CN116916436A - Method and system for transmitting synchronizing signal - Google Patents

Method and system for transmitting synchronizing signal Download PDF

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Publication number
CN116916436A
CN116916436A CN202310950592.2A CN202310950592A CN116916436A CN 116916436 A CN116916436 A CN 116916436A CN 202310950592 A CN202310950592 A CN 202310950592A CN 116916436 A CN116916436 A CN 116916436A
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China
Prior art keywords
frequency
period
transmitting
base station
sss
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CN202310950592.2A
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Chinese (zh)
Inventor
吕磊
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Sichuan Innogence Technology Co Ltd
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Sichuan Innogence Technology Co Ltd
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Priority to CN202310950592.2A priority Critical patent/CN116916436A/en
Publication of CN116916436A publication Critical patent/CN116916436A/en
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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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2649—Demodulators
    • H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • 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

Abstract

The application discloses a method and a system for transmitting synchronous signals, wherein the method comprises the following steps: s1: determining system parameters, wherein the parameters are pre-stored as a communication protocol at a base station side and a terminal side after configuration is completed; s2: the base station generates a synchronous signal SS frequency domain sequence according to the protocol specification; s3: converting the SS frequency domain sequence into an SS time domain signal through inverse Fourier transform (IDFT); s4: the base station transmits a plurality of SSs in an SS period, and different SSs use different preset SS transmission center frequencies to offset Doppler frequency offset; s5: the terminal performs SS acquisition in the received signal using the same SS reception center frequency as the SS transmission center frequency. The application solves the problem that the success rate of capturing SS signals by using the time domain one-dimensional SS search in the high-speed mobile communication scene is reduced.

