CN112235219B - Timing synchronization detection method and device - Google Patents
Timing synchronization detection method and device Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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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
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- H04L27/2647—Arrangements specific to the receiver only
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- H04L27/2662—Symbol synchronisation
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
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Abstract
The embodiment of the application discloses a method and a device for timing synchronization detection, wherein the method comprises the following steps: selecting a first temperature compensation curve, wherein the first temperature compensation curve is an initial temperature compensation curve of the terminal equipment, adjusting a first frequency of a first cell to be a second frequency based on the first temperature compensation curve and a first temperature, the first temperature is a current temperature of a crystal used by the terminal equipment, and primary synchronization position detection is carried out based on the second frequency. According to the method and the device, the frequency of the main synchronization position detection is adjusted through the temperature compensation curve, so that the frequency deviation correction times can be reduced, the memory overhead is reduced, and the power consumption is reduced.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a timing synchronization detection method and apparatus.
Background
In a Long Term Evolution (LTE) system, a Primary Synchronization Signal (PSS) is used for symbol timing Synchronization, and a Secondary Synchronization Signal (SSS) is used for a physical layer cell identification group
The detection of the PSS, the detection of the Cyclic Prefix (CP) type, the detection of the 10ms radio frame header, and the frequency offset estimation by using the phase difference between the PSS signal and the SSS signal. At present, the influence of frequency deviation on symbol timing synchronization is mainly reduced through pre-frequency deviation correction, but when the initial frequency deviation of timing synchronization detection is large, multiple pre-frequency deviation correction attempts are required. In a weak signal scenario, a large amount of storage overhead is required to accumulate the relevant power values of the frequency offset branches to improve the detection success rate of timing synchronization, and a large amount of power consumption is required to be consumed for calculating the relevant power values of the frequency offset branches.
Disclosure of Invention
The embodiment of the application provides a timing synchronization detection method and device, the frequency of main synchronization position detection is adjusted through a temperature compensation curve, and the frequency deviation correction times can be reduced, so that the memory overhead is reduced, and the power consumption is reduced.
In a first aspect, an embodiment of the present application provides a timing synchronization detection method, which is applied to a terminal device, and the method includes:
selecting a first temperature compensation curve, wherein the first temperature compensation curve is an initial temperature compensation curve of the terminal equipment;
adjusting a first frequency of a first cell to a second frequency based on the first temperature compensation curve and a first temperature, wherein the first temperature is a current temperature of a crystal used by the terminal equipment;
and performing primary synchronization position detection based on the second frequency.
In a second aspect, an embodiment of the present application provides a timing synchronization detection apparatus, which is applied to a terminal device, and the apparatus includes:
the terminal equipment comprises a selecting unit, a calculating unit and a judging unit, wherein the selecting unit is used for selecting a first temperature compensation curve, and the first temperature compensation curve is an initial temperature compensation curve of the terminal equipment;
an adjusting unit, configured to adjust a first frequency of a first cell to a second frequency based on the first temperature compensation curve and a first temperature, where the first temperature is a current temperature of a crystal used by the terminal device;
and the detection unit is used for detecting the primary synchronization position based on the second frequency.
In a third aspect, an embodiment of the present application provides a terminal device, where the terminal device includes a processor, a memory, a communication interface, and one or more programs, where the one or more programs are stored in the memory and configured to be executed by the processor, and the program includes instructions for performing some or all of the steps described in the method of the first aspect.
In a fourth aspect, the present application provides a computer-readable storage medium storing a computer program for electronic data exchange, wherein the computer program causes a computer to perform some or all of the steps described in the method of the first aspect.
In a fifth aspect, the present application provides a computer program product, where the computer program product includes a non-transitory computer-readable storage medium storing a computer program, where the computer program is operable to cause a computer to perform some or all of the steps described in the method according to the first aspect of the present application. The computer program product may be a software installation package.
