CN114079606A - Air interface time alignment method and device and electronic equipment - Google Patents
Air interface time alignment method and device and electronic equipment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
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- 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
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
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- 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
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- H04L27/2659—Coarse or integer frequency offset determination and synchronisation
Abstract
The invention provides an air interface time alignment method, an air interface time alignment device and electronic equipment, which are used for acquiring coarse timing data determined by a coarse timing estimation mode based on a ZC sequence under the condition of determining that the use condition of coarse timing estimation is met; and if the coarse timing data is in a preset numerical range, carrying out air interface time alignment operation based on the coarse timing data. Because the transmission delay suitable for the rough timing estimation mode of the ZC sequence is large, the air interface time alignment can be quickly carried out when the transmission delay exceeds the length of one CP.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for aligning air interface time, and an electronic device.
Background
In the TDD mode, two communicating parties send data in different frames, and interference can be avoided only by performing time alignment at an air interface. In the LTE (long term evolution of the universal mobile telecommunications technology), a base station measures a time offset of a terminal and then notifies the terminal to actively adjust transmission time, thereby ensuring that the two parties are synchronized at an air interface. The base station measures the time offset of the terminal and estimates the time offset through the reference signal.
However, the timing adjustment of the conventional LTE technology can only be limited to the adjustment range of one cyclic prefix CP (cyclic prefix), and when the transmission delay exceeds the length of one CP, the delay estimated by the reference signal is seriously inaccurate, and the transmission distance is severely limited.
Disclosure of Invention
In view of this, the present invention provides an air interface time alignment method, an air interface time alignment device, and an electronic device, so as to solve the problems that when a transmission delay exceeds a CP length, an estimated delay of a reference signal is seriously inaccurate, and a transmission distance is severely limited.
In order to solve the technical problems, the invention adopts the following technical scheme:
an air interface time alignment method comprises the following steps:
under the condition that the use condition of rough timing estimation is determined to be met, rough timing data determined based on a rough timing estimation mode of a ZC sequence is obtained;
and if the coarse timing data is in a preset numerical range, carrying out air interface time alignment operation based on the coarse timing data.
Optionally, the determining that the coarse timing estimate usage condition is satisfied includes:
acquiring fine timing data determined by a fine timing estimation mode based on a reference signal;
and if the signal-to-noise ratio corresponding to the fine timing data is not greater than a preset value, determining that the use condition of the coarse timing estimation is met.
Optionally, after performing the air interface time alignment operation based on the coarse timing data, the method further includes:
acquiring updated fine timing data when the acquisition time corresponding to the fine timing data is reached; and acquiring the updated coarse timing data when the acquisition time corresponding to the coarse timing data is reached;
if the signal-to-noise ratio corresponding to the fine timing data is larger than a preset value, performing air interface time alignment operation based on the updated fine timing data;
and if the signal-to-noise ratio corresponding to the fine timing data is not greater than a preset value, performing air interface time alignment operation based on the updated coarse timing data.
Optionally, the fine timing data and the coarse timing data are both acquired periodically.
An air interface time alignment apparatus, comprising:
a first obtaining module, configured to obtain coarse timing data determined based on a coarse timing estimation manner of a ZC sequence when it is determined that a coarse timing estimation use condition is satisfied;
and the first alignment module is used for carrying out air interface time alignment operation based on the coarse timing data if the coarse timing data is in a preset numerical range.
Optionally, the first obtaining module is configured to, when determining that the coarse timing estimation using condition is satisfied, specifically:
acquiring fine timing data determined by a fine timing estimation mode based on a reference signal;
and if the signal-to-noise ratio corresponding to the fine timing data is not greater than a preset value, determining that the use condition of the coarse timing estimation is met.
Optionally, the method further comprises:
the data acquisition module is used for acquiring updated fine timing data when the acquisition time corresponding to the fine timing data is reached after the first alignment module performs the air interface time alignment operation based on the coarse timing data; and acquiring the updated coarse timing data when the acquisition time corresponding to the coarse timing data is reached;
the first alignment module is further configured to perform an air interface time alignment operation based on the updated fine timing data if the signal-to-noise ratio corresponding to the fine timing data is greater than a preset value; and if the signal-to-noise ratio corresponding to the fine timing data is not greater than a preset value, performing air interface time alignment operation based on the updated coarse timing data.