Description

Method and system for transmitting synchronizing signal
Technical Field
The present application relates to the field of wireless communications technologies, and in particular, to a method and a system for transmitting a synchronization signal.
Background
In the current mobile communication technology represented by LTE (long term evolution, i.e., fourth generation mobile communication technology), NR (new air interface, i.e., fifth generation mobile communication technology), a terminal acquires cell time-frequency synchronization by acquiring a Synchronization Signal (SS) transmitted by a base station. Since the terminal cannot acquire time and frequency information of the base station signal before time-frequency synchronization is completed, the terminal needs to search for SS in 2 dimensions of time domain and frequency domain at the same time in the received signal continuously, which is called time-frequency two-dimensional SS search. Because the operation complexity of the time-frequency two-dimensional SS search is higher, which causes the increase of the power consumption of the terminal, in order to simplify the process complexity protocol (the protocol in the application refers to 3GPP TS 38.211Realease 16 version protocol), the transmission center frequency of the SS (the transmission center frequency of the SS is defined as the transmission frequency of the sub-carrier corresponding to the ordered positive middle element in the SS frequency domain sequence when the base station transmits the SS, the number of the sub-carriers occupied by the SS sequence is odd, so that the ordered positive middle element is definitely present) is planned at the known fixed frequency position of the terminal, thus the terminal only needs to use the fixed SS reception center frequency (the SS reception center frequency is defined as the frequency of the sub-carrier corresponding to the ordered positive middle element in the SS frequency domain sequence in the received signal when the terminal receives the SS, and the protocol is defined as the number of the sub-carrier occupied by the SS sequence is odd, so that the ordered positive middle element is definitely present) to perform the one-dimensional search of the SS signal in the time domain (the process is called the one-dimensional SS search of the time domain, which greatly simplifies the complexity of the initial synchronous search of the terminal.
However, in the high-speed mobile communication scenario, for example, the low-orbit satellite communication scenario, the SS arrives at the terminal with a large doppler frequency offset, which makes the SS receiving center frequency of the terminal and the SS actual center frequency of the received signal (the SS actual center frequency of the received signal is defined as the actual frequency of the subcarrier corresponding to the element in the middle of the SS frequency domain sequence ordering in the received signal when the terminal receives the SS, since the number of subcarriers occupied by the SS sequence is an odd number, the element in the middle of the ordering is definitely present) have a large deviation (before the SS acquisition is completed, the terminal cannot know the frequency deviation), so that the success probability of the terminal to acquire the SS signal using the time domain one-dimensional SS search is greatly reduced. In order to solve the problem, the prior art scheme also needs the terminal to complete the time-frequency two-dimensional SS search to offset the influence of Doppler frequency offset, so that the complexity of initial synchronous search of the terminal is greatly increased.
Disclosure of Invention
The application aims to provide a synchronous signal transmitting method and a synchronous signal transmitting system, which are used for solving the technical problem that the success rate of capturing SS signals is reduced when a terminal uses a time domain one-dimensional SS search in a high-speed mobile communication scene.
The application is realized by adopting the following technical scheme: a method for transmitting a synchronization signal, comprising the steps of:
s1: determining system parameters, wherein the parameters are pre-stored as a communication protocol at a base station side and a terminal side after configuration is completed;
s2: the base station generates a synchronous signal SS frequency domain sequence according to the protocol specification;
s3: converting the SS frequency domain sequence into an SS time domain signal through inverse Fourier transform (IDFT);
s4: the base station transmits a plurality of SSs in an SS period, and different SSs use different preset SS transmission center frequencies to offset Doppler frequency offset;
s5: the terminal performs SS acquisition in the received signal using the same SS reception center frequency as the SS transmission center frequency.
Further, the parameters include: subcarrier spacing Δf, SS transmission period T SS Standard center frequency f of SS emission Tx Length of SS sequence L SS Number of SS transmissions per SS period N SS Transmission time of each SS in the current SS transmission period relative to the start of periodCenter frequency f of transmission of first SS in period 0 Frequency difference f between the emission centers of adjacent SSs d 。
Further, the transmission center frequency difference f of the adjacent SSs d The configuration range of (2) is as follows: f is more than or equal to 0.1 delta f d ≤Δf。
Further, the step S2 specifically includes: the base station generates a synchronous signal SS frequency domain sequence according to the protocol specification:
X SS (m),m＝0,…,L SS -1；
wherein L is SS SS frequency domain sequence length specified for protocol.
Further, the step S3 specifically includes: converting the SS frequency domain sequence into an SS time domain signal by an inverse fourier transform IDFT:
further, the step S4 specifically includes: the base station transmits N in a certain SS period SS The number of SSs, assuming that the time from the start of a single SS period is t=0, then the nth period SS The SS is:
further, the step S5 specifically includes: terminal receives center frequency f using SS Rx ＝f Tx The SS acquisition is completed in the received signal, and the SS acquisition is realized by adopting a received signal sliding window correlation algorithm, so long as the correlation coefficient is larger than the threshold, the SS acquisition can be considered to be completed.
A synchronous signal transmitting system comprises a configuration module, a conversion module, a transmitting module and a capturing module, wherein,
the configuration module is used for determining system parameters, and the parameters are pre-stored as a communication protocol on a base station side and a terminal side after the configuration is completed;
the conversion module generates a synchronous signal SS frequency domain sequence according to the protocol specification, and converts the SS frequency domain sequence into an SS time domain signal through inverse Fourier transform (IDFT);
the transmitting module transmits a plurality of SSs in one SS period, and different SSs use different preset SS transmission center frequencies to offset Doppler frequency offset;
and the acquisition module is used for completing the acquisition of the SS in the received signal by using the SS receiving center frequency which is the same as the SS transmitting center frequency.
A computer program product comprising a computer program which, when executed by a processor, implements the method described above.
A computer readable storage medium storing a computer program which, when executed by a processor, implements the method described above.
The application has the beneficial effects that: the base station transmits a plurality of SSs with different transmission center frequencies in a single SS period, so that the transmission center frequencies of the SSs in the single SS period form an SS transmission center frequency set. In a high-speed mobile communication scenario, for example, a low-orbit satellite communication scenario, the SS transmitting center set overlaps with the doppler frequency offset to form a doppler SS center frequency set, so that the SS receiving center frequency used by the terminal can successfully acquire the SS as long as the SS receiving center frequency is close to one SS center frequency in the doppler SS center frequency set (in a plurality of SSs in one period, the terminal only needs to acquire one SS). In conclusion, the scheme of the application solves the problem that the success rate of capturing SS signals by using the time domain one-dimensional SS search in the high-speed mobile communication scene is reduced, and compared with the prior scheme, the operation complexity of the terminal is obviously reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Example 1