Through implementing this application embodiment, the technical scheme that this application provided selects first temperature compensation curve, first temperature compensation curve does terminal equipment's initial temperature compensation curve, based on first temperature compensation curve and first temperature, with the first frequency adjustment of first district for the second frequency, first temperature does the current temperature of the crystal that terminal equipment used, based on the second frequency carries out the primary synchronization position and detects. The frequency of the main synchronous position detection is adjusted through the temperature compensation curve, the frequency offset correction times can be reduced, so that the memory overhead and the power consumption are reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of a wireless communication system according to an embodiment of the present application;
fig. 2a is a schematic time domain position diagram of an SSS and a PSS under an FDD mode/normal CP model according to an embodiment of the present disclosure;
fig. 2b is a schematic time domain position diagram of an SSS and a PSS under an FDD mode/extended CP model according to the embodiment of the present application;
fig. 2c is a schematic time domain position diagram of SSS and PSS in a TDD mode according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a plurality of temperature profiles provided by an embodiment of the present application;
fig. 4 is a schematic flowchart of a timing synchronization detection method according to an embodiment of the present application;
fig. 5a is a block diagram of functional units of a timing synchronization detecting apparatus according to an embodiment of the present application;
FIG. 5b is a block diagram illustrating functional units of another timing synchronization detection apparatus according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
Detailed Description
The embodiments of the present application will be described below with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic diagram of a wireless communication system according to an embodiment of the present disclosure. As shown in fig. 1, the wireless communication system may include a network device and a terminal device. The network device may communicate with the terminal device through wireless communication. After a terminal device is started, a PSS is detected around several center frequency points where cells may exist, the PSS occupies 6 Physical Resource Blocks (PRBs) of a center frequency band, the repetition is performed with 5ms as a period, an intra-group cell ID of the cells can be obtained by detecting the PSS terminal, a 5ms time slot boundary is determined, the length of a cell cyclic prefix can be obtained by detecting the PSS terminal, and a duplex mode is adopted for the cells. After the 5ms time slot synchronization, the terminal searches forward SSS on the basis of PSS, the SSS consists of two random sequences, the mapping of the front half frame and the rear half frame is just opposite, and the boundary of 10ms can be determined after the two SSS are received, so that the frame synchronization is realized. Since the SSS signal carries the CELL group ID, a physical layer ID (CELL ID) can be obtained in combination with the intra-group CELL ID, and further configuration information of the downlink reference signal is obtained. Since both PSS and SSS are transmitted on 6 PRBs in the middle of the system bandwidth, symmetrically within the bandwidth, frequency synchronization can also be achieved by detecting PSS and SSS terminals. After obtaining frame synchronization, frequency synchronization and downlink reference signal configuration, the terminal further detects the downlink reference signal to obtain accurate time slot and frequency synchronization, and then reads a Broadcast Channel (PBCH), obtains system frame number, bandwidth information, physical Hybrid ARQ Indicator Channel (PHICH), configuration of the Physical Hybrid ARQ Indicator Channel (PHICH), and basic configuration information of the antenna configuration, etc., thereby implementing cell synchronization. The form and number of the network devices and the terminal devices shown in fig. 1 are only for example and do not constitute a limitation to the embodiments of the present application.
The terminal device related to the embodiment of the present application includes a device with a wireless communication function, and the terminal device may be a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in smart home (smart home), and the like. The terminal device may also be a handheld device with wireless communication functionality, a vehicle mounted device, a wearable device, a Network device or other processing device connected to a wireless modem, a terminal device in a future 5G Network or a terminal device in a future evolved Public Land Mobile Network (PLMN), etc. The terminal devices in different networks may be called different names, for example: a user equipment, an access terminal, a subscriber unit, a subscriber Station, a Mobile Station (MS), a remote Station, a remote terminal, a Mobile device, a user terminal, a Wireless communication device, a user agent or a user equipment, a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) Station, a Personal Digital Assistant (PDA), a terminal device in a 5G network or a future evolution network, etc., which are not limited in this embodiment.
In the case of the LTE system, it is,
in the LTE system, a Physical-layer cell identity (PCI) of each cell corresponds to a PSS and an SSS, and a PCI can be represented as:
there are 504 PCI groups
(value 0-167), each group contains three
(value 0-2).
An ID, which may be considered to be the site of a base station, may be referred to as the SSS number,
the PSS sequence may be used to indicate intra-group cell ID identification, which may be seen as the ID of the sector corresponding to the base station. There are three root sequences for PSS, which correspond to cells in three groups, and they may be referred to as PSS numbers, SSS sequences to indicate group identification, and 168 SSS to indicate its cell ID group, which may be referred to as SSS numbers.
For Frequency-Division Duplex (FDD)/normal Cyclic Prefix (CP) mode, the SSS symbols occur in the 6 th Orthogonal Frequency Division Multiplexing (OFDM) symbol of subframe 0 and subframe 5, and the PSS occurs in the 7 th OFDM symbol of subframe 0 and subframe 5, as shown in fig. 2 a. For FDD/extended CP mode, SSS symbols occur in the 5 th OFDM symbol of subframe 0 and subframe 5, and PSS occurs in the 6 th OFDM symbol of subframe 0 and subframe 5, as shown in fig. 2 b. For Time-division Duplex (TDD) mode, whether normal CP mode or extended CP mode, SSS symbols occur on the last OFDM of subframe 0 and subframe 5, and PSS occurs on the 3 rd OFDM symbol of subframe 1 and subframe 7, as shown in fig. 2 c. And the terminal equipment carries out downlink synchronization through the PSS and the SSS.
Currently, symbol timing synchronization is mainly performed by using PSS and symbol synchronization is mainly performed by using SSS
The detection of the PSS, the detection of the CP type and the detection of the 10ms wireless frame head utilize the phase difference between the PSS signal and the SSS signal to carry out frequency offset estimation, and reduce the influence of frequency offset on symbol timing synchronization through pre-frequency offset correction and segment correlation.