Optionally, the fine timing data and the coarse timing data are both acquired periodically.
A storage medium, where the storage medium includes a stored program, and where the program is executed to control a device in which the storage medium is located to execute the air interface time alignment method.
An electronic device, comprising: a memory and a processor;
wherein the memory is used for storing programs;
the processor calls a program and is used for executing the air interface time alignment method.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an air interface time alignment method, an air interface time alignment device and electronic equipment, which are used for acquiring coarse timing data determined by a coarse timing estimation mode based on a ZC sequence under the condition of determining that the use condition of coarse timing estimation is met; and if the coarse timing data is in a preset numerical range, carrying out air interface time alignment operation based on the coarse timing data. Because the transmission delay suitable for the rough timing estimation mode of the ZC sequence is large, the air interface time alignment can be quickly carried out when the transmission delay exceeds the length of one CP.
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 flowchart of a method for air interface time alignment according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for determining coarse timing data according to an embodiment of the present invention;
fig. 3 is a diagram of a sending/receiving access range according to an embodiment of the present invention;
fig. 4 is a scene schematic diagram of an air interface time alignment method according to an embodiment of the present invention;
fig. 5 is a scene schematic diagram of another air interface time alignment method according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an air interface time alignment apparatus according to an embodiment of the present invention.
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.
The embodiment of the invention provides an air interface time alignment method, which is mainly used for air interface time alignment of a receiving end and a sending end, and in a TDD mode, a terminal can communicate with a base station and can also communicate between terminals, so that the receiving end and the sending end can be either the base station or the TDD terminal. The air interface time alignment method in this embodiment is applied to a receiving end. The embodiment of the invention can be used for a broadband technology which needs to adopt time division, such as a TDD-LTE technology. In the broadband ad hoc network, the two communication side devices are completely equivalent, and a base station does not need to send a timing adjustment message to a terminal like the traditional LTE technology. The method can well solve the problem that the transmission distance between peer-to-peer devices changes, so that the time delay exceeds the CP.
Referring to fig. 1, the air interface time alignment method specifically includes:
s11, when the rough timing estimation using condition is satisfied, the rough timing data determined by the rough timing estimation mode based on the ZC sequence is obtained.
In practical applications, referring to fig. 2, the process of determining the coarse timing data based on the coarse timing estimation manner of ZC (Zadoff-chu, a sequence sent by a communication signal) sequence is as follows:
s21, the sending end maps the ZC sequence with the length of N to the appointed resource of the time-frequency domain.
When a transmitting end maps a ZC sequence with the length of N to a time-frequency domain designated resource, mapping is carried out according to data transmission rules of the transmitting end and a receiving end.
The data transmission rule may be: the time domain position is fixed, and the position is placed at the center position of the Frequency band on the Frequency domain after an Orthogonal Frequency Division Multiplexing (OFDM) symbol (orthogonal Frequency Division multiplexing) carrying a reference signal. Mapping is carried out from low frequency to high frequency in sequence, and mapping is carried out at the center of the frequency band on average.
S22, the sending end performs Inverse Fast Fourier Transform (IFFT) to obtain time domain data.
The IFFT is performed to convert frequency domain data into time domain data.
And S23, the sending end sends the time domain data to the receiving end.
And S24, the receiving end performs Fast Fourier Transform (FFT) on the time domain data and then performs correlation in the frequency domain.
Specifically, after receiving the time domain data, the receiving end performs Fast Fourier Transform (FFT) to obtain frequency domain data, and then performs correlation on the frequency domain. Specifically, the correlation result of filtering other data is obtained by using the correlation of ZC, that is, the result of multiplying two different root sequences is 0, and the result of multiplying the same root sequence is not 0.
S25, the receiving end performs IFFT and then selects the position with the maximum power, and the value is used as coarse timing data.
Specifically, referring to fig. 3, after receiving the time domain data of the current subframe, the receiving end takes 4096 sampling points near the DIS signal position, and obtains the frequency domain data after correlation by using the step S24. According to the Fourier transform characteristic, after the power of the subcarriers on the frequency domain is subjected to IFFT transform, the power of the subcarriers is superposed into a waveform of a time domain, and the position of the maximum value is obtained through screening. I.e., Coarse timing data, is denoted as Coarse TA.