Referring to fig. 1, a method for transmitting a synchronization signal includes the steps of:
s1: determining system parameters, wherein the parameters are pre-stored as a communication protocol at a base station side and a terminal side after configuration is completed;
s2: the base station generates a synchronous signal SS frequency domain sequence according to the protocol specification;
s3: converting the SS frequency domain sequence into an SS time domain signal through inverse Fourier transform (IDFT);
s4: the base station transmits a plurality of SSs in an SS period, and different SSs use different preset SS transmission center frequencies to offset Doppler frequency offset;
s5: the terminal performs SS acquisition in the received signal using the same SS reception center frequency as the SS transmission center frequency.
The base station transmits a plurality of SSs in 1 SS period according to the configured system parameters, and different SSs cancel Doppler frequency offset by using different preset SS transmission center frequencies, so that even if a large Doppler frequency offset terminal exists in the system, the SS acquisition can be completed by using a fixed receiving frequency through time domain one-dimensional SS search.
In this embodiment, the parameters include: configuring a system subcarrier spacing deltaf=120 kHz and SS transmission period T SS =10s, SS transmit standard center frequency f Tx Length of SS sequence L =7680 kHz SS =127 number of SS transmissions N per SS period SS The transmission time of the 8, 8 SSs at the start of the current SS transmission period is {01234567} s, the transmission center frequency f of the first SS in the period 0 Transmit center frequency difference f of =7500 kHz and adjacent SS d =60 kHz. Wherein the center frequency difference f is transmitted d On the one hand, the Doppler frequency deviation larger than 0.5 delta f generally leads to serious reduction of the SS acquisition performance (performance loss will be caused) based on the influence of the Doppler frequency deviation on the SS acquisition performanceNear 4 dB); doppler frequency deviation less than 0.1 delta f has no obvious effect on SS acquisition performance, so that the Doppler frequency deviation is generally 0.1 delta f less than or equal to f d ≤Δf。
In this embodiment, step S2 specifically includes: the base station generates a synchronous signal SS frequency domain sequence according to the protocol specification:
X SS (m),m＝0,…,126；
wherein L is SS SS frequency domain sequence length specified for protocol.
In this embodiment, step S3 specifically includes: converting the SS frequency domain sequence into an SS time domain signal by an inverse fourier transform IDFT:
in this embodiment, step S4 is specifically: the base station transmits N in a certain SS period SS The number of SSs, assuming that the time from the start of a single SS period is t=0, then the nth period SS The SS is:
0≤n SS ≤N SS -1. The transmission center frequency of one SS in the visible phase is higher than that of the previous SS by f d (the CP (cyclic prefix) process of an OFDM (orthogonal frequency division multiplexing) system is omitted here for simplicity of expression, which does not affect the scheme description of this patent).
Specifically, the base station transmits 8 SS (N SS For example, let t=0 be the starting time of a single SS period, then the 8 th SS signal in the period is:
in this embodiment, step S5 specifically includes: terminal receives center frequency f using SS Rx The SS acquisition is done in the received signal by time-domain one-dimensional SS search =7680 kHz. Generally, the difference between the SS receiving center frequency of the terminal and the SS actual center frequency of the received signal is greater than half subcarrier spacing (in this embodiment, the half subcarrier spacing is 60 kHz), which results in that the terminal cannot capture SS, and the current doppler frequency offset is assumed to be-110 kHz, and in the current industry general scheme, the terminal needs to use time-frequency two-dimensional SS search to offset the influence of the doppler frequency offset, which greatly increases the operation complexity of the terminal; if the scheme of the application is used, when the terminal finishes SS acquisition in the received signal by using the time domain one-dimensional SS search (the SS acquisition can be realized by using the currently common received signal sliding window correlation algorithm)Now, x is considered to be SS acquisition complete as long as the correlation coefficient is greater than the threshold) SS,5 SS actual center frequency and f of (t) Rx With a phase difference of only 10kHz (f Rx ＝7680kHz，x SS,5 SS actual center frequency=f of (t) Tx +120kHz-110 kHz=7690 kHz), the acquisition success rate of one-dimensional SS search can be remarkably improved (in a plurality of SSs in one period, the terminal only needs to finish acquisition of one SS). In conclusion, the application enables the terminal to complete SS capture through the time domain one-dimensional SS search in the scene of the system with larger Doppler frequency offset, and compared with the prior art, the application greatly reduces the operation complexity of the terminal.
The application also provides a synchronous signal transmitting system, which comprises a configuration module, a conversion module, a transmitting module and a capturing module, wherein the configuration module determines system parameters, and the parameters are pre-stored as a communication protocol on a base station side and a terminal side after configuration; the conversion module generates a synchronous signal SS frequency domain sequence according to the protocol specification, and converts the SS frequency domain sequence into an SS time domain signal through inverse Fourier transform (IDFT); the transmitting module transmits a plurality of SSs in one SS period, and different SSs use different preset SS transmission center frequencies to offset Doppler frequency offset; and the acquisition module is used for completing the acquisition of the SS in the received signal by using the SS receiving center frequency which is the same as the SS transmitting center frequency.
The application also provides a computer program product comprising a computer program which, when executed by a processor, implements the above-described method of transmitting a synchronization signal.
The application also provides a computer readable storage medium storing a computer program which, when executed by a processor, implements the above-described method of transmitting a synchronization signal.
Based on the above embodiments, the present application has at least the following technical effects:
the base station transmits a plurality of SSs with different transmission center frequencies in a single SS period, so that the transmission center frequencies of the SSs in the single SS period form an SS transmission center frequency set. In a high-speed mobile communication scenario, for example, a low-orbit satellite communication scenario, the SS transmitting center set overlaps with the doppler frequency offset to form a doppler SS center frequency set, so that the SS receiving center frequency used by the terminal can successfully acquire the SS as long as the SS receiving center frequency is close to one SS center frequency in the doppler SS center frequency set (in a plurality of SSs in one period, the terminal only needs to acquire one SS). In conclusion, the scheme of the application solves the problem that the success rate of capturing SS signals by using the time domain one-dimensional SS search in the high-speed mobile communication scene is reduced, and compared with the prior scheme, the operation complexity of the terminal is obviously reduced.
For the foregoing embodiments, a series of combinations of actions are described for simplicity of description, but it should be understood by those skilled in the art that the present application is not limited by the order of actions described, as some steps may be performed in other order or simultaneously in accordance with the present application. Further, it should be understood by those skilled in the art that the embodiments described in the specification are preferred embodiments and that the actions involved are not necessarily required for the present application.
In the above embodiments, the basic principle and main features of the present application and advantages of the present application are described. It will be appreciated by persons skilled in the art that the present application is not limited by the foregoing embodiments, but rather is shown and described in what is considered to be illustrative of the principles of the application, and that modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the application, and therefore, is within the scope of the appended claims.