For a low-cost radio frequency crystal, the frequency deviation is generally about + -10PPM, for an LTE system with a carrier frequency of 2.6GHz, the initial maximum frequency deviation of the crystal oscillator is 26kHz, according to the temperature curve diagram of the crystal shown in fig. 3, the abscissa is temperature, and the ordinate is PPM value. In high-temperature and low-temperature scenes, the frequency deviation even reaches + -15ppm, and for the carrier frequency of 2.6GHz, the initial frequency deviation reaches + -40KHz at most. Therefore, when the initial frequency offset of the timing synchronization detection is large, multiple pre-frequency offset correction attempts are required. In a weak signal scenario, a large amount of storage overhead is required to accumulate the relevant power values of the frequency deviation branches to improve the detection success rate of timing synchronization, and a large amount of power consumption is required to be consumed for calculating the relevant power values of the frequency deviation branches.
In order to solve the above problems, the present application provides a timing synchronization detection method, when a terminal device is powered on, a frequency of a current radio frequency crystal is calibrated according to a selected temperature compensation curve, so that a frequency deviation of the terminal device at an initial start is controlled within a smaller range, thereby reducing frequency offset correction times, reducing memory overhead, and reducing power consumption.
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
Referring to fig. 4, fig. 4 is a flowchart illustrating a timing synchronization detection method according to an embodiment of the present application, which is applied to the wireless communication system shown in fig. 1. As shown in fig. 4, the method includes the following steps.
S410, selecting a first temperature compensation curve, wherein the first temperature compensation curve is an initial temperature compensation curve of the terminal equipment.
In practical application, when the terminal device is started, a temperature compensation curve needs to be selected as a default temperature compensation curve for starting. The terminal device may pre-store a plurality of temperature compensation curves in advance, each temperature compensation curve including an upper inflection point and a lower inflection point, as shown in fig. 3. In order to ensure that the selected first temperature compensation curve can represent most of the radio frequency crystals as much as possible, the number of the temperature compensation curves prestored by the terminal device should be greater than or equal to a first value, which may be determined according to an actual application scenario, wherein the first value may be 30, 50, 80, 100, 120, and the like.
Further, in order to avoid an excessively large initial frequency offset of the cell search, a temperature compensation curve close to the middle may be selected from the multiple temperature compensation curves as a default temperature compensation curve for the terminal device to start up for the first time, that is, a first temperature compensation curve.
In the temperature compensation curve, the frequency deviation is determined according to the temperature of the radio frequency crystal, the frequency errors of the crystal (TSX) of the temperature sensitive resistor at different temperatures can be calculated by using third-order polynomial piecewise fitting, and the calculation formula of the TSX frequency deviation can be expressed as follows:
F(T)＝C3*(T-T0) 3 +C2*(T-T0) 2 +C1(T-T0)+C0
wherein C0, C1, C2, and C3 are TSX frequency offset coefficients, T0 is a defined temperature threshold, and T0 may be 30.5 degrees. In some possible examples, the value of T0 may be set according to an actual application scenario. The embodiment of the present application does not limit this.
And S420, adjusting the first frequency of the first cell to be a second frequency based on the first temperature compensation curve and the first temperature, wherein the first temperature is the current temperature of the crystal used by the terminal equipment.
In the embodiment of the application, before cell search is performed, temperature compensation can be performed for one time by using the first temperature compensation curve according to the temperature of the current radio frequency crystal, that is, the frequency of cell search is calibrated, so that the frequency deviation of initial startup of the terminal device can be controlled within a smaller range within a certain temperature range. For example, the PPM value can be controlled within 7.5 after one temperature compensation within the [0,50] degree of FIG. 3.
Specifically, before the terminal device performs cell search, the terminal device obtains a first temperature, finds out a PPM value corresponding to the first temperature through a first temperature compensation curve, and adjusts a first frequency in a first cell to a second frequency according to the PPM value corresponding to the first temperature, where the first cell is a cell to be subjected to cell search, and the first frequency is a center frequency point to be subjected to cell search.
And S430, detecting the primary synchronization position based on the second frequency.
After the frequency deviation of the initial start-up of the terminal equipment can be controlled within a smaller range, the PSS is detected around the second frequency point of the first cell to obtain the primary synchronization position and the primary synchronization position
Optionally, in the step S430, the detecting the primary synchronization position based on the second frequency further includes the following steps:
s31, receiving N first time domain signals, wherein the first time domain signals are time domain signals of a continuous primary synchronization signal PSS in a period corresponding to a second frequency, and N is a positive integer.
The terminal device continuously receives first time domain signals of N first durations for primary synchronization position detection, where the first duration may be a first period plus one OFDM symbol, the first period may be 5ms, 10ms, 15ms, 20ms, and the like, and a specific value of the first period may be set according to an actual application scenario. And performing low-pass filtering and down-sampling on the received N first time domain signals respectively, wherein data of each first time domain signal after the low-pass filtering and the down-sampling is r (N), the sampling frequency of a baseband signal can be 30.72MHz, and the down-sampling factor can be 16, 32 and the like.
