domain range corresponding to the SSB of the base station, and is obtained by calculating by using a preset PN sequence generation formula, which is not described herein again; the discrete fourier transform is performed on the pseudorandom sequence of the additional crs in the frequency domain range corresponding to the CORESET0 of the base station, and the discrete fourier transform is calculated by using a preset discrete fourier transform formula in the same manner as the discrete fourier transform is performed on the pseudorandom sequence of the additional crs in the frequency domain range corresponding to the SSB of the base station, which is not described herein again.
Specifically, a preset pseudo-random Sequence generation formula of the advanced CRS is utilized to calculate and obtain a pseudo-random Sequence of the advanced CRS in a frequency domain range corresponding to a control resource set CORESET0 of the base station, a preset discrete Fourier transform formula is utilized to perform discrete Fourier transform on the pseudo-random Sequence of the advanced CRS in a frequency domain range corresponding to a control resource set CORESET0 of the base station, and a second Low-PAPR Sequence, namely a cor (0),a cor (1),...,a cor (N cor -1)，N cor Is the second Low-paprs sequence length, it should be noted that the time-frequency position of CORESET0 is indicated by the field 'pdcch-ConfigSIB 1' in MIB, assuming CORESET0 co-occupies
Figure BDA0002868520550000101
RB, then
Figure BDA0002868520550000102
And S104, generating a first advanced CRS by using the first Low-PAPR Sequence and the second Low-PAPR Sequence.
As shown in fig. 6, there are 3 modes of CORESET0 and SSB multiplexing, which are mode 1, mode 2, and mode 3, respectively. In mode 1, the lower band boundary of the SSB of the base station is above the lower band boundary of the CORESET0 of the base station. In modes 2 and 3, SSB does not overlap CORESET0 in the frequency domain, where SSB may be above or below CORESET 0.
And if the lower frequency band boundary of the SSB of the base station is positioned above the lower frequency band boundary of the CORESET0 of the base station and the SSB of the base station and the CORESET0 of the base station have an overlapping region in the frequency domain, replacing the content which belongs to the overlapping with the first Low-PAPR Sequence in the second Low-PAPR Sequence by the target content in the first Low-PAPR Sequence by the base station to obtain the first advanced CRS. And the target content in the first Low-PAPR Sequence is the content of which the first Low-PAPR Sequence is overlapped.
Specifically, as shown in fig. 7, when the lower band boundary of the SSB of the base station is located above the lower band boundary of the CORESET0 of the base station and the SSB and the CORESET0 have an overlapping portion, the second Low-PAPR Sequence, a cor (0),a cor (1),...,a cor (N cor The Sequence of-1) is associated with the first Low-PAPR Sequence, a ssb (0),a ssb (1),...,a ssb (N ssb -1) coinciding content, a cor (M),a cor (M+1),...,a(M+N SSB -1) replace with the target content in the first Low-PAPR Sequence, i.e. a ssb (0),a ssb (1),...,a ssb (N ssb -1) obtaining a first additionalrs.
Of course, in the first additional crs, the predetermined value also needs to be filled in the region outside the frequency domain of SSB and CORESET 0.
If the SSB of the base station and the CORESET0 of the base station do not have an overlapping area on the frequency domain, combining a first Low-PAPRSequence and a second Low-PAPRSequence by the base station to obtain a first advanced CRS; and the first advanced CRS belongs to the region outside the frequency domain range of the first Low-PAPR Sequence and the second Low-PAPR Sequence and is filled with preset values.
Specifically, as shown in fig. 8, when CORESET0 and SSB do not overlap, the first advanced crs is obtained after the part except the first Low-paprs sequence and the second Low-paprs sequence is directly filled with a predetermined value.
It should be noted that the predetermined value may be 0,1, or the like, and this is only to illustrate that the resource element is a resource element other than the first additional crs, and is not limited herein.
S105, the base station broadcasts the time domain signal containing the first additional CRS.
Optionally, in another embodiment of the present application, an implementation manner of step S105, as shown in fig. 9, includes:
s901, mapping the first additional CRS to the OFDM symbol.
Specifically, a first additional crs is mapped to a symbol of an OFDM symbol numbered 7 according to an existing satellite NR protocol.
S902, filling resource elements except for the first additional CRS on the OFDM symbols into preset values to obtain the OFDM symbols to be modulated.