Before using the coarse timing data to perform an air interface time alignment operation, the coarse timing estimation using condition needs to be satisfied, and the determination that the coarse timing estimation using condition is satisfied includes:
and obtaining fine timing data determined by a fine timing estimation mode based on the reference signal, and determining that the use condition of coarse timing estimation is met if the signal-to-noise ratio corresponding to the fine timing data is not greater than a preset value.
Specifically, before executing step S11, it may be determined whether the fine timing data fine TA is valid, and if so, the fine timing data fine TA is used to perform air interface time alignment, and if not, the Coarse timing data Coarse TA is used to perform air interface time alignment.
In practical application, referring to fig. 4, fig. 4 shows a process of determining fine timing data based on a reference signal by using a fine timing estimation method and performing slot alignment:
the base station or the peer-to-peer terminal uses the original timing to align the received data;
a base station or a peer-to-peer terminal measures a radio frequency signal transmitted by a terminal and estimates the time deviation between the base station and the peer-to-peer terminal, namely fine timing 1;
the base station or the peer terminal uses the fine timing 1 to receive data in a pulling mode;
the transmission time delay between the transmitting terminal and the receiving terminal changes due to the movement of the transmitting terminal or the receiving terminal;
the base station or the peer terminal measures the radio frequency signal transmitted by the terminal again, and estimates the time offset between the two, i.e. fine timing 2.
Wherein, the calculation process for determining the fine timing data fine timing is as follows:
calculating a premise: the system frame number and the sub-frame number of the receiver are consistent with those of the sender, and a sender A and a receiver B are set;
1. a generates a crs0 sequence according to the current subframe number, and assumes the phase at this time to be alpha 0;
2. b also generates a crs0 sequence, alpha0 in phase, based on the current subframe number;
3. when the data sent by A is transmitted wirelessly and arrives at B, the phase is not alpha0, but becomes alpha 1;
4. LTE considers that the phase change is caused by transmission delay, and the transmission delay side reflects the transmission distance;
5. b estimates the time delay T by using the local alpha0 of the B and the received alpha1, and the time delay is fine timing.
The SIGNAL-to-NOISE RATIO (SNR) and the SIGNAL-to-NOISE RATIO (S/N) in the fine timing data process are calculated and determined, wherein the name of the SNR or the S/N (Signal-to-NOISE RATIO) is also called SIGNAL-to-NOISE RATIO. Refers to the ratio of signal to noise in an electronic device or system. The signal refers to an electronic signal from the outside of the device to be processed by the device, the noise refers to an irregular extra signal (or information) which does not exist in the original signal generated after passing through the device, and the signal does not change along with the change of the original signal.
In this embodiment, the signal-to-noise ratio may be calculated in the process of signal communication between the base station and the terminal. After the signal-to-noise ratio is calculated, judging whether the signal-to-noise ratio is larger than a preset value; if not, it indicates that the fine TA mode is invalid and the coarse timing estimation using condition is satisfied, at this time, step S11 may be executed, that is, the coarse timing data is used to perform air interface time alignment. If the length is greater than the predetermined length, it indicates that the fine TA mode is reliable, and also indicates that the transmission delay does not exceed one CP length, and at this time, air interface time alignment may be performed in the fine TA mode.
And S12, if the coarse timing data is in a preset numerical range, carrying out air interface time alignment operation based on the coarse timing data.
After the Coarse timing data Coarse TA is obtained, whether the Coarse TA is within a preset value range is judged, wherein the preset value range can be 1000-2000, if so, the Coarse TA is valid, a Coarse timing estimation mode based on the ZC sequence can be used for air interface time alignment, and at this time, the Coarse TA is used for air interface time alignment.
After the air interface time alignment operation is performed based on the coarse timing data, along with the movement of the transmitting terminal or the continuous movement of the receiving terminal, the signal-to-noise ratio corresponding to the fine timing data changes, so that the signal-to-noise ratio corresponding to the fine timing data is monitored in real time and is larger than a preset value, and if the signal-to-noise ratio corresponding to the fine timing data is larger than the preset value, the air interface time alignment operation is performed based on the updated fine timing data; and if the signal-to-noise ratio corresponding to the fine timing data is not greater than a preset value, performing air interface time alignment operation based on the updated coarse timing data.