S32, calculating a first correlation power value sequence of the N first time domain signals and a first Received Signal Strength Indication (RSSI) value of the N first time domain signals.
After obtaining N data r (N), respectively performing frequency offset correction on the N data r (N), and then respectively performing cyclic shift correlation with a pre-stored local master synchronization signal, thereby obtaining a correlation power value sequence of each first time domain signal
Specifically, performing frequency offset correction on the data r (n) may be expressed as
The freqOff (f) o ) Is f at o Frequency offset value, f, corresponding to frequency offset branch o ＝0,1,...,N f Said N is f And the number of the frequency deviation branches is preset, and the NFFT is the number of the long points of the sliding window. The cyclic shift correlation with the local primary synchronization signal can be expressed as
Wherein the fft () is a Fourier transform, the ift () is an inverse Fourier transform, the conj () is a conjugate, the PSS p Is the local master synchronization signal. Calculating the correlation power value sequence of the first time domain signal may be expressed as:
wherein calculating the first RSSI value of the first time domain signal can be expressed as
And S33, calculating a first peak-to-average power ratio based on the N first correlation power value sequences and the N first RSSI values.
Wherein the calculating a first peak-to-average power ratio based on the N first sequences of correlation power values and the N first RSSI values comprises:
accumulating the N first correlation power value sequences to obtain a second correlation power value sequence, and accumulating the N first RSSI values to obtain a second RSSI value; acquiring M position nodes based on the second correlation power value sequence and the second RSSI value, wherein M is a positive integer; calculating the first peak-to-average power ratio for the M location nodes.
Specifically, after calculating the correlation power value sequence of the N first time domain signals and the first RSSI values of the N first time domain signals, the correlation power sequence of each first time domain signal is calculated
Accumulating to obtain related power array
And accumulating the N first RSSI values RSSI (k) to obtain the RSSI values. For each one
Corresponding correlated power array of each frequency offset branch
Performing point-by-point RSSI value normalization, then from each
Searching M distinguishable position nodes with strongest normalized peak power in each corresponding frequency deviation branch
i =0,1, M-1, the location node may be represented as the location of the PSS. Final calculation of position node
Peak to average power ratio of
The location node
Peak to average power ratio of
Can pass through the location node
The ratio of the peak of (a) to the average peak of the nearby location nodes is calculated.
And S34, determining the detection result of the primary synchronization position based on the first peak-to-average power ratio.
Optionally, the determining, based on the first peak-to-average power ratio, a result of detecting a primary synchronization position includes:
comparing the first peak-to-average power ratio for the M location nodes to a first threshold; if the first peak-to-average power ratio of the ith position node is larger than the first threshold, determining that the ith position node is an effective position node, wherein i is a positive integer less than or equal to M.
Specifically, the first peak-to-average ratio for all position nodes
Performing validity judgment, if the first peak-to-average power ratio of the ith position node
Greater than a first threshold AbTh s Then, the detected location node is considered as a valid node, and the location node can be used as the PSS location for timing synchronization.
In the embodiment of the application, N in M position nodes dec The first peak-to-average ratio of the position node is less than the first threshold if N dec >If not, ending the primary synchronization position detection of the first frequency; if N is present dec =0, and when the number N of the received first time domain signals is less than the preset maximum number of the first time domain signals, continuing to receive the first time domain signals to perform primary synchronization position detection; if N is present dec =0, and when the number N of the received first time domain signals is equal to the preset maximum number of the first time domain signals, the primary synchronization position detection of the first frequency is ended, and the timing synchronization detection failure is displayed.
In a possible embodiment, the method further comprises: acquiring a second time domain signal based on the ith position node, wherein the second time domain signal is a time domain signal of an auxiliary synchronization signal SSS corresponding to a second frequency; calculating a second peak-to-average power ratio based on the second time domain signal; and if the second peak-to-average power ratio is greater than or equal to a second threshold, determining the first cell as a target cell.
In practical application, the terminal equipment can search forward the SSS on the basis of the PSS position to detect the physical layer cell identification group
Cell CP type and cell 10ms radio frame header position.
Specifically, an SSS time domain signal is received according to a detected PSS synchronization position, i.e., an ith position node. SSS signal carries
Bonding of
A cell ID may be determined. The SSS is composed of two random sequences, and mapping of front and rear half frames is opposite, so that the positions of 10ms wireless frame headers can be determined when the two SSSs are received, and frame synchronization is realized. And performing cyclic shift correlation on the second time domain signal and a pre-stored local auxiliary synchronization signal to obtain a correlation power value sequence of the second time domain signal. Then, according to the correlation power value sequence, the peak-to-average ratio PeakAve of the second time domain signal is calculated id The peak-to-average ratio PeakAve id It may be determined whether the first cell is valid. When the peak-to-average ratio PeakAve id Greater than or equal to a second threshold Th sss In this case, it indicates that the first cell is valid, and the Master Information Block (MIB) and System Information Block 1 (System Info) of the cell can be performedSpecification Block 1, SIB 1), minimum system information (Minimum SI) read.