And S903, performing fast Fourier inverse conversion on the OFDM symbol to be modulated to obtain a time domain signal, and broadcasting the time domain signal.
S106, the terminal receives the time domain signal broadcasted by the base station.
The time domain signal comprises a first auxiliary cell dedicated reference signal AdditionalCRS; when the lower frequency band boundary of a synchronous broadcast block SSB of the base station is positioned above the lower frequency band boundary of a control resource set CORESET0 of the base station, the first advanced CRS is obtained by replacing the content which belongs to the second Low peak-to-average power ratio Sequence and is overlapped with the first Low peak-to-average power ratio Sequence with the target content in the first Low peak-to-average power ratio Sequence; and the target content in the first Low-PAPR Sequence is the content with the first Low-PAPR Sequence overlapped.
The first Low-PAPR Sequence and the second Low-PAPR Sequence are as shown in the contents of steps S102 and S103.
S107, the terminal generates a third Low-PAPR Sequence by adopting a first Low-PAPR Sequence generation mode in the first advanced CRS, and completes downlink synchronization by utilizing the signal in the frequency domain range corresponding to the SSB extracted from the received time domain signal and the third Low-PAPR Sequence.
Specifically, the terminal obtains the frequency domain position of the SSB through frequency domain search, and obtains the time domain data of the resource block occupied by the SSB through filtering; PSS searching is carried out on the obtained time domain data, timing information is obtained, and
Figure BDA0002868520550000121
demodulating SSS according to the timing information to obtain
Figure BDA0002868520550000122
Further obtain
Figure BDA0002868520550000123
The terminal and the base station agree on the generation mode of the Low-PAPR Sequence, therefore, after the terminal receives the time domain signal, the terminal also generates a third Low-PAPR Sequence expressed as a ssb (0),a ssb (1),...,a ssb (N ssb -1)。
Optionally, in another embodiment of the present application, an implementation manner of step S107, as shown in fig. 10, includes:
s1001, generating a pseudo random Sequence of the synchronous broadcast block SSB of the terminal, and performing discrete Fourier transform on the pseudo random Sequence of the synchronous broadcast block SSB of the terminal to obtain a third Low-PAPR Sequence.
Specifically, the method for generating the third Low-PAPR Sequence may refer to the method for generating the first Low-PAPR Sequence in the above embodiment, and the manner of generating the third Low-PAPR Sequence and the first Low-PAPR Sequence is the same.
S1002, performing channel estimation by using a signal in a frequency domain range corresponding to the SSB extracted from the received time domain signal and a third Low-PAPR Sequence to obtain a channel estimation result, and demodulating a physical broadcast channel by using the channel estimation result to obtain main system information MIB.
Specifically, signals Sssb (0), Sssb (1), … Sssb (Nssb-1) and a in the frequency domain range corresponding to SSB are extracted from the received time domain signal ssb (0),a ssb (1),...,a ssb (N ssb -1) performing channel estimation; and obtaining MIB (Master information Block) according to the obtained PBCH by blind detection of the channel estimation.
S1003, finishing downlink synchronization according to the MIB.
S108, the terminal generates a fourth Low-PAPR Sequence by adopting a generation mode of a second Low-PAPR Sequence in the first advanced CRS, and acquires configuration information required by uplink synchronization by using a signal in a CORESET0 frequency domain range in the received time domain signal and the fourth Low-PAPR Sequence.
Optionally, in another embodiment of the present application, an implementation manner of step S108, as shown in fig. 11, includes:
s1101, acquiring configuration information of CORESET0 of the terminal according to the MIB information.
Specifically, the time-frequency resource position of CORESET0 is obtained according to the field 'ssb-SubcarrierOffset' and the field 'pdcch-ConfigSIB 1' in the MIB.
S1102, generating a pseudo-random Sequence of the Additional CRS in the frequency domain range corresponding to the CORESET0 of the terminal, and performing discrete Fourier transform on the pseudo-random Sequence of the Additional CRS in the frequency domain range corresponding to the CORESET0 of the terminal to obtain a fourth Low-PAPR Sequence.
It should be noted that, the method for generating the fourth Low-PAPR Sequence may refer to the method for generating the second Low-PAPR Sequence in the above embodiment, and the manner of generating the fourth Low-PAPR Sequence and the second Low-PAPR Sequence is the same.