In addition, when the air interface time alignment operation is performed, fine timing data and coarse timing data need to be used, the fine timing data and the coarse timing data in this embodiment are periodically collected, and updated fine timing data is obtained when the obtaining time corresponding to the fine timing data is reached; and acquiring the updated coarse timing data when the acquisition time corresponding to the coarse timing data is reached.
That is, after the performing the air interface time alignment operation based on the coarse timing data, the method further includes:
acquiring updated fine timing data when the acquisition time corresponding to the fine timing data is reached; and acquiring the updated coarse timing data when the acquisition time corresponding to the coarse timing data is reached;
if the signal-to-noise ratio corresponding to the fine timing data is larger than a preset value, performing air interface time alignment operation based on the updated fine timing data;
and if the signal-to-noise ratio corresponding to the fine timing data is not greater than a preset value, performing air interface time alignment operation based on the updated coarse timing data.
It should be noted that, when the application scenario applicable to the embodiment of the present invention is two-node long-distance communication, the transmission delay is already much longer than the delay that can be tolerated by the physical layer of the ad hoc network system to receive the prsch (physical Received Shared channel) demodulation. If the PRSCH needs to be correctly demodulated, the transmission delay between the nodes needs to be estimated firstly, and the PRSCH is demodulated after corresponding data alignment operation is carried out.
Referring to fig. 5, the far point receiving end Rx0 comprises the following steps:
step 1, Rx0 obtains Coarse TA by using the discovery signal;
step 2, Rx0 aligns time domain data, namely using coarse TA to obtain data;
step 3, Rx0 normal PRSCH demodulation;
and 4, updating the fine TA.
Near Rx1 receiving processing:
step 1, using fine TA to obtain data;
step 2, RX1 normal PRSCH demodulation;
and 3, updating the fine TA.
As the near point moves toward the far point, the fin TA confidence may decrease due to the computed SNR as the fetch start position gradually exceeds the CP length. At this time, the confidence of coarse TA is raised, and the fetch operation is performed instead of fine TA. And updating the fine TA (compensated fine TA) again after the number taking calculation, increasing the confidence coefficient of the fine TA again, and then taking numbers by using the fine TA.
The timing method based on the reference signal and the timing method based on the signaling signal are switched according to the confidence coefficient, and the switching of the application scenes from far to near or from near to far can be met. Meanwhile, as the confidence degree switching is independently carried out between the two nodes in the broadband ad hoc network, the networking scheme can be greatly enriched, and the dynamic automatic adjustment can be carried out according to the actual networking requirement.
In the embodiment, under the condition that the use condition of rough timing estimation is determined to be met, rough timing data determined by a rough timing estimation mode based on a ZC sequence is obtained; and if the coarse timing data is in a preset numerical range, carrying out air interface time alignment operation based on the coarse timing data. Because the transmission delay suitable for the rough timing estimation mode of the ZC sequence is large, when the transmission delay exceeds one CP length along with the increase of the travel distance, the frame starting positions (actual access positions) of the two parties can be quickly aligned again by using the rough timing, and the transmission distance between the two parties is greatly enlarged.
Optionally, on the basis of the embodiment of the air interface time alignment method, another embodiment of the present invention provides an air interface time alignment apparatus, and with reference to fig. 6, the air interface time alignment apparatus may include:
a first obtaining module 11, configured to obtain coarse timing data determined based on a coarse timing estimation manner of the ZC sequence if it is determined that a coarse timing estimation use condition is satisfied;
and the first alignment module 12 is configured to perform an air interface time alignment operation based on the coarse timing data if the coarse timing data is within a preset numerical range.
Further, the first obtaining module is configured to, when determining that a coarse timing estimation use condition is satisfied, specifically:
acquiring fine timing data determined by a fine timing estimation mode based on a reference signal;
and if the signal-to-noise ratio corresponding to the fine timing data is not greater than a preset value, determining that the use condition of the coarse timing estimation is met.