In a possible embodiment, the method further comprises: if the second peak-to-average power ratio is smaller than or equal to the second threshold and the first temperature is within a first temperature range, ending the primary synchronization position detection of the second frequency, wherein the first temperature range is a temperature range in which the PPM value corresponding to the first temperature does not exceed the primary synchronization position detection;
if the second peak-to-average power ratio is smaller than the second threshold and the first temperature exceeds the first temperature range, acquiring a maximum PPM value in the second temperature range;
and adjusting the second frequency to a third frequency based on the maximum PPM value and a first PPM value, wherein the first PPM value is a PPM value supported by PSS timing synchronization detection, and the second temperature range is an environment temperature range supported by the terminal equipment.
Specifically, when the peak-to-average ratio PeakAve id Less than a second threshold Th sss When it is, it indicates that the first cell is not valid. If the current temperature of the radio frequency crystal is in the first temperature range [ T1, T2 ]]If so, ending the detection of the first frequency and continuing the cell search of the next frequency; if the temperature of the current radio frequency crystal exceeds the first temperature range [ T1, T2 ]]In time, according to a plurality of temperature compensation curves stored in the terminal equipment, acquiring the maximum PPM value corresponding to the first temperature max PPM value supported by PSS timing synchronization detection ts Respectively carrying out +/- (PPM) on the current frequency point max -PPM ts )*Freq c And after the frequency offset is adjusted, cell search is carried out on the frequency points again.
In a possible embodiment, the method further comprises: adjusting the second frequency or the third frequency to a fourth frequency based on the ith location node.
In the embodiment of the present application, after performing timing synchronization detection, a phase difference between a PSS time domain signal and an SSS time domain signal of a cell may be detected to perform frequency offset fine estimation on the second frequency or the third frequency. The fine frequency offset estimation can be expressed as: freq (total number of bits) est And = (= (15khz × 2048/factor)/(2 pi × diff) · arctan (Phase), where diff is a time-domain spacing between the PSS and SSS time-domain signals, factor is a down-sampling factor, and Phase is a Phase difference between the PSS and SSS time-domain signals.
In a possible embodiment, the method further comprises: after the terminal equipment is registered to the first cell, acquiring the SINR and the frequency offset estimation value of the first cell; if the SINR is larger than a third threshold within the first duration, calculating a second PPM value based on the frequency offset estimation value; determining a second temperature compensation curve based on the second PPM value and the first temperature.
After the terminal device completes network residence, the PPM value can be calculated according to the estimated frequency deviation value of the serving cell. And then calculating a PPM difference deltaPPM corresponding to each temperature compensation curve at the current lower temperature according to the temperature of the current radio frequency crystal, and finally selecting the temperature compensation curve with the minimum deltaPPM as the optimal temperature compensation curve of the current crystal, namely a second temperature compensation curve.
Optionally, the determining a second temperature compensation curve based on the second PPM value and the first temperature includes:
acquiring K third PPM values corresponding to the first temperature based on K temperature compensation curves; calculating the difference values of the K third PPM values and the second PPM values to obtain K difference values; and determining a temperature compensation curve corresponding to the first difference as the second temperature compensation curve based on the difference, wherein the first difference is the difference with the minimum absolute value in the K differences.
Specifically, after registering in the first cell, the terminal device obtains a Signal to Interference plus Noise Ratio (SINR) of the first cell and a frequency offset estimation value, where the frequency offset estimation value includes a difference between the second frequency and the first frequency, a difference between the third frequency and the second frequency, a difference between the fourth frequency and the third frequency, or a sum of differences between the fourth frequency and the second frequency. If the SINR is greater than the third threshold in the second duration and the C0 of the first temperature compensation curve is not changed within a certain continuous time (which may be set according to specific scenario needs, for example, 24 h), the PPM value is calculated according to the estimated frequency offset value of the first cell. And then according to the first temperature, calculating deltaPPM corresponding to the first temperature under each temperature compensation curve, and selecting the temperature compensation curve with the minimum deltaPPM as a second temperature compensation curve.
It should be noted that the first threshold, the second threshold, and the third threshold may be set according to an actual application scenario, which is not limited in this application embodiment.
It can be seen that, the application provides a timing synchronization detection method, a first temperature compensation curve is selected, the first temperature compensation curve is an initial temperature compensation curve of a terminal device, a first frequency of a first cell is adjusted to a second frequency based on the first temperature compensation curve and a first temperature, the first temperature is a current temperature of a crystal used by the terminal device, and main synchronization position detection is performed based on the second frequency. According to the method and the device, the frequency of the main synchronization position detection is adjusted through the temperature compensation curve, so that the frequency deviation correction times can be reduced, the memory overhead is reduced, and the power consumption is reduced.