S1103, replacing the part of the fourth Low-PAPR Sequence, which is overlapped with the third Low-PAPR Sequence, with the target content of the third Low-PAPR Sequence to obtain a second advanced CRS.
And the target content in the third Low-PAPR Sequence is the content of the third Low-PAPR Sequence which is overlapped.
It should be noted that, for a method for generating the second Additional CRS, reference may be made to the method for generating the first Additional CRS in the foregoing embodiment, and details are not repeated here, where the second Additional CRS may be expressed as:
s＝[a cor (0),a cor (1),...,a cor (M-1),a ssb (0),a ssb (1),...,a ssb (N ssb -1),a cor (M+N ssb ),...,a cor (N cor -1)]。
if the lower band boundary of the SSB of the base station is located above the lower band boundary of the CORESET0 of the base station and the SSB of the base station and the CORESET0 of the base station overlap each other in the frequency domain, a second Additional CRS is obtained as in step S1103. And under the condition that the SSB of the base station and the CORESET0 of the base station do not have an overlapping area on a frequency domain, combining the fourth Low-PAPR Sequence and the third Low-PAPR Sequence to obtain a second advanced CRS. Of course, the second advanced CRS belongs to the third and fourth Low-PAPR sequences out of the frequency domain, filled with predetermined values.
S1104, channel estimation is carried out by using a signal in the frequency domain range of CORESET0 in the received time domain signal and a second Additional CRS, and frequency domain channel response of the CORESET0 of the terminal in the frequency domain range is obtained.
Wherein: the signal in the CORESET0 frequency domain range from the received time domain signal is expressed as: s' ═ Scor (0), Scor (1), … Sssb (M-1), Sssb (0), Sssb (1), … Sssb (Nssb-1), Scor (M + Nssb), … Sssb (Ncor-1)) ].
Specifically, channel estimation is performed by using S and S', and channel information in the frequency domain range of CORESET0 is obtained.
S1105, according to the channel information in the frequency domain range of CORESET0, blindly detecting the format 1-0 of the downlink control information in the time frequency resource of CORESET0 of the terminal.
S1106, if the blind detection of the downlink control information format 1-0 is successful in the time frequency resources of the CORESET0 of the terminal, acquiring a system message 1 in a Physical Downlink Shared Channel (PDSCH) corresponding to the time frequency resources indicated in the downlink control information format 1-0, and acquiring configuration information required for uplink synchronization by using the system message 1.
To measure the effect of the present invention on reducing PAPR, the following simulation was performed.
The subcarrier spacing in the satellite protocol was 120kHz, so the simulation specifically selected the corresponding table 13-8 in [3, TS 38.213] with subcarrier spacing of 120kHz for SSBs and PDCCH, and the relative positions of all 9 SSBs and CORESET0 in the table, as shown in table 1:
Figure BDA0002868520550000141
TABLE 1
Wherein the content of the first and second substances,
Figure BDA0002868520550000151
is the number of RBs occupied by CORESET. The offset is in RB units and is directed from the lower boundary of CORESET to the lower boundary of SSB, where the offset is positive when the lower boundary of CORESET is below the lower boundary of SSB, negative when the lower boundary of CORESET is above the lower boundary of SSB, and 0 when the lower boundary of CORESET coincides with the lower boundary of SSB.
When the SSB is located at different positions in the BWP, the PAPR distribution of the generated time domain data may fluctuate slightly, and in order to study the generality, the case when the SSB offset is [507090110130150170] RB is selected, the principle of the SSB offset selection is to let the SSB and the CORESET all be located in the resource grid under the above 9 cases, and then average the PAPR distribution, and the result is shown in fig. 12:
the Old curve in fig. 12 refers to the PAPR distribution of the Additional CRS in the existing satellite NR protocol; the NewCase 0-NewCase 8 curves are the PAPR distributions of the Additional CRS obtained by the method of the invention, and respectively correspond to 9 relative positions of SSB and CORESET in the above table.
As can be seen from fig. 12, the PAPR of the Additional CRS can be significantly reduced by the method of the present invention.