Further, still include:
the data acquisition module is used for acquiring updated fine timing data when the acquisition time corresponding to the fine timing data is reached after the first alignment module performs the air interface time alignment operation based on the coarse timing data; and acquiring the updated coarse timing data when the acquisition time corresponding to the coarse timing data is reached;
the first alignment module 12 is further configured to perform an empty time alignment operation based on the updated fine timing data if the signal-to-noise ratio corresponding to the fine timing data is greater than a preset value; and if the signal-to-noise ratio corresponding to the fine timing data is not greater than a preset value, performing air interface time alignment operation based on the updated coarse timing data.
In the embodiment, under the condition that the use condition of rough timing estimation is determined to be met, rough timing data determined by a rough timing estimation mode based on a ZC sequence is obtained; and if the coarse timing data is in a preset numerical range, carrying out air interface time alignment operation based on the coarse timing data. Because the transmission delay suitable for the rough timing estimation mode of the ZC sequence is large, when the transmission delay exceeds one CP length along with the increase of the travel distance, the frame starting positions (actual access positions) of the two parties can be quickly aligned again by using the rough timing, and the transmission distance between the two parties is greatly enlarged.
It should be noted that, for the working process of each module in this embodiment, please refer to the corresponding description in the above embodiments, which is not described herein again.
Optionally, on the basis of the embodiments of the air interface time alignment method and apparatus, another embodiment of the present invention provides a storage medium, where a program is stored, and the program, when executed by a processor, implements the air interface time alignment method described below. Specifically, the method comprises the following steps:
an air interface time alignment method comprises the following steps:
under the condition that the use condition of rough timing estimation is determined to be met, rough timing data determined based on a rough timing estimation mode of a ZC sequence is obtained;
and if the coarse timing data is in a preset numerical range, carrying out air interface time alignment operation based on the coarse timing data.
Further, the determining that a coarse timing estimate usage condition is satisfied includes:
acquiring fine timing data determined by a fine timing estimation mode based on a reference signal;
and if the signal-to-noise ratio corresponding to the fine timing data is not greater than a preset value, determining that the use condition of the coarse timing estimation is met.
Further, after performing the air interface time alignment operation based on the coarse timing data, the method further includes:
acquiring updated fine timing data when the acquisition time corresponding to the fine timing data is reached; and acquiring the updated coarse timing data when the acquisition time corresponding to the coarse timing data is reached;
if the signal-to-noise ratio corresponding to the fine timing data is larger than a preset value, performing air interface time alignment operation based on the updated fine timing data;
and if the signal-to-noise ratio corresponding to the fine timing data is not greater than a preset value, performing air interface time alignment operation based on the updated coarse timing data.
In the embodiment, under the condition that the use condition of rough timing estimation is determined to be met, rough timing data determined by a rough timing estimation mode based on a ZC sequence is obtained; and if the coarse timing data is in a preset numerical range, carrying out air interface time alignment operation based on the coarse timing data. Because the transmission delay suitable for the rough timing estimation mode of the ZC sequence is large, when the transmission delay exceeds one CP length along with the increase of the travel distance, the frame starting positions (actual access positions) of the two parties can be quickly aligned again by using the rough timing, and the transmission distance between the two parties is greatly enlarged.
Optionally, on the basis of the embodiments of the air interface time alignment method and apparatus, another embodiment of the present invention provides an electronic device, including: a memory and a processor;
wherein the memory is used for storing programs;
the processor calls a program and is used to perform the air interface time alignment method described below. Specifically, the method comprises the following steps:
an air interface time alignment method comprises the following steps:
under the condition that the use condition of rough timing estimation is determined to be met, rough timing data determined based on a rough timing estimation mode of a ZC sequence is obtained;
and if the coarse timing data is in a preset numerical range, carrying out air interface time alignment operation based on the coarse timing data.
Further, the determining that a coarse timing estimate usage condition is satisfied includes:
acquiring fine timing data determined by a fine timing estimation mode based on a reference signal;
and if the signal-to-noise ratio corresponding to the fine timing data is not greater than a preset value, determining that the use condition of the coarse timing estimation is met.