The above description has introduced the solution of the embodiment of the present application mainly from the perspective of the method-side implementation process. It is understood that the network device includes hardware structures and/or software modules for performing the functions in order to realize the functions. Those of skill in the art will readily appreciate that the present application is capable of hardware or a combination of hardware and computer software implementing the various illustrative elements and algorithm steps described in connection with the embodiments provided herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
Referring to fig. 5a, fig. 5a is a block diagram of functional units of a timing synchronization detecting apparatus 500 according to an embodiment of the present application, where the apparatus 500 is applied to a terminal device, and the apparatus 500 includes: a selecting unit 510, an adjusting unit 520 and a detecting unit 530, wherein,
a selecting unit 510, configured to select a first temperature compensation curve, where the first temperature compensation curve is an initial temperature compensation curve of the terminal device;
an adjusting unit 520, configured to adjust a first frequency of a first cell to a second frequency based on the first temperature compensation curve and a first temperature, where the first temperature is a current temperature of a crystal used by the terminal device;
a detecting unit 530, configured to perform primary synchronization position detection based on the second frequency.
Optionally, the detecting unit 530 is specifically configured to: receiving N first time domain signals, wherein the first time domain signals are time domain signals of continuous primary synchronization signals PSS in a period corresponding to a second frequency, and N is a positive integer; calculating a first sequence of correlation power values for the N first time domain signals and first Received Signal Strength Indication (RSSI) values for the N first time domain signals; calculating a first peak-to-average power ratio based on the N first correlation power value sequences and the N first RSSI values; and determining the result of the primary synchronization position detection based on the first peak-to-average power ratio.
Optionally, in calculating a first peak-to-average power ratio based on the N first correlation power value sequences and the N first RSSI values, the detecting unit 530 is specifically configured to: accumulating the N first correlation power value sequences to obtain a second correlation power value sequence, and accumulating the N first RSSI values to obtain a second RSSI value; acquiring M position nodes based on the second correlation power value sequence and the second RSSI value, wherein M is a positive integer; calculating the first peak-to-average power ratio for the M location nodes.
Optionally, in terms of determining a result of detecting the primary synchronization position based on the first peak-to-average power ratio, the detecting unit 530 is specifically configured to: comparing the first peak-to-average power ratio for the M location nodes to a first threshold;
if the first peak-to-average power ratio of the ith position node is larger than the first threshold, determining that the ith position node is an effective position node, wherein i is a positive integer less than or equal to M.
Optionally, as shown in fig. 5b, the timing synchronization detecting apparatus 500 provided in the embodiment of the present application is a block diagram formed by functional units, where the apparatus 500 further includes an obtaining unit 540, a calculating unit 550, and a determining unit 560, where,
the obtaining unit 540 is configured to obtain a second time domain signal based on the ith location node, where the second time domain signal is a time domain signal of an auxiliary synchronization signal SSS corresponding to a second frequency;
the calculating unit 550 is configured to calculate a second peak-to-average power ratio based on the second time domain signal;
the determining unit 560 is configured to determine that the first cell is a target cell if the second peak-to-average power ratio is greater than or equal to a second threshold.
Optionally, the apparatus 500 further comprises an ending unit 570, wherein,
the ending unit 570 is configured to end the primary synchronization position detection of the second frequency if the second peak-to-average power ratio is smaller than or equal to the second threshold and the first temperature is within a first temperature range, where the first temperature range is a temperature range in which a PPM value corresponding to the first temperature does not exceed the detection of the primary synchronization position;
the obtaining unit 540 is further configured to obtain a maximum PPM value within the second temperature range if the second peak-to-average power ratio is smaller than the second threshold and the first temperature exceeds the first temperature range;
the adjusting unit 520 is further configured to adjust the second frequency to a third frequency based on the maximum PPM value and a first PPM value, where the first PPM value is a PPM value supported by PSS timing synchronization detection, and the second temperature range is an environment temperature range supported by the terminal device.
Optionally, the adjusting unit 520 is further configured to: adjusting the second frequency or the third frequency to a fourth frequency based on the ith location node.
Optionally, the obtaining unit 540 is further configured to: after the terminal equipment is registered to the first cell, acquiring the SINR and the frequency offset estimation value of the first cell;
the computing unit 550 is further configured to: if the SINR is larger than a third threshold within the first duration, calculating a second PPM value based on the frequency offset estimation value;
the determining unit 560 is further configured to: determining a second temperature compensation curve based on the second PPM value and the first temperature.