As can be seen from the above schemes, in the signal transmission method provided in the present application, since the first advanced CRS is generated by using the first Low-PAPR Sequence and the second Low-PAPR Sequence, and the first Low-PAPR Sequence is obtained according to the pseudo-random Sequence of the advanced CRS within the frequency domain range corresponding to the SSB of the base station, and the second Low-PAPR Sequence is obtained according to the pseudo-random Sequence of the advanced CRS within the frequency domain range corresponding to the CORESET0 of the base station, when the lower band boundary of the SSB of the base station is located above the lower band boundary of the CORESET0 of the base station, in the frequency domain range corresponding to the CORESET0, the start point of the first advanced CRS is aligned with the lowest subcarrier of the CORESET0 for initial access, and when the width of the bandwidth is unknown, the first advanced CRS is used for obtaining the system message; in the frequency domain range corresponding to the SSB, the starting point of the first Additional CRS is aligned with the lowest subcarrier of the SSB for initial access, and the first Additional CRS is used for performing downlink synchronization under the condition that the width of the bandwidth is unknown for the terminal.
Another embodiment of the present application provides a base station, as shown in fig. 13, including:
one or more processors 1301.
A storage 1302 having one or more programs stored thereon.
The one or more programs, when executed by the one or more processors 1301, cause the one or more processors 1301 to implement the methods of steps S101-S105 as in the embodiments described above.
Another embodiment of the present application provides a terminal, as shown in fig. 14, including:
one or more processors 1401.
A storage 1402 on which one or more programs are stored.
The one or more programs, when executed by the one or more processors 1401, cause the one or more processors 1401 to implement the method of steps S106-S108 as in the embodiments described above.
Another embodiment of the present application provides a computer storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method as described in any of the above embodiments.
In the above embodiments disclosed in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The apparatus and method embodiments described above are illustrative only, as the flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present disclosure may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part. The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present disclosure, which are essential or part of the technical solutions contributing to the prior art, may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a live broadcast device, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present disclosure. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Those skilled in the art can make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (12)

1. A method for transmitting a signal, which is applied to a base station, includes:
acquiring a synchronous broadcast block SSB of a base station;
generating a pseudo-random Sequence of an auxiliary cell dedicated reference signal (Additional CRS) in a frequency domain range corresponding to the SSB of the base station, and obtaining a first Low peak-to-average power ratio Sequence (Low-PAPR Sequence) according to the pseudo-random Sequence of the Additional CRS in the frequency domain range corresponding to the SSB of the base station;
generating a pseudo-random Sequence of the Additional CRS in the frequency domain range corresponding to the control resource set CORESET0 of the base station, and obtaining a second Low-PAPR Sequence according to the pseudo-random Sequence of the Additional CRS in the frequency domain range corresponding to the CORESET0 of the base station;
generating a first advanced CRS by using the first Low-PAPR Sequence and the second Low-PAPR Sequence;
broadcasting a time domain signal containing the first additionalCRS.
2. The transmission method according to claim 1, wherein the acquiring the SSB of the BS comprises:
generating a primary synchronization signal PSS, a secondary synchronization signal SSS and a physical broadcast channel PBCH;
and mapping the PSS, the SSS and the PBCH according to a satellite NR protocol to obtain the SSB of the base station.
3. The transmission method according to claim 1, wherein the obtaining a first Low peak-to-average power ratio Sequence Low-PAPR Sequence according to a pseudo-random Sequence of an Additional CRS in a frequency domain range corresponding to the SSB of the base station comprises:
and performing discrete Fourier transform on a pseudo-random Sequence of the Additional CRS in a frequency domain range corresponding to the SSB of the base station to obtain a first Low peak-to-average power ratio Sequence Low-PAPR Sequence.
4. The transmission method according to claim 1, wherein the obtaining a second Low-PAPR Sequence according to a pseudo-random Sequence of an Additional CRS in a frequency domain range corresponding to CORESET0 of the base station comprises:
and performing discrete Fourier transform on the pseudorandom Sequence of the AdditionalCRS in the frequency domain range corresponding to the CORESET0 of the base station to obtain a second Low-PAPR Sequence.
5. The transmission method according to claim 1, wherein if a lower band boundary of the SSB of the base station is located above an lower band boundary of the CORESET0 of the base station and there is an overlapping region between the SSB of the base station and the CORESET0 of the base station, generating a first advanced crs by using the first Low-PAPR Sequence and the second Low-PAPR Sequence, comprising:
replacing the content in the second Low-PAPR Sequence, which is overlapped with the first Low-PAPR Sequence, with the target content in the first Low-PAPR Sequence to obtain the first advanced CRS; wherein the target content in the first Low-PAPR Sequence is the content of which the first Low-PAPR Sequence is overlapped.