Claims (10)

1. A method for transmitting a synchronization signal, comprising the steps of:
s1: determining system parameters, wherein the parameters are pre-stored as a communication protocol at a base station side and a terminal side after configuration is completed;
s2: the base station generates a synchronous signal SS frequency domain sequence according to the protocol specification;
s3: converting the SS frequency domain sequence into an SS time domain signal through inverse Fourier transform (IDFT);
s4: the base station transmits a plurality of SSs in an SS period, and different SSs use different preset SS transmission center frequencies to offset Doppler frequency offset;
s5: the terminal performs SS acquisition in the received signal using the same SS reception center frequency as the SS transmission center frequency.
2. The method for transmitting a synchronization signal according to claim 1, wherein said parameters include: subcarrier spacing Δf, SS transmission period T SS Standard center frequency f of SS emission Tx Length of SS sequence L SS Number of SS transmissions per SS period N SS Transmission time of each SS in the current SS transmission period relative to the start of periodCenter frequency f of transmission of first SS in period 0 Frequency difference f between the emission centers of adjacent SSs d 。
3. The method of transmitting a synchronization signal according to claim 2, wherein the transmission center frequency difference f of the neighboring SSs d The configuration range of (2) is as follows: f is more than or equal to 0.1 delta f d ≤Δf。
4. The method of transmitting a synchronization signal according to claim 2, wherein step S2 specifically comprises: the base station generates a synchronous signal SS frequency domain sequence according to the protocol specification:
X SS (m),m＝0,…,L SS -1；
wherein L is SS SS frequency domain sequence length specified for protocol.
5. The method for transmitting a synchronization signal according to claim 4, wherein step S3 specifically comprises: converting the SS frequency domain sequence into an SS time domain signal by an inverse fourier transform IDFT:
6. the method for transmitting a synchronization signal according to claim 5, wherein step S4 specifically comprises: the base station transmits N in a certain SS period SS The number of SSs, assuming that the time from the start of a single SS period is t=0, then the nth period SS The SS is:
7. the method for transmitting a synchronization signal according to claim 6, wherein step S5 specifically comprises: terminal receives center frequency f using SS Rx ＝f Tx The SS acquisition is completed in the received signal, and the SS acquisition is realized by adopting a received signal sliding window correlation algorithm, so long as the correlation coefficient is larger than the threshold, the SS acquisition can be considered to be completed.
8. A synchronous signal transmitting system is characterized by comprising a configuration module, a conversion module, a transmitting module and a capturing module, wherein,
the configuration module is used for determining system parameters, and the parameters are pre-stored as a communication protocol on a base station side and a terminal side after the configuration is completed;
the conversion module generates a synchronous signal SS frequency domain sequence according to the protocol specification, and converts the SS frequency domain sequence into an SS time domain signal through inverse Fourier transform (IDFT);
the transmitting module transmits a plurality of SSs in one SS period, and different SSs use different preset SS transmission center frequencies to offset Doppler frequency offset;
and the acquisition module is used for completing the acquisition of the SS in the received signal by using the SS receiving center frequency which is the same as the SS transmitting center frequency.
9. A computer program product comprising a computer program which, when executed by a processor, implements the method according to any one of claims 1 to 7.
10. A computer readable storage medium, characterized in that the storage medium stores a computer program which, when executed by a processor, implements the method according to any one of claims 1-7.
CN202310950592.2A 2023-07-31 2023-07-31 Method and system for transmitting synchronizing signal Pending CN116916436A (en)

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Application Number Priority Date Filing Date Title
CN202310950592.2A CN116916436A (en) 2023-07-31 2023-07-31 Method and system for transmitting synchronizing signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310950592.2A CN116916436A (en) 2023-07-31 2023-07-31 Method and system for transmitting synchronizing signal

Publications (1)

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