Optionally, in terms of determining a second temperature compensation curve based on the second PPM value and the first temperature, the determining unit 560 is specifically configured to: acquiring K third PPM values corresponding to the first temperature based on K temperature compensation curves; calculating the difference values of the K third PPM values and the second PPM values to obtain K difference values; and determining a temperature compensation curve corresponding to the first difference as the second temperature compensation curve based on the difference, wherein the first difference is the difference with the minimum absolute value in the K differences.
It should be appreciated that the apparatus 500 herein is embodied in the form of a functional unit. The term unit herein may refer to an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (e.g., a shared, dedicated, or group processor), and memory that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable components that support the described functionality. In an optional example, it may be understood by those skilled in the art that the apparatus 500 may be specifically a terminal device in the foregoing embodiment, and the apparatus 500 may be configured to execute each procedure and/or step corresponding to the terminal device in the foregoing method embodiment, and in order to avoid repetition, details are not described here again.
The apparatus 500 of each of the above schemes has a function of implementing corresponding steps executed by the terminal device in the above method; the functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software comprises one or more modules corresponding to the functions; for example, the obtaining unit 540 may be replaced by a processor, and perform the transceiving operation and the related processing operation in each method embodiment, respectively.
In an embodiment of the present application, the apparatus 500 may also be a chip or a chip system, for example: system on chip (SoC). Correspondingly, the detection unit may be a detection circuit of the chip, and is not limited herein.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present application, where the terminal device includes: one or more processors, one or more memories, one or more communication interfaces, and one or more programs; the one or more programs are stored in the memory and configured to be executed by the one or more processors.
The program includes instructions for performing the steps of:
selecting a first temperature compensation curve, wherein the first temperature compensation curve is an initial temperature compensation curve of the terminal equipment;
adjusting a first frequency of a first cell to a second frequency based on the first temperature compensation curve and a first temperature, wherein the first temperature is a current temperature of a crystal used by the terminal equipment;
and performing primary synchronization position detection based on the second frequency.
All relevant contents of each scene related to the method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.
It will be appreciated that the memory described above may include both read-only memory and random access memory, and provides instructions and data to the processor. The portion of memory may also include non-volatile random access memory. For example, the memory may also store device type information.
In the embodiment of the present application, the processor of the above apparatus may be a Central Processing Unit (CPU), and the processor may also be other general processors, digital Signal Processors (DSP), application Specific Integrated Circuits (ASIC), field Programmable Gate Arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
It is to be understood that reference to "at least one" in the embodiments of the present application means one or more, and "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.
And, unless stated to the contrary, the embodiments of the present application refer to the ordinal numbers "first", "second", etc., for distinguishing a plurality of objects, and do not limit the sequence, timing, priority, or importance of the plurality of objects. For example, the first information and the second information are different information only for distinguishing them from each other, and do not indicate a difference in the contents, priority, transmission order, importance, or the like of the two kinds of information.
In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software elements in a processor. The software elements may be located in ram, flash, rom, prom, or eprom, registers, among other storage media that are well known in the art. The storage medium is located in a memory, and a processor executes instructions in the memory and combines hardware thereof to perform the steps of the above-described method. To avoid repetition, it is not described in detail here.
Embodiments of the present application also provide a computer storage medium, wherein the computer storage medium stores a computer program for electronic data exchange, and the computer program enables a computer to execute part or all of the steps of any one of the methods as described in the above method embodiments.
Embodiments of the present application also provide a computer program product comprising a non-transitory computer readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps of any of the methods as described in the above method embodiments. The computer program product may be a software installation package.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present application is not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the application. Further, those skilled in the art will recognize that the embodiments described in this specification are preferred embodiments and that acts or modules referred to are not necessarily required for this application.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the above-described division of the units is only one type of division of logical functions, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be an electric or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present application.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit may be stored in a computer readable memory if it is implemented in the form of a software functional unit and sold or used as a stand-alone product. Based on such understanding, the technical solution of the present application may be substantially or partially contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a memory and includes several instructions for causing a computer device (which may be a personal computer, a server, or a TRP, etc.) to execute all or part of the steps of the method of the embodiments of the present application. And the aforementioned memory comprises: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable memory, which may include: flash disk, ROM, RAM, magnetic or optical disk, and the like.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understand the method and the core concept of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A timing synchronization detection method is applied to a terminal device, and comprises the following steps:
selecting a first temperature compensation curve, wherein the first temperature compensation curve is an initial temperature compensation curve of the terminal equipment;
adjusting a first frequency of a first cell to a second frequency based on the first temperature compensation curve and a first temperature, wherein the first temperature is a current temperature of a crystal used by the terminal equipment;
performing primary synchronization position detection based on the second frequency; the performing primary synchronization position detection based on the second frequency includes:
receiving N first time domain signals, wherein the first time domain signals are time domain signals of a continuous primary synchronization signal PSS in a period corresponding to a second frequency, and N is a positive integer;
calculating a first sequence of correlation power values for the N first time domain signals and first Received Signal Strength Indication (RSSI) values for the N first time domain signals;
calculating a first peak-to-average power ratio based on the N first correlation power value sequences and the N first RSSI values;
determining a result of the primary synchronization position detection based on the first peak-to-average power ratio; calculating a first peak-to-average power ratio based on the N first sequences of correlation power values and the N first RSSI values, including:
accumulating the N first correlation power value sequences to obtain a second correlation power value sequence, and accumulating the N first RSSI values to obtain a second RSSI value;
acquiring M position nodes based on the second correlation power value sequence and the second RSSI value, wherein M is a positive integer;
calculating the first peak-to-average power ratio for the M location nodes.