6. The transmission method according to claim 1, wherein if there is no overlapping region between the SSB of the base station and the CORESET0 of the base station in the frequency domain, the generating a first advanced CRS using the first Low-PAPR Sequence and the second Low-PAPR Sequence comprises:
combining the first Low-PAPR Sequence and the second Low-PAPR Sequence to obtain the first advanced CRS; wherein, the first advanced CRS is filled with predetermined values in the region outside the frequency domain of the first Low-PAPR Sequence and the second Low-PAPR Sequence.
7. A signal transmission method is applied to a terminal, and comprises the following steps:
receiving a time domain signal broadcast by a base station; wherein the time domain signal comprises a first auxiliary cell-specific reference signal AdditionalCRS; the first advanced CRS is generated by utilizing a first Low peak-to-average power ratio Sequence Low-PAPR Sequence and a second Low-PAPR Sequence;
generating a third Low-PAPR Sequence by adopting a generation mode of the first Low-PAPR Sequence in the first advanced CRS, and completing downlink synchronization by utilizing a signal in a frequency domain range corresponding to the SSB extracted from the received time domain signal and the third Low-PAPR Sequence;
and generating a fourth Low-PAPR Sequence by adopting a generation mode of the second Low-PAPR Sequence in the first advanced CRS, and acquiring configuration information required by uplink synchronization by using a signal in a CORESET0 frequency domain range in the received time domain signal and the fourth Low-PAPR Sequence.
8. The transmission method according to claim 7, wherein the generating manner of the first Low-PAPR Sequence in the first advanced CRS is adopted to generate a third Low-PAPR Sequence, and the downlink synchronization is completed by using the signal in the frequency domain range corresponding to the SSB extracted from the received time domain signal and the third Low-PAPR Sequence, including:
generating a pseudo-random Sequence of the synchronous broadcast block SSB of the terminal, and performing discrete Fourier transform on the pseudo-random Sequence of the synchronous broadcast block SSB of the terminal to obtain the third Low-PAPR Sequence;
performing channel estimation by using the signal in the frequency domain range corresponding to the SSB extracted from the received time domain signal and the third Low-PAPR Sequence to obtain a channel estimation result, and demodulating a physical broadcast channel by using the channel estimation result to obtain main system information MIB;
and finishing downlink synchronization according to the MIB.
9. The transmission method according to claim 7, wherein the generating of the second Low-PAPR Sequence in the first advanced CRS, generating a fourth Low-PAPR Sequence, and acquiring configuration information required for uplink synchronization by using a signal in a CORESET0 frequency domain range in the received time domain signal and the fourth Low-PAPR Sequence, includes:
acquiring configuration information of CORESET0 of the terminal according to the MIB information;
generating a pseudo-random Sequence of the additional CRS in the frequency domain range corresponding to the CORESET0 of the terminal, and performing discrete Fourier transform on the pseudo-random Sequence of the additional CRS in the frequency domain range corresponding to the CORESET0 of the terminal to obtain a fourth Low-PAPR Sequence;
replacing the part of the fourth Low-PAPR Sequence, which is overlapped with the third Low-PAPR Sequence, with the target content of the third Low-PAPR Sequence to obtain a second advanced CRS; wherein, the target content in the third Low-PAPR Sequence is the content where the third Low-PAPR Sequence is overlapped;
performing channel estimation by using the signal in the frequency domain range of the CORESET0 in the received time domain signal and the second additionalCRS to obtain the frequency domain channel response of the CORESET0 of the terminal in the frequency domain range;
blind-detecting a downlink control information format 1-0 in the time-frequency resource of the CORESET0 of the terminal;
if the blind detection of the downlink control information format 1-0 is successful in the time frequency resources of the CORESET0 of the terminal, acquiring a system message 1 in a Physical Downlink Shared Channel (PDSCH) corresponding to the time frequency resources indicated in the downlink control information format 1-0, and acquiring configuration information required for uplink synchronization by using the system message 1.
10. A base station, comprising:
one or more processors;
a storage device having one or more programs stored thereon;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of any of claims 1-6.
11. A terminal, comprising:
one or more processors;
a storage device having one or more programs stored thereon;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of any of claims 7-9.
12. A computer storage medium, having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method of any of claims 1 to 6, or the method of any of claims 7 to 9.
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