Further, after performing the air interface time alignment operation based on the coarse timing data, the method further includes:
acquiring updated fine timing data when the acquisition time corresponding to the fine timing data is reached; and acquiring the updated coarse timing data when the acquisition time corresponding to the coarse timing data is reached;
if the signal-to-noise ratio corresponding to the fine timing data is larger than a preset value, performing air interface time alignment operation based on the updated fine timing data;
and if the signal-to-noise ratio corresponding to the fine timing data is not greater than a preset value, performing air interface time alignment operation based on the updated coarse timing data.
In the embodiment, under the condition that the use condition of rough timing estimation is determined to be met, rough timing data determined by a rough timing estimation mode based on a ZC sequence is obtained; and if the coarse timing data is in a preset numerical range, carrying out air interface time alignment operation based on the coarse timing data. Because the transmission delay suitable for the rough timing estimation mode of the ZC sequence is large, when the transmission delay exceeds one CP length along with the increase of the travel distance, the frame starting positions (actual access positions) of the two parties can be quickly aligned again by using the rough timing, and the transmission distance between the two parties is greatly enlarged.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or 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 the process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. 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 invention. Thus, the present invention 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 (10)
1. A method for air interface time alignment is characterized by comprising the following steps:
under the condition that the use condition of rough timing estimation is determined to be met, rough timing data determined based on a rough timing estimation mode of a ZC sequence is obtained;
and if the coarse timing data is in a preset numerical range, carrying out air interface time alignment operation based on the coarse timing data.
2. The air interface time alignment method according to claim 1, wherein the determining that the coarse timing estimation usage condition is satisfied comprises:
acquiring fine timing data determined by a fine timing estimation mode based on a reference signal;
and if the signal-to-noise ratio corresponding to the fine timing data is not greater than a preset value, determining that the use condition of the coarse timing estimation is met.
3. The air interface time alignment method according to claim 2, further comprising, after performing the air interface time alignment operation based on the coarse timing data:
acquiring updated fine timing data when the acquisition time corresponding to the fine timing data is reached; and acquiring the updated coarse timing data when the acquisition time corresponding to the coarse timing data is reached;
if the signal-to-noise ratio corresponding to the fine timing data is larger than a preset value, performing air interface time alignment operation based on the updated fine timing data;
and if the signal-to-noise ratio corresponding to the fine timing data is not greater than a preset value, performing air interface time alignment operation based on the updated coarse timing data.
4. The air interface time alignment method according to claim 3, wherein the fine timing data and the coarse timing data are both acquired periodically.
5. An air interface time alignment apparatus, comprising:
a first obtaining module, configured to obtain coarse timing data determined based on a coarse timing estimation manner of a ZC sequence when it is determined that a coarse timing estimation use condition is satisfied;
and the first alignment module is used for carrying out air interface time alignment operation based on the coarse timing data if the coarse timing data is in a preset numerical range.
6. The air interface time alignment apparatus according to claim 5, wherein the first obtaining module is configured to, when determining that a coarse timing estimation use condition is satisfied, specifically:
acquiring fine timing data determined by a fine timing estimation mode based on a reference signal;
and if the signal-to-noise ratio corresponding to the fine timing data is not greater than a preset value, determining that the use condition of the coarse timing estimation is met.
7. The air interface time alignment apparatus of claim 6, further comprising:
the data acquisition module is used for acquiring updated fine timing data when the acquisition time corresponding to the fine timing data is reached after the first alignment module performs the air interface time alignment operation based on the coarse timing data; and acquiring the updated coarse timing data when the acquisition time corresponding to the coarse timing data is reached;
the first alignment module is further configured to perform an air interface time alignment operation based on the updated fine timing data if the signal-to-noise ratio corresponding to the fine timing data is greater than a preset value; and if the signal-to-noise ratio corresponding to the fine timing data is not greater than a preset value, performing air interface time alignment operation based on the updated coarse timing data.
8. The air interface time alignment apparatus of claim 7, wherein the fine timing data and the coarse timing data are both acquired periodically.
9. A storage medium, comprising a stored program, wherein when the program runs, a device in which the storage medium is located is controlled to execute the air interface time alignment method according to any one of claims 1 to 4.
10. An electronic device, comprising: a memory and a processor;
wherein the memory is used for storing programs;
a processor calls a program and is configured to perform the air interface time alignment method of any of claims 1-4.
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