2. The method of claim 1, wherein determining a primary synchronization position detection result based on the first peak-to-average power ratio comprises:
comparing the first peak-to-average power ratio for the M location nodes to a first threshold;
if the first peak-to-average power ratio of the ith position node is larger than the first threshold, determining that the ith position node is an effective position node, wherein i is a positive integer smaller than or equal to M.
3. The method of claim 2, further comprising:
acquiring a second time domain signal based on the ith position node, wherein the second time domain signal is a time domain signal of an auxiliary synchronization signal SSS corresponding to a second frequency;
calculating a second peak-to-average power ratio based on the second time domain signal;
and if the second peak-to-average power ratio is greater than or equal to a second threshold, determining the first cell as a target cell.
4. The method of claim 3, further comprising:
if the second peak-to-average power ratio is smaller than or equal to the second threshold and the first temperature is within a first temperature range, ending the primary synchronization position detection of the second frequency, wherein the first temperature range is a temperature range in which the PPM value corresponding to the first temperature does not exceed the primary synchronization position detection;
if the second peak-to-average power ratio is smaller than the second threshold and the first temperature exceeds the first temperature range, acquiring a maximum PPM value in a second temperature range;
and adjusting the second frequency to a third frequency based on the maximum PPM value and a first PPM value, wherein the first PPM value is a PPM value supported by PSS timing synchronization detection, and the second temperature range is an environment temperature range supported by the terminal equipment.
5. The method according to any one of claims 2-4, further comprising:
adjusting the second frequency or the third frequency to a fourth frequency based on the ith location node.
6. The method according to any one of claims 1-4, further comprising:
after the terminal equipment is registered to the first cell, acquiring the SINR and the frequency offset estimation value of the first cell;
if the SINR is larger than a third threshold within the first duration, calculating a second PPM value based on the frequency offset estimation value;
determining a second temperature compensation curve based on the second PPM value and the first temperature.
7. The method of claim 6, wherein determining a second temperature compensation curve based on the second PPM value and the first temperature comprises:
acquiring K third PPM values corresponding to the first temperature based on K temperature compensation curves;
calculating the difference value between the K third PPM values and the second PPM value to obtain K difference values;
and determining a temperature compensation curve corresponding to a first difference value as the second temperature compensation curve based on the difference value, wherein the first difference value is the difference value with the minimum absolute value in the K difference values.
8. A timing synchronization detection apparatus, applied to a terminal device, the apparatus comprising:
the terminal equipment comprises a selecting unit, a calculating unit and a judging unit, wherein the selecting unit is used for selecting a first temperature compensation curve, and the first temperature compensation curve is an initial temperature compensation curve of the terminal equipment;
an adjusting unit, configured to adjust a first frequency of a first cell to a second frequency based on the first temperature compensation curve and a first temperature, where the first temperature is a current temperature of a crystal used by the terminal device;
a detection unit configured to perform primary synchronization position detection based on the second frequency;
performing primary synchronization position detection based on the second frequency; the performing primary synchronization position detection based on the second frequency includes:
receiving N first time domain signals, wherein the first time domain signals are time domain signals of a continuous primary synchronization signal PSS in a period corresponding to a second frequency, and N is a positive integer;
calculating a first sequence of correlation power values for the N first time domain signals and first Received Signal Strength Indication (RSSI) values for the N first time domain signals;
calculating a first peak-to-average power ratio based on the N first correlation power value sequences and the N first RSSI values;
determining a result of the primary synchronization position detection based on the first peak-to-average power ratio; the calculating a first peak-to-average power ratio based on the N first correlation power value sequences and the N first RSSI values includes:
accumulating the N first correlation power value sequences to obtain a second correlation power value sequence, and accumulating the N first RSSI values to obtain a second RSSI value;
acquiring M position nodes based on the second correlation power value sequence and the second RSSI value, wherein M is a positive integer;
calculating the first peak-to-average power ratio for the M location nodes.
9. A terminal device, characterized in that the terminal device comprises a processor, a memory, a communication interface, and one or more programs stored in the memory and configured to be executed by the processor, the programs comprising instructions for carrying out the steps in the method according to any one of claims 1-7.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for electronic data exchange, wherein the computer program causes a computer to perform the steps of the method according to any one of claims 1-7.
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